public WritableRaster copyData(WritableRaster wr) {
// Get my source.
CachableRed srcRed = (CachableRed) getSources().get(0);
CachableRed alphaRed = (CachableRed) getSources().get(1);
if (is_INT_PACK_BYTE_COMP(srcRed.getSampleModel(), alphaRed.getSampleModel()))
return INT_PACK_BYTE_COMP_Impl(wr);
ColorModel cm = srcRed.getColorModel();
if (cm.hasAlpha()) {
// Already has alpha channel so we use it.
srcRed.copyData(wr);
Rectangle rgn = wr.getBounds();
if (rgn.intersects(alphaRed.getBounds())) rgn = rgn.intersection(alphaRed.getBounds());
else return wr;
int[] wrData = null;
int[] alphaData = null;
Raster r = alphaRed.getData(rgn);
int w = rgn.width;
final int bands = wr.getSampleModel().getNumBands();
if (cm.isAlphaPremultiplied()) {
for (int y = rgn.y; y < rgn.y + rgn.height; y++) {
wrData = wr.getPixels(rgn.x, y, w, 1, wrData);
alphaData = r.getSamples(rgn.x, y, w, 1, 0, alphaData);
int i = 0, a, b;
// 4 is the most common case.
// 2 is probably next most common...
switch (bands) {
case 2:
for (int x = 0; x < alphaData.length; x++) {
a = alphaData[x] & 0xFF;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
}
break;
case 4:
for (int x = 0; x < alphaData.length; x++) {
a = alphaData[x] & 0xFF;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
}
break;
default:
for (int x = 0; x < alphaData.length; x++) {
a = alphaData[x] & 0xFF;
for (b = 0; b < bands; b++) {
wrData[i] = ((wrData[i] & 0xFF) * a) >> 8;
++i;
}
}
}
wr.setPixels(rgn.x, y, w, 1, wrData);
}
} else {
int b = srcRed.getSampleModel().getNumBands() - 1;
for (int y = rgn.y; y < rgn.y + rgn.height; y++) {
wrData = wr.getSamples(rgn.x, y, w, 1, b, wrData);
alphaData = r.getSamples(rgn.x, y, w, 1, 0, alphaData);
for (int i = 0; i < wrData.length; i++) {
wrData[i] = ((wrData[i] & 0xFF) * (alphaData[i] & 0xFF)) >> 8;
}
wr.setSamples(rgn.x, y, w, 1, b, wrData);
}
}
return wr;
}
// No alpha in source, so we hide the alpha channel in wr and
// have our source fill wr with color info...
int[] bands = new int[wr.getNumBands() - 1];
for (int i = 0; i < bands.length; i++) bands[i] = i;
WritableRaster subWr;
subWr =
wr.createWritableChild(
wr.getMinX(),
wr.getMinY(),
wr.getWidth(),
wr.getHeight(),
wr.getMinX(),
wr.getMinY(),
bands);
srcRed.copyData(subWr);
Rectangle rgn = wr.getBounds();
rgn = rgn.intersection(alphaRed.getBounds());
bands = new int[] {wr.getNumBands() - 1};
subWr = wr.createWritableChild(rgn.x, rgn.y, rgn.width, rgn.height, rgn.x, rgn.y, bands);
alphaRed.copyData(subWr);
return wr;
}
