/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
*/
public BufferedImage filter(BufferedImage src, BufferedImage dst) {
if (src == null) {
throw new NullPointerException("src image is null");
}
if (src == dst) {
throw new IllegalArgumentException("src image cannot be the " + "same as the dst image");
}
boolean needToConvert = false;
ColorModel srcCM = src.getColorModel();
ColorModel dstCM;
BufferedImage origDst = dst;
if (srcCM instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel) srcCM;
src = icm.convertToIntDiscrete(src.getRaster(), false);
srcCM = src.getColorModel();
}
if (dst == null) {
dst = createCompatibleDestImage(src, null);
dstCM = srcCM;
origDst = dst;
} else {
dstCM = dst.getColorModel();
if (srcCM.getColorSpace().getType() != dstCM.getColorSpace().getType()) {
needToConvert = true;
dst = createCompatibleDestImage(src, null);
dstCM = dst.getColorModel();
} else if (dstCM instanceof IndexColorModel) {
dst = createCompatibleDestImage(src, null);
dstCM = dst.getColorModel();
}
}
java.awt.image.CropImageFilter cropfilter =
new java.awt.image.CropImageFilter(region.x, region.y, region.width, region.height);
Image returnImage =
Toolkit.getDefaultToolkit()
.createImage(new java.awt.image.FilteredImageSource(src.getSource(), cropfilter));
dst = ImageConverter.convertImage(returnImage);
origDst = dst;
if (needToConvert) {
ColorConvertOp ccop = new ColorConvertOp(hints);
ccop.filter(dst, origDst);
} else if (origDst != dst) {
java.awt.Graphics2D g2 = origDst.createGraphics();
try {
g2.drawImage(dst, 0, 0, null);
} finally {
g2.dispose();
}
}
return origDst;
}
