modify read log util and make a single test pass by adding blocking code

Co-authored-by: Jeffrey Warren <jeff@unterbahn.com>

.github/CODEOWNERS

@@ -0,0 +1,75 @@
+# <-- DOCS FOR THIS FILE -->
+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# @global-owner1 and @global-owner2 will be requested for
+# review when someone opens a pull request.
+# *       @global-owner1 @global-owner2
+
+# Order is important; the last matching pattern takes the most
+# precedence. When someone opens a pull request that only
+# modifies JS files, only @js-owner and not the global
+# owner(s) will be requested for a review.
+# *.js    @js-owner
+
+# You can also use email addresses if you prefer. They'll be
+# used to look up users just like we do for commit author
+# emails.
+# *.go docs@example.com
+
+# In this example, @doctocat owns any files in the build/logs
+# directory at the root of the repository and any of its
+# subdirectories.
+# /build/logs/ @doctocat
+
+# The `docs/*` pattern will match files like
+# `docs/getting-started.md` but not further nested files like
+# `docs/build-app/troubleshooting.md`.
+# docs/*  docs@example.com
+
+# In this example, @octocat owns any file in an apps directory
+# anywhere in your repository.
+# apps/ @octocat
+
+# In this example, @doctocat owns any file in the `/docs`
+# directory in the root of your repository.
+# /docs/ @doctocat
+# <-- /DOCS FOR THIS FILE -->
+
+# <-- COMMON TO ALL MAINTAINERS -->
+/*.json @publiclab/is-maintainers
+/*.md @publiclab/is-maintainers
+/*.lock @ubliclab/is-maintainers
+/Gruntfile.js @publiclab/is-maintainers
+/.github/ @publiclab/is-maintainers
+/scripts/ @publiclab/is-maintainers
+# <-- /COMMON TO ALL MAINTAINERS -->
+
+# <-- SPECIFIC MAINTAINERS -->
+/index.js @publiclab/is-cli-maintainers
+/src/cli/ @publiclab/is-cli-maintainers
+/src/CliUtils.js @publiclab/is-cli-maintainers
+
+/src/*.js @publiclab/is-core-maintainers
+/src/*.json @publiclab/is-core-maintainers
+/src/util/ @publiclab/is-core-maintainers
+/test/core/* @publiclab/is-core-maintainers
+
+/src/modules/ @publiclab/is-module-maintainers
+/docs/ @publiclab/is-module-maintainers
+
+/test/ @publiclab/is-tests-maintainers
+/jest* @publiclab/is-tests-maintainers
+/eslint* @publiclab/is-tests-maintainers
+/travis* @publiclab/is-tests-maintainers
+.travis.yml @publiclab/is-tests-maintainers
+.gitpod* @publiclab/is-tests-maintainers
+/gitpod* @publiclab/is-tests-maintainers
+
+/examples/ @publiclab/is-ui-maintainers
+/icons/ @publiclab/is-ui-maintainers
+/test/ui-2/test/* @publiclab/is-ui-maintainers
+/test/ui/spec/* @publiclab/is-ui-maintainers
+# <-- /SPECIFIC MAINTAINERS -->

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,3 +1,10 @@
+---
+name: Bug report 🐞
+about: Help us identify and fix a bug!
+title: ''
+labels: bug
+---
+
 ### Please describe the problem (or idea)
 
 > What happened just before the problem occurred? Or what problem could this idea solve?
@@ -10,13 +17,13 @@
 
 ### Please show us where to look
 
-https://beta.sequencer.publiclab.org
+Paste in a full URL, starting with:
 
+> https://beta.sequencer.publiclab.org/
 
-### What's your PublicLab.org username?
+If you can share a screenshot or a GIF that is EXTRA helpful! 💖
-
-> This can help us diagnose the issue:
 
+If you can see a version number in the upper right, please note that!
 
 
 ### Browser, version, and operating system

.github/ISSUE_TEMPLATE/release_workflow.md

@@ -0,0 +1,39 @@
+---
+name: New release checklist ✅
+about: Coordinate steps to publish a new release
+title: 'Checklist and coordination for v0.0.0 major/minor/patch release'
+labels: release
+assignees: '@publiclab/is-maintainers'
+---
+
+This template guides us through the steps of creating a new release, based on conversation and testing in [#1692](https://github.com/publiclab/image-sequencer/issues/1692).
+
+Discuss with @publiclab/is-maintainers if anything is ambiguous!
+
+<!-- NOTE: Change v0.0.0 to the appropriate release version -->
+
+* [x] open an issue using the "release" template with this checklist with title `Checklist and coordination for v0.0.0 major/minor/patch release` (see [semantic versioning](https://docs.npmjs.com/about-semantic-versioning/))
+* [ ] create a release [project](https://github.com/publiclab/image-sequencer/projects) from [this template](https://github.com/publiclab/image-sequencer/projects/5). You can copy a project from its menu.
+* [ ] compile release notes below from corresponding [release project](https://github.com/publiclab/image-sequencer/projects).
+* [ ] update version number in `examples/sw.js` (ex #1734) and `package.json` (ex #1695)
+* [ ] finalize and merge to `main` branch (freeze merges to `main` branch until next step)
+* [ ] merge, build and publish `/dist/` files to `stable` (merges to `main` branch can resume for next release)
+* [ ] create a release on GitHub and use features description + release notes from below
+* [ ] tag version number branch (i.e. `v0.0.0`)
+* [ ] publish tagged branch to `npm`
+* [ ] publish to live Github pages [demo](https://sequencer.publiclab.org) (with [bash script](https://github.com/publiclab/image-sequencer/pull/1703) from `/scripts/update-demo`) (from within GitPod works well)
+* [ ] move anything necessary to next release project, i.e. <!-- Update this link -->https://github.com/publiclab/image-sequencer/projects/[insert project number]
+* [ ] close this issue!
+
+Noting we're now in this process in https://github.com/publiclab/image-sequencer/pull/1695 for `v3.6.0`.
+
+****
+
+### Release notes
+Compile and edit release notes below, to be copied into the release description.
+
+#### Added
+
+#### Fixed
+
+#### Changed

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,15 +2,15 @@ Fixes #0000  (<=== Replace `0000` with the Issue Number)
 
 Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!
 
-* [ ] tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with `npm test`
+* [ ] tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with `npm run test-all`
 * [ ] code is in uniquely-named feature branch and has no merge conflicts
 * [ ] PR is descriptively titled
 * [ ] ask `@publiclab/is-reviewers` for help, in a comment below
-
+* [ ] Insert-step functionality is working correct as expected.
 > We're happy to help you get this ready -- don't be afraid to ask for help, and **don't be discouraged** if your tests fail at first!
 
 If tests do fail, click on the red `X` to learn why by reading the logs.
 
 Please be sure you've reviewed our contribution guidelines at https://publiclab.org/contributing-to-public-lab-software
-
+Please make sure to get at least two reviews before asking for merging the PR as that would make the PR more reliable on our part
 Thanks!

.github/config.yml

@@ -4,22 +4,27 @@
 
 # Comment to be posted to on first time issues
 newIssueWelcomeComment: |
-  Thanks for opening your first issue here! Please follow the issue template to help us help you 👍🎉😄
+ Thanks for opening your first issue here! This space is [protected by our Code of Conduct](https://publiclab.org/conduct) - and we're here to help.
-  If you have screenshots to share demonstrating the issue, that's really helpful! 📸 You can [make a gif](https://www.cockos.com/licecap/) too!
+ Please follow the issue template to help us help you 👍🎉😄
+ If you have screenshots to share demonstrating the issue, that's really helpful! 📸 You can [make a gif](https://www.cockos.com/licecap/) too!
+ Don't forget to join our [PublicLab Gitter channel](https://gitter.im/publiclab/publiclab) and our [ImageSequencer Gitter Channel](https://gitter.im/publiclab/image-sequencer) for some brainstorming discussions. 
 # Configuration for new-pr-welcome - https://github.com/behaviorbot/new-pr-welcome
 
 # Comment to be posted to on PRs from first time contributors in your repository
 newPRWelcomeComment: |
- Thanks for opening this pull request!
+ Thanks for opening this pull request! This space is [protected by our Code of Conduct](https://publiclab.org/conduct).
  There may be some errors, **but don't worry!** We're here to help! 👍🎉😄
+ Also please refer (https://github.com/publiclab/image-sequencer/blob/main/README.md) for installation help.
 # Configuration for first-pr-merge - https://github.com/behaviorbot/first-pr-merge
 
 # Comment to be posted to on pull requests merged by a first time user
 firstPRMergeComment: |
  Congrats on merging your first pull request! 🙌🎉⚡️ 
- Your code will be published to https://beta.sequencer.publiclab.org in a day or two. 
+ Your code will be published to https://beta.sequencer.publiclab.org in a day or two. Please test out your work on this testing server and report back with a comment that all has gone well!
- In the meantime, can you tell us your Twitter handle so we can thank you properly?
+ In the meantime, can you tell us your Twitter handle so we can thank you properly also do join our weekly check-in to share your this week goal and the awesome work you did 😃. 
- Now that you've completed this, you can help someone else take their first step!
+ Please find the link **pinned in the issue section**
+ Now that you've completed this, you can help someone else take their first step! Try looking at this list of `first-timers-only` issues, and see if someone else is waiting for feedback, or even stuck! 😕
+ People often get stuck at the same steps, so you might be able to help someone get unstuck, or help lead them to some documentation that'd help. Reach out and be encouraging and friendly! 😄 🎉  
  See: [Public Lab's coding community!](https://code.publiclab.org)
 
 # It is recommended to include as many gifs and emojis as possible

.github/workflows/tests.yml

@@ -0,0 +1,209 @@
+name: tests
+on: [pull_request]
+jobs:
+  base-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "Base istanbul/tape node tests"
+      run: npm test
+
+  benchmark-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "Benchmark tests"
+      run: npm run benchmark
+
+  gif-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "Gif tests"
+      run: npm run gif-test
+
+  browserify-core-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - run: sudo apt-get install xvfb
+    - name: "Browserify core tests and run"
+      run: grunt tests && xvfb-run --auto-servernum npm run core-tests
+
+  jsmine-ui-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "Jasmine UI tests (mocked browser env)"
+      run: npm run test-ui
+
+  jest-ui-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "jest-puppeteer UI tests (full browser env)"
+      run: npm run test-ui-2    
+
+  cli-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "CLI tests"
+      run: npm run test-cli
+
+  grunt-build-test:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup node
+      uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+    - name: Install Dependencies
+      run: npm install
+    - name: "Grunt build test of dev environment"
+      run: grunt build
+
+## Cache NPM folder
+# cache:
+#   directories:
+#     - ~/.npm
+#     - ~/.cache

.gitpod.dockerfile

@@ -0,0 +1,63 @@
+FROM gitpod/workspace-full
+
+USER root
+RUN sudo apt-get update && apt-get install -y apt-transport-https \
+ && sudo apt-get install -y \
+    xserver-xorg-dev \
+    libxext-dev \
+    build-essential \
+    libxi-dev \
+    libglew-dev \
+    pkg-config \
+    libglu1-mesa-dev \
+    freeglut3-dev \
+    mesa-common-dev \
+    x11-apps \
+    libice6 \
+    libsm6 \
+    libxaw7 \
+    libxft2 \
+    libxmu6 \
+    libxpm4 \
+    libxt6 \
+    x11-apps \
+    xbitmaps \
+    ca-certificates \
+    fonts-liberation \
+    libappindicator3-1 \
+    libasound2 \
+    libatk-bridge2.0-0 \
+    libatk1.0-0 \
+    libc6 \
+    libcairo2 \
+    libcups2 \
+    libdbus-1-3 \
+    libexpat1 \
+    libfontconfig1 \
+    libgbm1 \
+    libgcc1 \
+    libglib2.0-0 \
+    libgtk-3-0 \
+    libnspr4 \
+    libnss3 \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libstdc++6 \
+    libx11-6 \
+    libx11-xcb1 \
+    libxcb1 \
+    libxcomposite1 \
+    libxcursor1 \
+    libxdamage1 \
+    libxext6 \
+    libxfixes3 \
+    libxi6 \
+    libxrandr2 \
+    libxrender1 \
+    libxss1 \
+    libxtst6 \
+    lsb-release \
+    wget \
+    xdg-utils \
+    xvfb \
+ && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/*

.gitpod.yml

@@ -0,0 +1,18 @@
+image:
+  file: .gitpod.dockerfile
+tasks:
+  - init: npm run setup
+    command: npm start
+ports:
+  - port: 3000
+    onOpen: open-preview
+
+github:
+  prebuilds:
+    branches: true
+    pullRequests: true
+    pullRequestsFromForks: true
+    addCheck: true
+    addComment: true
+    addBadge: false
+    addLabel: false

.travis.yml

@@ -1,8 +1,8 @@
 sudo: required
 language: node_js
 node_js:
-  - '8'
   - '10'
+  - '12'
 env:
   - CXX=g++-4.8
 before_script:
@@ -10,10 +10,24 @@ before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
-script:
+jobs:
-  - npm test
+  include:
-  - npm run test-ui
+    - name: "Base istanbul/tape node tests"
-  - grunt build
+      script: npm test
+    - name: "Benchmark tests"
+      script: npm run benchmark
+    - name: "Gif tests"
+      script: npm run gif-test
+    - name: "Browserify core tests and run"
+      script: grunt tests && npm run core-tests
+    - name: "Jasmine UI tests (mocked browser env)"
+      script: npm run test-ui
+    - name: "jest-puppeteer UI tests (full browser env)"
+      script: npm run test-ui-2    
+    - name: "CLI tests"
+      script: npm run test-cli
+    - name: "Grunt build test of dev environment"
+      script: grunt build
 after_success:
   - bash <(curl -s https://codecov.io/bash)
 after_script:

CODE_OF_CONDUCT.md

@@ -1,114 +1,11 @@
-This document was copied from its home at https://publiclab.org/conduct on October 12, 2017. See that page if you would like to submit your concerns in a safe, completely anonymous way, and to learn more about this document. 
-
-****
-
 # Public Lab Code of Conduct 
 
-_Public Lab, PO Box 426113, Cambridge, MA 02142_
+_Public Lab, 55 Cromwell Street, 1C, Providence, RI 02907_
 
-We are coming together with an intent to care for ourselves and one another. We want to nurture a compassionate democratic culture where responsibility is shared. We -- visitors, community members, community moderators, staff, organizers, sponsors, and all others -- hold ourselves accountable to the same values regardless of position or experience. For this to work for everybody, individual decisions will not be allowed to run counter to the welfare of other people. This community aspires to be a respectful place both during online and in-person interactions so that all people are able to fully participate with their dignity intact. This document is a piece of the culture we're creating.
+We are coming together with an intent to care for ourselves and one another as we produce knowledge in pursuit of environmental justice. For this to work for everybody, individual decisions will not be allowed to run counter to the welfare of other people. We—visitors, community members, community moderators, staff, organizers, sponsors, and all others—hold ourselves accountable to the same values regardless of position or experience. This community aspires to be a respectful place both during online and in-person interactions so that all people are able to fully participate with their dignity intact. This document is a piece of the culture we're creating.
 
+This code of conduct applies to all spaces managed by the Public Lab community and non-profit, both online and in person. It provides a clear set of practical guidelines for events led by organizers and community members, multi-day events such as Barnraisings, and online venues such as the website, comment threads on software platforms, chatrooms, our mailing lists, the issue tracker, and any other forums created by Public Lab which the community uses for communication. For interactions with additional groups, see our Partnership Guidelines at https://publiclab.org/partners.
 
-This code of conduct applies to all spaces managed by the Public Lab community and non-profit, both online and in person. It was written by the Conduct Committee (formed in 2015 during Public Lab’s annual conference “The Barnraising”) and facilitated by staff to provide a clear set of practical guidelines for multi-day events such as Barnraisings, events led by organizers and community members, and online venues such as the website, comment threads on software platforms, chatrooms, our mailing lists, the issue tracker, and any other forums created by Public Lab which the community uses for communication. 
+To read the full Code of Conduct and learn how to contact the Conduct Committee or the Moderators group, see:
 
-
+https://publiclab.org/conduct
-## We come from all kinds of backgrounds
-
-Our community is best when we fully invite and include participants from a wide range of backgrounds. We specifically design spaces to be welcoming and accessible to newcomers and folks from underrepresented groups. Public Lab is dedicated to providing a harassment-free, safe, and inclusive experience for everyone, regardless of personal and professional background, gender, gender identity and expression, style of clothing, sexual orientation, dis-/ability, physical appearance, body size, race, class, age, or religion. Public Lab resists and rejects: racism, sexism, ableism, ageism, homophobia, transphobia, body shaming, religion shaming, “geekier-than-thou” shaming, education bias, the shaming of people nursing children, and the dismissal or bullying of children or adults.
-
-## We do not tolerate harassment or shaming
-
-While we operate under the assumption that all people involved with Public Lab subscribe to the basic understanding laid out above, we take these issues very seriously and think they should, in general, be taken seriously. Therefore, individuals who violate this Code both in and outside of Public Lab spaces may affect their ability to participate in Public Lab ranging from temporarily being placed into online moderation to, as a last resort, expulsion from the community. If you have any questions about our commitment to this framework and/or if you are unsure about aspects of it, email conduct@publiclab.org and we will do our best to provide clarification.
-
-## How It Works
-
-Sometimes things go wrong. When a situation is uncomfortable, hurtful, exclusionary, or upsetting, there is a problem that should be addressed. This code of conduct is an effort to maintain a safe space for everyone, and to talk about what might happen if that space is compromised. Please see additional guidelines below for community behavior on how we expect people to interact with one another. 
-
-### Two helpful groups
-
-__Conduct Committee (ConductCom)__: If at any time you experience something that you are not comfortable with, you may contact the Conduct Committee. As established during the 2015 Annual Barnraising, the following individuals are on the Conduct Committee: Klie Kliebert, Carla Green, Nick Shapiro, and Shannon Dosemagen, the executive director of the Public Lab nonprofit. 
-
-
-If you would like to have a confidential conversation, connect with ConductCom in person or email via [conduct@publiclab.org](mailto:conduct@publiclab.org). A minimum of two committee members will confer and respond as swiftly as possible. If you would prefer to speak privately with a representative of the nonprofit, please contact the executive director directly either in person or by email: [shannon@publiclab.org.](mailto:conduct@publiclab.org)
-
-
-To submit a report anonymously for review by ConductCom, go online via phone or computer to our anonymous “contact” app, located at [http://bit.ly/PLReport](http://bit.ly/PLReport). This contact app will be monitored daily at 8am CST during in-person events like Barnraisings and weekly at all other times. During multi-day in-person events hosted by the Public Lab non-profit, there will also be a physical suggestion box available. This box will be monitored throughout the event and can also be used to let us know if you need us to check on an anonymous online submission sooner.
-
-
-__Moderators Group:__ The moderators group is responsible for addressing immediate moderation issues that arise during online violations of the code over email lists and Public Lab community websites, as well as approving first-time posts and generally handling spam. Instructions on how to become a moderator, and, if you’ve been placed in moderation how to begin the process of getting out of moderation can be found at: https://publiclab.org/wiki/moderation. 
-
-****
-
-## A Culture of Empathy
-
-We begin interactions by acknowledging that we are part of a community with complementary goals. Different views are allowed to respectfully coexist in the same space. When something's happened and someone is uncomfortable, our first choice is to work through it. Endeavor to listen and appropriately adjust your behavior if someone approaches you privately with a request that you apologize or publicly requests that you stop an ongoing presentation. If someone questions your words, actions or motives, or "calls you out", hear their feedback and respond respectfully. It’s okay to not understand why something is hurtful or causes discomfort, as long as you approach it respectfully, with empathy. Repeating hurtful behavior after it has been addressed is disrespectful and is not allowed. Doing so will result in removal and subsequent banning from in-person events and being placed into moderation in online spaces. 
-
-### The first rule of engaging with others is consent
-
-During in-person gatherings, consent is important to highlight because the negotiation of consent can be subtle, and it’s easy to miss each other’s non-verbal cues, resulting in miscommunication and/or offense. During online interactions, consent can be even harder to distinguish.
-
-We make guesses or assessments of consent (willingness, welcome, invitation) all the time. Then we stay open to signs that the consent isn't there. Handshakes are a clear example of consent: someone offers a hand, and you take it if you want to shake it. A friendly smile might indicate consent to start a conversation. It might not. We learn that in the interaction. Sometimes we ask directly. We are open to making mistakes, and learning from them. The more we learn to be empathetic and see other people, the more we're able to talk about consent.
-
-Before you engage with someone on any level, be sure you have their consent. If your indications aren't being heard, you can also ask for help from other folks, especially Conduct Committee members and staff of the non-profit: "They aren't taking the hint. Will you help?" Turning a blind eye to hurtful interactions can be as bad for our community as the exchange itself. If you witness something, it's your responsibility to say something.  This is how we keep each other accountable, encourage empathy, and keep our community safe.
-
-## Guidelines for in-person community behavior
-
-
-Do | Don’t
------------ | -----------
-Respectfully share what method works best for you, while giving others space to think differently and contribute other ideas | Disparage entire groups/sets of people for their beliefs or methods
-Ask permission to take pictures of and post about others on social media (see Media Consent, above)| Upload photos, tag or mention others online without their consent 
-Speak your own narrative, from your own unique culture | Caricature the cultural expressions of groups you are not a member of
-Model inclusionary expertise - if others in the group appear to be “lost”, slow down; stop and ask for input | Present information in a way / at a level that no one else in the room can understand, with no attempt to include others in the discussion
-Create events that are all-ages appropriate | Use language that excludes youth and their experiences as vital contributors
-Give everyone a chance to talk, only interrupting if absolutely necessary - for example, Code of Conduct violations | Repeatedly disrupt a discussion
-Stop, listen and ask for clarification if someone perceives your behavior or presentation as violating the Code of Conduct | Ignore others’ request to stop potentially harmful behavior, even if it was an accident
-Cultivate a sense of humor based on other subjects, such as word play (especially puns!)  | Joke using words related to actual or insulting descriptions of people
-Use words that accurately describe the situation - For example, “The wind was ridiculously strong!” instead of “The wind was crazy!” | Use disability and mental/emotional health terminology to describe a situation metaphorically, especially if the phrasing is meant as an insult
-Only discuss someone else’s lifestyle practices if they invite you to a conversation on the topic | Make unwelcomed comments regarding a person’s lifestyle practices, including those related to food, health, parenting, relationships, and employment
-Ask someone before you hug them; keep your hands/body to yourself, even when joking, unless the other person has given verbal consent | Initiate physical contact or simulate physical contact without consent 
-Disengage and find another activity if someone did not invite you and is not engaging with you | Violate personal space by continuing your physical presence into private spaces without consent
-Exercise the right to talk about your own identity if you want to, or not if you don’t want to | Deliberately “out” any aspect of a person’s identity without their consent
-Use the pronouns people have specified for themselves | Purposely misgender someone (ie, refusing to use their correct gender pronouns) after they have told you their correct pronouns 
-
-
-## Additional guidelines for online community behavior
-
-
-Online modes of interaction involve large numbers of people without the helpful presence of gestural, expression, and tonal cues regarding consent. Because of this, respectful and self-aware online conduct is both especially important and difficult. Our community has evolved specific guidelines for online interactions. 
-
-_If someone violates these guidelines, someone from the Moderators group will place them into moderation by changing that person’s posting permission on the relevant list, on the website, or both._
-
-Our triple notification standard for moderation means a point person from the Moderators group will:
-
-1. e-mail the person directly with a brief explanation of what was violated,
-2. send a summary email to the rest of the moderators group, 
-3. if it happened on a public list (vs a website), notify the list that one of our members has been placed into moderation with a brief explanation of what is not tolerated.
-
-
-If you wish to begin the process of getting out of moderation, respond to the email sent to you from [moderators@publiclab.org](mailto:moderators@publiclab.org). The Moderators group has the option to involve ConductCom.
-
-
-Do | Don’t
--------|--------
-Stay on topic to make long threads easier to follow |Send spurious one-line responses that effectively "spam" hundreds of people and lower the overall content quality of a conversation. (Exception: expressions of appreciation and encouragement!)
-Start a new thread to help others follow along. Important if your response starts to significantly diverge from the original topic | Respond with off-topic information making it hard for the large group of readers to follow along
-Write short and literal subject lines to help the readers of the list manage the volume of communication | Humor and euphemisms in subject lines are easily misunderstood, although enthusiasm is welcome! 
-Mind your tone. We are not having this conversation in person, so it is all the more important to maintain a tone of respect | Write in aggressive tone, disrespectful tone, mocking tone, off-color tone. Note: writing in all caps is regarded as shouting
-
-## Media Consent
-
-* ALWAYS check with parents about posting anything with minors.
-* Never post the names of minors in conjunction with their photo. 
-* During multi-day events like Barnraisings most people will have signed media releases. Those who haven’t will be responsible for placing stickers on their nametags, and/or raising their hands in the moment to alert photographers to move them out of frame. 
-* For events where people have not signed blanket media release forms, the photographer is responsible for letting the room know that you are taking photos that will be posted online. Pay special attention to the presence of minors and their parent's wishes.
-
-
-## Addendum for all staff 
-
-Staff are bound by their Employment Handbook, you must reference it. Additionally:  
-
-* Direct problems that come up among community members to the Conduct Committee.
-* When organizing events, circulate access information regarding wheelchair-accessible ADA bathrooms, non-gendered bathrooms, the presence of stairs or curb ramps in the parking lot, et cetera.
-* During events that you are attending in person, solve accessibility issues by making sure attendees know where bathrooms are located and can access them by wheelchair without being obstructed by things like chairs, kites, contraptions, or cords. 
-* Watch for people feeling left out and include them.  

CONTRIBUTING.md

@@ -5,7 +5,7 @@ Happily accepting pull requests; to edit the core library, modify files in `./sr
 
 On ARM based devices, the `gl` module may require some libraries to be re-installed:
 
-`sudo apt-get install -y build-essential libxi-dev libglu1-mesa-dev libglew-dev pkg-config` -- see https://github.com/stackgl/headless-gl#ubuntudebian for more.
+`sudo apt-get install -y build-essential xserver-xorg-dev libxext-dev libxi-dev libglu1-mesa-dev libglew-dev pkg-config` -- see https://github.com/stackgl/headless-gl#ubuntudebian for more.
 
