@Override
public ImageTypeSpecifier getRawImageType(final int imageIndex) throws IOException {
checkBounds(imageIndex);
readHeader();
int channels = header.getChannels();
int paletteInfo = header.getPaletteInfo();
ColorSpace cs =
paletteInfo == PCX.PALETTEINFO_GRAY
? ColorSpace.getInstance(ColorSpace.CS_GRAY)
: ColorSpace.getInstance(ColorSpace.CS_sRGB);
switch (header.getBitsPerPixel()) {
case 1:
case 2:
case 4:
return ImageTypeSpecifiers.createFromIndexColorModel(header.getEGAPalette());
case 8:
// We may have IndexColorModel here for 1 channel images
if (channels == 1 && paletteInfo != PCX.PALETTEINFO_GRAY) {
IndexColorModel palette = getVGAPalette();
if (palette == null) {
throw new IIOException("Expected VGA palette not found");
}
return ImageTypeSpecifiers.createFromIndexColorModel(palette);
}
// PCX has 1 or 3 channels for 8 bit gray or 24 bit RGB, will be validated by
// ImageTypeSpecifier
return ImageTypeSpecifiers.createBanded(
cs,
createIndices(channels, 1),
createIndices(channels, 0),
DataBuffer.TYPE_BYTE,
false,
false);
case 24:
// Some sources says this is possible...
return ImageTypeSpecifiers.createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
case 32:
// Some sources says this is possible...
return ImageTypeSpecifiers.createFromBufferedImageType(BufferedImage.TYPE_4BYTE_ABGR);
default:
throw new IIOException("Unknown number of bytes per pixel: " + header.getBitsPerPixel());
}
}
