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processing4/core/PImage.java

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/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
PImage - storage class for pixel data
Part of the Processing project - http://Proce55ing.net
Copyright (c) 2001-03
Ben Fry, Massachusetts Institute of Technology and
Casey Reas, Interaction Design Institute Ivrea
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
*/
package processing.core;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
/**
* [fry 0407XX]
* - get() on RGB images sets the high bits to opaque
* - modification of naming for functions
* - inclusion of Object.clone()
* - make get(), copy(), blend() honor imageMode
* - lots of moving things around for new megabucket api
*
* [toxi 030722]
* advanced copying/blitting code
*
* [fry 030918]
* integrated and modified to fit p5 spec
*
* [toxi 030930]
* - target pixel buffer doesn't loose alpha channel anymore
* with every blitting operation alpha values are increased now
* - resizing by large factors (>250%) doesn't yield any rounding errors
* anymore, changed to 16bit precision (=65536% max or 0.000015% min)
* - replicate() is now only using REPLACE mode to avoid semantic problems
* - added blend() methods to use replicate()'s functionality,
* but with blend modes
*
* [toxi 031006]
* blit_resize() is now clipping input coordinates to avoid array
* exceptions target dimension can be larger than destination image
* object, outside pixels will be skipped
*
* [toxi 031017]
* versions of replicate() and blend() methods which use cross-image
* blitting are now called in the destination image and expect a source
* image object as parameter. this is to provide an easy syntax for cases
* where the main pixel buffer is the destination. as those methods are
* overloaded in BApplet, users can call those functions directly without
* explicitly giving a reference to PGraphics.
*/
public class PImage implements PConstants, Cloneable {
// note that RGB images still require 0xff in the high byte
// because of how they'll be manipulated by other functions
public int format;
public int pixels[];
public int width, height;
// would scan line be useful? maybe for pow of 2 gl textures
// note! inherited by PGraphics
int image_mode = CORNER;
boolean smooth = false;
// for gl subclass / hardware accel
public int cacheIndex;
// private fields
private int fracU, ifU, fracV, ifV, u1, u2, v1, v2, sX, sY, iw, iw1, ih1;
private int ul, ll, ur, lr, cUL, cLL, cUR, cLR;
private int srcXOffset, srcYOffset;
private int r, g, b, a;
private int[] srcBuffer;
// fixed point precision is limited to 15 bits!!
static final int PRECISIONB = 15;
static final int PRECISIONF = 1 << PRECISIONB;
static final int PREC_MAXVAL = PRECISIONF-1;
static final int PREC_ALPHA_SHIFT = 24-PRECISIONB;
static final int PREC_RED_SHIFT = 16-PRECISIONB;
/**
* Constructor required by java compiler for subclasses.
*/
public PImage() { }
/**
* Create a new (transparent) image of a specific size.
* All pixels are set to zero, meaning black, but since the
* alpha is zero, it will be transparent.
*/
public PImage(int width, int height) {
setup(width, height, RGBA);
//this(new int[width * height], width, height, RGBA);
// toxi: is it maybe better to init the image with max alpha enabled?
//for(int i=0; i<pixels.length; i++) pixels[i]=0xffffffff;
// fry: i'm opting for the full transparent image, which is how
// photoshop works, and our audience oughta be familiar with.
// also, i want to avoid having to set all those pixels since
// in java it's super slow, and most using this fxn will be
// setting all the pixels anyway.
// toxi: agreed and same reasons why i left it out ;)
}
public PImage(int pixels[], int width, int height, int format) {
this.pixels = pixels;
this.width = width;
this.height = height;
this.format = format;
this.cacheIndex = -1;
}
/**
* Function to be used by subclasses to setup their own bidness.
*/
public void setup(int width, int height, int format) { // ignore
this.width = width;
this.height = height;
this.pixels = new int[width*height];
this.format = format;
this.cacheIndex = -1;
}
/**
* Construct a new PImage from a java.awt.Image
*
* this constructor assumes that you've done the work of
* making sure a MediaTracker has been used to fully
* download the data and that the img is valid.