 Most contribution (we imagine) would be in the form of API-compatible modules, which need not be directly included.
 
@@ -17,6 +17,7 @@ Most contribution (we imagine) would be in the form of API-compatible modules, w
 * [Ideas](#Contribution-ideas)
 * [Grunt Tasks](#grunt-tasks)
 * [UI Helper Methods](#ui-helper-methods)
+* [Scripts](#scripts)
 
 ****
 
@@ -374,7 +375,7 @@ module.exports =
 We are now using `eslint` and `husky` to help lint and format our code each time we commit. Eslint defines coding standards and helps in cleaning up the code. To run eslint for checking errors globally or within a specific file run:
 
 ```
-npx eslint . 
+npx eslint .
 
 npx eslint <file path>
 ```
@@ -412,15 +413,15 @@ The following command is used for running the tasks: `grunt [task-name]`. Here `
 
 The method returns a scoped `jQuery` object which only searches for elements inside a given scope (a DOM element).
 
-To use the method, 
+To use the method,
 * import the `scopeSelector` and `scopeSelectorAll` methods from `lib/scopeQuery.js`
 * call the methods with scope as a parameter
-	
+
 ```js
 var scopeQuery = require('./scopeQuery');
 
 var $step = scopeQuery.scopeSelector(scope),
-    $stepAll = scopeQuery.scopeSelectorAll(scope);	
+    $stepAll = scopeQuery.scopeSelectorAll(scope);
 ```
 This will return an object with a constructor which returns a `jQuery` object (from inside the scope) but with new `elem` and `elemAll` methods.
 
@@ -433,7 +434,7 @@ This will return an object with a constructor which returns a `jQuery` object (f
 #### Example
 
 ```js
-//The scope is a div element with id=“container“ and there are three divs in it 
+//The scope is a div element with id=“container“ and there are three divs in it
 //with ids „1“, „2“, and „3“, and all of them have a „child“ class attribute
 
 var $step = require('./scopeQuery').scopeSelector(document.getElementById('container'));
@@ -458,3 +459,23 @@ The following code can be used
 $step('query').show().hide();
 $stepAll('q2').show().hide();
 ```
+
+## Scripts
+The following shell scripts are present in the `scripts/` directory.
+
+- `update-gh-pages`: This script can be used to update the `gh-pages` branch of this repo or a fork.
+ This script is not meant to be used directly as it runs in the current working directory.
+ If you run it on your primary local clone, it can **delete** the local changes. This script is made to be used in a github action
+ or in a temporary directory via another script, such as `update-demo`.
+
+  Arguments:
+  1. Repo(to use as upstream) url in the form username/repo (default: publiclab/image-sequencer) NOTE: Github only
+  2. Branch to pull from eg: main or stable (default: stable)
+  3. CNAME URL (default: none)
+  4. Set the fourth argument to anything to bypass the warning. You will have to set this argument if you want to run this script in another script without needing
+  user interaction, such as in a github action.
+
+- `update-demo`: A safe, interactive script that can be used to update the `gh-pages` branch of any image-sequencer fork.
+ This script is safe to use directly because it separately clones the repo in a temporary directory.
+
+  Arguments: None since it is a an *interactive* script, ie it asks the user for input.

Gruntfile.js

@@ -2,6 +2,7 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-browserify');
   grunt.loadNpmTasks('grunt-contrib-uglify-es');
   grunt.loadNpmTasks('grunt-browser-sync');
+  grunt.loadNpmTasks('grunt-text-replace');
 
   require('matchdep')
     .filterDev('grunt-*')
@@ -21,6 +22,11 @@ module.exports = function(grunt) {
     },
 
     browserify: {
+      options: {
+        alias: {
+          'gpu.js': './node_modules/gpu.js/src/index.js'
+        }
+      },
       core: {
         src: ['src/ImageSequencer.js'],
         dest: 'dist/image-sequencer.js'
@@ -36,6 +42,28 @@ module.exports = function(grunt) {
       produi: {
         src: ['examples/demo.js'],
         dest: 'dist/image-sequencer-ui.brow.js'
+      },
+      tests: {
+        src: ['test/core/sequencer/meta-modules.js',
+              'test/core/sequencer/image-sequencer.js',
+              'test/core/sequencer/chain.js',
+              'test/core/sequencer/replace.js',
+              'test/core/sequencer/import-export.js',
+              'test/core/sequencer/run.js',
+              'test/core/sequencer/dynamic-imports.js',
+              'test/core/util/*.js'],
+        dest: './output/core-tests.js'
+      }
+    },
+
+    replace: {
+      version: {
+        src: ['examples/sw.js'],
+        overwrite: true,
+        replacements: [{
+          from: /image-sequencer-static-v.*/g,
+          to: "image-sequencer-static-v<%= pkg.version %>';"
+        }]
       }
     },
 
@@ -69,8 +97,10 @@ module.exports = function(grunt) {
 
   /* Default (development): Watch files and build on change. */
   grunt.registerTask('default', ['watch']);
-  grunt.registerTask('build', ['browserify:core', 'browserify:ui', 'uglify:core', 'uglify:ui']);
+  grunt.registerTask('build', ['browserify:core', 'browserify:ui', 'replace:version', 'uglify:core', 'uglify:ui']);
-  grunt.registerTask('serve', ['browserify:core', 'browserify:ui', 'browserSync', 'watch']);
+  grunt.registerTask('serve', ['browserify:core', 'browserify:ui', 'replace:version', 'browserSync', 'watch']);
   grunt.registerTask('compile', ['browserify:core', 'browserify:ui']);
-  grunt.registerTask('production', ['browserify:prodcore', 'browserify:produi', 'uglify:prodcore', 'uglify:produi']);
+  grunt.registerTask('production', ['browserify:prodcore', 'browserify:produi', 'replace:version', 'uglify:prodcore', 'uglify:produi']);
+
+  grunt.registerTask('tests', ['browserify:tests']);
 };

README.md

@@ -1,13 +1,19 @@
 Image Sequencer
 ====
 
-
+[![Code of Conduct](https://img.shields.io/badge/code-of%20conduct-green.svg)](https://publiclab.org/conduct)
+[![npm version](https://badge.fury.io/js/image-sequencer.svg)](https://badge.fury.io/js/image-sequencer)
 [![Build Status](https://travis-ci.org/publiclab/image-sequencer.svg?branch=master)](https://travis-ci.org/publiclab/image-sequencer) [![Maintainability](https://api.codeclimate.com/v1/badges/5906996dd2e90aca6398/maintainability)](https://codeclimate.com/github/publiclab/image-sequencer/maintainability) [![Codecov](https://img.shields.io/codecov/c/github/publiclab/image-sequencer.svg?logo=codecov)](https://codecov.io/gh/publiclab/image-sequencer)
+[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/publiclab/image-sequencer/)
 
 - **Latest Stable Demo**: https://sequencer.publiclab.org
 - **Latest Beta Demo**: https://beta.sequencer.publiclab.org
 - **Stable Branch**: https://github.com/publiclab/image-sequencer/tree/stable/
 
+Begin running (and contributing to) this codebase immediately with [GitPod](https://gitpod.io) (this also opens the latest `main` branch code):
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/publiclab/image-sequencer)
+
 ## Why
 
 Image Sequencer is different from other image processing systems because it's _non-destructive_: instead of modifying the original image, it **creates a new image at each step in a sequence**. This is because it:
@@ -71,6 +77,12 @@ In case of a port conflict please run the following
 npm i -g http-server ; http-server -p 3000
 ```
 
+### Online one-click setup for contributing
+
+Contribute to ImageSequencer using a fully featured online development environment that will automatically: clone the repo, install the dependencies and start the webserver.
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)
+
 ### Browser
 
 Just include [image-sequencer.min.js](https://github.com/publiclab/image-sequencer/blob/stable/dist/image-sequencer.min.js) in the Head section of your web page. See the [demo here](https://sequencer.publiclab.org)!
@@ -242,7 +254,7 @@ If only one module is to be added, `modules` is simply the name of the module.
 If multiple images are to be added, `modules` is an array, which holds the names of modules
 to be added, in that particular order.
 
-optional_otions is just an optional parameter, in object form, which you might
+optional_options is just an optional parameter, in object form, which you might
 want to provide to the modules.
 
 A variety of syntaxes are supported by Image Sequencer to add multiple steps and configurations quickly for module chaining. The project supports the string syntax, designed to be compact and URL friendly, and JSON, for handling more complex sequences. This can be achieved by passing strings to `sequencer.addStep()`:
@@ -598,4 +610,17 @@ let sequencer = ImageSequencer() // also for wasm mode i.e. default mode
 
 let sequencer = ImageSequencer({useWasm:false}) //for non-wasm mode 
 
-```
+```
+
+## Experimental GIF processing support
+
+ImageSequencer currently can process GIFs but only for most of the modules. Every frame of the GIF is manipulated sequentially (parallel processing would be preferable in the future).
+The final frames are then converted back to a GIF but in the process, the time duration of each frame is lost and defaults to `0.1s`.
+
+Modules that do not work:
+1. ColorBar (Will get fixed upon fixing overlay as this is a meta module which uses overlay)
+2. FisheyeGL
+3. Overlay
+4. Blend
+5. Histogram
+6. WebGL Distort

docs/MODULES.md

@@ -8,39 +8,44 @@ List of Module Documentations
 3.  [Blend](#blend-module)
 4.  [Blur](#blur-module)
 5.  [Brightness](#brightness-module)
-6.  [Channel](#channel-module)
+6.  [Canvas-Resize](#canvas-resize-module)
-7.  [Colorbar](#colorbar-module)
+7.  [Channel](#channel-module)
-8.  [Colormap](#colormap-module)
+8.  [Colorbar](#colorbar-module)
-9.  [ColorTemperature](#color-temperature)
+9.  [Colormap](#colormap-module)
-10. [Contrast](#contrast-module)
+10. [ColorTemperature](#color-temperature)
-11. [Convolution](#convolution-module)
+11. [Contrast](#contrast-module)
-12. [Crop](#crop-module)
+12. [Convolution](#convolution-module)
-13. [DecodeQr](#decodeQr-module)
+13. [Crop](#crop-module)
-14. [Dither](#dither-module)
+14. [DecodeQr](#decodeQr-module)
-15. [DrawRectangle](#draw-rectangle-module)
+15. [Dither](#dither-module)
-16. [Dynamic](#dynamic-module)
+16. [DrawRectangle](#draw-rectangle-module)
-17. [Edge-Detect](#edge-detect-module)
+17. [Dynamic](#dynamic-module)
-18. [FisheyeGl](#fisheyeGl-module)
+18. [Edge-Detect](#edge-detect-module)
-19. [FlipImage](#flipimage-module)
+19. [Exposure](#exposure-module)
-20. [Gamma-Correction](#gamma-correction-module)
+20. [FisheyeGl](#fisheyeGl-module)
-21. [Gradient](#gradient-module)
+21. [FlipImage](#flipimage-module)
-22. [Grid-Overlay](#grid-overlay)
+22. [Gamma-Correction](#gamma-correction-module)
-23. [Histogram](#histogram-module)
+23. [Gradient](#gradient-module)
-24. [Import-image](#import-image-module)
+24. [Grid-Overlay](#grid-overlay)
-25. [Invert](#invert-module)
+25. [Histogram](#histogram-module)
-26. [MinifyImage](#minify-image)
+26. [Import-image](#import-image-module)
-27. [Ndvi](#ndvi-module)
+27. [Invert](#invert-module)
-28. [Ndvi-Colormap](#ndvi-colormap-module)
+28. [MinifyImage](#minify-image)
-29. [Overlay](#overlay-module)
+29. [Ndvi](#ndvi-module)
-30. [PaintBucket](#paint-bucket-module)
+30. [Ndvi-Colormap](#ndvi-colormap-module)
-31. [ReplaceColor](#replacecolor-module)
+31. [NoiseReduction](#noise-reduction)
-32. [Resize](#resize-module)
+32. [Overlay](#overlay-module)
-33. [Rotate](#rotate-module)
+33. [PaintBucket](#paint-bucket-module)
-34. [Saturation](#saturation-module)
+34. [ReplaceColor](#replacecolor-module)
-35. [Segmented-Colormap](#segmented-colormap-module)
+35. [Resize](#resize-module)
-36. [Text-Overlay](#text-overlay)
+36. [Rotate](#rotate-module)
-37. [Threshold](#threshold)
+37. [Saturation](#saturation-module)
-38. [Tint](#tint)
+38. [Segmented-Colormap](#segmented-colormap-module)
+39. [Text-Overlay](#text-overlay)
+40. [Threshold](#threshold)
+41. [Tint](#tint)
+42. [WebGL-Distort](#webgl-distort-module)
+43. [White-Balance](#white-balance-module)
 
 
 ## add-qr-module
@@ -73,7 +78,8 @@ This module is used for averaging all the pixels of the image.
 
 ## blend-module
 
-This module is used for blending two images .
+This module is used for blending two images. For More info read:  _[wiki](https://en.wikipedia.org/wiki/Blend_modes)_
+
 #### Usage
 
 ```js
@@ -83,8 +89,12 @@ This module is used for blending two images .
 ```
 
 where `options` is an object with the following properties:
-* offset: step of image with which current image is to be blended(Two steps back is -2, three                steps back is -3 etc; default -2) 
+* offset: step of image with which current image is to be blended(Two steps back is -2, three steps back is -3 etc; default -2) 
-* func: function used to blend two images (default : function(r1, g1, b1, a1, r2, g2, b2, a2) {            return [ r1, g2, b2, a2 ] })
+* blendMode: Blending mode to use for blending two images by default it uses the given function
+* func: function used to blend two images (default : function(r1, g1, b1, a1, r2, g2, b2, a2) { return [ r1, g2, b2, a2 ] })
+
+[More info for different blend modes can be found here](http://docs.gimp.org/en/gimp-concepts-layer-modes.html)
+
 
 ## Blob Analysis
 
@@ -130,6 +140,24 @@ where `options` is an object with the following property:
 * brightness : brightness of the image in percentage (0 to 100; default 100)
 
 
+## canvas-resize-module
+
+This module is used for resizing the canvas of the image.
+#### Usage
+
+```js
+  sequencer.loadImage('PATH')
+           .addSteps('canvas-resize',options)
+           .run()
+```
+
+where `options` is an object with the following property:
+* width: final width of the canvas (default 1000)
+* height: final height of the canvas (default 1000)
+* x: x-coordinate of the top left of the image on the canvas (default 500)
+* y: y-coordinate of the top left of the image on the canvas (default 500)
+
+
 ## channel-module
 
 This module is used for forming a grayscale image by applying one of the three primary colors.
@@ -326,6 +354,21 @@ where `options` is an object with the following properties:
 * lowThresholdratio : Lower Threshold Ratio ( default : 0.2)
 
 
+## exposure-module
+
+This module is used for changing the exposure of the image.
+#### Usage
+
+```js
+  sequencer.loadImage('PATH')
+           .addSteps('exposure',options)
+           .run()
+```
+
+where `options` is an object with the following property:
+* exposure: exposure value for the new image (-3 to 4; default 1)
+
+
 ## fisheyeGl-module
 
 This module is used for correcting Fisheye or Lens Distortion
@@ -488,6 +531,21 @@ This module is used for demonstrating ndvi and colormap properties consecutively
 ```
 
 
+## Noise-Reduction
+
+Noise in an image are atypical pixels that are not representing the color or the exposure of the scene correctly. This Noise Reduction module reduces the noise in the image by using either median filtering or mean filtering techniques to change the RGB value of the pixels to create a smoother and fuller image.
+
+#### Usage
+```js
+    sequencer.loadImage('PATH')
+             .addSteps('noise-reduction',options)
+             .run()
+```
+where `options` is an object with the property `method`. `options.method` can be:
+* Median Filtering: Set the RGB value of the pixel to the median RGB pixel value of all adjacent pixels (maximum 8 adjacent pixels and itself)
+* Mean Filtering: Set the RGB value of the pixel to the mean RGB pixel value of all adjacent pixels (maximum 8 adjacent pixels and itself)
+
+
 ## overlay-module
 
 This module is used for overlaying an Image over another .
@@ -651,3 +709,38 @@ It adds color tint to an image
 where `options` is an object with the following property:
 * color : RGB values seperated by a space (default "0 0 255")
 * factor : amount of tint (default 0.5)
+
+
+## webgl-distort-module
+
+This module is used for transforming the perspective of images based on corner coordinates.
+#### Usage
+
+```js
+  sequencer.loadImage('PATH')
+           .addSteps('webgl-distort',options)
+           .run()
+```
+
+where `options` is an object with the following property:
+* nw: top-left corner x and y coordinates separated by a comma (default "0,100")
+* ne: top-right corner x and y coordinates separated by a comma (default "1023,-50")
+* se: bottom-right corner x and y coordinates separated by a comma (default "1223,867")
+* sw: bottom-left corner x and y coordinates separated by a comma (default "100,767")
+
+
+## white-balance-module
+
+This module is used for rendering neutral colors of an image correctly based on the whitest pixel in the image.
+#### Usage
+
+```js
+  sequencer.loadImage('PATH')
+           .addSteps('white-balance',options)
+           .run()
+```
+
+where `options` is an object with the following property:
+* red: red component of the whitest pixel (default 255)
+* green: green component of the whitest pixel (default 255)
+* blue: blue component of the whitest pixel (default 255)

examples/demo.css

@@ -1,12 +1,8 @@
 /* https://github.com/theleagueof/league-spartan */
 @font-face {
   font-family: 'League Spartan';
-  src: url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.eot');
+  src: url('https://cdn.jsdelivr.net/npm/fontsource-league-spartan@3/files/league-spartan-latin-600-normal.woff2') format('woff2'),
-  src: url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.eot?#iefix') format('embedded-opentype'),
+       url('https://cdn.jsdelivr.net/npm/fontsource-league-spartan@3/files/league-spartan-latin-600-normal.woff') format('woff');
-       url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.woff2') format('woff2'),
-       url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.woff') format('woff'),
-       url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.ttf') format('truetype'),
-       url('https://raw.githubusercontent.com/theleagueof/league-spartan/master/_webfonts/leaguespartan-bold.svg#league_spartanbold') format('svg');
   font-weight: bold;
   font-style: normal;
 }
@@ -33,7 +29,7 @@ body > .container-fluid {
 
 .center-align {
   display: flex;
-  justify-content: center;
+  justify-content: left;
   text-align:center;
 }
 
@@ -46,6 +42,10 @@ body > .container-fluid {
   margin-right: 20px;
 }
 
+.mouse {
+  cursor: pointer !important;
+}
+
 .nomargin {
   margin: 0 !important;
 }
@@ -63,14 +63,25 @@ body > .container-fluid {
   color: #444;
 }
 
-.hover {
-  background: #eee;
-}
-
 .dropzone input {
   max-width: 100%;
 }
 
+.import-image-zone {
+  margin: 10px auto 30px auto;
+  max-width: 250px;
+  min-width: 230px;
+}
+
+.import-image-zone input {
+  max-width: 100%;
+}
+
+.hover {
+  border: 4px dashed #888888;
+  background: #F0F0F0;
+}
+
 .step {
   margin-bottom: 20px;
 }
@@ -103,7 +114,10 @@ body > .container-fluid {
 }
 
 #add-step-btn{
-  margin-left: 10px;
+  width: 100%
+}
+.selectize-input {
+  width: 100%;
 }
 
 #addStep .labels {
@@ -137,10 +151,16 @@ body > .container-fluid {
   margin: 0px 0px 0px 10px;
   width: 250px;
 }
+
+@media(max-width: 768px) {
+    #dropzone {
+      margin: 0 0% 30px;
+    }
+}
+
 #dwnld {
   max-width: 500px;
   margin: 20px auto;
-  margin-left: 5px;
 }
 
 #gif_element {
@@ -244,13 +264,14 @@ a.name-header{
 }
 
 .step-column{
-  display:flex; 
+  display:flex;
   align-content: center;
   justify-content: center;
 }
 
 .trash-container button.btn-xs {
-  margin-top: -5px !important;
+  position: relative;
+  bottom: 7px;
 }
 
 .toggleIcon {
@@ -267,12 +288,110 @@ a.name-header{
   width:100%;
 }
 .save-button{
-  margin-top:20px; 
+  margin-top:20px;
   margin-bottom:0px;
-  align:center; 
+  align:center;
   width:100%;
 }
 
 .toggle {
   cursor: default;
 }
+
+.general-tooltip:hover{
+  text-decoration: none;
+}
+
+.general-tooltip:focus{
+  outline: none;
+}
+
+.general-tooltip:focus-within{
+  outline: none;
+}
+
+.general-tooltip{
+  position: relative;
+  bottom: 7px;
+  font-size: 16px;
+  color: #444;
+}
+
+#version-number-text {
+  text-align: center;
+  padding-top: 100px;
+  color: gray;
+}
+#version-number-top-right {
+  position: fixed;
+  right: 2%;
+  top: 5%;
+  color: gray;
+}
+/* Non float rightward alignment*/
+.right {
+  margin-left: auto;
+  display: block;
+}
+
+#update-prompt-modal,.notify-box {
+ visibility: hidden;
+ min-width: 250px;
+ margin-left: -125px;
+ background-color: #333;
+ color: #fff;
+ text-align: center;
+ border-radius: 8px;
+ padding: 16px;
+ position: fixed;
+ z-index: 1000;
+ left: 10%;
+ top: 30px;
+}
+
+#update-prompt-modal {
+  width: 30vw;
+  margin: 0.2rem;
+}
+
+.notify-box {
+  width:34vw;
+  padding:18px;
+  border-radius:8px;
+  margin-left:0.8rem;
+  text-align:left;
+  color:#333;
+  background:#c3c3c3;
+}
+
+/* Bootstrap class for display none remove it after updating to version v4 */
+.d-none {
+  display:none;
+}
+
+/* Bootstrap class for display block remove it after updating to version v4 */
+.d-block {
+  display:block;
+}
+
+#update-prompt-modal.show,.notify-box {
+ visibility: visible;
+ -webkit-animation: fadein 0.5s;
+ animation: fadein 0.5s;
+}
+@-webkit-keyframes fadein {
+ from {
+   opacity: 0;
+ }
+ to {
+   opacity: 1;
+ }
+}
+@keyframes fadein {
+ from {
+   opacity: 0;
+ }
+ to {
+   opacity: 1;
+ }
+}

examples/demo.js

@@ -3,12 +3,48 @@ var defaultHtmlSequencerUi = require('./lib/defaultHtmlSequencerUi.js'),
   intermediateHtmlStepUi = require('./lib/intermediateHtmlStepUi.js'),
   DefaultHtmlStepUi = require('./lib/defaultHtmlStepUi.js'),
   urlHash = require('./lib/urlHash.js'),
-  insertPreview = require('./lib/insertPreview.js');
+  insertPreview = require('./lib/insertPreview.js'),
+  versionManagement = require('./lib/versionManagement.js'),
+  isGIF = require('../src/util/isGif');
+
 
 window.onload = function () {
-  sequencer = ImageSequencer();
+  sequencer = ImageSequencer(); // Set the global sequencer variable
+  
+  options = {
+    sortField: 'text',
+    openOnFocus: false,
+    onInitialize: function () {
+      this.$control.on('click', () => {
+        this.ignoreFocusOpen = true;
+        setTimeout(() => {
+          // Trigger onFocus and open dropdown.
+          this.ignoreFocusOpen = false;
+        }, 50);
+      });
+    },
+    // Open dropdown after timeout of onClick.
+    onFocus: function () {
+      if (!this.ignoreFocusOpen) {
+        this.open();
+      }
+    }
+  };
 
-  function refreshOptions() {
+  versionManagement.getLatestVersionNumber(function(versionNumber) {
+    console.log('The latest NPM version number for Image Sequencer (from GitHub) is v' + versionNumber);
+  });
+  console.log('The local version number for Image Sequencer is v' + versionManagement.getLocalVersionNumber());
+
+  function displayVersionNumber() {
+    $('#version-number-text').text('Image Sequencer v' + versionManagement.getLocalVersionNumber());
+    $('#version-number-top-right').text('v' + versionManagement.getLocalVersionNumber());
+  }
+  displayVersionNumber();
+
+  function refreshOptions(options) {
+    // Default options if parameter is empty.
+    if (options == undefined) options = { sortField: 'text' };
     // Load information of all modules (Name, Inputs, Outputs)
     var modulesInfo = sequencer.modulesInfo();
 
@@ -24,15 +60,16 @@ window.onload = function () {
     }
     // Null option
     addStepSelect.append('<option value="" disabled selected>Select a Module</option>');
-    addStepSelect.selectize({
+    addStepSelect.selectize(options);
-      sortField: 'text'
-    });
   }
-  refreshOptions();
+  refreshOptions(options);
 
   $(window).on('scroll', scrollFunction);
 
-  function scrollFunction() {
+  /**
+   * @description Method to toggle the scroll-up arrow.
+   */
+  function scrollFunction(A, B) {
     var shouldDisplay = $('body').scrollTop() > 20 || $(':root').scrollTop() > 20;
 
     $('#move-up').css({
@@ -40,7 +77,9 @@ window.onload = function () {
     });
   }
 
-
+  /**
+   * @description Method to scroll to the top of the page.
+   */
   function topFunction() {
     $('body').animate({scrollTop: 0});
     $(':root').animate({scrollTop: 0});
@@ -55,7 +94,7 @@ window.onload = function () {
   // UI for the overall demo:
   var ui = defaultHtmlSequencerUi(sequencer);
 
-  // find any `src` parameters in URL hash and attempt to source image from them and run the sequencer
+  // Load image data from URL `src` parameter.
   if (urlHash.getUrlHashParameter('src')) {
     sequencer.loadImage(urlHash.getUrlHashParameter('src'), ui.onLoad);
   } else {
@@ -65,25 +104,33 @@ window.onload = function () {
   var resetSequence = function () {
     var r = confirm('Do you want to reset the sequence?');
     if (r)
-      window.location = '/';
+    {
+      window.location.hash = '';
+      location.reload();
+    }
   };
 
   $('#addStep select').on('change', ui.selectNewStepUi);
   $('#addStep #add-step-btn').on('click', ui.addStepUi);
   $('#resetButton').on('click', resetSequence);
 
