public IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType, ImageWriteParam param) {
GIFWritableImageMetadata imageMetadata = new GIFWritableImageMetadata();
// Image dimensions
SampleModel sampleModel = imageType.getSampleModel();
Rectangle sourceBounds = new Rectangle(sampleModel.getWidth(), sampleModel.getHeight());
Dimension destSize = new Dimension();
computeRegions(sourceBounds, destSize, param);
imageMetadata.imageWidth = destSize.width;
imageMetadata.imageHeight = destSize.height;
// Interlacing
if (param != null
&& param.canWriteProgressive()
&& param.getProgressiveMode() == ImageWriteParam.MODE_DISABLED) {
imageMetadata.interlaceFlag = false;
} else {
imageMetadata.interlaceFlag = true;
}
// Local color table
ColorModel colorModel = imageType.getColorModel();
imageMetadata.localColorTable = createColorTable(colorModel, sampleModel);
// Transparency
if (colorModel instanceof IndexColorModel) {
int transparentIndex = ((IndexColorModel) colorModel).getTransparentPixel();
if (transparentIndex != -1) {
imageMetadata.transparentColorFlag = true;
imageMetadata.transparentColorIndex = transparentIndex;
}
}
return imageMetadata;
}