*/
public PImage(java.awt.Image img) {
width = img.getWidth(null);
height = img.getHeight(null);
pixels = new int[width*height];
PixelGrabber pg =
new PixelGrabber(img, 0, 0, width, height, pixels, 0, width);
try {
pg.grabPixels();
} catch (InterruptedException e) { }
format = RGB;
cacheIndex = -1;
}
/**
* Set alpha channel for an image.
*/
public void alpha(int alpha[]) {
// don't execute if mask image is different size
if (alpha.length != pixels.length) {
System.err.println("alpha(): the mask image must be the same size");
return;
}
for (int i = 0; i < pixels.length; i++) {
pixels[i] = pixels[i] & 0xffffff | ((alpha[i] & 0xff) << 24);
}
/*
if (highbits) { // grab alpha from the high 8 bits (RGBA style)
for (int i = 0; i < pixels.length; i++) {
pixels[i] = pixels[i] & 0xffffff | (alpha[i] & 0xff000000);
}
} else { // alpha is in the low bits (ALPHA style)
for (int i = 0; i < pixels.length; i++) {
pixels[i] = pixels[i] & 0xffffff | ((alpha[i] & 0xff) << 24);
}
}
*/
format = RGBA;
}
/**
* Set alpha channel for an image using another image as the source.
*/
public void alpha(PImage alpha) {
alpha(alpha.pixels);
}
/**
*/
// FIND_EDGES (no params) .. high pass filter
// BLUR (no params)
// GAUSSIAN_BLUR (one param)
// BLACK_WHITE? (param for midpoint)
// GRAYSCALE
// POSTERIZE (int num of levels)
public void filter(int kind) {
switch (kind) {
case BLACK_WHITE:
filter(BLACK_WHITE, 0.5f);
break;
case GRAYSCALE:
// Converts RGB image data into grayscale using
// weighted RGB components, and keeps alpha channel intact.
// [toxi 040115]
for (int i = 0; i < pixels.length; i++) {
int col = pixels[i];
// luminance = 0.3*red + 0.59*green + 0.11*blue
// 0.30 * 256 = 77
// 0.59 * 256 = 151
// 0.11 * 256 = 28
int lum = (77*(col>>16&0xff) + 151*(col>>8&0xff) + 28*(col&0xff))>>8;
pixels[i] = (col & ALPHA_MASK) | lum<<16 | lum<<8 | lum;
}
break;
}
}
public void filter(int kind, float param) {
switch (kind) {
case BLACK_WHITE: // greater than or equal to the threshold
int thresh = (int) (param * 255);
for (int i = 0; i < pixels.length; i++) {
int max = Math.max((pixels[i] & RED_MASK) >> 16,
Math.max((pixels[i] & GREEN_MASK) >> 8,
(pixels[i] & BLUE_MASK)));
pixels[i] = (pixels[i] & ALPHA_MASK) |
((max < thresh) ? 0x000000 : 0xffffff);
}
break;
case GRAYSCALE:
filter(GRAYSCALE);
break;
}
}
//////////////////////////////////////////////////////////////
// GET/SET PIXELS
/**
* Returns a "color" type (a packed 32 bit int with the color.
* If the image is in RGB format (i.e. on a PVideo object),
* the value will get its high bits set, because of the likely
* case that they haven't been already.
*/
public int get(int x, int y) {
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) return 0;
return (format == RGB) ?
(pixels[y*width + x] & 0xff000000) : pixels[y*width + x];
}
/**
* Grab a subsection of a PImage, and copy it into a fresh PImage.
* This honors imageMode() for the coordinates.
*/
public PImage get(int x, int y, int w, int h) {
if (image_mode == CORNERS) { // if CORNER, do nothing
//x2 += x1; y2 += y1;
// w/h are x2/y2 in this case, bring em down to size
w = (w - x);
h = (h - x);
} else if (image_mode == CENTER) {
// w/h are the proper w/h, but x/y need to be moved
x -= w/2;
y -= h/2;
}
if (x < 0) x = 0;
if (y < 0) y = 0;
if (x + w > width) w = width - x;
if (y + h > height) h = height - y;
PImage newbie = new PImage(new int[w*h], w, h, format);
int index = y*width + x;
int index2 = 0;
for (int row = y; row < y+h; row++) {
System.arraycopy(pixels, index,
newbie.pixels, index2, w);
index+=width;
index2+=w;
}
return newbie;
}
public void set(int x, int y, int c) {
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) return;
pixels[y*width + x] = c;
}
//////////////////////////////////////////////////////////////
// REPLICATING & BLENDING (AREAS) OF PIXELS
/**
* Copies a pixel from place to another (in the same image)
* this function is excluded from using any blend modes because
* it always replaces/overwrites the target pixel value.