-  //Module button radio selection
+  // Module Selector quick buttons click handler.
   $('.radio-group .radio').on('click', function () {
     $(this).parent().find('.radio').removeClass('selected');
     $(this).addClass('selected');
     newStep = $(this).attr('data-value');
-    //$("#addStep option[value=" + newStep + "]").attr('selected', 'selected');
+
     $('#addStep select').val(newStep);
     ui.selectNewStepUi(newStep);
     ui.addStepUi(newStep);
     $(this).removeClass('selected');
   });
 
+  /**
+   * @method displayMessageOnSaveSequence
+   * @description When a sequence is saved to a browser, notification is displayed.
+   * @returns {Null}
+   */
   function displayMessageOnSaveSequence() {
     $('.savesequencemsg').fadeIn();
     setTimeout(function () {
@@ -103,7 +150,7 @@ window.onload = function () {
     }
   }
   $('#saveButton').on('click', function () {
-    // different handlers triggered for different dropdown options
+    // Different handlers triggered for different dropdown options.
 
     let dropDownValue = $('#selectSaveOption option:selected').val();
 
@@ -115,14 +162,18 @@ window.onload = function () {
     }
     else if (dropDownValue == 'save-seq') {
       saveSequence();
+    } else if(dropDownValue == 'save-pdf') {
+      savePDF(getLastImage());
+    }
+    else if (dropDownValue == 'save-to-publiclab.org' ){
+      SaveToPubliclab();
     }
   });
 
   let isWorkingOnGifGeneration = false;
 
-  $('.js-view-as-gif').on('click', function (event) {
+  $('.js-view-as-gif').on('click', function (event) { // GIF generation and display
-    /* Prevent user from triggering generation multiple times*/
+    if (isWorkingOnGifGeneration) return; // Prevent multiple button clicks
-    if (isWorkingOnGifGeneration) return;
 
     isWorkingOnGifGeneration = true;
 
@@ -131,12 +182,12 @@ window.onload = function () {
     button.innerHTML = '<i class="fa fa-circle-o-notch fa-spin"></i>';
 
     try {
-      /* Get gif resources of previous steps  */
+      // Get GIF resources from previous steps
       let options = getGifResources();
 
-      gifshot.createGIF(options, function (obj) { // gif generation
+      gifshot.createGIF(options, function (obj) { // GIF generation
         if (!obj.error) {
-          // Final gif encoded with base64 format
+          // Final GIF encoded with base64 format
           var image = obj.image;
           var animatedImage = document.createElement('img');
 
@@ -146,9 +197,7 @@ window.onload = function () {
           let modal = $('#js-download-gif-modal');
 
           $('#js-download-as-gif-button').one('click', function () {
-            // Trigger download
+            downloadGif(image); // Trigger GIF download
-            downloadGif(image);
-            // Close modal
             modal.modal('hide');
           });
 
@@ -160,7 +209,6 @@ window.onload = function () {
           // Insert image
           gifContainer.appendChild(animatedImage);
 
-
           // Open modal
           modal.modal();
 
@@ -179,16 +227,16 @@ window.onload = function () {
   });
 
   function getGifResources() {
-    /* Returns an object with specific gif options */
+    // Returns an object with specific gif options
     let imgs = document.getElementsByClassName('step-thumbnail');
     var imgSrcs = [];
 
-    // Pushes image sources of all the modules in dom
+    // Pushes image sources of all the modules in the DOM
     for (var i = 0; i < imgs.length; i++) {
       imgSrcs.push(imgs[i].src);
     }
 
-    var options = { // gif frame options
+    var options = { // GIF frame options
       'gifWidth': imgs[0].width,
       'gifHeight': imgs[0].height,
       'images': imgSrcs,
@@ -207,11 +255,64 @@ window.onload = function () {
     });
   }
 
-  function downloadGif(image) {
+  /**
-    download(image, 'index.gif', 'image/gif');// downloadjs library function
+  * Get the data URL for the last image in the sequence.
+  * @return {string} The data URL for the last image in the sequence.
+  */
+  function getLastImage() {
+    // Get the image from the last step.
+    let imgs = document.getElementsByClassName('step-thumbnail');
+    let lastStepImage = imgs[imgs.length - 1];
+    return lastStepImage.getAttribute('src');
   }
 
-  // image selection and drag/drop handling from examples/lib/imageSelection.js
+  /**
+  * Download the given image URL as a PDF file.
+  * @param {string} imageDataURL - The data URL for the image.
+  */
+  function savePDF(imageDataURL) {
+    sequencer.getImageDimensions(imageDataURL, function(dimensions) {
+      if (isGIF(imageDataURL)) {
+        // Get the dimensions of the image.
+        let pageWidth = dimensions.width;
+        let pageHeight = dimensions.height;
+
+        // Create a new pdf with the same dimensions as the image.
+        const pdf = new jsPDF({
+          orientation: pageHeight > pageWidth ? 'portrait' : 'landscape',
+          unit: 'px',
+          format: [pageHeight, pageWidth]
+        });
+
+        // Add the image to the pdf with dimensions equal to the internal dimensions of the page.
+        pdf.addImage(imageDataURL, 0, 0, pdf.internal.pageSize.getWidth(), pdf.internal.pageSize.getHeight());
+
+        // Save the pdf with the filename specified here:
+        pdf.save('index.pdf');
+      }
+      else console.log('GIFs cannot be converted to PDF');
+    });
+  }
+
+
+
+  function downloadGif(image) {
+    download(image, 'index.gif', 'image/gif'); // Downloadjs library function
+  }
+
+  function SaveToPubliclab() {
+    function postToPL(imgSrc) {
+      var uniq = Date.now();
+      $('body').append('<form method="post" id="postToPL' + uniq + '" action="https://publiclab.org/post" target="postToPLWindow"><input type="hidden" name="datauri_main_image" /></form>');
+      f = $('#postToPL' + uniq)[0];
+      f.datauri_main_image.value = imgSrc;
+      window.open('', 'postToPLWindow');
+      f.submit();
+    }
+    postToPL($('img')[sequencer.steps.length - 1].src);
+  }
+
+  // Image selection and drag/drop handling from examples/lib/imageSelection.js
   sequencer.setInputStep({
     dropZoneSelector: '#dropzone',
     fileInputSelector: '#fileInput',
@@ -226,8 +327,9 @@ window.onload = function () {
         step.options.step.imgElement.src = reader.result;
       else
         step.imgElement.src = reader.result;
-      insertPreview.updatePreviews(reader.result, '#addStep');
+
-      insertPreview.updatePreviews(sequencer.steps[0].imgElement.src, '.insertDiv');
+      insertPreview.updatePreviews(reader.result, document.querySelector('#addStep'));
+      DefaultHtmlStepUi(sequencer).updateDimensions(step);
     },
     onTakePhoto: function (url) {
       var step = sequencer.steps[0];
@@ -237,16 +339,16 @@ window.onload = function () {
         step.options.step.imgElement.src = url;
       else
         step.imgElement.src = url;
-      insertPreview.updatePreviews(url, '#addStep');
+      insertPreview.updatePreviews(url, document.querySelector('#addStep'));
-      insertPreview.updatePreviews(sequencer.steps[0].imgElement.src, '.insertDiv');
+      DefaultHtmlStepUi(sequencer).updateDimensions(step);
     }
   });
 
   setupCache();
 
-  if (urlHash.getUrlHashParameter('src')) {
+  if (urlHash.getUrlHashParameter('src')) {  // Gets the sequence from the URL
-    insertPreview.updatePreviews(urlHash.getUrlHashParameter('src'), '#addStep');
+    insertPreview.updatePreviews(urlHash.getUrlHashParameter('src'), document.querySelector('#addStep'));
   } else {
-    insertPreview.updatePreviews('images/tulips.png', '#addStep');
+    insertPreview.updatePreviews('images/tulips.png', document.querySelector('#addStep'));
   }
-};
+};

examples/index.html

@@ -33,9 +33,12 @@
   <script src="../node_modules/gifshot/dist/gifshot.min.js" type="text/javascript"></script>
 
   <!-- Download.js for large files -->
-  <script src="../node_modules/downloadjs/download.min.js" type="text/javascript" />
+  <script src="../node_modules/downloadjs/download.min.js" type="text/javascript" ></script>
 
-  <script src="lib/scrollToTop.js"></script>
+  <!-- jspdf to enable save image as pdf -->
+  <script src="../node_modules/jspdf/dist/jspdf.min.js" type="text/javascript" ></script>
+
+  <!-- <script src="lib/scrollToTop.js"></script> -->
   <script src="../node_modules/selectize/dist/js/standalone/selectize.min.js"></script>
 </head>
 
@@ -53,6 +56,17 @@
   <link href="./selectize.default.css" rel="stylesheet">
   <link rel="stylesheet" href="demo.css">
 
+  <div id="update-prompt-modal">A new version of image sequencer is available. Click <a href="#" id="reload">here</a> to update.</div>
+
+  <div class="notify-box d-none">
+    <strong>Failed To Load Image</strong>
+    <button type="button" class="ml-2 mb-1 close" id="close-popup"><span>&times;</span></button>
+    <div class="notify-msg">
+      Can not Load Image Due to CORS Error Learn more about this 
+      <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors" target="_blank">here</a>
+    </div>
+  </div>
+
   <div class="container-fluid">
 
     <header class="text-center">
@@ -70,10 +84,11 @@
         </a>
         by <a href="https://publiclab.org" title="Publiclab Website"><i class="fa fa-globe"></i> Publiclab</a>
       </p>
+      <span id="version-number-top-right"></span>
     </header>
 
     <div id="dropzone" class="dropzone">
-      <p>
+      <p id="dropzone-text">
         <i>Select or drag in an image to start!</i>
       </p>
       <center>
@@ -139,16 +154,16 @@
                   <p>Crop</p>
                 </div>
               </div>
-              <div class="row center-align">
+              <div class="row justify-content-center">
-                <div class="col-md-8">
+                <div class="col-lg-8">
 
-                  <select id="selectStep">
+                  <select id="selectStep" class="text-center">
                     <!-- The default null selection has been appended manually in demo.js
               This is because the options in select are overritten when options are appended.-->
                   </select>
                 </div>
-                <div class="col-md-4">
+                <div class="col-lg-4">
-                  <button class="btn btn-success btn-lg" name="add" id="add-step-btn">Add Step</button></div>
+                  <button class="btn btn-primary btn-lg" name="add" id="add-step-btn">Add Step</button></div>
               </div>
               <div class="row center-align">
                 <button id="resetButton" class="btn btn-default btn-lg"
@@ -187,11 +202,13 @@
             <div class="panel-body">
               <div style="text-align:center;">
                 <h2 style="margin-top:20px">Save</h2>
-                <select class="form-control input-md" id="selectSaveOption" style="margin-top:20px">
+                <select class="form-control input-md mouse" id="selectSaveOption" style="margin-top:20px">
                   <option value="save-image">Save as PNG</option>
                   <option value="save-gif">Save as GIF (all steps)</option>
+                  <option value="save-pdf">Save as PDF</option>
                   <option value="save-seq">Save sequence</option>
                   <option value="save-seq-string">Save sequence string</option>
+                  <option value="save-to-publiclab.org">Save to PublicLab.org</option>>
                 </select>
                 <p><button id="saveButton" class="btn btn-primary btn-lg save-button">Save</button></p>
                 <p><button class="btn btn-default btn-lg js-view-as-gif" id="gif">Preview GIF</button></p>
@@ -210,7 +227,7 @@
           <h2>Need Help?</h2>
           <p>
             <a class="btn btn-default" href="https://github.com/publiclab/image-sequencer/issues">Ask a question</a>
-            <a class="btn btn-default" href="https://publiclab.org/chat">Ask in our chatroom</a>
+            <a class="btn btn-default" href="https://gitter.im/publiclab/image-sequencer"  target="_blank">Ask in our chatroom </a>
           </p>
         </div>
         <div class="col-md-6">
@@ -223,6 +240,9 @@
           </p>
         </div>
       </div>
+      <div class="row">
+        <p id="version-number-text">Loading Version Number</p>
+      </div>
     </footer>
 
     <button id="move-up"><i class="fa fa-arrow-circle-o-up"></i></button>

examples/lib/cache.js

@@ -1,18 +1,71 @@
 var setupCache = function() {
+  let newWorker; // When sw.js is changed, this is the new service worker generated.
+  
+  // Toggle a CSS class to display a popup prompting the user to fetch a new version.
+  function showUpdateModal() {
+    $('#update-prompt-modal').addClass('show');
+  }
+
+  /**
+  * When a new service worker has been loaded, the button in the update prompt
+  * modal should trigger the skipWaiting event to replace the current
+  * service worker with the new one.
+  */
+  $('#reload').on('click', function() {
+    newWorker.postMessage({ action: 'skipWaiting' });
+  });
+
   if ('serviceWorker' in navigator) {
+    // Register the service worker.
     navigator.serviceWorker.register('sw.js', { scope: '/examples/' })
       .then(function(registration) {
-        const installingWorker = registration.installing;
+
-        installingWorker.onstatechange = () => {
+          return new Promise(function(resolve,reject){
-          console.log(installingWorker);
+
-          if (installingWorker.state === 'installed') {
+            registration.addEventListener('updatefound', () => {
-            location.reload();
+              // When sw.js has been changed, get a reference to the new service worker.
-          }
+              newWorker = registration.installing;
-        };
+
-        console.log('Registration successful, scope is:', registration.scope);
+              if(!newWorker){
-      })
+                return reject(new Error('error in installing service worker'));
-      .catch(function(error) {
+              }
-        console.log('Service worker registration failed, error:', error);
+
+            newWorker.addEventListener('statechange', () => {
+              // Check if service worker state has changed.
+              switch(newWorker.state) {
+                case 'installed':
+                  if(navigator.serviceWorker.controller) {
+                    // New service worker available; prompt the user to update.
+                    showUpdateModal();
+                    $('#reload').on('click',(e) => {
+                      e.preventDefault();
+                      console.log('New Service Worker Installed Successfully');
+                      location.reload();
+                      return resolve();
+                    })
+                  }
+                  // No updates available; do nothing.
+                  break;
+
+                case 'redundant':
+                  return reject(new Error('installing new service worker now became redundant'));
+              }
+            })
+          })
+        })
+      }).catch(err => {
+        console.log('Failed In Registering Service Worker: ',err);
+      });
+
+      /**
+      * This is the event listener for when the service worker updates.
+      * When the service worker updates, reload the page.
+      */
+      let refreshing;
+      navigator.serviceWorker.addEventListener('controllerchange', function() {
+        if(refreshing) return;
+        window.location.reload();
+        refreshing = true;
       });
   }
 
@@ -24,16 +77,22 @@ var setupCache = function() {
     });
   }
 
-  $('#clear-cache').click(function() {
+  const clearCache = () => {
     if ('serviceWorker' in navigator) {
-      caches.keys().then(function(cacheNames) {
+      return caches.keys()
-        cacheNames.forEach(function(cacheName) {
+        .then(function(cache) {
-          caches.delete(cacheName);
+          return Promise.all(cache.map(function(cacheItem) {
-        });
+            return caches.delete(cacheItem);
+        }));
       });
     }
+  }
+
+  $('#clear-cache').click(function() {
+    clearCache();
     location.reload();
   });
+
 };
 
 module.exports = setupCache;

examples/lib/defaultHtmlSequencerUi.js

@@ -1,4 +1,5 @@
 var urlHash = require('./urlHash.js');
+   insertPreview = require('./insertPreview.js');
 function DefaultHtmlSequencerUi(_sequencer, options) {
 
   options = options || {};
@@ -27,12 +28,17 @@ function DefaultHtmlSequencerUi(_sequencer, options) {
   function selectNewStepUi() {
     var m = $(addStepSel + ' select').val();
     if(!m) m = arguments[0];
-    $(addStepSel + ' .info').html(_sequencer.modulesInfo(m).description);
+    else $(addStepSel + ' .info').html(_sequencer.modulesInfo(m).description);
     $(addStepSel + ' #add-step-btn').prop('disabled', false);
   }
 
   function removeStepUi() {
     var index = $(removeStepSel).index(this) + 1;
+    // If last step is removed.
+    if(sequencer.steps.length==index+1){
+      console.log("inside")
+      insertPreview.updatePreviews(sequencer.steps[index-1].output.src, document.querySelector('#addStep'));
+    }
     sequencer.removeSteps(index).run({ index: index - 1 });
     // remove from URL hash too
     urlHash.setUrlHashParameter('steps', sequencer.toString());
@@ -41,7 +47,12 @@ function DefaultHtmlSequencerUi(_sequencer, options) {
   }
 
   function addStepUi() {
-    if ($(addStepSel + ' select').val() == 'none') return;
+    
+    if ($(addStepSel + ' select').val() == ''){
+      alert('Please Select a Step to Proceed');
+      return;
+    }
+
     var newStepName;
     if(typeof arguments[0] !== 'string')
       newStepName = $(addStepSel + ' select option').html().toLowerCase().split(' ').join('-');

examples/lib/defaultHtmlStepUi.js

@@ -11,29 +11,38 @@
 const intermediateHtmlStepUi = require('./intermediateHtmlStepUi.js'),
   urlHash = require('./urlHash.js'),
   _ = require('lodash'),
+  insertPreview = require('./insertPreview.js');
   mapHtmlTypes = require('./mapHtmltypes'),
-  scopeQuery = require('./scopeQuery');
+  scopeQuery = require('./scopeQuery'),
+  isGIF = require('../../src/util/isGif');
 
 function DefaultHtmlStepUi(_sequencer, options) {
-  let $step, $stepAll;
-
   options = options || {};
   var stepsEl = options.stepsEl || document.querySelector('#steps');
   var selectStepSel = options.selectStepSel = options.selectStepSel || '#selectStep';
 
   function onSetup(step, stepOptions) {
-
     if (step.options && step.options.description)
       step.description = step.options.description;
+    
+    let stepDocsLink = '';
+    if (step.moduleInfo) stepDocsLink = step.moduleInfo['docs-link'] || '';
 
-    step.ui =
+    step.ui = // Basic UI markup for the step
       '\
       <div class="container-fluid step-container">\
           <div class="panel panel-default">\
             <div class="panel-heading">\
-              <div class="trash-container pull-right"></div>\
+              <div class="trash-container pull-right">\
+                <a type="button" target="_blank" href="https://developer.mozilla.org/en-US/docs/WebAssembly" style="display: none;" class="btn btn-link general-tooltip wasm-tooltip" data-toggle="tooltip" data-html="true" data-original-title="<div style=\'text-align: center\'><p>This step is Web Assembly accelerated. Click to Read More</div>">\
+                  <i class="fa fa-bolt"></i>\
+                </a>\
+                <button type="button" class="btn btn-link ' + step.name + ' general-tooltip dimension-tooltip" data-toggle="tooltip" data-html="true" data-original-title="">\
+                  <i class="fa fa-info-circle"></i>\
+                </button>\
+              </div>\
               <h3 class="panel-title">' +
-                '<span class="toggle">' + step.name + ' <span class="caret toggleIcon rotated"></span>\
+                '<span class="toggle mouse">' + step.name + ' <span class="caret toggleIcon rotated"></span>\
                  <span class="load-spin pull-right" style="display:none;padding:1px 8px;"><i class="fa fa-circle-o-notch fa-spin"></i></span>\
               </h3>\
             </div>\
@@ -42,7 +51,7 @@ function DefaultHtmlStepUi(_sequencer, options) {
               <div class="row step">\
                 <div class="col-md-4 details container-fluid">\
                   <div class="cal collapse in"><p>' +
-                    '<i>' + (step.description || '') + '</i>' +
+                    '<a href="' + stepDocsLink + '">' + (step.description || '') + '</a>' +
                  '</p></div>\
                 </div>\
                 <div class="col-md-8 cal collapse in step-column">\
@@ -59,7 +68,7 @@ function DefaultHtmlStepUi(_sequencer, options) {
       </div>';
 
     var tools =
-    '<div class="trash">\
+    '<div class="trash" style="display: inline-block">\
       <button confirm="Are you sure?" class="remove btn btn-default btn-xs">\
         <i class="fa fa-trash"></i>\
       </button>\
@@ -68,21 +77,20 @@ function DefaultHtmlStepUi(_sequencer, options) {
     var util = intermediateHtmlStepUi(_sequencer, step);
 
     var parser = new DOMParser();
-    step.ui = parser.parseFromString(step.ui, 'text/html');
+    step.ui = parser.parseFromString(step.ui, 'text/html'); // Convert the markup string to a DOM node.
     step.ui = step.ui.querySelector('div.container-fluid');
 
-    $step = scopeQuery.scopeSelector(step.ui);
+    step.$step = scopeQuery.scopeSelector(step.ui); // Shorthand methods for scoped DOM queries. Read the docs [CONTRIBUTING.md](https://github.com/publiclab/image-sequencer/blob/main/CONTRIBUTING.md) for more info.
-    $stepAll = scopeQuery.scopeSelectorAll(step.ui);
+    step.$stepAll = scopeQuery.scopeSelectorAll(step.ui);
-    step.ui.$step = $step;
+    let {$step, $stepAll} = step;
-    step.ui.$stepAll = $stepAll;
 
-    step.linkElements = step.ui.querySelectorAll('a');
+    step.linkElements = step.ui.querySelectorAll('a'); // All the anchor tags in the step UI
-    step.imgElement = $step('a img.img-thumbnail')[0];
+    step.imgElement = $step('a img.img-thumbnail')[0]; // The output image
 
     if (_sequencer.modulesInfo().hasOwnProperty(step.name)) {
       var inputs = _sequencer.modulesInfo(step.name).inputs;
       var outputs = _sequencer.modulesInfo(step.name).outputs;
-      var merged = Object.assign(inputs, outputs); // combine outputs w inputs
+      var merged = Object.assign(inputs, outputs); // Combine outputs with inputs
 
       for (var paramName in merged) {
         var isInput = inputs.hasOwnProperty(paramName);
@@ -102,10 +110,10 @@ function DefaultHtmlStepUi(_sequencer, options) {
         else {
           let paramVal = step.options[paramName] || inputDesc.default;
 
-          if (inputDesc.id == 'color-picker') { // separate input field for color-picker
+          if (inputDesc.id == 'color-picker') { // Separate input field for color-picker
             html +=
               '<div id="color-picker" class="input-group colorpicker-component">' +
-              '<input class="form-control target" type="' +
+              '<input class="form-control color-picker-target" type="' +
               inputDesc.type +
               '" name="' +
               paramName +
@@ -113,7 +121,14 @@ function DefaultHtmlStepUi(_sequencer, options) {
               paramVal + '">' + '<span class="input-group-addon"><i></i></span>' +
               '</div>';
           }
-          else { // use this if the the field isn't color-picker
+          else if(inputDesc.type === 'button'){
+            html = '<div><button name="' + paramName + '" type="' + inputDesc.type + '" >\
+            <i class="fa fa-crosshairs"></i></button>\
+            <span>click to select coordinates</span>\
+            </div>';
+          }
+          else { // Non color-picker input types and other than a button
+
             html =
               '<input class="form-control target" type="' +
               inputDesc.type +
@@ -123,7 +138,7 @@ function DefaultHtmlStepUi(_sequencer, options) {
               paramVal +
               '" placeholder ="' +
               (inputDesc.placeholder || '');
-              
+
             if (inputDesc.type.toLowerCase() == 'range') {
               html +=
                 '"min="' +
@@ -131,7 +146,7 @@ function DefaultHtmlStepUi(_sequencer, options) {
                 '"max="' +
                 inputDesc.max +
                 '"step="' +
-                (inputDesc.step ? inputDesc.step : 1) + '">' + '<span>' + paramVal + '</span>';
+                inputDesc.step + '">' + '<span>' + paramVal + '</span>';
 
             }
             else html += '">';
@@ -155,10 +170,10 @@ function DefaultHtmlStepUi(_sequencer, options) {
                          </div>';
         $step('div.details').append(div);
       }
-      $step('div.panel-footer').append(
+      $step('div.panel-footer').append( // Save button
         '<div class="cal collapse in"><button type="submit" class="btn btn-sm btn-default btn-save" disabled = "true" >Apply</button> <small style="padding-top:2px;">Press apply to see changes</small></div>'
       );
-      $step('div.panel-footer').prepend(
+      $step('div.panel-footer').prepend( // Markup for tools: download and insert step buttons
         '<button class="pull-right btn btn-default btn-sm insert-step" >\
         <span class="insert-text"><i class="fa fa-plus"></i> Insert Step</span><span class="no-insert-text" style="display:none">Close</span></button>\
         <button class="pull-right btn btn-default btn-sm download-btn" style="margin-right:2px" >\
@@ -173,9 +188,10 @@ function DefaultHtmlStepUi(_sequencer, options) {
           parser.parseFromString(tools, 'text/html').querySelector('div')
         );
 
-      $stepAll('.remove').on('click', function() {notify('Step Removed', 'remove-notification');});
+      $stepAll('.remove').on('click', function() {notify('Step Removed', 'remove-notification');}); // Notification on removal of a step
-      $stepAll('.insert-step').on('click', function() { util.insertStep(step.ID); });
+      $step('.insert-step').on('click', function() { util.insertStep(step.ID); }); // Insert a step in between the sequence
       // Insert the step's UI in the right place
+
       if (stepOptions.index == _sequencer.steps.length) {
         stepsEl.appendChild(step.ui);
         $('#steps .step-container:nth-last-child(1) .insert-step').prop('disabled', true);
@@ -185,16 +201,30 @@ function DefaultHtmlStepUi(_sequencer, options) {
       else {
         stepsEl.insertBefore(step.ui, $(stepsEl).children()[stepOptions.index]);
       }
+
+      // Enable the load-image insert-step button when there are steps after load-image
+      // The logical operator is `> 0` because the number of steps is found before adding the step, actual logic is `steps.length + 1 > 1` which is later simplified.
+      if (_sequencer.steps.length > 0) $('#load-image .insert-step').prop('disabled', false);
+      else $('#load-image .insert-step').prop('disabled', true);
     }
     else {
-      $('#load-image').append(step.ui);
+      $('#load-image').append(step.ui); // Default UI without extra tools for the first step(load image)
+
+      $step('div.panel-footer').prepend( `
+          <button class="right btn btn-default btn-sm insert-step" disabled="true">
+            <span class="insert-text"><i class="fa fa-plus"></i> Insert Step</span>
+            <span class="no-insert-text" style="display:none">Close</span>
+          </button>`
+      );
+
+      $step('.insert-step').on('click', function() { util.insertStep(step.ID); });
     }
-    $step('.toggle').on('click', () => {
+    $step('.toggle').on('click', () => { // Step container dropdown
       $step('.toggleIcon').toggleClass('rotated');
       $stepAll('.cal').collapse('toggle');
     });
-    
+
-    $(step.imgElement).on('mousemove', _.debounce(() => imageHover(step), 150));
+    $(step.imgElement).on('mousemove', _.debounce(() => imageHover(step), 150)); // Shows the pixel coordinates on hover
     $(step.imgElement).on('click', (e) => {e.preventDefault(); });
     $stepAll('#color-picker').colorpicker();
 
