if (initCodeSize == 1) {
initCodeSize++;
}
stream.write(initCodeSize);
LZWCompressor compressor =
new LZWCompressor(stream, initCodeSize, false);
/* At this moment we know that input image is indexed image.
* We can directly copy data iff:
* - no subsampling required (periodX = 1, periodY = 0)
* - we can access data directly (image is non-tiled,
* i.e. image data are in single block)
* - we can calculate offset in data buffer (next 3 lines)
*/
boolean isOptimizedCase =
periodX == 1 && periodY == 1 &&
image.getNumXTiles() == 1 && image.getNumYTiles() == 1 &&
sampleModel instanceof ComponentSampleModel &&
image.getTile(0, 0) instanceof ByteComponentRaster &&
image.getTile(0, 0).getDataBuffer() instanceof DataBufferByte;
int numRowsWritten = 0;
int progressReportRowPeriod = Math.max(destHeight/20, 1);
processImageStarted(imageIndex);
if (interlaceFlag) {
if (DEBUG) System.out.println("Writing interlaced");
if (isOptimizedCase) {
ByteComponentRaster tile =
(ByteComponentRaster)image.getTile(0, 0);
byte[] data = ((DataBufferByte)tile.getDataBuffer()).getData();
ComponentSampleModel csm =
(ComponentSampleModel)tile.getSampleModel();
int offset = csm.getOffset(sourceXOffset, sourceYOffset, 0);
// take into account the raster data offset
offset += tile.getDataOffset(0);
int lineStride = csm.getScanlineStride();
writeRowsOpt(data, offset, lineStride, compressor,
0, 8, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += destHeight/8;
writeRowsOpt(data, offset, lineStride, compressor,
4, 8, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += (destHeight - 4)/8;
writeRowsOpt(data, offset, lineStride, compressor,
2, 4, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += (destHeight - 2)/4;
writeRowsOpt(data, offset, lineStride, compressor,
1, 2, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
} else {
writeRows(image, compressor,
sourceXOffset, periodX,
sourceYOffset, 8*periodY,
sourceWidth,
0, 8, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += destHeight/8;
writeRows(image, compressor, sourceXOffset, periodX,
sourceYOffset + 4*periodY, 8*periodY,
sourceWidth,
4, 8, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += (destHeight - 4)/8;
writeRows(image, compressor, sourceXOffset, periodX,
sourceYOffset + 2*periodY, 4*periodY,
sourceWidth,
2, 4, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
if (abortRequested()) {
return;
}
numRowsWritten += (destHeight - 2)/4;
writeRows(image, compressor, sourceXOffset, periodX,
sourceYOffset + periodY, 2*periodY,
sourceWidth,
1, 2, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
}
} else {
if (DEBUG) System.out.println("Writing non-interlaced");
if (isOptimizedCase) {
Raster tile = image.getTile(0, 0);
byte[] data = ((DataBufferByte)tile.getDataBuffer()).getData();
ComponentSampleModel csm =
(ComponentSampleModel)tile.getSampleModel();
int offset = csm.getOffset(sourceXOffset, sourceYOffset, 0);
int lineStride = csm.getScanlineStride();
writeRowsOpt(data, offset, lineStride, compressor,
0, 1, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
} else {
writeRows(image, compressor,
sourceXOffset, periodX,
sourceYOffset, periodY,
sourceWidth,
0, 1, destWidth, destHeight,
numRowsWritten, progressReportRowPeriod);
}
}
if (abortRequested()) {
return;
}
processImageProgress(100.0F);
compressor.flush();
stream.write(0x00);
processImageComplete();
}