*/
/*
public void copy(int sx, int sy, int dx, int dy) {
// In PGraphics, should this copy the zbuffer and stencil too?
if ((sx >= 0) && (sx < width) && (dx >= 0) && (dx < width) &&
(sy >= 0) && (sy < height) && (dy >= 0) && (dy < height)) {
pixels[dy * width + dx] = pixels[sy * width + sx];
}
}
*/
/**
* Copies a pixel from place to another (in different images)
* this function is excluded from using any blend modes
* it always replaces/overwrites the target pixel value
*/
/*
public void copy(PImage src, int sx, int sy, int dx, int dy) {
if ((dx >= 0) && (dx < width) && (sx >= 0) && (sx < src.width) &&
(dy >= 0) && (dy < height) && (sy >= 0) && (sy < src.height)) {
pixels[dy * width + dx] = src.pixels[sy * src.width + sx];
}
}
*/
public void copy(PImage src, int dx, int dy) {
// source
int sx = 0;
int sy = 0;
int sw = src.width;
int sh = src.height;
// target
int tx = dx; // < 0 ? 0 : x;
int ty = dy; // < 0 ? 0 : y;
int tw = width;
int th = height;
if (tx < 0) { // say if target x were -3
sx -= tx; // source x -(-3) (or add 3)
sw += tx; // source width -3
tw += tx; // target width -3
tx = 0; // target x is zero (upper corner)
}
if (ty < 0) {
sy -= ty;
sh += ty;
th += ty;
ty = 0;
}
if (tx + tw > width) {
int extra = (tx + tw) - width;
sw -= extra;
tw -= extra;
}
if (ty + th > height) {
int extra = (ty + th) - height;
sh -= extra;
sw -= extra;
}
for (int row = sy; row < sy + sh; row++) {
System.arraycopy(src.pixels, row*src.width + sx,
pixels, (dy+row)*width + tx, sw);
}
}
/**
* Copy things from one area of this image
* to another area in the same image.
*/
public void copy(int sx1, int sy1, int sx2, int sy2,
int dx1, int dy1, int dx2, int dy2) {
copy(this, sx1, sy1, sx2, sy2, dx1, dy1, dx2, dy2);
}
/**
* Copies area of one image into another PImage object.
*/
public void copy(PImage src, int sx1, int sy1, int sx2, int sy2,
int dx1, int dy1, int dx2, int dy2) {
if (image_mode == CORNER) { // if CORNERS, do nothing
sx2 += sx1; sy2 += sy1;
dx2 += dx1; dy2 += dy1;
} else if (image_mode == CENTER) {
sx2 /= 2f; sy2 /= 2f;
dx2 /= 2f; dy2 /= 2f;
}
if ((src == this) &&
intersect(sx1, sy1, sx2, sy2, dx1, dy1, dx2, dy2)) {
// if src is me, and things intersect, make a copy of the data
blit_resize(get(sx1, sy1, sx2 - sx1, sy2 - sy1),
0, 0, sx2 - sx1 - 1, sy2 - sy1 - 1,
pixels, width, height, dx1, dy1, dx2, dy2, REPLACE);
} else {
blit_resize(src, sx1, sy1, sx2, sy2,
pixels, width, height, dx1, dy1, dx2, dy2, REPLACE);
}
}
/**
* Blend a two colors based on a particular mode.
