/** Constructs a DirectRasterAccessor object */
public DirectRasterAccessor(Raster raster, ColorModel cm) {
DataBuffer db = raster.getDataBuffer();
offsetX = raster.getMinX() - raster.getSampleModelTranslateX();
offsetY = raster.getMinY() - raster.getSampleModelTranslateY();
if (!(db instanceof DataBufferByte)) {
throw new RuntimeException(
"DataBuffer of Raster not of correct type "
+ "(expected DataBufferByte, got "
+ db.getClass().getName()
+ ")");
}
DataBufferByte dbb = (DataBufferByte) db;
SampleModel sm = raster.getSampleModel();
if (!(sm instanceof MultiPixelPackedSampleModel)) {
throw new RuntimeException(
"SampleModel of Raster not of correct type "
+ "(expected MultiPixelPackedSampleModel, got "
+ sm.getClass().getName()
+ ")");
}
MultiPixelPackedSampleModel mppsm = (MultiPixelPackedSampleModel) sm;
data = dbb.getData();
scanlineStride = mppsm.getScanlineStride();
if (cm.getRGB(0) == Color.white.getRGB()) {
white = 0;
black = 1;
} else {
white = 1;
black = 0;
}
}
private void writeDataBuffer(DataOutput out, DataBuffer buffer) throws IOException {
if (buffer instanceof DataBufferInt) {
out.writeInt(DATA_BUFFER_INT);
writeDataBufferInt(out, (DataBufferInt) buffer);
} else throw new SGIORuntimeException("Unsupported DataBuffer " + buffer.getClass().getName());
}
