public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
if (src.getSampleModel().getDataType() != DataBuffer.TYPE_INT
|| dstIn.getSampleModel().getDataType() != DataBuffer.TYPE_INT
|| dstOut.getSampleModel().getDataType() != DataBuffer.TYPE_INT) {
throw new IllegalStateException("Source and destination must store pixels as INT.");
}
int width = Math.min(src.getWidth(), dstIn.getWidth());
int height = Math.min(src.getHeight(), dstIn.getHeight());
float alpha = composite.getAlpha();
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;
int[] result = blender.blend(srcPixel, dstPixel);
// 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);
}
}
public static Blender getBlenderFor(BlendComposite composite) {
switch (composite.getMode()) {
case NORMAL:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
if (src[3] == 0) {
return dst;
}
return src;
}
};
case MULTIPLY:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
// white stays white.
if (src[3] == 0) {
return dst;
}
return new int[] {
(src[0] * dst[0]) >> 8,
(src[1] * dst[1]) >> 8,
(src[2] * dst[2]) >> 8,
Math.min(255, src[3] + dst[3])
};
}
};
case ADD:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.min(255, src[0] + dst[0]),
Math.min(255, src[1] + dst[1]),
Math.min(255, src[2] + dst[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case AVERAGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
(src[0] + dst[0]) >> 1,
(src[1] + dst[1]) >> 1,
(src[2] + dst[2]) >> 1,
Math.min(255, src[3] + dst[3])
};
}
};
case BLUE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {dst[0], src[1], dst[2], Math.min(255, src[3] + dst[3])};
}
};
case COLOR:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
int[] result = new int[4];
HSLtoRGB(srcHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case COLOR_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
src[0] == 0 ? 0 : Math.max(0, 255 - (((255 - dst[0]) << 8) / src[0])),
src[1] == 0 ? 0 : Math.max(0, 255 - (((255 - dst[1]) << 8) / src[1])),
src[2] == 0 ? 0 : Math.max(0, 255 - (((255 - dst[2]) << 8) / src[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case COLOR_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
src[0] == 255 ? 255 : Math.min((dst[0] << 8) / (255 - src[0]), 255),
src[1] == 255 ? 255 : Math.min((dst[1] << 8) / (255 - src[1]), 255),
src[2] == 255 ? 255 : Math.min((dst[2] << 8) / (255 - src[2]), 255),
Math.min(255, src[3] + dst[3])
};
}
};
case DARKEN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.min(src[0], dst[0]),
Math.min(src[1], dst[1]),
Math.min(src[2], dst[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case DIFFERENCE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.abs(dst[0] - src[0]),
Math.abs(dst[1] - src[1]),
Math.abs(dst[2] - src[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case EXCLUSION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] + src[0] - (dst[0] * src[0] >> 7),
dst[1] + src[1] - (dst[1] * src[1] >> 7),
dst[2] + src[2] - (dst[2] * src[2] >> 7),
Math.min(255, src[3] + dst[3])
};
}
};
case FREEZE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
src[0] == 0 ? 0 : Math.max(0, 255 - (255 - dst[0]) * (255 - dst[0]) / src[0]),
src[1] == 0 ? 0 : Math.max(0, 255 - (255 - dst[1]) * (255 - dst[1]) / src[1]),
src[2] == 0 ? 0 : Math.max(0, 255 - (255 - dst[2]) * (255 - dst[2]) / src[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case GLOW:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] == 255 ? 255 : Math.min(255, src[0] * src[0] / (255 - dst[0])),
dst[1] == 255 ? 255 : Math.min(255, src[1] * src[1] / (255 - dst[1])),
dst[2] == 255 ? 255 : Math.min(255, src[2] * src[2] / (255 - dst[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case GREEN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {dst[0], dst[1], src[2], Math.min(255, src[3] + dst[3])};
}
};
case HARD_LIGHT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
if (src[3] == 0) {
return dst;
}
return new int[] {
src[0] < 128 ? dst[0] * src[0] >> 7 : 255 - ((255 - src[0]) * (255 - dst[0]) >> 7),
src[1] < 128 ? dst[1] * src[1] >> 7 : 255 - ((255 - src[1]) * (255 - dst[1]) >> 7),
src[2] < 128 ? dst[2] * src[2] >> 7 : 255 - ((255 - src[2]) * (255 - dst[2]) >> 7),
Math.min(255, src[3] + dst[3])
};
}
};
case HEAT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] == 0 ? 0 : Math.max(0, 255 - (255 - src[0]) * (255 - src[0]) / dst[0]),
dst[1] == 0 ? 0 : Math.max(0, 255 - (255 - src[1]) * (255 - src[1]) / dst[1]),
dst[2] == 0 ? 0 : Math.max(0, 255 - (255 - src[2]) * (255 - src[2]) / dst[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case HUE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
int[] result = new int[4];
HSLtoRGB(srcHSL[0], dstHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case INVERSE_COLOR_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] == 0 ? 0 : Math.max(0, 255 - (((255 - src[0]) << 8) / dst[0])),
dst[1] == 0 ? 0 : Math.max(0, 255 - (((255 - src[1]) << 8) / dst[1])),
dst[2] == 0 ? 0 : Math.max(0, 255 - (((255 - src[2]) << 8) / dst[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case INVERSE_COLOR_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] == 255 ? 255 : Math.min((src[0] << 8) / (255 - dst[0]), 255),
dst[1] == 255 ? 255 : Math.min((src[1] << 8) / (255 - dst[1]), 255),
dst[2] == 255 ? 255 : Math.min((src[2] << 8) / (255 - dst[2]), 255),
Math.min(255, src[3] + dst[3])
};
}
};
case LIGHTEN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.max(src[0], dst[0]),
Math.max(src[1], dst[1]),
Math.max(src[2], dst[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case LUMINOSITY:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
int[] result = new int[4];
HSLtoRGB(dstHSL[0], dstHSL[1], srcHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case NEGATION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
255 - Math.abs(255 - dst[0] - src[0]),
255 - Math.abs(255 - dst[1] - src[1]),
255 - Math.abs(255 - dst[2] - src[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case OVERLAY:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
// screening with black leaves the underlying colour unchanged.