*/
static public int blend(int c1, int c2, int mode) {
switch (mode) {
case BLEND: return blend_multiply(c1, c2);
case ADD: return blend_add_pin(c1, c2);
case SUBTRACT: return blend_sub_pin(c1, c2);
case LIGHTEST: return blend_lightest(c1, c2);
case DARKEST: return blend_darkest(c1, c2);
case REPLACE: return c2;
}
return 0;
}
/**
* Copies and blends 1 pixel with MODE to pixel in another image
*/
public void blend(PImage src, int sx, int sy, int dx, int dy, int mode) {
if ((dx >= 0) && (dx < width) && (sx >= 0) && (sx < src.width) &&
(dy >= 0) && (dy < height) && (sy >= 0) && (sy < src.height)) {
pixels[dy * width + dx] =
blend(pixels[dy * width + dx],
src.pixels[sy * src.width + sx], mode);
}
}
public void blend(int sx, int sy, int dx, int dy, int mode) {
if ((dx >= 0) && (dx < width) && (sx >= 0) && (sx < width) &&
(dy >= 0) && (dy < height) && (sy >= 0) && (sy < height)) {
pixels[dy * width + dx] =
blend(pixels[dy * width + dx], pixels[sy * width + sx], mode);
}
}
/**
* Blends one area of this image to another area
*/
public void blend(int sx1, int sy1, int sx2, int sy2,
int dx1, int dy1, int dx2, int dy2, int mode) {
blend(this, sx1, sy1, sx2, sy2, dx1, dy1, dx2, dy2, mode);
}
/**
* Copies area of one image into another PImage object
*/
public void blend(PImage src, int sx1, int sy1, int sx2, int sy2,
int dx1, int dy1, int dx2, int dy2, int mode) {
if (image_mode == CORNER) { // if CORNERS, do nothing
sx2 += sx1; sy2 += sy1;
dx2 += dx1; dy2 += dy1;
} else if (image_mode == CENTER) {
sx2 /= 2f; sy2 /= 2f;
dx2 /= 2f; dy2 /= 2f;
}
if ((src == this) &&
intersect(sx1, sy1, sx2, sy2, dx1, dy1, dx2, dy2)) {
blit_resize(get(sx1, sy1, sx2 - sx1, sy2 - sy1),
0, 0, sx2 - sx1 - 1, sy2 - sy1 - 1,
pixels, width, height, dx1, dy1, dx2, dy2, mode);
} else {
blit_resize(src, sx1, sy1, sx2, sy2,
pixels, width, height, dx1, dy1, dx2, dy2, mode);
}
}
//////////////////////////////////////////////////////////////
// COPYING IMAGE DATA
/**
* Duplicate an image, returns new PImage object.
* The pixels[] array for the new object will be unique
* and recopied from the source image.
*/
public Object clone() throws CloneNotSupportedException { // ignore
PImage c = (PImage) super.clone();
// super.clone() will only copy the reference to the pixels
// array, so this will do a proper duplication of it instead.
c.pixels = new int[width * height];
System.arraycopy(pixels, 0, c.pixels, 0, pixels.length);
// return the goods
return c;
}
/**
* Duplicate an image, returns new object
*/
/*
public PImage duplicate() {
PImage c = new PImage(new int[pixels.length], width, height, format);
System.arraycopy(pixels, 0, c.pixels, 0, pixels.length);
return c;
}
*/
/**
* Duplicate and resize image
*/
/*
public PImage duplicate(int newWidth, int newHeight) {
PImage dupe = new PImage(new int[newWidth * newHeight],
newWidth, newHeight, format);
dupe.copy(this, 0, 0, width - 1, height - 1,
0, 0, newWidth - 1, newHeight - 1);
return dupe;
}
*/
/**
* Check to see if two rectangles intersect one another
*/
boolean intersect(int sx1, int sy1, int sx2, int sy2,
int dx1, int dy1, int dx2, int dy2) {
int sw = sx2 - sx1 + 1;
int sh = sy2 - sy1 + 1;
int dw = dx2 - dx1 + 1;
int dh = dy2 - dy1 + 1;
if (dx1 < sx1) {
dw += dx1 - sx1;
if (dw > sw) {
dw = sw;
}
} else {
int w = sw + sx1 - dx1;
if (dw > w) {
dw = w;
}
}
if (dy1 < sy1) {
dh += dy1 - sy1;
if (dh > sh) {
dh = sh;
}
} else {
int h = sh + sy1 - dy1;
if (dh > h) {
dh = h;
}
}
return !(dw <= 0 || dh <= 0);
}
//////////////////////////////////////////////////////////////
/**
* Internal blitter/resizer/copier from toxi.
* Uses bilinear filtering if smooth() has been enabled
* 'mode' determines the blending mode used in the process.