@@ -211,15 +241,23 @@ function DefaultHtmlStepUi(_sequencer, options) {
           });
         _sequencer.run({ index: step.index - 1 });
 
-        // modify the url hash
+        // Modify the URL hash
         urlHash.setUrlHashParameter('steps', _sequencer.toString());
-        // disable the save button
+        // Disable the save button
         $step('.btn-save').prop('disabled', true);
         optionsChanged = false;
         changedInputs = 0;
       }
     }
 
+    /**
+     * @method handleInputValueChange
+     * @description Enables the save button on input change
+     * @param {*} currentValue The current value of the input
+     * @param {*} initValue The initial/old value of the input
+     * @param {Boolean} hasChangedBefore Whether the input was changed before
+     * @returns {Boolean} True if the value has changed
+     */
     function handleInputValueChange(currentValue, initValue, hasChangedBefore) {
       var inputChanged = !(isNaN(initValue) || isNaN(currentValue) ? currentValue === initValue : currentValue - initValue === 0);
       changedInputs += hasChangedBefore ? inputChanged ? 0 : -1 : inputChanged ? 1 : 0;
@@ -250,6 +288,21 @@ function DefaultHtmlStepUi(_sequencer, options) {
         });
     });
 
+    $stepAll('.color-picker-target').each(function(i, input) {
+      $(input)
+        .data('initValue', $(input).val())
+        .data('hasChangedBefore', false)
+        .on('input change', function() {
+          $(this)
+            .data('hasChangedBefore',
+              handleInputValueChange(
+                $(this).val(),
+                $(this).data('initValue'),
+                $(this).data('hasChangedBefore')
+              )
+            );
+        });
+    });
 
 
     $('input[type="range"]').on('input', function() {
@@ -258,17 +311,20 @@ function DefaultHtmlStepUi(_sequencer, options) {
   }
 
 
-  function onDraw() {
+  function onDraw({$step, $stepAll}) {
     $step('.load').show();
     $step('img').hide();
     $stepAll('.load-spin').show();
   }
 
   function onComplete(step) {
+    let {$step, $stepAll} = step;
     $step('img').show();
     $stepAll('.load-spin').hide();
     $step('.load').hide();
 
+    $stepAll('.download-btn').off('click');
+    
     step.imgElement.src = (step.name == 'load-image') ? step.output.src : step.output;
     var imgthumbnail = $step('.img-thumbnail').getDomElem();
     for (let index = 0; index < step.linkElements.length; index++) {
@@ -276,28 +332,35 @@ function DefaultHtmlStepUi(_sequencer, options) {
         step.linkElements[index].href = step.imgElement.src;
     }
 
-    // TODO: use a generalized version of this
+    // TODO: use a generalized version of this.
     function fileExtension(output) {
       return output.split('/')[1].split(';')[0];
     }
 
     $stepAll('.download-btn').on('click', () => {
 
-      for (let index = 0; index < step.linkElements.length; index++){
+      function dataURLtoBlob(dataurl) {
-        
+        let arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
-        var element = document.createElement('a');
+          bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
-        element.setAttribute('href', step.linkElements[index].href);
+        while(n--){
-        element.setAttribute('download', step.name + '.' + fileExtension(step.imgElement.src));
+          u8arr[n] = bstr.charCodeAt(n);
-        element.style.display = 'none';
+        }
-        document.body.appendChild(element);
+        return new Blob([u8arr], {type:mime});
-        
-        element.click();
-
-        document.body.removeChild(element);
       }
+      
+      var element = document.createElement('a');
+      
+      element.setAttribute('download', step.name + '.' + fileExtension(step.imgElement.src));
+      element.style.display = 'none';
+      document.body.appendChild(element);
+      var blob = dataURLtoBlob(step.output);
+      var objurl = URL.createObjectURL(blob);
+      element.setAttribute('href', objurl);
+      
+      element.click();
     });
 
-    // fill inputs with stored step options
+    // Fill inputs with stored step options
     if (_sequencer.modulesInfo().hasOwnProperty(step.name)) {
       var inputs = _sequencer.modulesInfo(step.name).inputs;
       var outputs = _sequencer.modulesInfo(step.name).outputs;
@@ -309,7 +372,7 @@ function DefaultHtmlStepUi(_sequencer, options) {
               .data('initValue', step.options[i]);
           if (inputs[i].type.toLowerCase() === 'select')
             $step('div[name="' + i + '"] select')
-              .val(step.options[i])
+              .val(String(step.options[i]))
               .data('initValue', step.options[i]);
         }
       }
@@ -319,12 +382,58 @@ function DefaultHtmlStepUi(_sequencer, options) {
             .val(step[i]);
       }
     }
+
+    $(function () {
+      $('[data-toggle="tooltip"]').tooltip();
+      updateDimensions(step);
+    });
+
+    if (step.name === 'load-image') insertPreview.updatePreviews(step.output.src, document.querySelector('#addStep'));
+    else insertPreview.updatePreviews(step.output, document.querySelector('#addStep'));  
+
+    // Handle the wasm bolt display
+
+    if (step.useWasm) {
+      if (step.wasmSuccess) $step('.wasm-tooltip').fadeIn();
+      else $step('.wasm-tooltip').fadeOut();
+    }
+    else $step('.wasm-tooltip').fadeOut();
+  }
+  /**
+   * @description Updates Dimension of the image
+   * @param {Object} step  - Current Step
+   * @returns {void}
+   *
+   */
+  function updateDimensions(step){
+    _sequencer.getImageDimensions(step.imgElement.src, function (dim) {
+      step.ui.querySelector('.' + step.name).attributes['data-original-title'].value = `<div style="text-align: center"><p>Image Width: ${dim.width}<br>Image Height: ${dim.height}</br>${isGIF(step.output) ? `Frames: ${dim.frames}` : ''}</div>`;
+    });
   }
 
+  /**
+   * @method imageHover
+   * @description Handler to display image coordinates on hover.
+   * @param {Object} step Current step variable
+   * @returns {Null}
+   */
   function imageHover(step){
 
     var img = $(step.imgElement);
 
+    let customXCoord = '20'; //default x coordinate
+    let customYCoord = '20'; //default y coordinate
+
+    const customButton = $('button[name="Custom-Coordinates"]');
+      img.click(function(e) {
+          customXCoord = e.offsetX;
+          customYCoord = e.offsetY;
+          customButton.click(function() {
+            $('input[name="x"]').val(customXCoord);
+            $('input[name="y"]').val(customYCoord);
+          })
+      });
+
     img.mousemove(function(e) {
       var canvas = document.createElement('canvas');
       canvas.width = img.width();
@@ -343,27 +452,42 @@ function DefaultHtmlStepUi(_sequencer, options) {
   function onRemove(step) {
     step.ui.remove();
     $('#steps .step-container:nth-last-child(1) .insert-step').prop('disabled', true);
-    $('div[class*=imgareaselect-]').remove();
+
+    // Enable the load-image insert-step button when there are steps after load-image
+    // The logical operator is `> 2` because the number of steps is found before removing the step, actual logic is `steps.length - 1 > 1` which is later simplified.
+    if (_sequencer.steps.length - 1 > 1) $('#load-image .insert-step').prop('disabled', false);
+    else $('#load-image .insert-step').prop('disabled', true);
+
+    $(step.imgElement).imgAreaSelect({
+      remove: true
+    });
   }
 
   function getPreview() {
     return step.imgElement;
   }
 
+  /**
+   * @method notify
+   * @description General purpose DOM toast notification
+   * @param {String} msg Message to be displayed
+   * @param {String} id A unique identifier for the notification
+   * @returns {Null}
+   */
   function notify(msg, id){
     if ($('#' + id).length == 0) {
       var notification = document.createElement('span');
       notification.innerHTML = ' <i class="fa fa-info-circle" aria-hidden="true"></i> ' + msg ;
       notification.id = id;
       notification.classList.add('notification');
-  
+
       $('body').append(notification);
     }
-  
+
     $('#' + id).fadeIn(500).delay(200).fadeOut(500);
   }
-    
+
-  
+
   return {
     getPreview: getPreview,
     onSetup: onSetup,
@@ -371,7 +495,8 @@ function DefaultHtmlStepUi(_sequencer, options) {
     onRemove: onRemove,
     onDraw: onDraw,
     notify: notify,
-    imageHover: imageHover
+    imageHover: imageHover,
+    updateDimensions: updateDimensions
   };
 }
 

examples/lib/insertPreview.js

@@ -1,5 +1,5 @@
-function generatePreview(previewStepName, customValues, path, selector) {
+// Generate downscaled preview images for quick buttons.
-
+function generatePreview(previewStepName, customValues, path, DomNode) {
   var previewSequencer = ImageSequencer();
   function insertPreview(src) {
     var img = document.createElement('img');
@@ -8,9 +8,10 @@ function generatePreview(previewStepName, customValues, path, selector) {
     img.src = src;
     $(img).css('max-width', '200%');
     $(img).css('transform', 'translateX(-20%)');
-    $(selector + ' .radio-group').find('div').each(function() {
+    $(DomNode.querySelector('.radio-group')).find('.radio').each(function() {
-      if ($(this).find('div').attr('data-value') === previewStepName) {
+      if ($(this).attr('data-value') === previewStepName) {
-        $(this).find('div').append(img);
+        $(this).find('img').remove();
+        $(this).append(img);
       }
     });
   }
@@ -29,8 +30,8 @@ function generatePreview(previewStepName, customValues, path, selector) {
     previewSequencer.loadImage(path, loadPreview);
 }
 
-function updatePreviews(src, selector) {
+function updatePreviews(src, DomNode) {
-  $(selector + ' img').remove();
+  $(DomNode).find('img').remove();
 
   var previewSequencerSteps = {
     'resize': '125%',
@@ -41,19 +42,20 @@ function updatePreviews(src, selector) {
     'crop': {
       'x': 0,
       'y': 0,
-      'w': '(50%)',
+      'w': '50%',
-      'h': '(50%)',
+      'h': '50%',
       'noUI': true
     }
   };
 
   var img = new Image();
+
   img.onload = function(){
     var height = img.height;
     var width = img.width;
 
-    let percentage = (80 / height) * 100; //take the min resize value that fits the preview area => (new-width/orig_ht) - '80 as the preview area has 80*80 dimension
+    let percentage = (80 / height) * 100; // Take the min resize value that fits the preview area => (new-width/orig_ht) - '80 as the preview area has 80*80 dimension.
-    percentage = Math.max((80 / width) * 100, percentage); // make sure that one dimension doesn't resize greater, leading distorting preview-area fitting
+    percentage = Math.max((80 / width) * 100, percentage); // Make sure that one dimension doesn't resize greater, leading distorting preview-area fitting.
     percentage = Math.ceil(percentage);
 
     var sequencer = ImageSequencer();
@@ -62,7 +64,7 @@ function updatePreviews(src, selector) {
       this.addSteps('resize', {['resize']: percentage + '%'});
       this.run((src)=>{
         Object.keys(previewSequencerSteps).forEach(function (step, index) {
-          generatePreview(step, Object.values(previewSequencerSteps)[index], src, selector);
+          generatePreview(step, Object.values(previewSequencerSteps)[index], src, DomNode);
         });
       });
     });
@@ -74,4 +76,4 @@ function updatePreviews(src, selector) {
 module.exports = {
   generatePreview : generatePreview,
   updatePreviews : updatePreviews
-};
+};

examples/lib/intermediateHtmlStepUi.js

@@ -1,8 +1,17 @@
 var urlHash = require('./urlHash.js'),
   insertPreview = require('./insertPreview.js');
 
+/**
+ * @method IntermediateHtmlStepUi
+ * @description Inserts a module selector in between the current sequence
+ * @param {Object} _sequencer Sequencer instance
+ * @param {Object} step Current step variable
+ * @param {Object} options Optional options Object
+ * @returns {Object} Object containing the insertStep function
+ */
 function IntermediateHtmlStepUi(_sequencer, step, options) {
   function stepUI() {
+    // Basic markup for the selector
     return '<div class="row insertDiv collapse">\
           <section class="panel panel-primary .insert-step">\
             <button class="btn btn-default close-insert-box"><i class="fa fa-times" aria-hidden="true"></i> Close</button>\
@@ -55,7 +64,7 @@ function IntermediateHtmlStepUi(_sequencer, step, options) {
                     </select>\
                   <div>\
                   <div class="col-md-4">\
-                    <button class="btn btn-success btn-lg insert-save-btn add-step-btn" name="add">Add Step</button>\
+                    <button class="btn btn-primary btn-lg insert-save-btn add-step-btn" name="add">Add Step</button>\
                   <div>\
                 </div>\
               </div>\
@@ -64,15 +73,13 @@ function IntermediateHtmlStepUi(_sequencer, step, options) {
         </div>';
   }
 
-
+  /**
-  function selectNewStepUi($step) {
+   * @method toggleDiv
-    var insertSelect = $step('.insert-step-select');
+   * @description Toggles the module selector dropdown.
-    var m = insertSelect.val();
+   * @param {Object} $step $step util function
-    $step('.insertDiv .info').html(_sequencer.modulesInfo(m).description);
+   * @param {Fucntion} callback Optional callback function
-    $step('.insertDiv .add-step-btn').prop('disabled', false);
+   * @returns {Null}
-  }
+   */
-    
-    
   var toggleDiv = function($step, callback = function(){}){
     $step('.insertDiv').collapse('toggle');
     if ($step('.insert-text').css('display') != 'none'){
@@ -83,13 +90,19 @@ function IntermediateHtmlStepUi(_sequencer, step, options) {
     }
   };
 
+  /**
+   * @method insertStep
+   * @description Handler to insert selected module in the sequence
+   * @returns {Null}
+   */
   insertStep = function (id) {
-    const $step = step.ui.$step,
+    const $step = step.$step,
-      $stepAll = step.ui.$stepAll;
+      $stepAll = step.$stepAll;
     var modulesInfo = _sequencer.modulesInfo();
     var parser = new DOMParser();
     var addStepUI = stepUI();
     addStepUI = parser.parseFromString(addStepUI, 'text/html').querySelector('div');
+
     if ($step('.insertDiv').length > 0){
       toggleDiv($step);
     }
@@ -100,60 +113,56 @@ function IntermediateHtmlStepUi(_sequencer, step, options) {
           addStepUI
         );
       toggleDiv($step, function(){
-        insertPreview.updatePreviews(step.output, '.insertDiv');
+        if (step.name === 'load-image') insertPreview.updatePreviews(step.output.src, $step('.insertDiv').getDomElem());
+        else insertPreview.updatePreviews(step.output, $step('.insertDiv').getDomElem());
       });
     }
 
-    $step('.insertDiv .close-insert-box').off('click').on('click', function(){toggleDiv(function(){});});
+
-    
+    $step('.insertDiv .close-insert-box').off('click').on('click', function(){
+      toggleDiv($step);
+      $step('.insertDiv').removeClass('insertDiv');
+    });
+
     var insertStepSelect = $step('.insert-step-select');
     insertStepSelect.html('');
+
     // Add modules to the insertStep dropdown
     for (var m in modulesInfo) {
-      if (modulesInfo[m] !== undefined)
+      if (modulesInfo[m] && modulesInfo[m].name)
         insertStepSelect.append(
           '<option value="' + m + '">' + modulesInfo[m].name + '</option>'
         );
     }
+
     insertStepSelect.selectize({
       sortField: 'text'
     });
-    $step('.inserDiv .add-step-btn').prop('disabled', true);
+
-    
+    $('.insertDiv .radio-group .radio').on('click', function () {
-    insertStepSelect.append('<option value="" disabled selected>Select a Module</option>');
+      var newStepName = $(this).attr('data-value'); // Get the name of the module to be inserted
-    $step('.insertDiv .radio-group .radio').on('click', function () {
+      id = $($step('.insertDiv').parents()[3]).prevAll().length;
-      $(this).parent().find('.radio').removeClass('selected');
+      insert(id, $step, newStepName); // Insert the selected module
-      $(this).addClass('selected');
-      newStep = $(this).attr('data-value');
-      $step('.insert-step-select').val(newStep);
-      selectNewStepUi($step);
-      insert(id, $step);
-      $(this).removeClass('selected');
     });
-    insertStepSelect.on('change', () => {selectNewStepUi($step);});
+
-    $step('.insertDiv .add-step-btn').on('click', function () { insert(id, $step); });
+    $step('.insertDiv .add-step-btn').on('click', function () {
+      var newStepName = insertStepSelect.val();
+      id = $($step('.insertDiv').parents()[3]).prevAll().length;
+      insert(id, $step, newStepName); });
   };
 
-  function insert(id, $step) {
+  /**
-
+   * @method insert
-    options = options || {};
+   * @description Inserts the specified step at the specified index in the sequence
-    var insertStepSelect = $step('.insert-step-select');
+   * @param {Number} id Index of the step
-    if (insertStepSelect.val() == 'none') return;
+   * @param {Function} $step $step util function
-
+   * @param {String} newStepName Name of the new step
-    var newStepName = insertStepSelect.val();
+   */
+  function insert(id, $step, newStepName) {
     toggleDiv($step);
-    var sequenceLength = 1;
+    $step('.insertDiv').removeClass('insertDiv');
-    if (sequencer.sequences[newStepName]) {
+    _sequencer.insertSteps(id + 1, newStepName).run({ index: id });
-      sequenceLength = sequencer.sequences[newStepName].length;
-    } else if (sequencer.modules[newStepName][1]['length']) {
-      sequenceLength = sequencer.modules[newStepName][1]['length'];
-    }
-    _sequencer
-      .insertSteps(id + 1, newStepName).run({ index: id });
-
-    // add to URL hash too
     urlHash.setUrlHashParameter('steps', _sequencer.toString());
-
   }
 
   return {
@@ -161,4 +170,3 @@ function IntermediateHtmlStepUi(_sequencer, step, options) {
   };
 }
 module.exports = IntermediateHtmlStepUi;
-

examples/lib/mapHtmltypes.js

@@ -1,8 +1,13 @@
+/**
+ * @description Maps module input types to their respective html <input> tag types.
+ * @param {Object} inputInfo Object containing the type and optionally min/max for range type inputs.
+ */
 function mapHtmlTypes(inputInfo){
   var htmlType;
   switch(inputInfo.type.toLowerCase()){
   case 'integer':
     htmlType = inputInfo.min != undefined ? 'range' : 'number';
+    if (htmlType === 'range') inputInfo.step = inputInfo.step || 1; // default range step size for integer
     break;
   case 'string':
     htmlType = 'text';
@@ -15,14 +20,18 @@ function mapHtmlTypes(inputInfo){
     break;
   case 'float':
     htmlType = inputInfo.min != undefined ? 'range' : 'text';
+    if (htmlType === 'range') inputInfo.step = inputInfo.step || 0.1; // default range step size for float
+    break;
+  case 'coordinate-input':
+    htmlType = 'button';
     break;
   default:
     htmlType = 'text';
     break;
   }
-  var response = inputInfo;
+  var response = Object.assign({}, inputInfo);
   response.type = htmlType;
   return response;
 }
 
-module.exports = mapHtmlTypes;
+module.exports = mapHtmlTypes;

examples/lib/scopeQuery.js

@@ -1,6 +1,7 @@
 /**
  * @method $scope
  * @param {"DOMNode"} scope A DOM Node as the scope
+ * @returns {Function} Constructor for the scopeSelector Object.
  */
 function $scope(scope) {
   return function(queryString){
@@ -24,6 +25,7 @@ function $scope(scope) {
 /**
  * @method $scopeAll
  * @param {"DOMNode"} scope A DOM Node as the scope
+ * @returns {Function} Constructor for the scopeSelectorAll Object.
  */
 function $scopeAll(scope){
   return function(queryString){
@@ -47,7 +49,8 @@ function $scopeAll(scope){
 /**
  * @method scopeSelector
  * @description A scoped jQuery selector
- * @param {"DOMNode"} scope DOM Node as the scope
+ * @param {"DOMNode"} scope A DOM Node as the scope
+ * @returns {Function}
  */
 function scopeSelector(scope){
   return $scope(scope);
@@ -56,7 +59,8 @@ function scopeSelector(scope){
 /**
  * @method scopeSelectorAll
  * @description A scoped jQuery multiple selector
- * @param {"DOMNode} scope DOM Node as the scope
+ * @param {"DOMNode} scope A DOM Node as the scope
+ * @returns {Function}
  */
 function scopeSelectorAll(scope){
   return $scopeAll(scope);

examples/lib/versionManagement.js

@@ -0,0 +1,43 @@
+/**
+ * Functions for getting version information.
+ * Note: these functions are not used by the service worker to check for updates;
+ * the service worker updates whenever sw.js has changed.
+ * sw.js is changed when grunt replace:version is run. This task is run during
+ * grunt build, serve, and productions tasks.
+ */
+
+const package = require('../../package.json');
+
+/**
+ * Get the current version number from package.json on the homepage.
+ * @param {function} callback The function that uses the version number.
+ */
+function getLatestVersionNumber(callback) {
+  // Get the homepage reference from the local package.json.
+  var homepage = package.homepage;
+  var request = new XMLHttpRequest();
+  request.onreadystatechange = function() {
+    if (request.readyState == 4 && request.status == 200) {
+      var response = JSON.parse(this.responseText);
+      var latestVersionNumber = response.version;
+
+      // Do something with the version number using a callback function.
+      if (callback)
+        callback(latestVersionNumber);
+    }
+  }
+
+  // Get the package.json file from online using a GET request.
+  request.open("GET", homepage + "/package.json", true);
+  request.send();
+}
+
+// Get the version number from the local package.json file.
+function getLocalVersionNumber() {
+  return package.version;
+}
+
+module.exports = {
+  getLatestVersionNumber,
+  getLocalVersionNumber
+}

examples/offline.html

@@ -0,0 +1,34 @@
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Error 502 | Bad Gateway</title>
+    <style>
+        body{
+            background-color:#d3d3d3;
+        }
+        p {
+            font-size:20px;
+        }
+        main {
+            display: flex;
+            flex-direction:column;
+            text-align: center;
+            justify-content: center;
+        }
+        a {
+            text-decoration: none;
+            color:blue;
+        }
+        
+    </style>
+</head>
+<body>
+    <main> 
+        <p>Error 502: something went wrong.</p>
+        <p>It seems that you are not connected to internet.<br>Please try after some time.</p>
+        <a href="/">Go To Home Page</a>
+    </main>
+</body>
+</html>

examples/sw.js

@@ -1,7 +1,14 @@
-const staticCacheName = 'image-sequencer-static-v3';
+const staticCacheName = 'image-sequencer-static-v3.6.0';
-
+self.addEventListener('install', function(e) {
-self.addEventListener('install', event => {
+  e.waitUntil(
-  console.log('Attempting to install service worker');
+    caches.open(staticCacheName).then(function(cache) {
+      console.log('Attempting to install service worker');
+      return cache.addAll([
+        '/',
+        '/examples/offline.html'
+      ]);
+    })
+  );
 });
 
 self.addEventListener('activate', function(e) {
@@ -22,14 +29,33 @@ self.addEventListener('activate', function(e) {
 
 self.addEventListener('fetch', function(event) {
   event.respondWith(
-    caches.open(staticCacheName).then(function(cache) {
+    // Try to fetch the latest data first.
-      return cache.match(event.request).then(function (response) {
+    fetch(event.request)
-        return response || fetch(event.request).then(function(response) {
+      .then(function(response) {
-          if(event.request.method == 'GET')
+        return caches.open(staticCacheName)
-            cache.put(event.request, response.clone());
+          .then(function(cache) {
-          return response;
+            if(event.request.method == 'GET'){
+              cache.put(event.request.url, response.clone());
+            }
+            return response;
+        })
+      })
+      .catch(function(err) {
+      // Now the request has been failed so show cached data.
+        return caches.match(event.request).then(function(res){
+          if (res === undefined) { 
+            // Display offline page
+            return caches.match('offline.html');
+          }
+          return res;
         });
-      });
     })
-  );
+  )
+});
+
+// When the update modal sends a 'skipWaiting' message, call the skipWaiting method.
+self.addEventListener('message', function(event) {
+  if(event.data.action === 'skipWaiting') {
+    self.skipWaiting();
+  }
 });

index.js

@@ -1,89 +1,5 @@
 #!/usr/bin/env node
 
-require('./src/ImageSequencer');
+var cli = require('./src/cli');
-sequencer = ImageSequencer({ ui: true });
-var fs = require('fs');
-var program = require('commander');
-var utils = require('./src/CliUtils');
 