if (src[3] == 0) {
return dst;
}
return new int[] {
dst[0] < 128
? (dst[0] * src[0]) >> 7
: 255 - ((255 - dst[0]) * (255 - src[0]) >> 7),
dst[1] < 128 ? dst[1] * src[1] >> 7 : 255 - ((255 - dst[1]) * (255 - src[1]) >> 7),
dst[2] < 128
? (dst[2] * src[2]) >> 7
: 255 - ((255 - dst[2]) * (255 - src[2]) >> 7),
Math.min(255, dst[3])
};
// return dst;
}
};
case RED:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {src[0], dst[1], dst[2], Math.min(255, src[3] + dst[3])};
}
};
case REFLECT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
src[0] == 255 ? 255 : Math.min(255, dst[0] * dst[0] / (255 - src[0])),
src[1] == 255 ? 255 : Math.min(255, dst[1] * dst[1] / (255 - src[1])),
src[2] == 255 ? 255 : Math.min(255, dst[2] * dst[2] / (255 - src[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SATURATION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
int[] result = new int[4];
HSLtoRGB(dstHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case SCREEN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
// screening with black leaves the underlying colour unchanged.
if ((src[0] == 0 && src[1] == 0 && src[2] == 0)) {
return dst;
}
// screening any colour with white, produces white.
if ((dst[0] != 255 && dst[1] != 255 && dst[2] != 255)) {
int[] value =
new int[] {
255 - ((255 - src[0]) * (255 - dst[0]) >> 8),
255 - ((255 - src[1]) * (255 - dst[1]) >> 8),
255 - ((255 - src[2]) * (255 - dst[2]) >> 8),
Math.min(255, src[3] + (dst[3]))
};
return value;
}
return src;
}
};
case SOFT_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
dst[0] + src[0] < 256
? (dst[0] == 255 ? 255 : Math.min(255, (src[0] << 7) / (255 - dst[0])))
: Math.max(0, 255 - (((255 - dst[0]) << 7) / src[0])),
dst[1] + src[1] < 256
? (dst[1] == 255 ? 255 : Math.min(255, (src[1] << 7) / (255 - dst[1])))
: Math.max(0, 255 - (((255 - dst[1]) << 7) / src[1])),
dst[2] + src[2] < 256
? (dst[2] == 255 ? 255 : Math.min(255, (src[2] << 7) / (255 - dst[2])))
: Math.max(0, 255 - (((255 - dst[2]) << 7) / src[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SOFT_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
if (src[3] == 0) {
return dst;
}
return new int[] {
dst[0] + src[0] < 256
? (src[0] == 255 ? 255 : Math.min(255, (dst[0] << 7) / (255 - src[0])))
: Math.max(0, 255 - (((255 - src[0]) << 7) / dst[0])),
dst[1] + src[1] < 256
? (src[1] == 255 ? 255 : Math.min(255, (dst[1] << 7) / (255 - src[1])))
: Math.max(0, 255 - (((255 - src[1]) << 7) / dst[1])),
dst[2] + src[2] < 256
? (src[2] == 255 ? 255 : Math.min(255, (dst[2] << 7) / (255 - src[2])))
: Math.max(0, 255 - (((255 - src[2]) << 7) / dst[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SOFT_LIGHT:
break;
case STAMP:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.max(0, Math.min(255, dst[0] + 2 * src[0] - 256)),
Math.max(0, Math.min(255, dst[1] + 2 * src[1] - 256)),
Math.max(0, Math.min(255, dst[2] + 2 * src[2] - 256)),
Math.min(255, src[3] + dst[3])
};
}
};
case SUBTRACT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst) {
return new int[] {
Math.max(0, src[0] + dst[0] - 256),
Math.max(0, src[1] + dst[1] - 256),
Math.max(0, src[2] + dst[2] - 256),
Math.min(255, src[3] + dst[3])
};
}
};
}
throw new IllegalArgumentException("Blender not implement for " + composite.getMode().name());
}