*/
private void blit_resize(PImage img,
int srcX1, int srcY1, int srcX2, int srcY2,
int[] destPixels, int screenW, int screenH,
int destX1, int destY1, int destX2, int destY2,
int mode) {
if (srcX1 < 0) srcX1 = 0;
if (srcY1 < 0) srcY1 = 0;
if (srcX2 >= img.width) srcX2 = img.width - 1;
if (srcY2 >= img.width) srcY2 = img.height - 1;
int srcW = srcX2 - srcX1;
int srcH = srcY2 - srcY1;
int destW = destX2 - destX1;
int destH = destY2 - destY1;
if (!smooth) {
srcW++; srcH++;
}
if (destW <= 0 || destH <= 0 ||
srcW <= 0 || srcH <= 0 ||
destX1 >= screenW || destY1 >= screenH ||
srcX1 >= img.width || srcY1 >= img.height) {
return;
}
int dx = (int) (srcW / (float) destW * PRECISIONF);
int dy = (int) (srcH / (float) destH * PRECISIONF);
srcXOffset = (int) (destX1 < 0 ? -destX1 * dx : srcX1 * PRECISIONF);
srcYOffset = (int) (destY1 < 0 ? -destY1 * dy : srcY1 * PRECISIONF);
if (destX1 < 0) {
destW += destX1;
destX1 = 0;
}
if (destY1 < 0) {
destH += destY1;
destY1 = 0;
}
destW = low(destW, screenW - destX1);
destH = low(destH, screenH - destY1);
int destOffset = destY1 * screenW + destX1;
srcBuffer = img.pixels;
if (smooth) {
// use bilinear filtering
iw = img.width;
iw1 = img.width - 1;
ih1 = img.height - 1;
switch (mode) {
case BLEND:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_multiply(destPixels[destOffset + x], filter_bilinear());
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case ADD:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_add_pin(destPixels[destOffset + x], filter_bilinear());
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case SUBTRACT:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_sub_pin(destPixels[destOffset + x], filter_bilinear());
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case LIGHTEST:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_lightest(destPixels[destOffset + x], filter_bilinear());
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case DARKEST:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_darkest(destPixels[destOffset + x], filter_bilinear());
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case REPLACE:
for (int y = 0; y < destH; y++) {
filter_new_scanline();
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] = filter_bilinear();
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
}
} else {
// nearest neighbour scaling (++fast!)
switch (mode) {
case BLEND:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_multiply(destPixels[destOffset + x],
srcBuffer[sY + (sX >> PRECISIONB)]);
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case ADD:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_add_pin(destPixels[destOffset + x],
srcBuffer[sY + (sX >> PRECISIONB)]);
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case SUBTRACT:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_sub_pin(destPixels[destOffset + x],
srcBuffer[sY + (sX >> PRECISIONB)]);
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case LIGHTEST:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_lightest(destPixels[destOffset + x],
srcBuffer[sY + (sX >> PRECISIONB)]);
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case DARKEST:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] =
blend_darkest(destPixels[destOffset + x],
srcBuffer[sY + (sX >> PRECISIONB)]);
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
case REPLACE:
for (int y = 0; y < destH; y++) {
sX = srcXOffset;
