public boolean is_INT_PACK_BYTE_COMP(SampleModel srcSM, SampleModel alpSM) {
// Check SampleModel types DirectColorModel
if (!(srcSM instanceof SinglePixelPackedSampleModel)) return false;
if (!(alpSM instanceof ComponentSampleModel)) return false;
// Check transfer types
if (srcSM.getDataType() != DataBuffer.TYPE_INT) return false;
if (alpSM.getDataType() != DataBuffer.TYPE_BYTE) return false;
SinglePixelPackedSampleModel sppsm;
sppsm = (SinglePixelPackedSampleModel) srcSM;
int[] masks = sppsm.getBitMasks();
if (masks.length != 4) return false;
if (masks[0] != 0x00ff0000) return false;
if (masks[1] != 0x0000ff00) return false;
if (masks[2] != 0x000000ff) return false;
if (masks[3] != 0xff000000) return false;
ComponentSampleModel csm;
csm = (ComponentSampleModel) alpSM;
if (csm.getNumBands() != 1) return false;
if (csm.getPixelStride() != 1) return false;
return true;
}
public WritableRaster INT_PACK_BYTE_COMP_Impl(WritableRaster wr) {
// Get my source.
CachableRed srcRed = (CachableRed) getSources().get(0);
CachableRed alphaRed = (CachableRed) getSources().get(1);
// Already has alpha channel so we use it.
srcRed.copyData(wr);
Rectangle rgn = wr.getBounds();
rgn = rgn.intersection(alphaRed.getBounds());
Raster r = alphaRed.getData(rgn);
ComponentSampleModel csm;
csm = (ComponentSampleModel) r.getSampleModel();
final int alpScanStride = csm.getScanlineStride();
DataBufferByte alpDB = (DataBufferByte) r.getDataBuffer();
final int alpBase =
(alpDB.getOffset()
+ csm.getOffset(
rgn.x - r.getSampleModelTranslateX(), rgn.y - r.getSampleModelTranslateY()));
// Access the pixel data array
final byte[] alpPixels = alpDB.getBankData()[0];
SinglePixelPackedSampleModel sppsm;
sppsm = (SinglePixelPackedSampleModel) wr.getSampleModel();
final int srcScanStride = sppsm.getScanlineStride();
DataBufferInt srcDB = (DataBufferInt) wr.getDataBuffer();
final int srcBase =
(srcDB.getOffset()
+ sppsm.getOffset(
rgn.x - wr.getSampleModelTranslateX(), rgn.y - wr.getSampleModelTranslateY()));
// Access the pixel data array
final int[] srcPixels = srcDB.getBankData()[0];
ColorModel cm = srcRed.getColorModel();
if (cm.isAlphaPremultiplied()) {
// For alpha premult we need to multiply all comps.
for (int y = 0; y < rgn.height; y++) {
int sp = srcBase + y * srcScanStride;
int ap = alpBase + y * alpScanStride;
int end = sp + rgn.width;
while (sp < end) {
int a = ((int) alpPixels[ap++]) & 0xFF;
final int pix = srcPixels[sp];
srcPixels[sp] =
((((((pix >>> 24)) * a) & 0xFF00) << 16)
| (((((pix >>> 16) & 0xFF) * a) & 0xFF00) << 8)
| (((((pix >>> 8) & 0xFF) * a) & 0xFF00))
| (((((pix) & 0xFF) * a) & 0xFF00) >> 8));
sp++;
}
}
} else {
// For non-alpha premult we only need to multiply alpha.
for (int y = 0; y < rgn.height; y++) {
int sp = srcBase + y * srcScanStride;
int ap = alpBase + y * alpScanStride;
int end = sp + rgn.width;
while (sp < end) {
int a = ((int) alpPixels[ap++]) & 0xFF;
int sa = srcPixels[sp] >>> 24;
srcPixels[sp] = ((((sa * a) & 0xFF00) << 16) | srcPixels[sp] & 0x00FFFFFF);
sp++;
}
}
}
return wr;
}