-var saveSequence = require('./src/cli/saveSequence.js');
+cli(process.argv);
-var installModule = require('./src/cli/installModule.js');
-var sequencerSteps = require('./src/cli/sequencerSteps.js');
-
-function exit(message) {
-  console.error(message);
-  process.exit(1);
-}
-
-program
-  .version('0.1.0')
-  .option('-i, --image [PATH/URL]', 'Input image URL')
-  .option('-s, --step [step-name]', 'Name of the step to be added.')
-  .option('-o, --output [PATH]', 'Directory where output will be stored.')
-  .option('-b, --basic', 'Basic mode outputs only final image')
-  .option('-c, --config [Object]', 'Options for the step')
-  .option('--save-sequence [string]', 'Name space separated with Stringified sequence')
-  .option('--install-module [string]', 'Module name space seaprated npm package name')
-  .parse(process.argv);
-
-if (program.saveSequence) saveSequence(program, sequencer);
-
-else if (program.installModule) installModule(program, sequencer);
-
-else {
-  // Parse step into an array to allow for multiple steps.
-  if (!program.step) exit('No steps passed');
-  program.step = program.step.split(' ');
-
-  // User must input an image.
-  if (!program.image) exit('Can\'t read file.');
-
-  // User must input an image.
-  fs.access(program.image, function(err) {
-    if (err) exit('Can\'t read file.');
-  });
-
-  // User must input a step. If steps exist, check that every step is a valid step.
-  if (!program.step || !(utils.validateSteps(program.step, sequencer)))
-    exit('Please ensure all steps are valid.');
-
-  // If there's no user defined output directory, select a default directory.
-  program.output = program.output || './output/';
-
-  // Set sequencer to log module outputs, if any.
-  sequencer.setUI({
-    onComplete: function(step) {
-      // Get information of outputs.
-      step.info = sequencer.modulesInfo(step.name);
-
-      for (var output in step.info.outputs) {
-        console.log('[' + program.step + ']: ' + output + ' = ' + step[output]);
-      }
-    },
-    notify: function(msg) {
-      console.log('\x1b[36m%s\x1b[0m', '🌟  ' + msg);
-    }
-  });
-
-  // Finally, if everything is alright, load the image, add the steps and run the sequencer.
-  sequencer.loadImages(program.image, function() {
-    console.warn(
-      '\x1b[33m%s\x1b[0m',
-      'Please wait \n output directory generated will be empty until the execution is complete'
-    );
-
-    //Generate the Output Directory
-    var outputFilename = program.output.split('/').slice(-1)[0];
-    if (outputFilename.includes('.')) {
-      // user did give an output filename we have to remove it from dir
-      program.output = program.output.split('/').slice(0, -1).join('/');
-    }
-    else {
-      outputFilename = null;
-    }
-
-    sequencerSteps(program, sequencer, outputFilename);
-
-  });
-
-}

jest-puppeteer.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  launch: {
+    args: ['--no-sandbox', '--disable-setuid-sandbox'], // https://github.com/puppeteer/puppeteer/blob/main/docs/troubleshooting.md#setting-up-chrome-linux-sandbox
+    headless: process.env.HEADLESS !== 'false',
+  },
+  server: {
+    command: 'grunt serve',
+    port:3000,
+    launchTimeout: 5000000,
+  },
+  
+};

jest.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  preset: 'jest-puppeteer',
+  testRegex: './*\\.test\\.js$',
+  verbose: true,
+};
+

package.json

@@ -1,13 +1,19 @@
 {
   "name": "image-sequencer",
-  "version": "3.5.1",
+  "version": "3.6.0",
   "description": "A modular JavaScript image manipulation library modeled on a storyboard.",
   "main": "src/ImageSequencer.js",
   "scripts": {
     "debug": "TEST=true node ./index.js -i ./examples/images/monarch.png -s invert",
-    "test": "TEST=true istanbul cover tape test/core/*.js test/core/ui/user-interface.js test/core/modules/*.js | tap-spec; node test/core/sequencer/benchmark.js;  browserify test/core/sequencer/meta-modules.js test/core/sequencer/image-sequencer.js test/core/sequencer/chain.js  test/core/sequencer/replace.js test/core/sequencer/import-export.js test/core/sequencer/run.js test/core/sequencer/dynamic-imports.js test/core/util/*.js | tape-run --render=\"tap-spec\"",
+    "test": "TEST=true istanbul cover tape test/core/*.js test/core/ui/user-interface.js test/core/modules/*.js | tap-spec;",
+    "benchmark": "node test/core/sequencer/benchmark.js | tap-spec;",
+    "gif-test": "node test/core/gifs/gif-test.js | tap-spec;",
+    "core-tests": "cat ./output/core-tests.js | tape-run --render=\"tap-spec\"",
+    "test-all": "npm run test && npm run benchmark && npm run gif-test && grunt tests && npm run core-tests",
     "test-ui": "node node_modules/jasmine/bin/jasmine test/ui/spec/*.js",
-    "setup": "npm i && npm i -g grunt grunt-cli && grunt build",
+    "test-ui-2": "node ./node_modules/.bin/jest",
+    "test-cli": "node test/cli/*.js | tap-spec",
+    "setup": "npm i && npm i -g grunt grunt-cli && npm rebuild --build-from-source && grunt build",
     "start": "grunt serve"
   },
   "lint-staged": {
@@ -32,38 +38,41 @@
   "dependencies": {
     "atob": "^2.1.2",
     "base64-img": "^1.0.4",
-    "bootstrap": "~3.4.0",
+    "bootstrap": "^3.4.1",
     "bootstrap-colorpicker": "^2.5.3",
-    "buffer": "~5.4.0",
+    "buffer": "~6.0.2",
-    "commander": "^2.11.0",
+    "commander": "^7.0.0",
     "compressorjs": "^1.0.5",
-    "data-uri-to-buffer": "^2.0.0",
+    "data-uri-to-buffer": "^3.0.0",
     "downloadjs": "^1.4.7",
     "eslint": "^6.1.0",
+    "expr-eval": "^2.0.2",
     "fisheyegl": "^0.1.2",
     "font-awesome": "~4.7.0",
     "geotiff": "^1.0.0-beta.6",
     "get-pixels": "~3.3.0",
     "gifshot": "^0.4.5",
     "glfx": "0.0.4",
-    "gpu.js": "^2.0.0-rc.12",
+    "gpu.js": "^2.3.1",
     "image-sequencer-invert": "^1.0.0",
     "imagejs": "0.0.9",
-    "imagemin": "^7.0.0",
+    "imagemin": "^7.0.1",
-    "imagemin-jpegtran": "^6.0.0",
+    "imagemin-jpegtran": "^7.0.0",
-    "imagemin-pngquant": "^8.0.0",
+    "imagemin-pngquant": "^9.0.1",
     "imgareaselect": "git://github.com/jywarren/imgareaselect.git#v1.0.0-rc.2",
     "istanbul": "^0.4.5",
     "jasmine": "^3.4.0",
+    "jpegtran-bin": "^5.0.2",
     "jquery": "^3.3.1",
-    "jsdom": "^15.0.0",
+    "jsdom": "^16.3.0",
+    "jspdf": "^2.1.1",
     "jsqr": "^1.1.1",
     "lodash": "^4.17.11",
-    "matcher-core": "git@github.com:publiclab/matcher-core.git#matcher-node",
     "ndarray": "^1.0.18",
     "opencv.js": "^1.2.1",
-    "ora": "^3.0.0",
+    "ora": "^5.1.0",
     "pace": "0.0.4",
+    "pngquant-bin": "^6.0.0",
     "puppeteer": "^1.14.0",
     "qrcode": "^1.3.3",
     "readline-sync": "^1.4.7",
@@ -78,7 +87,7 @@
     "@babel/plugin-proposal-object-rest-spread": "^7.4.3",
     "@babel/plugin-syntax-object-rest-spread": "^7.2.0",
     "babelify": "^10.0.0",
-    "browserify": "16.2.3",
+    "browserify": "17.0.0",
     "eslint": "^6.1.0",
     "grunt": "^1.0.3",
     "grunt-browser-sync": "^2.2.0",
@@ -86,18 +95,22 @@
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-uglify-es": "^3.3.0",
     "grunt-contrib-watch": "^1.1.0",
-    "husky": "^2.2.0",
+    "grunt-text-replace": "^0.4.0",
+    "husky": "^3.0.5",
     "image-filter-core": "~2.0.2",
     "image-filter-threshold": "~2.0.1",
     "jasmine-core": "^3.3.0",
     "jasmine-jquery": "^2.1.1",
-    "jasmine-spec-reporter": "^4.2.1",
+    "jasmine-spec-reporter": "^6.0.0",
-    "lint-staged": "^9.1.0",
+    "jest": "^26.1.0",
+    "jest-puppeteer": "^4.3.0",
+    "lint-staged": "^10.0.3",
     "looks-same": "^7.0.0",
     "matchdep": "^2.0.0",
+    "resemblejs": "^3.2.5",
     "tap-spec": "^5.0.0",
-    "tape": "^4.9.2",
+    "tape": "^5.2.0",
-    "tape-run": "^6.0.0",
+    "tape-run": "^8.0.0",
     "uglify-es": "^3.3.7"
   },
   "husky": {

scripts/update-demo

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+scriptsDir=$(realpath $(dirname $0))
+
+echo -ne "Enter the repo to push to in the form username/repo (required): "
+read -e pushRepo
+
+echo -ne "Enter repo URL to pull from (upstream) in the form username/repo (default: publiclab/image-sequencer): "
+read -e repoInput
+
+echo -ne "Enter branch name (default: stable): "
+read -e branchInput
+
+echo -ne "Enter CNAME URL(default: none): "
+read -e cnameUrlInput
+
+tempDir=$(mktemp -d)
+pushd $tempDir > /dev/null
+
+git clone https://github.com/$pushRepo
+pushd image-sequencer > /dev/null
+
+$scriptsDir/update-gh-pages "$repoInput" "$branchInput" "$cnameUrlInput" "no warn"
+
+popd > /dev/null
+popd > /dev/null

scripts/update-gh-pages

@@ -0,0 +1,117 @@
+#!/bin/bash
+set -e # So that nothing wrong is published
+
+warn() {
+  echo -e "\033[1;31m
+------IMPORTANT------
+  THIS SCRIPT IS NOT MEANT TO BE USED DIRECTLY, PLEASE NEWLY CLONE THE REPO IN A SEPARATE DIRECTORY AND USE THE SCRIPT THERE.
+  USING THIS SCRIPT IN YOUR MAIN CLONE MAY DELETE YOUR LOCAL CHANGES.
+  This script is made to be reusable: If you want to manually update the demo, \
+  use the interactive script \`update-demo\`. This script can also be used in a github action.
+
+  You can set the 4th argument to anything to bypass this warning. \
+  Setting the 4th argument means that the first 3 arguments are also set which means that you know what you are doing (I assume).
+------IMPORTANT------
+\033[0m"
+
+  echo -ne "Do you still want to continue? [Y/n]: "
+  read -e yN
+
+  case $yN in
+    [yY][eE][sS] | [yY])
+    ;;
+    *)
+      exit 0
+    ;;
+  esac
+}
+
+# --- Constants ---
+deps="jquery bootstrap imgareaselect gifshot downloadjs selectize font-awesome bootstrap-colorpicker jspdf opencv.js/opencv.js" # A list of node_module dependencies to force commit
+# --- Constants ---
+
+# --- Arguments ---
+# $1: Repo(to use as upstream) url in the form username/repo (default: publiclab/image-sequencer) NOTE: Github only
+# $2: Branch to pull from eg: main or stable (default: stable)
+# $3: CNAME URL (default: none)
+# $4: Set the fourth argument to anything to bypass the warning.
+
+if [[ "$1" != "" ]];
+then
+  repo=$1
+else
+  repo="publiclab/image-sequencer"
+fi
+
+if [[ "$2" != "" ]];
+then
+  branch=$2
+else
+  branch="stable"
+fi
+
+if [[ "$3" != "" ]];
+then
+  CNAMEURL=$3
+else
+  CNAMEURL=""
+fi
+# --- Arguments ---
+
+# --- Main Script ---
+if [[ "$4" == "" ]]; # Set a 4th argument to anything to bypass this warning.
+then
+  warn
+fi
+
+git checkout gh-pages
+git remote add upstream https://github.com/$repo
+git fetch upstream
+
+git reset --hard upstream/$branch
+
+echo -e "Running setup script."
+npm run setup
+
+echo -e "Building dist files."
+grunt production
+
+if [ ! -f CNAME ];
+then
+  echo -e "Creating CNAME"
+  touch CNAME
+fi
+
+echo $CNAMEURL > CNAME
+
+echo -e "Removing unnecessary files."
+rm -R docs/
+rm -R test/
+rm CONTRIBUTING.md
+rm index.js
+
+echo -e "Copying important files from src/"
+cp src/ui/prepareDynamic.js prepareDynamic.js
+
+echo "Removing src/"
+rm -R src/
+mkdir -p src/ui/
+mv prepareDynamic.js src/ui/prepareDynamic.js
+
+echo -e "git add dist and node_modules dependencies."
+git add .
+
+for dep in $deps; # Force add node_modules dependencies
+do
+  git add -f node_modules/$dep
+done
+
+git add -f dist/image-sequencer.js
+git add -f dist/image-sequencer-ui.js
+
+echo -e "committing and pusing."
+git commit --no-verify -m "update"
+git push -f
+
+exit 0
+# --- Main Script ---

src/ImageSequencer.js

@@ -2,6 +2,11 @@ if (typeof window !== 'undefined') { isBrowser = true; }
 else { var isBrowser = false; }
 require('./util/getStep.js');
 
+/**
+ * @method ImageSequencer
+ * @param {Object|Float32Array} options Optional options
+ * @returns {Object}
+ */
 ImageSequencer = function ImageSequencer(options) {
 
   var str = require('./Strings.js')(this.steps, modulesInfo, addSteps, copy);
@@ -14,6 +19,12 @@ ImageSequencer = function ImageSequencer(options) {
     return Object.prototype.toString.call(object).split(' ')[1].slice(0, -1);
   }
 
+  /**
+   * @method log
+   * @description Logs colored messages to the console using ASCII color codes
+   * @param {String} color ASCII color code
+   * @param {String} msg Message to be logged to the console
+   */
   function log(color, msg) {
     if (options.ui != 'none') {
       if (arguments.length == 1) console.log(arguments[0]);
@@ -21,6 +32,12 @@ ImageSequencer = function ImageSequencer(options) {
     }
   }
 
+  /**
+   * @method copy
+   * @description Returns a clone of the input object.
+   * @param {Object|Float32Array} a The Object/Array to be cloned
+   * @returns {Object|Float32Array}
+   */
   function copy(a) {
     if (!typeof (a) == 'object') return a;
     if (objTypeOf(a) == 'Array') return a.slice();
@@ -53,10 +70,10 @@ ImageSequencer = function ImageSequencer(options) {
     for (o in sequencer) {
       modules[o] = sequencer[o];
     }
-    sequences = JSON.parse(window.localStorage.getItem('sequences'));
+    sequences = JSON.parse(window.localStorage.getItem('sequences')); // Get saved sequences from localStorage
     if (!sequences) {
       sequences = {};
-      window.localStorage.setItem('sequences', JSON.stringify(sequences));
+      window.localStorage.setItem('sequences', JSON.stringify(sequences)); // Set the localStorage entry as an empty Object by default
     }
   }
 
@@ -64,11 +81,16 @@ ImageSequencer = function ImageSequencer(options) {
   // if (options.imageSelect || options.inBrowser) addStep('image-select');
   // else if (options.imageUrl) loadImage(imageUrl);
 
+  /**
+   * @method addSteps
+   * @description Adds one of more steps to the sequence.
+   * @return {Object}
+   */
   function addSteps() {
     var this_ = (this.name == 'ImageSequencer') ? this : this.sequencer;
     var args = [];
     var json_q = {};
-    for (var arg in arguments) { args.push(copy(arguments[arg])); }
+    for (var arg in arguments) { args.push(copy(arguments[arg])); } // Get all the module names from the arguments
     json_q = formatInput.call(this_, args, '+');
 
     inputlog.push({ method: 'addSteps', json_q: copy(json_q) });
@@ -77,17 +99,28 @@ ImageSequencer = function ImageSequencer(options) {
     return this;
   }
 
+  /**
+   * @method removeStep
+   * @description Removes the step at the specified index from the sequence.
+   * @param {Object} ref ImageSequencer instance
+   * @param {Number} index Index of the step to be removed
+   * @returns {Null}
+   */
   function removeStep(ref, index) {
-    //remove the step from images[image].steps and redraw remaining images
+    // Remove the step from images[image].steps and redraw remaining images
     if (index > 0) {
-      //var this_ = (this.name == "ImageSequencer") ? this : this.sequencer;
+      // var this_ = (this.name == "ImageSequencer") ? this : this.sequencer;
       thisStep = ref.steps[index];
       thisStep.UI.onRemove(thisStep.options.step);
       ref.steps.splice(index, 1);
     }
-    //tell the UI a step has been removed
   }
 
+  /**
+   * @method removeSteps
+   * @description Removes one or more steps from the sequence
+   * @returns {Object}
+   */
   function removeSteps() {
     var   indices;
     var this_ = (this.name == 'ImageSequencer') ? this : this.sequencer;
@@ -103,6 +136,11 @@ ImageSequencer = function ImageSequencer(options) {
     return this;
   }
 
+  /**
+   * @method insertSteps
+   * @description Inserts steps at the specified index
+   * @returns {Object}
+   */
   function insertSteps() {
     var this_ = (this.name == 'ImageSequencer') ? this : this.sequencer;
     var args = [];
@@ -118,8 +156,11 @@ ImageSequencer = function ImageSequencer(options) {
     return this;
   }
 
-  // Config is an object which contains the runtime configuration like progress bar
+  /**
-  // information and index from which the sequencer should run
+   * @method run
+   * @param {Object} config Object which contains the runtime configuration like progress bar information and index from which the sequencer should run.
+   * @returns {Boolean}
+   */
   function run(config) {
     var progressObj, index = 0;
     config = config || { mode: 'no-arg' };
@@ -137,7 +178,7 @@ ImageSequencer = function ImageSequencer(options) {
     var callback = function() { };
     for (var arg in args)
       if (objTypeOf(args[arg]) == 'Function')
-        callback = args.splice(arg, 1)[0]; //callback is formed
+        callback = args.splice(arg, 1)[0]; // Callback is formed
 
     var json_q = formatInput.call(this_, args, 'r');
 
@@ -146,6 +187,11 @@ ImageSequencer = function ImageSequencer(options) {
     return true;
   }
 
+  /**
+   * @method loadImages
+   * @description Loads an image via dataURL or normal URL. Read the docs(https://github.com/publiclab/image-sequencer/blob/main/README.md) for more info.
+   * @returns {Null}
+   */
   function loadImages() {
     var args = [];
     var prevSteps = this.getSteps().slice(1).map(step=>step.options.name);
@@ -182,17 +228,35 @@ ImageSequencer = function ImageSequencer(options) {
 
   }
 
+  /**
+   * @method replaceImage
+   * @description Replaces the current image in the sequencer
+   * @param {String} selector DOM selector string for the image input
+   * @param {*} steps Current steps Object
+   * @param {Object} options
+   * @returns {*}
+   */
   function replaceImage(selector, steps, options) {
     options = options || {};
     options.callback = options.callback || function() { };
     return require('./ReplaceImage')(this, selector, steps, options);
   }
 
-  //returns the steps added
+  /**
+   * @method getSteps
+   * @description Returns the current sequence of steps
+   * @returns {Object}
+   */
   function getSteps(){
     return this.steps;
   }
 
+  /**
+   * @method setUI
+   * @description To set up a UI for ImageSequencer via different callback methods. Read the docs(https://github.com/publiclab/image-sequencer/blob/main/README.md) for more info.
+   * @param {Object} UI Object containing UI callback methods. Read the docs(https://github.com/publiclab/image-sequencer/blob/main/README.md) for more info.
+   * @returns {Null}
+   */
   function setUI(UI) {
     this.events = require('./ui/UserInterface')(UI);
   }
@@ -201,6 +265,12 @@ ImageSequencer = function ImageSequencer(options) {
     return require('./ExportBin')(dir, this, basic, filename);
   };
 
+  /**
+   * @method modulesInfo
+   * @description Returns information about the given module or all the available modules
+   * @param {String} name Module name
+   * @returns {Object}
+   */
   function modulesInfo(name) {
     var modulesdata = {};
     if (name == 'load-image') return {};
@@ -222,23 +292,30 @@ ImageSequencer = function ImageSequencer(options) {
     return modulesdata;
   }
 
+  /**
+   * @method loadNewModule
+   * @description Adds a new local module to sequencer. Read the docs(https://github.com/publiclab/image-sequencer/blob/main/README.md) for mode info.
+   * @param {String} name Name of the new module
+   * @param {Object} options An Object containing path and info about the new module.
+   * @returns {Object}
+   */
   function loadNewModule(name, options) {
 
     if (!options) {
       return this;
 
     } else if (Array.isArray(options)) {
-      // contains the array of module and info
+      // Contains the array of module and info
       this.modules[name] = options;
 
     } else if (options.func && options.info) {
-      // passed in options object
+      // Passed in options object
       this.modules[name] = [
         options.func, options.info
       ];
 
     } else if (options.path && !this.inBrowser) {
-      // load from path(only in node)
+      // Load from path(only in node)
       const module = [
         require(`${options.path}/Module.js`),
         require(`${options.path}/info.json`)
@@ -248,6 +325,13 @@ ImageSequencer = function ImageSequencer(options) {
     return this;
   }
 
+  /**
+   * @method saveNewModule
+   * @description Saves a new local module to ImageSequencer
+   * @param {String} name Name of the new module
+   * @param {String} path Path to the new module
+   * @returns {Null}
+   */
   function saveNewModule(name, path) {
     if (options.inBrowser) {
       // Not for browser context
@@ -258,6 +342,13 @@ ImageSequencer = function ImageSequencer(options) {
     fs.writeFileSync('./src/Modules.js', mods);
   }
 
+  /**
+   * @method saveSequence
+   * @description Saves a sequence on the browser localStorage.
+   * @param {String} name Name for the sequence
+   * @param {String} sequenceString Sequence data as a string
+   * @returns {Null}
+   */
   function saveSequence(name, sequenceString) { // 4. save sequence
     const sequence = str.stringToJSON(sequenceString);
     // Save the given sequence string as a module
@@ -276,7 +367,7 @@ ImageSequencer = function ImageSequencer(options) {
   }
 
   function loadModules() {
-    // This function loads the modules and saved sequences
+    // loadModules function loads the modules and saved sequences.
     this.modules = require('./Modules');
     if (options.inBrowser)
       this.sequences = JSON.parse(window.localStorage.getItem('sequences'));
@@ -286,7 +377,7 @@ ImageSequencer = function ImageSequencer(options) {
 
 
   return {
-    //literals and objects
+    // Literals and objects
     name: 'ImageSequencer',
     options: options,
     inputlog: inputlog,
@@ -296,7 +387,7 @@ ImageSequencer = function ImageSequencer(options) {
     steps: steps,
     image: image,
 
-    //user functions
+    // User functions
     loadImages: loadImages,
     loadImage: loadImages,
     addSteps: addSteps,
@@ -325,10 +416,11 @@ ImageSequencer = function ImageSequencer(options) {
     loadModules: loadModules,
     getSteps:getSteps,
 
-    //other functions
+    // Other functions
     log: log,
     objTypeOf: objTypeOf,
     copy: copy,
+    getImageDimensions: require('./util/getImageDimensions'),
 
     setInputStep: require('./ui/SetInputStep')(sequencer)
   };

src/Modules.js

@@ -11,8 +11,10 @@ module.exports = {
   'canvas-resize': require('./modules/CanvasResize'),
   'channel': require('./modules/Channel'),
   'colorbar': require('./modules/Colorbar'),
+  'color-halftone': require('./modules/ColorHalftone'),
   'color-temperature': require('./modules/ColorTemperature'),
   'colormap': require('./modules/Colormap'),
+  'constrained-crop': require('./modules/ConstrainedCrop'),
   'contrast': require('./modules/Contrast'),
   'convolution': require('./modules/Convolution'),
   'crop': require('./modules/Crop'),
@@ -29,9 +31,11 @@ module.exports = {
   'gradient': require('./modules/Gradient'),
   'grid-overlay': require('./modules/GridOverlay'),
   'import-image': require('./modules/ImportImage'),
+  'mask': require('./modules/Mask'),
   'minify-image': require('./modules/MinifyImage'),
-  'invert': require('image-sequencer-invert'),
+  // 'invert': require('image-sequencer-invert'), this code imports the invert module from a different repository altogether (using a require statement)
-  'matcher': require('./modules/Matcher'),
+  // Which is a powerful feature of ImageSequencer, the modules are independent of the rest of the library's source.
+  'invert': require('./modules/Invert'),
   'ndvi': require('./modules/Ndvi'),
   'ndvi-colormap': require('./modules/NdviColormap'),
   'noise-reduction': require('./modules/NoiseReduction'),
@@ -41,6 +45,7 @@ module.exports = {
   'resize': require('./modules/Resize'),
   'rotate': require('./modules/Rotate'),
   'saturation': require('./modules/Saturation'),
+  'shadow': require('./modules/Shadow'),
   'text-overlay': require('./modules/TextOverlay'),
   'threshold': require('./modules/Threshold'),
   'tint': require('./modules/Tint'),

src/Run.js

@@ -45,6 +45,8 @@ function Run(ref, json_q, callback, ind, progressObj) {
 
           // This output is accessible by UI
           ref.steps[i].options.step.output = ref.steps[i].output.src;
+          ref.steps[i].options.step.wasmSuccess = ref.steps[i].output.wasmSuccess || false;
+          ref.steps[i].options.step.useWasm = ref.steps[i].output.useWasm || false;
 
           // Tell UI that step has been drawn.
           ref.steps[i].UI.onComplete(ref.steps[i].options.step);

src/cli/index.js

@@ -0,0 +1,102 @@
+require('../ImageSequencer');
+sequencer = ImageSequencer({ ui: true });
+var fs = require('fs');
+var { Command } = require('commander');
+var utils = require('../CliUtils');
+
+var saveSequence = require('./saveSequence.js');
+var installModule = require('./installModule.js');
+var sequencerSteps = require('./sequencerSteps.js');
+
+function exit(message) {
+  console.error(message);
+  process.exit(1);
+}
+
+function executeSteps(program) {
+  // Set sequencer to log module outputs, if any.
+  sequencer.setUI({
+    onComplete: function (step) {
+      // Get information of outputs.
+      step.info = sequencer.modulesInfo(step.name);
+
+      for (var output in step.info.outputs) {
+        console.log('[' + program.step + ']: ' + output + ' = ' + step[output]);
+      }
+    },
+    notify: function (msg) {
+      console.log('\x1b[36m%s\x1b[0m', '🌟  ' + msg);
+    },
+  });
+
+  // Finally, if everything is alright, load the image, add the steps and run the sequencer.
+  sequencer.loadImages(program.image, function () {
+    console.warn(
+      '\x1b[33m%s\x1b[0m',
+      'Please wait \n output directory generated will be empty until the execution is complete'
+    );
+
+    //Generate the Output Directory
+    var outputFilename = program.output.split('/').slice(-1)[0];
+    if (outputFilename.includes('.')) {
+      // user did give an output filename we have to remove it from dir
+      program.output = program.output.split('/').slice(0, -1).join('/');
+    } else {
+      outputFilename = null;
+    }
+
+    sequencerSteps(program, sequencer, outputFilename);
+  });
+}
+
+function parseSteps(program) {
+  // Parse step into an array to allow for multiple steps.
+  if (!program.step) exit('No steps passed');
+  program.step = program.step.split(' ');
+
+  // User must input an image.
+  if (!program.image) exit('Can\'t read file.');
+
+  // User must input an image.
+  fs.access(program.image, function (err) {
+    if (err) exit('Can\'t read file.');
+  });
+
+  // User must input a step. If steps exist, check that every step is a valid step.
+  if (!program.step || !utils.validateSteps(program.step, sequencer))
+    exit('Please ensure all steps are valid.');
+
+  // If there's no user defined output directory, select a default directory.
+  program.output = program.output || './output/';
+
+  executeSteps(program);
+}
+
+function cli(args) {
+
+  let program = new Command();
+
+  program
+    .version('0.1.0')
+    .option('-i, --image [PATH/URL]', 'Input image URL')
+    .option('-s, --step [step-name]', 'Name of the step to be added.')
+    .option('-o, --output [PATH]', 'Directory where output will be stored.')
+    .option('-b, --basic', 'Basic mode outputs only final image')
+    .option('-c, --config [Object]', 'Options for the step')
+    .option(
+      '--save-sequence [string]',
+      'Name space separated with Stringified sequence'
+    )
+    .option(
+      '--install-module [string]',
+      'Module name space seaprated npm package name'
+    )
+    .parse(args);
+
+  const options = program.opts();
+  if (options.saveSequence) saveSequence(options, sequencer);
+  else if (options.installModule) installModule(options, sequencer);
+  else parseSteps(options);
+}
+
+module.exports = cli;

src/modules/AddQR/Module.js

@@ -1,46 +1,58 @@
+const _ = require('lodash'),
+  parseCornerCoordinateInputs = require('../../util/ParseInputCoordinates');
 module.exports = function AddQR(options, UI) {
 
   var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
-  options.size = options.size || defaults.size;
-  options.qrCodeString = options.qrCodeString || 'https://github.com/publiclab/image-sequencer';
   var output;
   getPixels = require('get-pixels');
 
   function draw(input, callback, progressObj) {
 
+    options.size = Number(options.size || defaults.size);
+    options.qrCodeString = options.qrCodeString || defaults.qrCodeString;
+    options.startingX = options.startingX || defaults.startingX;
+    options.startingY = options.startingY || defaults.startingY;
     progressObj.stop(true);
     progressObj.overrideFlag = true;
 
     var step = this;
 
-    return getPixels(input.src, function(err, oldPixels) {
+    function extraManipulation(pixels, setRenderState, generateOutput) {
-      function changePixel(r, g, b, a) {
+      let iw = pixels.shape[0], // Width of Original Image
-        return [r, g, b, a];
+        ih = pixels.shape[1]; // Height of Original Image
-      }
+      const oldPixels = _.cloneDeep(pixels);
+      setRenderState(false); // Prevent rendering of final output image until extraManipulation completes.
 