sY = (srcYOffset >> PRECISIONB) * img.width;
for (int x = 0; x < destW; x++) {
destPixels[destOffset + x] = srcBuffer[sY + (sX >> PRECISIONB)];
sX += dx;
}
destOffset += screenW;
srcYOffset += dy;
}
break;
}
}
}
private void filter_new_scanline() {
sX = srcXOffset;
fracV = srcYOffset & PREC_MAXVAL;
ifV = PREC_MAXVAL - fracV;
v1 = (srcYOffset >> PRECISIONB) * iw;
v2 = low((srcYOffset >> PRECISIONB) + 1, ih1) * iw;
}
private int filter_bilinear() {
fracU = sX & PREC_MAXVAL;
ifU = PREC_MAXVAL - fracU;
ul = (ifU * ifV) >> PRECISIONB;
ll = (ifU * fracV) >> PRECISIONB;
ur = (fracU * ifV) >> PRECISIONB;
lr = (fracU * fracV) >> PRECISIONB;
u1 = (sX >> PRECISIONB);
u2 = low(u1 + 1, iw1);
// get color values of the 4 neighbouring texels
cUL = srcBuffer[v1 + u1];
cUR = srcBuffer[v1 + u2];
cLL = srcBuffer[v2 + u1];
cLR = srcBuffer[v2 + u2];
r = ((ul*((cUL&RED_MASK)>>16) + ll*((cLL&RED_MASK)>>16) +
ur*((cUR&RED_MASK)>>16) + lr*((cLR&RED_MASK)>>16))
<< PREC_RED_SHIFT) & RED_MASK;
g = ((ul*(cUL&GREEN_MASK) + ll*(cLL&GREEN_MASK) +
ur*(cUR&GREEN_MASK) + lr*(cLR&GREEN_MASK))
>>> PRECISIONB) & GREEN_MASK;
b = (ul*(cUL&BLUE_MASK) + ll*(cLL&BLUE_MASK) +
ur*(cUR&BLUE_MASK) + lr*(cLR&BLUE_MASK))
>>> PRECISIONB;
a = ((ul*((cUL&ALPHA_MASK)>>>24) + ll*((cLL&ALPHA_MASK)>>>24) +
ur*((cUR&ALPHA_MASK)>>>24) + lr*((cLR&ALPHA_MASK)>>>24))
<< PREC_ALPHA_SHIFT) & ALPHA_MASK;
return a | r | g | b;
}
//////////////////////////////////////////////////////////////
// internal blending methods
private static int low(int a, int b) {
return (a < b) ? a : b;
}
private static int high(int a, int b) {
return (a > b) ? a : b;
}
private float frac(float x) {
return (x - (int) x);
}
/**
* generic linear interpolation
*/
private static int mix(int a, int b, int f) {
return a + (((b - a) * f) >> 8);
}
/////////////////////////////////////////////////////////////
// BLEND MODE IMPLEMENTIONS
private static int blend_multiply(int a, int b) {
int f = (b & ALPHA_MASK) >>> 24;
return (low(((a & ALPHA_MASK) >>> 24) + f, 0xff) << 24 |
mix(a & RED_MASK, b & RED_MASK, f) & RED_MASK |
mix(a & GREEN_MASK, b & GREEN_MASK, f) & GREEN_MASK |
mix(a & BLUE_MASK, b & BLUE_MASK, f));
}
/**
* additive blend with clipping
*/
private static int blend_add_pin(int a, int b) {
int f = (b & ALPHA_MASK) >>> 24;
return (low(((a & ALPHA_MASK) >>> 24) + f, 0xff) << 24 |
low(((a & RED_MASK) +
((b & RED_MASK) >> 8) * f), RED_MASK) & RED_MASK |
low(((a & GREEN_MASK) +
((b & GREEN_MASK) >> 8) * f), GREEN_MASK) & GREEN_MASK |
low((a & BLUE_MASK) +
(((b & BLUE_MASK) * f) >> 8), BLUE_MASK));
}
/**
* subtractive blend with clipping
*/
private static int blend_sub_pin(int a, int b) {
int f = (b & ALPHA_MASK) >>> 24;
return (low(((a & ALPHA_MASK) >>> 24) + f, 0xff) << 24 |
high(((a & RED_MASK) - ((b & RED_MASK) >> 8) * f),
GREEN_MASK) & RED_MASK |
high(((a & GREEN_MASK) - ((b & GREEN_MASK) >> 8) * f),
BLUE_MASK) & GREEN_MASK |
high((a & BLUE_MASK) - (((b & BLUE_MASK) * f) >> 8), 0));
}
/**
* only returns the blended lightest colour
*/
private static int blend_lightest(int a, int b) {
int f = (b & ALPHA_MASK) >>> 24;
return (low(((a & ALPHA_MASK) >>> 24) + f, 0xff) << 24 |
high(a & RED_MASK, ((b & RED_MASK) >> 8) * f) & RED_MASK |
high(a & GREEN_MASK, ((b & GREEN_MASK) >> 8) * f) & GREEN_MASK |
high(a & BLUE_MASK, ((b & BLUE_MASK) * f) >> 8));
}
/**
* only returns the blended darkest colour
*/
private static int blend_darkest(int a, int b) {
