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add canvas resize module (#994)

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* add canvas resize module

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>

* add tests

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>
This commit is contained in:
Varun Gupta
2019-04-07 22:11:14 +05:30
committed by Jeffrey Warren
parent 7cf96df1ee
commit e4e4548c09
8 changed files with 2137 additions and 1803 deletions
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38
src/modules/_nomodule/PixelManipulation.js
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@@ -69,32 +69,32 @@ module.exports = function PixelManipulation(image, options) {
}
// perform any extra operations on the entire array:
var res;
if (options.extraManipulation) res = options.extraManipulation(pixels,generateOutput);
if (options.extraManipulation) res = options.extraManipulation(pixels, generateOutput);
// there may be a more efficient means to encode an image object,
// but node modules and their documentation are essentially arcane on this point
function generateOutput(){
function generateOutput() {
var chunks = [];
var totalLength = 0;
var r = savePixels(pixels, options.format, { quality: 100 });
var totalLength = 0;
r.on("data", function(chunk) {
totalLength += chunk.length;
chunks.push(chunk);
});
var r = savePixels(pixels, options.format, { quality: 100 });
r.on("end", function() {
var data = Buffer.concat(chunks, totalLength).toString("base64");
var datauri = "data:image/" + options.format + ";base64," + data;
if (options.output)
options.output(options.image, datauri, options.format);
if (options.callback) options.callback();
});
r.on("data", function(chunk) {
totalLength += chunk.length;
chunks.push(chunk);
});
r.on("end", function() {
var data = Buffer.concat(chunks, totalLength).toString("base64");
var datauri = "data:image/" + options.format + ";base64," + data;
if (options.output)
options.output(options.image, datauri, options.format);
if (options.callback) options.callback();
});
}
if(res){
pixels=res;
if (res) {
pixels = res;
generateOutput();
}
else if(!options.extraManipulation) generateOutput();
else if (!options.extraManipulation) generateOutput();
});
};