-      function extraManipulation(pixels, generateOutput) {
+      // Parse the inputs.
-        if (err) {
+      parseCornerCoordinateInputs({iw, ih},
-          console.log(err);
+        {
-          return;
+          startingX: { valInp: options.startingX, type: 'horizontal'},
-        }
+          startingY: { valInp: options.startingY, type: 'vertical' },
-        require('./QR')(options, pixels, oldPixels, generateOutput);
+        }, function(opt, cord){
-      }
+          options.startingX = Math.floor(cord.startingX.valInp);
-      function output(image, datauri, mimetype) {
+          options.startingY = Math.floor(cord.startingY.valInp);
-        step.output = { src: datauri, format: mimetype };
+        });
-      }
+
-      return require('../_nomodule/PixelManipulation.js')(input, {
+      require('./QR')(options, pixels, oldPixels, () => {
-        output: output,
+        setRenderState(true); // Allow rendering in the callback.
-        ui: options.step.ui,
+        generateOutput();
-        changePixel: changePixel,
-        extraManipulation: extraManipulation,
-        format: input.format,
-        image: options.image,
-        inBrowser: options.inBrowser,
-        callback: callback,
-        useWasm:options.useWasm
       });
-    });
+    }
 
+    function output(image, datauri, mimetype, wasmSuccess) {
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
+    }
+
+    return require('../_nomodule/PixelManipulation.js')(input, {
+      output: output,
+      ui: options.step.ui,
+      extraManipulation: extraManipulation,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback,
+      useWasm:options.useWasm
+    });
   }
 
   return {

src/modules/AddQR/QR.js

@@ -1,44 +1,37 @@
-module.exports = exports = function (options, pixels, oldPixels, callback) {
+const pixelSetter = require('../../util/pixelSetter.js'),
-  const pixelSetter = require('../../util/pixelSetter.js');
+  getPixels = require('get-pixels'),
+  QRCode = require('qrcode');
+module.exports = exports = function (options, pixels, oldPixels, cb) {
 
-  var QRCode = require('qrcode');
+  QRCode.toDataURL(options.qrCodeString, {width: options.size, scale: 1}, function (error, url) {
-  QRCode.toDataURL(options.qrCodeString, function (err, url) {
-    var getPixels = require('get-pixels');
     getPixels(url, function (err, qrPixels) {
       if (err) {
-        console.log('Bad image path', image);
+        console.log('get-pixels error: ', err);
       }
 
-      var imagejs = require('imagejs');
+      const width = oldPixels.shape[0],
-      var bitmap = new imagejs.Bitmap({ width: qrPixels.shape[0], height: qrPixels.shape[1] });
-      bitmap._data.data = qrPixels.data;
-      var resized = bitmap.resize({
-        width: options.size, height: options.size,
-        algorithm: 'bicubicInterpolation'
-      });
-
-      qrPixels.data = resized._data.data;
-      qrPixels.shape = [options.size, options.size, 4];
-      qrPixels.stride[1] = 4 * options.size;
-
-      var width = oldPixels.shape[0],
         height = oldPixels.shape[1];
-      var xe = width - options.size,
-        ye = height - options.size;
-      for (var m = 0; m < width; m++) {
-        for (var n = 0; n < height; n++) {
-          if (m >= xe && n >= ye) {
-            pixelSetter(m, n, [qrPixels.get(m - xe, n - ye, 0), qrPixels.get(m - xe, n - ye, 1), qrPixels.get(m - xe, n - ye, 2), qrPixels.get(m - xe, n - ye, 3)], pixels);
-          }
 
-          else {
+      const xe = Math.min(options.startingX, width - options.size), // Starting pixel coordinates
-            pixelSetter(m, n, [qrPixels.get(m, n, 0), qrPixels.get(m, n, 1), qrPixels.get(m, n, 2), qrPixels.get(m, n, 3)], pixels);
+        ye = Math.min(options.startingY, height - options.size);
-          }
 
+      for (let x = xe; x < Math.min(xe + options.size, width); x++) {
+        for (let y = ye; y < Math.min(ye + options.size, height); y++) {
+          pixelSetter(
+            x,
+            y,
+            [
+              qrPixels.get(x - xe, y - ye, 0),
+              qrPixels.get(x - xe, y - ye, 1),
+              qrPixels.get(x - xe, y - ye, 2),
+              qrPixels.get(x - xe, y - ye, 3)
+            ],
+            pixels
+          );
         }
       }
-      callback();
 
+      if(cb) cb();
     });
   });
 };

src/modules/AddQR/info.json

@@ -12,6 +12,16 @@
         "type": "string",
         "desc": "input string to generate QR code",
         "default": "https://github.com/publiclab/image-sequencer"
+      },
+      "startingX": {
+        "type": "string",
+        "desc": "X-position (measured from left) from where QR starts",
+        "default": "0"
+      },
+      "startingY": {
+        "type": "string",
+        "desc": "Y-position (measured from top) from where QR starts",
+        "default": "0"
       }
     },
     "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#add-qr-module"

src/modules/Average/Module.js

@@ -42,23 +42,19 @@ module.exports = function Average(options, UI) {
       // report back and store average in metadata:
       options.step.metadata.averages = sum;
 
-      // TODO: refactor into a new "display()" method as per https://github.com/publiclab/image-sequencer/issues/242
+      if (options.step.average === undefined) options.step.average = '';
-      if (options.step.inBrowser && options.step.ui) $(options.step.ui).find('.details').append('<p><b>Averages</b> (r, g, b, a): ' + sum.join(', ') + '</p>');
+      options.step.average += 'rgba(' + sum.join(', ') + ')';
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = {
-        src: datauri,
-        format: mimetype
-      };
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,
+      inBrowser: options.inBrowser,
       extraManipulation: extraManipulation,
       format: input.format,
       image: options.image,

src/modules/Average/info.json

@@ -3,5 +3,11 @@
     "description": "Average all pixel color",
     "inputs": {
     },
+    "outputs": {
+        "average": {
+            "type": "string",
+            "desc": "The average value of all the pixels."
+        }
+    },
     "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#average-module"
 }

src/modules/Blend/Module.js

@@ -1,9 +1,10 @@
-module.exports = function Dynamic(options, UI, util) {
+module.exports = function Blend(options, UI, util) {
 
   var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
 
-  options.func = options.func || defaults.blend;
+  options.func = options.blend || defaults.blend;
   options.offset = options.offset || defaults.offset;
+  options.blendMode = options.blendMode || defaults.blendMode;
 
   var output;
 
@@ -15,9 +16,6 @@ module.exports = function Dynamic(options, UI, util) {
 
     var step = this;
 
-    // convert to runnable code:
-    if (typeof options.func === 'string') eval('options.func = ' + options.func);
-
     var getPixels = require('get-pixels');
 
     // convert offset as string to int
@@ -32,26 +30,83 @@ module.exports = function Dynamic(options, UI, util) {
       callback();
     }
 
+    // see http://docs.gimp.org/en/gimp-concepts-layer-modes.html for other blend modes
+
+    const multiply_mode = function (i, m) {
+      return ~~( (i * m) / 255 );
+    };
+    const divide_mode = function (i, m) {
+      return ~~( (256 * i) / (m + 1) );
+    };
+
+    const overlay_mode = function (i, m) {
+      return ~~( (i / 255) * (i + ((2 * m) / 255) * (255 - i)) );
+    };
+    
+    const screen_mode = function (i, m) {
+      return ~~( 255 - ((255 - m) * (255 - i)) / 255 );
+    };
+    
+    const sof_light_mode = function (i, m) {
+      var Rs = screen_mode(i, m);
+      return ~~( ((((255 - i) * m) + Rs) * i) / 255 );
+    };
+    
+    const color_dodge = function (i, m) {
+      return ~~( (256 * i) / (255 - m + 1) );
+    };
+
+    const burn_mode = function (i, m) {
+      return ~~( 255 - (256 * (255 - i)) / (m + 1));
+    };
+
+    const grain_extract_mode = function (i, m) {
+      return ~~( i - m + 128 );
+    };
+
+    const grain_merge_mode = function (i, m) {
+      return ~~( i + m - 128 );
+    };
+
+    
     getPixels(priorStep.output.src, function(err, pixels) {
       options.firstImagePixels = pixels;
 
+      // Convert to runnable code.
+      if (typeof options.func === 'string') eval('options.func = ' + options.func);
+      
       function changePixel(r2, g2, b2, a2, x, y) {
         // blend!
         let p = options.firstImagePixels;
-        return options.func(
+        let r1 = p.get(x, y, 0),
-          r2, g2, b2, a2,
+          g1 = p.get(x, y, 1),
-          p.get(x, y, 0),
+          b1 = p.get(x, y, 2),
-          p.get(x, y, 1),
+          a1 = p.get(x, y, 3);
-          p.get(x, y, 2),
+
-          p.get(x, y, 3)
+        const blends = {
-        );
+          'Color Dodge': () => [color_dodge(r2, r1), color_dodge(g2, g1), color_dodge(b2, b1), 255],
+          'Multiply': () => [multiply_mode(r2, r1), multiply_mode(g2, g1), multiply_mode(b2, b1), multiply_mode(a2, a1)],
+          'Divide': () => [divide_mode(r2, r1), divide_mode(g2, g1), divide_mode(b2, b1), 255],
+          'Overlay': () => [overlay_mode(r2, r1), overlay_mode(g2, g1), overlay_mode(b2, b1), 255],
+          'Screen': () => [screen_mode(r2, r1), screen_mode(g2, g1), screen_mode(b2, b1), 255],
+          'Soft Light': () => [sof_light_mode(r2, r1), sof_light_mode(g2, g1), sof_light_mode(b2, b1), 255],
+          'Color Burn': () => [burn_mode(r2, r1), burn_mode(g2, g1), burn_mode(b2, b1), 255],
+          'Grain Extract': () => [grain_extract_mode(r2, r1), grain_extract_mode(g2, g1), grain_extract_mode(b2, b1), 255],
+          'Grain Merge': () => [grain_merge_mode(r2, r1), grain_merge_mode(g2, g1), grain_merge_mode(b2, b1), 255]
+        };
+        
+        if(options.blendMode == 'custom')
+          return options.func(
+            r2, g2, b2, a2, r1, g1, b1, a1
+          );
+        else {
+          return blends[options.blendMode]();
+        }
+
       }
 
-      function output(image, datauri, mimetype) {
+      function output(image, datauri, mimetype, wasmSuccess) {
-
+        step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-        // This output is accessible by Image Sequencer
-        step.output = { src: datauri, format: mimetype };
-
       }
 
       // run PixelManipulatin on second image's pixels

src/modules/Blend/info.json

@@ -1,17 +1,34 @@
 {
   "name": "blend",
-  "description": "Blend two chosen image steps with the given function. Defaults to using the red channel from image 1 and the green and blue and alpha channels of image 2. Easier to use interfaces coming soon!",
+  "description": "Blend two chosen image steps with the given function. Defaults to using the red channel from image 1 and the green and blue and alpha channels of image 2.",
   "inputs": {
     "offset": {
       "type": "integer",
       "desc": "Choose which image to blend the current image with. Two steps back is -2, three steps back is -3 etc.",
       "default": -2
     },
+    "blendMode": {
+      "type": "select",
+      "desc": "Name of the Blend Mode to use",
+      "default": "custom",
+      "values": [
+        "custom",
+        "Multiply",
+        "Divide",
+        "Overlay",
+        "Screen",
+        "Soft Light",
+        "Color Burn",
+        "Color Dodge",
+        "Grain Extract",
+        "Grain Merge"
+      ]
+    },
     "blend": {
       "type": "string",
       "desc": "Function to use to blend the two images.",
-      "default": "function(r1, g1, b1, a1, r2, g2, b2, a2) { return [ r1, g2, b2, a2 ] }"
+      "default": "function(r1, g1, b1, a1, r2, g2, b2, a2, x, y) { return [ r2, g2, b2, a2 ] }"
     }
   },
-  "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#blend-module"
+  "docs-link": "https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#blend-module"
 }

src/modules/BlobAnalysis/BlobAnalysis.js

@@ -1,17 +1,10 @@
-module.exports = function(pixels, options, priorStep){
+module.exports = function(pixels){
-
-  var $ = require('jquery'); // to make Blob-analysis work for node.js
-  
-  var img = $(priorStep.imgElement);
-  if(Object.keys(img).length === 0){
-    img = $(priorStep.options.step.imgElement);
-  }
-
   var canvas = document.createElement('canvas');
   canvas.width = pixels.shape[0];
   canvas.height = pixels.shape[1];
   var ctx = canvas.getContext('2d');
-  ctx.drawImage(img[0], 0, 0);
+  ctx.putImageData(new ImageData(new Uint8ClampedArray(pixels.data), pixels.shape[0], pixels.shape[1]), 0, 0);
+  
   let imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
 
 
@@ -25,26 +18,26 @@ module.exports = function(pixels, options, priorStep){
   let unknown = new cv.Mat();
   let markers = new cv.Mat();
  
-  // gray and threshold image
+  // Gray and Threshold the image
   cv.cvtColor(src, gray, cv.COLOR_RGBA2GRAY, 0);
   cv.threshold(gray, gray, 0, 255, cv.THRESH_BINARY_INV + cv.THRESH_OTSU);
  
-  // get background
+  // Get background
   let M = cv.Mat.ones(3, 3, cv.CV_8U);
   cv.erode(gray, gray, M);
   cv.dilate(gray, opening, M);
   cv.dilate(opening, imageBg, M, new cv.Point(-1, -1), 3);
  
-  // distance transform
+  // Distance transform
   cv.distanceTransform(opening, distTrans, cv.DIST_L2, 5);
   cv.normalize(distTrans, distTrans, 1, 0, cv.NORM_INF);
  
-  // get foreground
+  // Get foreground
   cv.threshold(distTrans, imageFg, 0.7 * 1, 255, cv.THRESH_BINARY);
   imageFg.convertTo(imageFg, cv.CV_8U, 1, 0);
   cv.subtract(imageBg, imageFg, unknown);
  
-  // get connected components markers
+  // Get connected components markers
   cv.connectedComponents(imageFg, markers);
   for (let i = 0; i < markers.rows; i++) {
     for (let j = 0; j < markers.cols; j++) {
@@ -58,13 +51,13 @@ module.exports = function(pixels, options, priorStep){
   cv.cvtColor(src, src, cv.COLOR_RGBA2RGB, 0);
   cv.watershed(src, markers);
  
-  // draw barriers
+  // Grow barriers
   for (let i = 0; i < markers.rows; i++) {
     for (let j = 0; j < markers.cols; j++) {
       if (markers.intPtr(i, j)[0] == -1) {
-        src.ucharPtr(i, j)[0] = 255; // R
+        src.ucharPtr(i, j)[0] = 255; // Red
-        src.ucharPtr(i, j)[1] = 0; // G
+        src.ucharPtr(i, j)[1] = 0; // Green
-        src.ucharPtr(i, j)[2] = 0; // B
+        src.ucharPtr(i, j)[2] = 0; // Blue
       }
     }
   }
@@ -78,4 +71,4 @@ module.exports = function(pixels, options, priorStep){
   pixels.data = myImageData.data;
  
   return pixels;
-};
+};

src/modules/BlobAnalysis/Module.js

@@ -10,17 +10,14 @@ module.exports = function BlobAnalysis(options, UI){
   
     var step = this;
 
-    var priorStep = this.getStep(-1); // get the previous step to process it
-
     function extraManipulation(pixels){
   
-      pixels = require('./BlobAnalysis')(pixels, options, priorStep);
+      pixels = require('./BlobAnalysis')(pixels);
       return pixels;
     }
   
-    function output(image, datauri, mimetype){
+    function output(image, datauri, mimetype, wasmSuccess) {
-  
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype};
     }
   
     return require('../_nomodule/PixelManipulation.js')(input, {
@@ -40,4 +37,4 @@ module.exports = function BlobAnalysis(options, UI){
     output: output,
     UI: UI
   };
-};
+};

src/modules/BlobAnalysis/info.json

@@ -2,5 +2,6 @@
     "name": "Blob Analysis",
     "description": "Blob/Region identification for microscopic images.",
     "inputs": {},
+    "requires": ["webgl", "browser"],
     "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#blob-analysis"
 }

src/modules/Blur/Blur.js

@@ -1,8 +1,36 @@
+// Generates a 5x5 Gaussian kernel
+function kernelGenerator(sigma = 1) {
+
+  let kernel = [],
+    sum = 0;
+
+  if (sigma == 0) sigma += 0.05;
+
+  const s = 2 * Math.pow(sigma, 2);
+
+  for (let y = -2; y <= 2; y++) {
+    kernel.push([]);
+    for (let x = -2; x <= 2; x++) {
+      let r = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
+      kernel[y + 2].push(Math.exp(-(r / s)));
+      sum += kernel[y + 2][x + 2];
+    }
+  }
+
+  for (let x = 0; x < 5; x++){
+    for (let y = 0; y < 5; y++){
+      kernel[y][x] = (kernel[y][x] / sum);
+    }
+  }
+
+  return kernel;
+}
+
 module.exports = exports = function(pixels, blur) {
   const pixelSetter = require('../../util/pixelSetter.js');
 
-  let kernel = kernelGenerator(blur),
+  let kernel = kernelGenerator(blur), // Generate the Gaussian kernel based on the sigma input.
-    pixs = {
+    pixs = { // Separates the rgb channel pixels to convolve on the GPU.
       r: [],
       g: [],
       b: [],
@@ -20,46 +48,18 @@ module.exports = exports = function(pixels, blur) {
     }
   }
 
-  const convolve = require('../_nomodule/gpuUtils').convolve;
+  const convolve = require('../_nomodule/gpuUtils').convolve; // GPU convolution function.
 
-  const conPix = convolve([pixs.r, pixs.g, pixs.b], kernel);
+  const conPix = convolve([pixs.r, pixs.g, pixs.b], kernel); // Convolves the pixels (all channels separately) on the GPU.
 
   for (let y = 0; y < pixels.shape[1]; y++){
     for (let x = 0; x < pixels.shape[0]; x++){
       var pixelvalue = [Math.max(0, Math.min(conPix[0][y][x], 255)),
         Math.max(0, Math.min(conPix[1][y][x], 255)),
         Math.max(0, Math.min(conPix[2][y][x], 255))];
-      pixelSetter(x, y, pixelvalue, pixels);
+      pixelSetter(x, y, pixelvalue, pixels); // Sets the image pixels according to the blurred values.
     }
   }
 
   return pixels;
-
+};
-  //Generates a 5x5 Gaussian kernel
-  function kernelGenerator(sigma = 1) {
-
-    let kernel = [],
-      sum = 0;
-
-    if (sigma == 0) sigma += 0.05;
-
-    const s = 2 * Math.pow(sigma, 2);
-
-    for (let y = -2; y <= 2; y++) {
-      kernel.push([]);
-      for (let x = -2; x <= 2; x++) {
-        let r = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
-        kernel[y + 2].push(Math.exp(-(r / s)));
-        sum += kernel[y + 2][x + 2];
-      }
-    }
-
-    for (let x = 0; x < 5; x++){
-      for (let y = 0; y < 5; y++){
-        kernel[y][x] = (kernel[y][x] / sum);
-      }
-    }
-
-    return kernel;
-  }
-};

src/modules/Blur/Module.js

@@ -20,16 +20,14 @@ module.exports = function Blur(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,
+      inBrowser: options.inBrowser,
       extraManipulation: extraManipulation,
       format: input.format,
       image: options.image,

src/modules/Brightness/Module.js

@@ -31,11 +31,8 @@ module.exports = function Brightness(options, UI) {
       return [r, g, b, a];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/CanvasResize/Module.js

@@ -35,11 +35,8 @@ module.exports = function canvasResize(options, UI) {
       return newPixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/CanvasResize/info.json

@@ -22,5 +22,6 @@
             "desc": "Y-cord of the top left corner of the image on the canvas",
             "default": 500
         }
-    }
+    },
+    "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#canvas-resize-module"
 }

src/modules/Channel/Module.js

@@ -22,11 +22,8 @@ module.exports = function Channel(options, UI) {
       if (options.channel === 'blue') return [0, 0, b, a];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accesible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/ColorHalftone/Module.js

@@ -0,0 +1,135 @@
+/*
+* Generate halftone versions of CMYK channels and blend them with varying rotations as in analog print color separation processes.
+* Simulates a CMYK halftone rendering of the image by multiplying pixel values with a four rotated 2D sine wave patterns, one each for cyan, magenta, yellow, and black.
+* http://evanw.github.io/glfx.js/docs/#colorHalftone
+*/
+module.exports = function ColorHalftone(options, UI) {
+
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+
+  var output;
+  var fx = require('glfx');
+
+  var dataURItoBlob = function dataURItoBlob(dataURI) {
+    // convert base64/URLEncoded data component to raw binary data held in a string
+    var byteString;
+    if (dataURI.split(',')[0].indexOf('base64') >= 0)
+      byteString = atob(dataURI.split(',')[1]);
+    else
+      byteString = unescape(dataURI.split(',')[1]);
+
+    // separate out the mime component
+    var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
+
+    // write the bytes of the string to a typed array
+    var ia = new Uint8Array(byteString.length);
+    for (var i = 0; i < byteString.length; i++) {
+      ia[i] = byteString.charCodeAt(i);
+    }
+
+    return new Blob([ia], { type: mimeString });
+  };
+
+  var canvasToBlobUrl = function canvasToBlobUrl(canvas) {
+
+    var blob = dataURItoBlob(canvas.toDataURL('image/png'));
+    return window.URL.createObjectURL(blob);
+
+  };
+
+  var colorHalftone = function colorHalftone(id, options, download) {
+
+    // try to create a WebGL canvas (will fail if WebGL isn't supported)
+    try {
+      var canvas = fx.canvas(1500, 1500);
+    } catch (e) {
+      alert(e);
+      return;
+    }
+
+    // convert the image to a texture
+    var imageEl = document.getElementById(id);
+
+    var image = new Image();
+
+    image.onload = function() {
+
+      var texture = canvas.texture(image);
+
+      canvas.draw(texture,
+        image.width, //  * ratio,
+        image.height// * ratio
+      );
+
+      canvas.colorHalftone(
+        image.width / 2,
+        image.height / 2,
+        parseFloat(options.angle),
+        parseFloat(options.size)
+      ).update();
+
+      var burl = canvasToBlobUrl(canvas);
+
+      if (download) {
+
+        window.open(burl);
+
+      } else { // replace the image
+
+        // keep non-blob version in case we have to fall back:
+        // image.src = canvas.toDataURL('image/png');
+        // window.location = canvas.toDataURL('image/png');
+        imageEl.src = burl;
+
+      }
+
+    };
+
+    $(image).hide();
+    image.src = imageEl.src;
+
+  };
+
+  function draw(input, callback) {
+
+    var step = this;
+
+    options.angle = options.angle || defaults.angle;
+    options.size = options.size || defaults.size;
+
+    if (!options.inBrowser) {
+      // this.output = input;
+      // callback();
+      require('../_nomodule/gl-context')(input, callback, step, options);
+    }
+    else {
+      var image = document.createElement('img');
+      image.onload = () => {
+        colorHalftone(
+          'img',
+          options
+        );
+        image.onload = () => {
+          var canvas = document.createElement('canvas');
+          canvas.width = image.naturalWidth; // or 'width' if you want a special/scaled size
+          canvas.height = image.naturalHeight; // or 'height' if you want a special/scaled size
+          canvas.getContext('2d').drawImage(image, 0, 0);
+
+          step.output = { src: canvas.toDataURL('image/png'), format: 'png' };
+          image.remove();
+          callback();
+        };
+      };
+      image.src = input.src;
+      image.id = 'img';
+      document.body.appendChild(image);
+    }
+  }
+
+  return {
+    options: options,
+    draw: draw,
+    output: output,
+    UI: UI
+  };
+};

src/modules/ColorHalftone/index.js

@@ -1,4 +1,4 @@
 module.exports = [
   require('./Module'),
   require('./info.json')
-];
+];

src/modules/ColorHalftone/info.json

@@ -0,0 +1,23 @@
+{
+    "name": "color-halftone",
+    "requires": ["webgl"],
+    "description": "Generate halftone versions of CMYK channels and blend them with varying rotations as in analog print color separation processes.",
+    "inputs": {
+        "angle": {
+            "type": "float",
+            "desc": "angle of rotation of the halftone patterns in radians",
+            "default": "0.25",
+            "min": "0",
+            "max": "1.57",
+            "step": "0.05"
+        },
+        "size": {
+            "type": "integer",
+            "desc": "the diameter of a dot in pixels",
+            "default": "4",
+            "min": "3",
+            "max": "20"
+        }
+    },
+    "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#color-halftone-module"
+}

src/modules/ColorTemperature/Module.js

@@ -1,12 +1,15 @@
 module.exports = function ColorTemperature(options, UI) {
   
   const pixelSetter = require('../../util/pixelSetter.js');
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
 
   var output;
 
   function draw(input, callback, progressObj) {
 
-    options.temperature = (options.temperature > '40000') ? '40000' : options.temperature;
+    options.temperature = options.temperature || defaults.temperature;
+    options.temperature = (options.temperature > 40000) ? 40000 : options.temperature;
+    options.temperature = (options.temperature < 0) ? 0 : options.temperature;
 
     progressObj.stop(true);
     progressObj.overrideFlag = true;
@@ -52,10 +55,8 @@ module.exports = function ColorTemperature(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/Colorbar/Module.js

