📄 blendcomposite.java
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*
* @return the blending mode used by this object
*/
public BlendingMode getMode() {
return mode;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return Float.floatToIntBits(alpha) * 31 + mode.ordinal();
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof BlendComposite)) {
return false;
}
BlendComposite bc = (BlendComposite) obj;
return mode == bc.mode && alpha == bc.alpha;
}
private static boolean checkComponentsOrder(ColorModel cm) {
if (cm instanceof DirectColorModel &&
cm.getTransferType() == DataBuffer.TYPE_INT) {
DirectColorModel directCM = (DirectColorModel) cm;
return directCM.getRedMask() == 0x00FF0000 &&
directCM.getGreenMask() == 0x0000FF00 &&
directCM.getBlueMask() == 0x000000FF &&
(directCM.getNumComponents() != 4 ||
directCM.getAlphaMask() == 0xFF000000);
}
return false;
}
/**
* {@inheritDoc}
*/
public CompositeContext createContext(ColorModel srcColorModel,
ColorModel dstColorModel,
RenderingHints hints) {
if (!checkComponentsOrder(srcColorModel) ||
!checkComponentsOrder(dstColorModel)) {
throw new RasterFormatException("Incompatible color models");
}
return new BlendingContext(this);
}
private static final class BlendingContext implements CompositeContext {
private final Blender blender;
private final BlendComposite composite;
private BlendingContext(BlendComposite composite) {
this.composite = composite;
this.blender = Blender.getBlenderFor(composite);
}
public void dispose() {
}
public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
int width = Math.min(src.getWidth(), dstIn.getWidth());
int height = Math.min(src.getHeight(), dstIn.getHeight());
float alpha = composite.getAlpha();
int[] result = new int[4];
int[] srcPixel = new int[4];
int[] dstPixel = new int[4];
int[] srcPixels = new int[width];
int[] dstPixels = new int[width];
for (int y = 0; y < height; y++) {
src.getDataElements(0, y, width, 1, srcPixels);
dstIn.getDataElements(0, y, width, 1, dstPixels);
for (int x = 0; x < width; x++) {
// pixels are stored as INT_ARGB
// our arrays are [R, G, B, A]
int pixel = srcPixels[x];
srcPixel[0] = (pixel >> 16) & 0xFF;
srcPixel[1] = (pixel >> 8) & 0xFF;
srcPixel[2] = (pixel ) & 0xFF;
srcPixel[3] = (pixel >> 24) & 0xFF;
pixel = dstPixels[x];
dstPixel[0] = (pixel >> 16) & 0xFF;
dstPixel[1] = (pixel >> 8) & 0xFF;
dstPixel[2] = (pixel ) & 0xFF;
dstPixel[3] = (pixel >> 24) & 0xFF;
blender.blend(srcPixel, dstPixel, result);
// mixes the result with the opacity
dstPixels[x] = ((int) (dstPixel[3] + (result[3] - dstPixel[3]) * alpha) & 0xFF) << 24 |
((int) (dstPixel[0] + (result[0] - dstPixel[0]) * alpha) & 0xFF) << 16 |
((int) (dstPixel[1] + (result[1] - dstPixel[1]) * alpha) & 0xFF) << 8 |
(int) (dstPixel[2] + (result[2] - dstPixel[2]) * alpha) & 0xFF;
}
dstOut.setDataElements(0, y, width, 1, dstPixels);
}
}
}
private static abstract class Blender {
public abstract void blend(int[] src, int[] dst, int[] result);
public static Blender getBlenderFor(BlendComposite composite) {
switch (composite.getMode()) {
case ADD:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.min(255, src[0] + dst[0]);
result[1] = Math.min(255, src[1] + dst[1]);
result[2] = Math.min(255, src[2] + dst[2]);
result[3] = Math.min(255, src[3] + dst[3]);
}
};
case AVERAGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = (src[0] + dst[0]) >> 1;
result[1] = (src[1] + dst[1]) >> 1;
result[2] = (src[2] + dst[2]) >> 1;
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case BLUE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0];
result[1] = src[1];
result[2] = dst[2];
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
ColorUtilities.HSLtoRGB(srcHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR_BURN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[0]) << 8) / src[0]));
result[1] = src[1] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[1]) << 8) / src[1]));
result[2] = src[2] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[2]) << 8) / src[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR_DODGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 255 ? 255 :
Math.min((dst[0] << 8) / (255 - src[0]), 255);
result[1] = src[1] == 255 ? 255 :
Math.min((dst[1] << 8) / (255 - src[1]), 255);
result[2] = src[2] == 255 ? 255 :
Math.min((dst[2] << 8) / (255 - src[2]), 255);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case DARKEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.min(src[0], dst[0]);
result[1] = Math.min(src[1], dst[1]);
result[2] = Math.min(src[2], dst[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case DIFFERENCE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.abs(dst[0] - src[0]);
result[1] = Math.abs(dst[1] - src[1]);
result[2] = Math.abs(dst[2] - src[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case EXCLUSION:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] + src[0] - (dst[0] * src[0] >> 7);
result[1] = dst[1] + src[1] - (dst[1] * src[1] >> 7);
result[2] = dst[2] + src[2] - (dst[2] * src[2] >> 7);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case FREEZE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[0]) * (255 - dst[0]) / src[0]);
result[1] = src[1] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[1]) * (255 - dst[1]) / src[1]);
result[2] = src[2] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[2]) * (255 - dst[2]) / src[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case GLOW:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] == 255 ? 255 :
Math.min(255, src[0] * src[0] / (255 - dst[0]));
result[1] = dst[1] == 255 ? 255 :
Math.min(255, src[1] * src[1] / (255 - dst[1]));
result[2] = dst[2] == 255 ? 255 :
Math.min(255, src[2] * src[2] / (255 - dst[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case GREEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0];
result[1] = dst[1];
result[2] = src[2];
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