int f = (b & ALPHA_MASK) >>> 24;
return (low(((a & ALPHA_MASK) >>> 24) + f, 0xff) << 24 |
mix(a & RED_MASK,
low(a & RED_MASK,
((b & RED_MASK) >> 8) * f), f) & RED_MASK |
mix(a & GREEN_MASK,
low(a & GREEN_MASK,
((b & GREEN_MASK) >> 8) * f), f) & GREEN_MASK |
mix(a & BLUE_MASK,
low(a & BLUE_MASK,
((b & BLUE_MASK) * f) >> 8), f));
}
//////////////////////////////////////////////////////////////
// FILE I/O
static byte tiff_header[] = {
77, 77, 0, 42, 0, 0, 0, 8, 0, 9, 0, -2, 0, 4, 0, 0, 0, 1, 0, 0,
0, 0, 1, 0, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 3, 0, 0, 0, 1,
0, 0, 0, 0, 1, 2, 0, 3, 0, 0, 0, 3, 0, 0, 0, 122, 1, 6, 0, 3, 0,
0, 0, 1, 0, 2, 0, 0, 1, 17, 0, 4, 0, 0, 0, 1, 0, 0, 3, 0, 1, 21,
0, 3, 0, 0, 0, 1, 0, 3, 0, 0, 1, 22, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0,
1, 23, 0, 4, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 8, 0, 8
};
static void write_tiff(OutputStream output, int pixels[],
int width, int height) throws IOException {
byte tiff[] = new byte[768];
System.arraycopy(tiff_header, 0, tiff, 0, tiff_header.length);
tiff[30] = (byte) ((width >> 8) & 0xff);
tiff[31] = (byte) ((width) & 0xff);
tiff[42] = tiff[102] = (byte) ((height >> 8) & 0xff);
tiff[43] = tiff[103] = (byte) ((height) & 0xff);
int count = width*height*3;
tiff[114] = (byte) ((count >> 24) & 0xff);
tiff[115] = (byte) ((count >> 16) & 0xff);
tiff[116] = (byte) ((count >> 8) & 0xff);
tiff[117] = (byte) ((count) & 0xff);
output.write(tiff);
for (int i = 0; i < pixels.length; i++) {
output.write((pixels[i] >> 16) & 0xff);
output.write((pixels[i] >> 8) & 0xff);
output.write(pixels[i] & 0xff);
}
output.flush();
}
/**
* [toxi 030902]
* Creates a Targa32 formatted byte sequence of specified pixel buffer
*
* [fry 030917]
* Modified to write directly to OutputStream, because of
* memory issues with first making an array of the data.
* tga spec: http://organicbit.com/closecombat/formats/tga.html
*/
static void write_targa(OutputStream output, int pixels[],
int width, int height) throws IOException {
byte header[] = new byte[18];
// set header info
header[2] = 0x02;
header[12] = (byte) (width & 0xff);
header[13] = (byte) (width >> 8);
header[14] = (byte) (height & 0xff);
header[15] = (byte) (height >> 8);
header[16] = 32; // bits per pixel
header[17] = 8; // bits per colour component
output.write(header);
int index = (height-1) * width;
for (int y = height-1; y >= 0; y--) {
for (int x = 0; x < width; x++) {
int col = pixels[index + x];
output.write(col & 0xff);
output.write(col >> 8 & 0xff);
output.write(col >> 16 & 0xff);
output.write(col >>> 24 & 0xff);
}
index -= width;
}
output.flush();
}
public void save(String filename) {
try {
OutputStream os = null;
if (filename.toLowerCase().endsWith(".tga")) {
os = new BufferedOutputStream(new FileOutputStream(filename), 32768);
write_targa(os, pixels, width, height);
} else {
if (!filename.toLowerCase().endsWith(".tif") &&
!filename.toLowerCase().endsWith(".tiff")) {
// if no .tif extension, add it..
filename += ".tif";
}
os = new BufferedOutputStream(new FileOutputStream(filename), 32768);
write_tiff(os, pixels, width, height);
}
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void smooth() {
smooth = true;
}
public void noSmooth() {
smooth = false;
}
/**
* mode is one of CORNERS, CORNER, CENTER
*/
public void imageMode(int mode) {
image_mode = mode;
}
}
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