@@ -1,12 +1,12 @@
 module.exports = require('../../util/createMetaModule.js')(
   function mapFunction(options) {
-
+    var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
     // return steps with options:
     return [
       { 'name': 'gradient', 'options': {} },
-      { 'name': 'colormap', 'options': { colormap: options.colormap } },
+      { 'name': 'colormap', 'options': { colormap: options.colormap || defaults.colormap } },
-      { 'name': 'crop', 'options': { 'y': 0, 'h': options.h } },
+      { 'name': 'crop', 'options': { 'y': 0, 'w': '100%', 'h': options.h || defaults.h } },
-      { 'name': 'overlay', 'options': { 'x': options.x, 'y': options.y, 'offset': -4 } }
+      { 'name': 'overlay', 'options': { 'x': options.x || defaults.x, 'y': options.y || defaults.y, 'offset': -4 }  }
     ];
   }, {
     infoJson: require('./info.json')

src/modules/Colormap/Colormap.js

@@ -12,7 +12,8 @@
  */
 
 module.exports = function Colormap(value, options) {
-  options.colormap = options.colormap || colormaps.default;
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+  options.colormap = options.colormap || defaults.colormap;
   // if a lookup table is provided as an array:
   if(typeof(options.colormap) == 'object')
     colormapFunction = colormap(options.colormap);

src/modules/Colormap/Module.js

@@ -16,12 +16,10 @@ module.exports = function Colormap(options, UI) {
       return [res[0], res[1], res[2], 255];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
+    
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,

src/modules/ConstrainedCrop/Module.js

@@ -0,0 +1,56 @@
+/*
+* Crops an Image on the basis of the ratio provided
+*/
+module.exports = function ConstrainedCrop(options, UI) {
+
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+  var output;
+
+  function draw(input, callback) {
+
+    var step = this,
+      startingX = Number(options.startingX || defaults.startingX),
+      startingY = Number(options.startingY || defaults.startingY),
+      aspectRatio = (options.aspectRatio || defaults.aspectRatio).split(':'),
+      widthRatio = Number(aspectRatio[0]),
+      heightRatio = Number(aspectRatio[1]);
+
+    function extraManipulation(pixels) {
+      var width = pixels.shape[0],
+        height = pixels.shape[1];
+      var endX, endY;
+      if(((width - startingX) / widthRatio) * heightRatio <= (height - startingY)) {
+        endX = width;
+        endY = (((width - startingX) / widthRatio) * heightRatio) + startingY;
+      }
+      else {
+        endX = (((height - startingY) / heightRatio) * widthRatio) + startingX;
+        endY = height;
+      }
+      const newPixels = require('../Crop/Crop')(pixels, {'x': startingX, 'y': startingY, 'w': endX - startingX, 'h': endY - startingY}, function() {
+      });
+      return newPixels;
+    }
+
+
+    function output(image, datauri, mimetype, wasmSuccess) {
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
+    }
+    return require('../_nomodule/PixelManipulation')(input, {
+      output: output,
+      ui: options.step.ui,
+      extraManipulation: extraManipulation,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback,
+      useWasm:options.useWasm
+    });
+  }
+  return {
+    options: options,
+    draw: draw,
+    output: output,
+    UI: UI
+  };
+};

src/modules/ConstrainedCrop/index.js

@@ -0,0 +1,4 @@
+module.exports = [
+  require('./Module'),
+  require('./info.json')
+];

src/modules/ConstrainedCrop/info.json

@@ -0,0 +1,23 @@
+{
+    "name": "constrained-crop",
+    "description": "Crops an image in a particular aspect-ratio",
+    "inputs": {
+      "startingX": {
+        "type": "integer",
+        "desc": "X-position (measured from left) from where cropping starts",
+        "default": 0
+      },
+      "startingY": {
+        "type": "integer",
+        "desc": "Y-position (measured from top) from where cropping starts",
+        "default": 0
+      },
+      "aspectRatio":{
+        "type": "string",
+        "desc": "Enter aspect ratio in following format width:height",
+        "default": "1:1"
+      }
+    },
+   "docs-link":""
+  }
+  

src/modules/Contrast/Contrast.js

@@ -1,30 +0,0 @@
-var _ = require('lodash');
-const pixelSetter = require('../../util/pixelSetter.js');
-
-module.exports = exports = function(pixels, contrast) {
-  let oldpix = _.cloneDeep(pixels);
-  contrast = Number(contrast);
-  if (contrast < -100) contrast = -100;
-  if (contrast > 100) contrast = 100;
-  contrast = (100.0 + contrast) / 100.0;
-  contrast *= contrast;
-
-  for (let i = 0; i < pixels.shape[0]; i++) {
-    for (let j = 0; j < pixels.shape[1]; j++) {
-            
-      var rgbarray = [oldpix.get(i, j, 0) / 255.0, oldpix.get(i, j, 1) / 255.0, oldpix.get(i, j, 2) / 255.0];
-      for(var idx = 0;idx < 3;idx++){
-        rgbarray[idx] -= 0.5;
-        rgbarray[idx] *= contrast;
-        rgbarray[idx] += 0.5;
-        rgbarray[idx] *= 255;
-        if (rgbarray[idx] < 0) rgbarray[idx] = 0;
-        if (rgbarray[idx] > 255) rgbarray[idx] = 255;
-      }
-            
-      pixelSetter(i, j, rgbarray, pixels);
-            
-    }
-  }
-  return pixels;
-};

src/modules/Contrast/Module.js

@@ -15,25 +15,41 @@ module.exports = function Contrast(options, UI) {
 
     var step = this;
 
-    function extraManipulation(pixels) {
+    let contrast = options.contrast;
-      pixels = require('./Contrast')(pixels, options.contrast);
+
-      return pixels;
+    contrast = Number(contrast);
+    if (contrast < -100) contrast = -100;
+    if (contrast > 100) contrast = 100;
+    contrast = (100.0 + contrast) / 100.0;
+    contrast *= contrast;
+
+    function changeContrast(p){
+      p -= 0.5;
+      p *= contrast;
+      p += 0.5;
+      p *= 255;
+      p = Math.max(0, p);
+      p = Math.min(p, 255);
+      return p;
     }
 
-    function output(image, datauri, mimetype) {
+    function changePixel(r, g, b, a) {
-
+      
-      // This output is accessible by Image Sequencer
+      return [changeContrast(r / 255), changeContrast(g / 255), changeContrast(b / 255), a];
-      step.output = { src: datauri, format: mimetype };
+    }
 
+    function output(image, datauri, mimetype, wasmSuccess) {
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,
-      extraManipulation: extraManipulation,
+      changePixel: changePixel,
       format: input.format,
       image: options.image,
       callback: callback,
+      inBrowser: options.inBrowser,
       useWasm:options.useWasm
     });
 

src/modules/Convolution/Module.js

@@ -19,10 +19,8 @@ module.exports = function Convolution(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
@@ -31,6 +29,7 @@ module.exports = function Convolution(options, UI) {
       extraManipulation: extraManipulation,
       format: input.format,
       image: options.image,
+      inBrowser: options.inBrowser,
       callback: callback,
       useWasm:options.useWasm
     });

src/modules/Crop/Crop.js

@@ -1,61 +1,71 @@
-module.exports = function Crop(input, options, callback) {
+const ndarray = require('ndarray'),
+  pixelSetter = require('../../util/pixelSetter'),
+  parseCornerCoordinateInputs = require('../../util/ParseInputCoordinates');
+
+module.exports = function Crop(pixels, options, cb) {
   var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
-  var getPixels = require('get-pixels'),
+  options.x = options.x || defaults.x;
-    savePixels = require('save-pixels');
+  options.y = options.y || defaults.y;
 
-  options.x = parseInt(options.x) || defaults.x;
+  options.w = options.w || defaults.w;
-  options.y = parseInt(options.y) || defaults.y;
+  options.h = options.h || defaults.h;
 
-  getPixels(input.src, function(err, pixels){
+  options.backgroundColor = options.backgroundColor || defaults.backgroundColor;
-    options.w = parseInt(options.w) || Math.floor(pixels.shape[0]);
-    options.h = parseInt(options.h) || Math.floor(pixels.shape[1]);
-    options.backgroundColor = options.backgroundColor || defaults.backgroundColor;
-    var ox = options.x;
-    var oy = options.y;
-    var w = options.w;
-    var h = options.h;
-    var iw = pixels.shape[0]; //Width of Original Image
-    var ih = pixels.shape[1]; //Height of Original Image
-    var backgroundArray = [];
-    backgroundColor = options.backgroundColor.substring(options.backgroundColor.indexOf('(') + 1, options.backgroundColor.length - 1); // extract only the values from rgba(_,_,_,_)
-    backgroundColor = backgroundColor.split(',');
-    for(var i = 0; i < w ; i++){
-      backgroundArray = backgroundArray.concat([backgroundColor[0], backgroundColor[1], backgroundColor[2], backgroundColor[3]]);
-    }
-    // var newarray = new Uint8Array(4*w*h);
-    var array = [];
-    for (var n = oy; n < oy + h; n++) {
-      var offsetValue = 4 * w * n;
-      if(n < ih){
-        var start = n * 4 * iw + ox * 4;
-        var end = n * 4 * iw + ox * 4 + 4 * w;
-        var pushArray = Array.from(pixels.data.slice(start, end ));
-        array.push.apply(array, pushArray);
-      } else {
-        array.push.apply(array, backgroundArray);
-      }
-    }
-    
-    var newarray = Uint8Array.from(array);
-    pixels.data = newarray;
-    pixels.shape = [w, h, 4];
-    pixels.stride[1] = 4 * w;
 
-    options.format = input.format;
+  const bg = options.backgroundColor.replace('rgba', '').replace('(', '').replace(')', '').split(',');
 
-    var chunks = [];
+  let iw = pixels.shape[0], // Width of Original Image
-    var totalLength = 0;
+    ih = pixels.shape[1], // Height of Original Image
-    var r = savePixels(pixels, options.format);
+    offsetX,
+    offsetY,
+    w,
+    h;
 
-    r.on('data', function(chunk){
+  // Parse the inputs
-      totalLength += chunk.length;
+  parseCornerCoordinateInputs({iw, ih},
-      chunks.push(chunk);
+    {
+      x: { valInp: options.x, type: 'horizontal' },
+      y: { valInp: options.y, type: 'vertical' },
+      w: { valInp: options.w, type: 'horizontal' },
+      h: { valInp: options.h, type: 'vertical' },
+    }, function (opt, coord) {
+      offsetX = Math.floor(coord.x.valInp);
+      offsetY = Math.floor(coord.y.valInp);
+      w = Math.floor(coord.w.valInp);
+      h = Math.floor(coord.h.valInp);
     });
 
-    r.on('end', function(){
+  const newPixels = new ndarray([], [w, h, 4]);
-      var data = Buffer.concat(chunks, totalLength).toString('base64');
+
-      var datauri = 'data:image/' + options.format + ';base64,' + data;
+  for (let x = 0; x < w; x++) {
-      callback(datauri, options.format);
+    for (let y = 0; y < h; y++) {
-    });
+      pixelSetter(x, y, bg, newPixels); // Set the background color
-  });
+    }
+  }
+
+  for (
+    let x = 0;
+    x < Math.min(w - 1, offsetX + iw - 1);
+    x++
+  ) {
+    for (
+      let y = 0;
+      y < Math.min(h - 1, offsetY + ih - 1);
+      y++
+    ) {
+      const inputImgX = x + offsetX,
+        inputImgY = y + offsetY;
+      
+      pixelSetter(x, y, [
+        pixels.get(inputImgX, inputImgY, 0),
+        pixels.get(inputImgX, inputImgY, 1),
+        pixels.get(inputImgX, inputImgY, 2),
+        pixels.get(inputImgX, inputImgY, 3)
+      ], newPixels); // Set the background color
+    }
+  }
+
+  if (cb) cb();
+
+  return newPixels;
 };

src/modules/Crop/Module.js

@@ -1,3 +1,4 @@
+const pixelManipulation = require('../_nomodule/PixelManipulation');
 /*
  * Image Cropping module
  * Usage:
@@ -26,54 +27,39 @@ module.exports = function CropModule(options, UI) {
 
     var step = this;
 
-    // save the input image;
-    // TODO: this should be moved to module API to persist the input image
     options.step.input = input.src;
-    var parseCornerCoordinateInputs = require('../../util/ParseInputCoordinates');
 
-    //parse the inputs
+    // We should do this via event/listener:
-    parseCornerCoordinateInputs(options, {
+    if (ui && ui.hide) ui.hide();
-      src: input.src,
+
-      x: { valInp: options.x, type: 'horizontal' },
+
-      y: { valInp: options.y, type: 'vertical' },
+    function extraManipulation(pixels) {
-      w: { valInp: options.w, type: 'horizontal' },
+      const newPixels = require('./Crop')(pixels, options, function() {
-      h: { valInp: options.h, type: 'vertical' },
+        
-    }, function (options, coord) {
+        // Start custom UI setup (draggable UI)
-      options.x = parseInt(coord.x.valInp);
+        // Only once we have an input image
-      options.y = parseInt(coord.y.valInp);
+        if (setupComplete === false && options.step.inBrowser && !options.noUI) {
-      options.w = coord.w.valInp;
+          setupComplete = true;
-      options.h = coord.h.valInp;
+          ui.setup();
+        }
+      });
+      return newPixels;
+    }
+
+    function output(image, datauri, mimetype, wasmSuccess) {
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
+    }
+
+    return pixelManipulation(input, {
+      output: output,
+      ui: options.step.ui,
+      extraManipulation: extraManipulation,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback,
+      useWasm:options.useWasm
     });
-
-    require('./Crop')(input, options, function (out, format) {
-
-      // This output is accessible to Image Sequencer
-      step.output = {
-        src: out,
-        format: format
-      };
-
-      // This output is accessible to the UI
-      options.step.output = out;
-
-      // Tell the UI that the step has been drawn
-      UI.onComplete(options.step);
-
-      // we should do this via event/listener:
-      if (ui && ui.hide) ui.hide();
-
-      // start custom UI setup (draggable UI)
-      // only once we have an input image
-      if (setupComplete === false && options.step.inBrowser && !options.noUI) {
-        setupComplete = true;
-        ui.setup();
-      }
-
-      // Tell Image Sequencer that step has been drawn
-      callback();
-
-    });
-
   }
 
   return {

src/modules/Crop/Ui.js

@@ -59,12 +59,6 @@ module.exports = function CropModuleUi(step, ui) {
     ];
   }
 
-  function remove() {
-    $(imgEl()).imgAreaSelect({
-      remove: true
-    });
-  }
-
   function hide() {
     // then hide the draggable UI
     $(imgEl()).imgAreaSelect({
@@ -92,7 +86,6 @@ module.exports = function CropModuleUi(step, ui) {
 
   return {
     setup: setup,
-    remove: remove,
     hide: hide
   };
 };

src/modules/Crop/info.json

@@ -16,12 +16,12 @@
     "w": {
       "type": "string",
       "desc": "Width of crop",
-      "default": "(50%)"
+      "default": "100%"
     },
     "h": {
       "type": "string",
       "desc": "Height of crop",
-      "default": "(50%)"
+      "default": "100%"
     },
     "backgroundColor": {
       "type": "text",

src/modules/DecodeQr/Module.js

@@ -28,18 +28,16 @@ module.exports = function DoNothing(options, UI) {
       options.step.qrval = (decoded) ? decoded.data : 'undefined';
     });
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-      // This output is accessible by Image Sequencer
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = {
-        src: datauri,
-        format: mimetype
-      };
     }
+    
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,
       format: input.format,
       image: options.image,
+      inBrowser: options.inBrowser,
       callback: callback,
       useWasm:options.useWasm
     });

src/modules/Dither/Module.js

@@ -15,10 +15,8 @@ module.exports = function Dither(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-      // This output is accessible by Image Sequencer
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
@@ -27,6 +25,7 @@ module.exports = function Dither(options, UI) {
       extraManipulation: extraManipulation,
       format: input.format,
       image: options.image,
+      inBrowser: options.inBrowser,
       callback: callback,
       useWasm:options.useWasm
     });

src/modules/DrawRectangle/DrawRectangle.js

@@ -4,22 +4,24 @@ module.exports = exports = function(pixels, options){
 
   options.startingX = options.startingX || defaults.startingX;
   options.startingY = options.startingY || defaults.startingY;
+
   var ox = Number(options.startingX),
 	  oy = Number(options.startingY),
 	  iw = pixels.shape[0],
 	  ih = pixels.shape[1],
     thickness = Number(options.thickness) || defaults.thickness,
-	  ex =  options.endX = Number(options.endX) - thickness || iw - 1,
+	  ex = Number(options.endX || defaults.endX) - thickness || iw - 1,
-	  ey = options.endY = Number(options.endY) - thickness || ih - 1,
+	  ey = Number(options.endY || defaults.endY) - thickness || ih - 1,
     color = options.color || defaults.color;
-  color = color.substring(color.indexOf('(') + 1, color.length - 1); // extract only the values from rgba(_,_,_,_)
+  
+  color = color.substring(color.indexOf('(') + 1, color.length - 1); // Extract only the values from rgba(_,_,_,_)
   color = color.split(',');
 
   var drawSide = function(startX, startY, endX, endY){
     for (var n = startX; n <= endX + thickness; n++){
       for (var k = startY; k <= endY + thickness; k++){
 
-        pixelSetter(n, k, color, pixels); //to remove 4th channel - pixels.set(n, k, 3, color[3]);
+        pixelSetter(n, k, [color[0], color[1], color[2]], pixels); // To remove 4th channel - pixels.set(n, k, 3, color[3]);
       }
     }
   };

src/modules/DrawRectangle/Module.js

@@ -19,10 +19,8 @@ module.exports = function DrawRectangle(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {
@@ -32,6 +30,7 @@ module.exports = function DrawRectangle(options, UI) {
       extraManipulation: extraManipulation,
       format: input.format,
       image: options.image,
+      inBrowser: options.inBrowser,
       callback: callback,
       useWasm:options.useWasm
     });

src/modules/DrawRectangle/info.json

@@ -17,13 +17,13 @@
       "endX":{
         "type": "integer",
         "desc": "last x position of the rectangle",
-        "default": "width"
+        "default": 10
       },
 
       "endY":{
         "type": "integer",
         "desc": "last y position of the rectangle",
-        "default": "height"
+        "default": 10
       },
 
       "thickness":{

src/modules/Dynamic/Module.js

@@ -1,5 +1,5 @@
 module.exports = function Dynamic(options, UI) {
-
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
   var output;
 
   // This function is called on every draw.
@@ -10,24 +10,24 @@ module.exports = function Dynamic(options, UI) {
 
     var step = this;
 
-    // start with monochrome, but if options.red, options.green, and options.blue are set, accept them too
+    options.red = options.red || defaults.red;
-    options.monochrome = options.monochrome || '(R+G+B)/3';
+    options.blue = options.blue || defaults.blue;
+    options.green = options.green || defaults.green;
 
+    const Parser = require('expr-eval').Parser;
     function generator(expression) {
-      var func = 'f = function (r, g, b, a) { var R = r, G = g, B = b, A = a;';
+      let expr = Parser.parse('R = r; G = g; B = b; A = a; ' + expression);
-      func = func + 'return ';
+      return expr.toJSFunction("r,g,b,a,R,G,B,A");
-      func = func + expression + '}';
-      var f;
-      eval(func);
-      return f;
     }
-
+    
     var channels = ['red', 'green', 'blue', 'alpha'];
 
     channels.forEach(function(channel) {
-      if (options.hasOwnProperty(channel)) options[channel + '_function'] = generator(options[channel]);
+      if (channel === 'alpha'){
-      else if (channel === 'alpha') options['alpha_function'] = function() { return 255; };
+        options['alpha_function'] = function() { return 255; };
-      else options[channel + '_function'] = generator(options.monochrome);
+      } else {
+        options[channel + '_function'] = generator(options[channel]);
+      }
     });
 
     function changePixel(r, g, b, a) {
@@ -71,12 +71,10 @@ module.exports = function Dynamic(options, UI) {
       }
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
+    
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       ui: options.step.ui,

src/modules/Dynamic/info.json

@@ -16,11 +16,6 @@
       "type": "string",
       "desc": "Expression to return for blue channel with R, G, B, and A inputs",
       "default": "b"
-    },
-    "monochrome (fallback)": {
-      "type": "string",
-      "desc": "Expression to return with R, G, B, and A inputs; fallback for other channels if none provided",
-      "default": "r + g + b"
     }
   },
   "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#dynamic-module"

src/modules/EdgeDetect/EdgeUtils.js

@@ -1,6 +1,8 @@
-// Define kernels for the sobel filter
+// Read More: https://en.wikipedia.org/wiki/Canny_edge_detector
 
 const pixelSetter = require('../../util/pixelSetter.js');
+
+// Define kernels for the sobel filter.
 const kernelx = [
     [-1, 0, 1],
     [-2, 0, 2],
@@ -12,16 +14,14 @@ const kernelx = [
     [ 1, 2, 1]
   ];
 
-let pixelsToBeSupressed = [];
-
 module.exports = function(pixels, highThresholdRatio, lowThresholdRatio, useHysteresis) {
-  let angles = [], grads = [], strongEdgePixels = [], weakEdgePixels = [];
+  let angles = [], grads = [], strongEdgePixels = [], weakEdgePixels = [], pixelsToBeSupressed = [];
-  
+
   for (var x = 0; x < pixels.shape[0]; x++) {
     grads.push([]);
     angles.push([]);
     for (var y = 0; y < pixels.shape[1]; y++) {
-      var result = sobelFilter(
+      var result = sobelFilter( // Convolves the sobel filter on every pixel
         pixels,
         x,
         y
@@ -32,28 +32,47 @@ module.exports = function(pixels, highThresholdRatio, lowThresholdRatio, useHyst
       angles.slice(-1)[0].push(result.angle);
     }
   }
-  nonMaxSupress(pixels, grads, angles);
+  nonMaxSupress(pixels, grads, angles, pixelsToBeSupressed); // Non Maximum Suppression: Filter fine edges.
-  doubleThreshold(pixels, highThresholdRatio, lowThresholdRatio, grads, strongEdgePixels, weakEdgePixels);
+  doubleThreshold(pixels, highThresholdRatio, lowThresholdRatio, grads, strongEdgePixels, weakEdgePixels, pixelsToBeSupressed); // Double Threshold: Categorizes edges into strong and weak edges based on two thresholds.
-  if(useHysteresis.toLowerCase() == 'true') hysteresis(strongEdgePixels, weakEdgePixels);
+  if(useHysteresis.toLowerCase() == 'true') hysteresis(strongEdgePixels, weakEdgePixels); // Optional Hysteresis (very slow) to minimize edges generated due to noise.
 
-  strongEdgePixels.forEach(pixel => preserve(pixels, pixel));
+  strongEdgePixels.forEach(pixel => preserve(pixels, pixel)); // Makes the strong edges White.
-  weakEdgePixels.forEach(pixel => supress(pixels, pixel));
+  weakEdgePixels.forEach(pixel => supress(pixels, pixel)); // Makes the weak edges black(bg color) after filtering.
-  pixelsToBeSupressed.forEach(pixel => supress(pixels, pixel));
+  pixelsToBeSupressed.forEach(pixel => supress(pixels, pixel)); // Makes the rest of the image black.
 
   return pixels;
 };
 
+/**
+ * @method supress
+ * @description Supresses (fills with background color) the specified (non-edge)pixel.
+ * @param {Object} pixels ndarry of pixels
+ * @param {Float32Array} pixel Pixel coordinates
+ * @returns {Null}
+ */
 function supress(pixels, pixel) {
   pixelSetter(pixel[0], pixel[1], [0, 0, 0, 255], pixels);
-
 }
 
+/**
+ * @method preserve
+ * @description Preserve the specified pixel(of an edge).
+ * @param {Object} pixels ndarray of pixels
+ * @param {*} pixel Pixel coordinates
+ * @returns {Null}
+ */
 function preserve(pixels, pixel) {
   pixelSetter(pixel[0], pixel[1], [255, 255, 255, 255], pixels);
-
 }
 
-// sobelFilter function that convolves sobel kernel over every pixel
+/**
+ * @method sobelFiler
+ * @description Runs the sobel filter on the specified and neighbouring pixels.
+ * @param {Object} pixels ndarray of pixels
+ * @param {Number} x x-coordinate of the pixel
+ * @param {Number} y y-coordinate of the pixel
+ * @returns {Object} Object containing the gradient and angle.
+ */
 function sobelFilter(pixels, x, y) {
   let val = pixels.get(x, y, 0),
     gradX = 0.0,
@@ -65,8 +84,8 @@ function sobelFilter(pixels, x, y) {
       let xn = x + a - 1,
         yn = y + b - 1;
 
-      if (isOutOfBounds(pixels, xn, yn)) {
+      if (isOutOfBounds(pixels, xn, yn)) { // Fallback for coordinates which lie outside the image.
-        gradX += pixels.get(xn + 1, yn + 1, 0) * kernelx[a][b];
+        gradX += pixels.get(xn + 1, yn + 1, 0) * kernelx[a][b]; // Fallback to nearest pixel
         gradY += pixels.get(xn + 1, yn + 1, 0) * kernely[a][b];
       }
       else {
@@ -84,11 +103,20 @@ function sobelFilter(pixels, x, y) {
   };
 }
 
+/**
+ * @method categorizeAngle
+ * @description Categorizes the given angle into 4 catagories according to the Category Map given below.
+ * @param {Number} angle Angle in degrees
+ * @returns {Number} Category number of the given angle
+ */
 function categorizeAngle(angle){
-  if ((angle >= -22.5 && angle <= 22.5) || (angle < -157.5 && angle >= -180)) return 1;
+  const pi = Math.PI;
-  else if ((angle >= 22.5 && angle <= 67.5) || (angle < -112.5 && angle >= -157.5)) return 2;
+  angle = angle > 0 ? angle : pi - Math.abs(angle); // Diagonally flip the angle if it is negative (since edge remains the same)
-  else if ((angle >= 67.5 && angle <= 112.5) || (angle < -67.5 && angle >= -112.5)) return 3;
+
-  else if ((angle >= 112.5 && angle <= 157.5) || (angle < -22.5 && angle >= -67.5)) return 4;
+  if (angle <= pi / 8 || angle > 7 * pi / 8) return 1;
+  else if (angle > pi / 8 && angle <= 3 * pi / 8) return 2;
+  else if (angle > 3 * pi / 8 && angle <= 5 * pi / 8) return 3;
+  else if (angle > 5 * pi / 8 && angle <= 7 * pi / 8) return 4;
 
   /* Category Map
   * 1 => E-W
@@ -98,33 +126,39 @@ function categorizeAngle(angle){
   */
 }
 
+/**
+ * @method isOutOfBounds
+ * @description Checks whether the given coordinates lie outside the bounds of the image. Used for error handling in convolution.
+ * @param {Object} pixels ndarray of pixels
+ * @param {*} x x-coordinate of the pixel
+ * @param {*} y y-coordinate of the pixel
+ * @returns {Boolean} True if the given coordinates are out of bounds.
+ */
 function isOutOfBounds(pixels, x, y){
   return ((x < 0) || (y < 0) || (x >= pixels.shape[0]) || (y >= pixels.shape[1]));
 }
 
-const removeElem = (arr = [], elem) => {
+const removeElem = (arr = [], elem) => { // Removes the specified element from the given array.
   return arr = arr.filter((arrelem) => {
     return arrelem !== elem;
   });
 };
 
-// Non Maximum Supression without interpolation
+// Non Maximum Supression without interpolation.
-function nonMaxSupress(pixels, grads, angles) {
+function nonMaxSupress(pixels, grads, angles, pixelsToBeSupressed) {
-  angles = angles.map((arr) => arr.map(convertToDegrees));
-
   for (let x = 0; x < pixels.shape[0]; x++) {
     for (let y = 0; y < pixels.shape[1]; y++) {
 
       let angleCategory = categorizeAngle(angles[x][y]);
 
       if (!isOutOfBounds(pixels, x - 1, y - 1) && !isOutOfBounds(pixels, x + 1, y + 1)){
-        switch (angleCategory){
+        switch (angleCategory){ // Non maximum suppression according to angle category
         case 1:
           if (!((grads[x][y] >= grads[x][y + 1]) && (grads[x][y] >= grads[x][y - 1]))) {
             pixelsToBeSupressed.push([x, y]);
           }
           break;
-          
+
         case 2:
           if (!((grads[x][y] >= grads[x + 1][y + 1]) && (grads[x][y] >= grads[x - 1][y - 1]))){
             pixelsToBeSupressed.push([x, y]);
@@ -147,17 +181,15 @@ function nonMaxSupress(pixels, grads, angles) {
     }
   }
 }
-// Converts radians to degrees
-var convertToDegrees = radians => (radians * 180) / Math.PI;
 
-// Finds the max value in a 2d array like grads
+// Finds the max value in a 2d array like grads.
 var findMaxInMatrix = arr => Math.max(...arr.map(el => el.map(val => val ? val : 0)).map(el => Math.max(...el)));
 
-// Applies the double threshold to the image
+// Applies the double threshold to the image.
-function doubleThreshold(pixels, highThresholdRatio, lowThresholdRatio, grads, strongEdgePixels, weakEdgePixels) {
+function doubleThreshold(pixels, highThresholdRatio, lowThresholdRatio, grads, strongEdgePixels, weakEdgePixels, pixelsToBeSupressed) {
 
-  const highThreshold = findMaxInMatrix(grads) * highThresholdRatio,
+  const highThreshold = findMaxInMatrix(grads) * highThresholdRatio, // High Threshold relative to the strongest edge
-    lowThreshold = highThreshold * lowThresholdRatio;
+    lowThreshold = highThreshold * lowThresholdRatio; // Low threshold relative to high threshold
 
   for (let x = 0; x < pixels.shape[0]; x++) {
     for (let y = 0; y < pixels.shape[1]; y++) {
@@ -178,6 +210,12 @@ function doubleThreshold(pixels, highThresholdRatio, lowThresholdRatio, grads, s
   }
 }
 
+/**
+ * @method hysteresis
+ * @description Filters weak edge pixels that are not connected to a strong edge pixel.
+ * @param {Float32array} strongEdgePixels 2D array of strong edge pixel coordinates
+ * @param {*} weakEdgePixels 2D array of weak edge pixel coordinated
+ */
 function hysteresis(strongEdgePixels, weakEdgePixels){
   strongEdgePixels.forEach(pixel => {
     let x = pixel[0],

src/modules/EdgeDetect/Module.js

@@ -1,5 +1,8 @@
+const Blur = require('../Blur/Blur');
 /*
 * Detect Edges in an Image
+* Uses Canny method for the same
+* Read more: https://en.wikipedia.org/wiki/Canny_edge_detector
 */
 module.exports = function edgeDetect(options, UI) {
 
@@ -13,48 +16,36 @@ module.exports = function edgeDetect(options, UI) {
 
   // The function which is called on every draw.
   function draw(input, callback, progressObj) {
-
     progressObj.stop(true);
     progressObj.overrideFlag = true;
 
     var step = this;
 
-    // Blur the image
+    // Makes the image greyscale
-    const internalSequencer = ImageSequencer({ inBrowser: false, ui: false });
+    function changePixel(r, g, b, a) {
-    return internalSequencer.loadImage(input.src, function() {
+      return [(r + g + b) / 3, (r + g + b) / 3, (r + g + b) / 3, a];
-      internalSequencer.importJSON([{ 'name': 'blur', 'options': { blur: options.blur } }]);
+    }
-      return internalSequencer.run(function onCallback(internalOutput) {
-        require('get-pixels')(internalOutput, function(err, blurPixels) {
-          if (err) {
-            return;
-          }
 
-          // Extra Manipulation function used as an enveloper for applying gaussian blur and Convolution
+    // Extra Manipulation function used as an enveloper for applying gaussian blur and Convolution
-          function changePixel(r, g, b, a) {
+    function extraManipulation(pixels) {
-            return [(r + g + b) / 3, (r + g + b) / 3, (r + g + b) / 3, a];
+      const blurPixels = Blur(pixels, options.blur);
-          }
+      return require('./EdgeUtils')(blurPixels, options.highThresholdRatio, options.lowThresholdRatio, options.hysteresis);
+    }
 
-          function extraManipulation() {
+    function output(image, datauri, mimetype, wasmSuccess) {
-            return require('./EdgeUtils')(blurPixels, options.highThresholdRatio, options.lowThresholdRatio, options.hysteresis);
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-          }
+    }
 
-          function output(image, datauri, mimetype) {
+    return require('../_nomodule/PixelManipulation.js')(input, {
-            step.output = { src: datauri, format: mimetype };
+      output: output,
-          }
+      ui: options.step.ui,
-
+      changePixel: changePixel,
-          return require('../_nomodule/PixelManipulation.js')(input, {
+      extraManipulation: extraManipulation,
-            output: output,
+      format: input.format,
-            ui: options.step.ui,
+      image: options.image,
-            changePixel: changePixel,
+      inBrowser: options.inBrowser,
-            extraManipulation: extraManipulation,
+      callback: callback,
-            format: input.format,
+      useWasm: options.useWasm
-            image: options.image,
-            inBrowser: options.inBrowser,
-            callback: callback,
-            useWasm: options.useWasm
-          });
-        });
-      });
     });
   }
 
@@ -64,4 +55,4 @@ module.exports = function edgeDetect(options, UI) {
     output: output,
     UI: UI
   };
-};
+};

src/modules/EdgeDetect/info.json

@@ -1,6 +1,6 @@
 {
     "name": "edge-detect",
-    "description": "This module detects edges using the Canny method, which first Gaussian blurs the image to reduce noise (amount of blur configurable in settings as `options.blur`), then applies a number of steps to highlight edges, resulting in a greyscale image where the brighter the pixel, the stronger the detected edge.<a href='https://en.wikipedia.org/wiki/Canny_edge_detector'> Read more. </a>",
+    "description": "Edge Detect module detects edges using the Canny method, which first blurs the image to reduce noise (amount of blur configurable in settings as `options.blur`), then applies a number of steps to highlight edges, resulting in a greyscale image where the brighter the pixel, the stronger the detected edge. [Read more](https://en.wikipedia.org/wiki/Canny_edge_detector)",
     "inputs": {
         "blur": {
             "type": "float",

src/modules/Exposure/Module.js

@@ -24,11 +24,8 @@ module.exports = function Exposure(options, UI) {
       return [r, g, b, a];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/Exposure/info.json

@@ -11,5 +11,5 @@
           "step": 0.05
       }
   },
-  "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md"
+  "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#exposure-module"
 }

src/modules/FlipImage/Module.js

@@ -1,11 +1,12 @@
+const _ = require('lodash');
 /*
  * Flip the image on vertical/horizontal axis.
  */
 module.exports = function FlipImage(options, UI) {
-  options.Axis = options.Axis || require('./info.json').inputs.Axis.default;
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+  options.Axis = options.Axis || defaults.Axis;
 
-  var output,
+  let output;
-    getPixels = require('get-pixels');
 
   function draw(input, callback, progressObj) {
 
@@ -14,34 +15,30 @@ module.exports = function FlipImage(options, UI) {
 
     var step = this;
 
-    return getPixels(input.src, function(err, oldPixels) {
+    function changePixel(r, g, b, a) {
-      function changePixel(r, g, b, a) {
+      return [r, g, b, a];
-        return [r, g, b, a];
+    }
-      }
+    function extraManipulation(pixels) {
-      function extraManipulation(pixels) {
+      const oldPixels = _.cloneDeep(pixels);
-        if (err) {
-          console.log(err);
-          return;
-        }
-        return require('./flipImage')(oldPixels, pixels, options.Axis);
-      }
-      function output(image, datauri, mimetype) {
-        step.output = { src: datauri, format: mimetype };
-      }
 
-      return require('../_nomodule/PixelManipulation.js')(input, {
+      return require('./flipImage')(oldPixels, pixels, options.Axis);
-        output: output,
+    }
-        ui: options.step.ui,
+    
-        changePixel: changePixel,
+    function output(image, datauri, mimetype, wasmSuccess) {
-        extraManipulation: extraManipulation,
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-        format: input.format,
+    }
-        image: options.image,
+
-        inBrowser: options.inBrowser,
+    return require('../_nomodule/PixelManipulation.js')(input, {
-        callback: callback,
+      output: output,
-        useWasm:options.useWasm
+      ui: options.step.ui,
-      });
+      changePixel: changePixel,
+      extraManipulation: extraManipulation,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback,
+      useWasm:options.useWasm
     });
-
   }
 
   return {

src/modules/GammaCorrection/Module.js

@@ -10,8 +10,7 @@ module.exports = function Gamma(options, UI) {
     var step = this;
 
     var defaults = require('./../../util/getDefaults.js')(require('./info.json')),
-      adjustment = options.adjustment || defaults.adjustment;
+      val = options.adjustment || defaults.adjustment;
-    var val = adjustment / defaults.adjustment;
 
     function changePixel(r, g, b, a) {
 
@@ -22,10 +21,8 @@ module.exports = function Gamma(options, UI) {
       return [r, g, b, a];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/GammaCorrection/info.json

@@ -5,9 +5,10 @@
         "adjustment": {
             "type": "float",
             "desc": "gamma correction (inverse of actual gamma factor) for the new image",
-            "default": 0.2,
+            "default": 0.5,
-            "min": 2,
+            "min": 0,
-            "max": 1
+            "max": 5,
+            "step": 0.1
         }
     },
     "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#gamma-correction-module"

src/modules/Gradient/Module.js

@@ -1,55 +1,57 @@
-module.exports = function Invert(options, UI) {
+const pixelSetter = require('../../util/pixelSetter.js'),
-  const pixelSetter = require('../../util/pixelSetter.js');
+  pixelManipulation = require('../_nomodule/PixelManipulation');
+
+module.exports = function Gradient(options, UI) {
+
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+  options.gradientType = options.gradientType || defaults.gradientType;
 
   var output;
 
   // The function which is called on every draw.
   function draw(input, callback) {
-
-    var getPixels = require('get-pixels');
-    var savePixels = require('save-pixels');
-
     var step = this;
 
-    getPixels(input.src, function(err, pixels) {
+    function output(image, datauri, mimetype, wasmSuccess) {
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
+    }
 
-      if (err) {
+    function extraManipulation(pixels) {
-        console.log('Bad Image path');
+      const [w, h] = pixels.shape;
-        return;
+      if (options.gradientType === 'linear') {
-      }
+        for (var i = 0; i < w; i++) {
-
+          for (var j = 0; j < h; j++) {
-      var width = pixels.shape[0];
+            let val = (i / w) * 255;
-
+            
-      for (var i = 0; i < pixels.shape[0]; i++) {
+            pixelSetter(i, j, [val, val, val, 255], pixels);
-        for (var j = 0; j < pixels.shape[1]; j++) {
+          }
-          let val = (i / width) * 255;
+        }
-          pixelSetter(i, j, [val, val, val, 255], pixels);
+      }
-                
+      else {
+        for (var i = 0; i < w; i++) {
+          for (var j = 0; j < h; j++) {
+            var distX = Math.abs(w / 2 - i);
+            var distY = Math.abs(h / 2 - j);
+            var distance = Math.sqrt(Math.pow(distX, 2) + Math.pow(distY, 2));
+            val = 255 * (distance / pixels.shape[0]);
+            pixelSetter(i, j, [val, val, val, 255], pixels);
+          }
         }
       }
-      var chunks = [];
-      var totalLength = 0;
-      var r = savePixels(pixels, input.format, { quality: 100 });
 
-      r.on('data', function(chunk) {
+      return pixels;
-        totalLength += chunk.length;
+    }
-        chunks.push(chunk);
-      });
 
-      r.on('end', function() {
+    return pixelManipulation(input, {
-        var data = Buffer.concat(chunks, totalLength).toString('base64');
+      output,
-        var datauri = 'data:image/' + input.format + ';base64,' + data;
+      extraManipulation,
-        output(input.image, datauri, input.format);
+      callback,
-        callback();
+      format: input.format,
-      });
+      image: options.image,
+      inBrowser: options.inBrowser,
+      useWasm:options.useWasm
     });
 
-    function output(image, datauri, mimetype) {
-
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
-    }
   }
 
   return {

src/modules/Gradient/info.json

@@ -1,6 +1,13 @@
 {
     "name": "gradient",
     "description": "Gives a gradient of the image",
-    "inputs": {},
+    "inputs": {
+      "gradientType": {
+        "type": "select",
+        "desc": "Choose between linear or circular gradient",
+        "default": "linear",
+        "values": ["linear", "circular"]
+      }
+    },
     "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#gradient-module"
 }

src/modules/GridOverlay/GridOverlay.js

@@ -2,11 +2,11 @@ module.exports = exports = function(pixels, options){
   var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
   const pixelSetter = require('../../util/pixelSetter.js');
 
-  if(Number(options.x)==0){
+  if(Number(options.x) == 0){
     options.x = 1;
-  } 
+  }
-  if( Number(options.y)==0) {
+  if( Number(options.y) == 0) {
-    options.y =1;
+    options.y = 1;
   }
 
   options.x = Math.abs(Number(options.x)) || defaults.x;
@@ -17,14 +17,14 @@ module.exports = exports = function(pixels, options){
 
   for(var x = 0; x < pixels.shape[0]; x += options.x){
     for(var y = 0 ; y < pixels.shape[1]; y++){
-      pixelSetter(x, y, color, pixels); // to remove 4th channel - pixels.set(x, y, 3, color[3]);
+      pixelSetter(x, y, [color[0], color[1], color[2]], pixels); // to remove 4th channel - pixels.set(x, y, 3, color[3]);
                 
     }
   }
     
   for(var y = 0; y < pixels.shape[1]; y += options.y){
     for(var x = 0 ; x < pixels.shape[0]; x++){
-      pixelSetter(x, y, color, pixels); // to remove 4th channel - pixels.set(x, y, 3, color[3]);
+      pixelSetter(x, y, [color[0], color[1], color[2]], pixels); // to remove 4th channel - pixels.set(x, y, 3, color[3]);
 
     }
   }

src/modules/GridOverlay/Module.js

@@ -15,11 +15,8 @@ module.exports = function GridOverlay(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accesible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/Histogram/Module.js

@@ -11,7 +11,7 @@ module.exports = function Channel(options, UI) {
     const pixelSetter = require('../../util/pixelSetter.js');
 
     options.gradient = options.gradient || defaults.gradient;
-    options.gradient = JSON.parse(options.gradient);
+    options.gradient = String(JSON.parse(options.gradient));
 
     progressObj.stop(true);
     progressObj.overrideFlag = true;
@@ -63,11 +63,8 @@ module.exports = function Channel(options, UI) {
       return pixels;
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accesible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
     return require('../_nomodule/PixelManipulation.js')(input, {

src/modules/ImportImage/Ui.js

@@ -8,7 +8,7 @@ module.exports = function ImportImageModuleUi(step, ui) {
 
     // add a file input listener
     var dropZone = '\
-    <div class="dropzone" style="padding: 30px;margin: 10px 20% 30px;border: 4px dashed #ccc;border-radius: 8px;text-align: center;color: #444;" id="' + dropzoneId + '">\
+    <div class="dropzone import-image-zone" id="' + dropzoneId + '">\
           <p>\
         <i>Select or drag in an image to overlay.</i>\
       </p>\

src/modules/Invert/Module.js

@@ -1,3 +1,4 @@
+const pixelManipulation = require('../_nomodule/PixelManipulation');
 /*
  * Invert the image
  */
@@ -17,14 +18,11 @@ function Invert(options, UI) {
       return [255 - r, 255 - g, 255 - b, a];
     }
 
-    function output(image, datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = { src: datauri, format: mimetype };
-
     }
 
-    return input.pixelManipulation({
+    return pixelManipulation(input, {
       output: output,
       changePixel: changePixel,
       format: input.format,
@@ -43,10 +41,4 @@ function Invert(options, UI) {
     UI: UI
   };
 }
-var info = {
+module.exports = Invert;
-  'name': 'invert',
-  'description': 'Inverts the image.',
-  'inputs': {
-  }
-};
-module.exports = [Invert, info];

src/modules/Invert/index.js

@@ -0,0 +1,4 @@
+module.exports = [
+  require('./Module'),
+  require('./info.json')
+];

src/modules/Mask/Module.js

@@ -0,0 +1,82 @@
+module.exports = function Mask(options, UI, util) {
+  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
+  options.offset = options.offset || defaults.offset;
+  options.resize = options.resize || defaults.resize;
+
+  var output;
+
+  // This function is called on every draw.
+  function draw(input, callback, progressObj) {
+    progressObj.stop(true);
+    progressObj.overrideFlag = true;
+
+    var step = this;
+
+    var getPixels = require('get-pixels');
+
+    // convert offset as string to int
+    if (typeof options.offset === 'string')
+      options.offset = parseInt(options.offset);
+
+    // save first image's pixels
+    var priorStep = this.getStep(options.offset);
+
+    if (priorStep.output === undefined) {
+      this.output = input;
+      UI.notify('Offset Unavailable', 'offset-notification');
+      callback();
+    }
+
+    const alpha_masking = function(c, a) {
+      return (a * c + (255 - a) * c) / 255;
+    };
+    const internalSequencer = ImageSequencer({ inBrowser: false, ui: false });
+    internalSequencer.loadImage(priorStep.output.src, function() {
+      internalSequencer.importJSON([{ 'name': 'resize', 'options': { resize: options.resize } }]);
+      internalSequencer.run(function onCallback(internalOutput) {
+
+        getPixels(internalOutput, function(err, pixels) {
+          options.firstImagePixels = pixels;
+
+          function changePixel(r2, g2, b2, a2, x, y) {
+            let p = options.firstImagePixels;
+            let r1 = p.get(x, y, 0),
+              g1 = p.get(x, y, 1),
+              b1 = p.get(x, y, 2),
+              a1 = p.get(x, y, 3);
+
+            return [alpha_masking(r1, a2), alpha_masking(g1, a2), alpha_masking(b1, a2)];
+          }
+
+          function output(image, datauri, mimetype, wasmSuccess) {
+            step.output = {
+              src: datauri,
+              format: mimetype,
+              wasmSuccess,
+              useWasm: options.useWasm
+            };
+          }
+
+          // run PixelManipulatin on second image's pixels
+          return require('../_nomodule/PixelManipulation.js')(input, {
+            output: output,
+            ui: options.step.ui,
+            changePixel: changePixel,
+            format: input.format,
+            image: options.image,
+            inBrowser: options.inBrowser,
+            callback: callback,
+            useWasm: options.useWasm
+          });
+        });
+      });
+    });
+  }
+
+  return {
+    options: options,
+    draw: draw,
+    output: output,
+    UI: UI
+  };
+};

src/modules/Mask/index.js

@@ -0,0 +1,4 @@
+module.exports = [
+  require('./Module'),
+  require('./info.json')
+];

src/modules/Mask/info.json

@@ -0,0 +1,18 @@
+{
+    "name": "mask",
+    "description": "Masks two images according to their Alpha values",
+    "inputs": {
+      "offset": {
+        "type": "integer",
+        "desc": "Choose which image to mask the current image with. Two steps back is -2, three steps back is -3 etc.",
+        "default": -2
+      },
+      "resize": {
+        "type": "string",
+        "desc": "Percentage value by which first image is to be resized",
+        "default": "125%"
+      }
+    },
+    "docs-link":"https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md"
+  }
+  

src/modules/Matcher/Module.js

@@ -1,63 +0,0 @@
-/*
- * Match the images
- */
-function Match(options, UI) {
-
-  var output, points;
-
-  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
-
-  global.XY = [
-    options.imageX || defaults.imageX,
-    options.imageY || defaults.imageY
-  ];
-
-  const core = require('matcher-core');
-
-  core(function(err, out, code){
-    points = JSON.parse(out.trim());
-  });
-
-  function draw(input, callback, progressObj) {
-
-    progressObj.stop(true);
-    progressObj.overrideFlag = true;
-
-    var step = this;
-
-    function changePixel(r, g, b, a, x, y) {
-      for(var i = 0; i < 500; i++){
-        if(Math.abs(points[i].x - x) <= 10 && Math.abs(points[i].y - y) <= 10){
-          return [0, 255, 0];
-        }
-      }
-      return [r, g, b, a];
-    }
-
-    function output(image, datauri, mimetype) {
-
-      step.output = { src: datauri, format: mimetype };
-
-    }
-
-    return input.pixelManipulation({
-      output: output,
-      changePixel: changePixel,
-      format: input.format,
-      image: options.image,
-      inBrowser: options.inBrowser,
-      callback: callback,
-      useWasm:options.useWasm
-    });
-
-  }
-
-  return {
-    options: options,
-    draw: draw,
-    output: output,
-    UI: UI
-  };
-}
-
-module.exports = Match;

src/modules/Matcher/info.json

@@ -1,15 +0,0 @@
-{
-    "name": "matcher-core",
-    "description": "Pattern-mining module for detecting key-points in images",
-    "url": "https://github.com/publiclab/matcher-core.git",
-    "inputs": {
-        "imageX": {
-            "type": "text",
-            "default": ""
-        },
-        "imageY": {
-            "type": "text",
-            "default": ""
-        }
-    }
-}

src/modules/MinifyImage/Module.js

@@ -49,7 +49,7 @@ module.exports = function MinifyImage(options, UI) {
           reader.readAsDataURL(result);
           reader.onloadend = function () {
             base64data = reader.result;
-            output(base64data, input.format);
+            output(null, base64data, input.format, false);
             if (callback) callback();
             return;
           };
@@ -76,19 +76,14 @@ module.exports = function MinifyImage(options, UI) {
         });
         var destPath = __dirname + '/results/test.' + input.format;
         var data = base64Img.base64Sync(destPath);
-        output(data, input.format);
+        output(null, data, input.format, false);
         if (callback) callback();
-      })();
+      })().catch(e => console.log(e));
     }
 
 
-    function output(datauri, mimetype) {
+    function output(image, datauri, mimetype, wasmSuccess) {
-
+      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
-      // This output is accessible by Image Sequencer
-      step.output = {
-        src: datauri,
-        format: mimetype
-      };
     }
   }
   return {