private static void TransformFrame(IBitmapProcessor bitmapProcessor, ImageFrame frame)
{
var bitmapCopy = (Bitmap)frame.Bitmap.Clone();
frame.Bitmap.Dispose();
frame.Bitmap = bitmapProcessor.Process(bitmapCopy, frame.GetBackgroundColor().Color);
DefaultQuantizer.Quantize(frame.Bitmap, frame.GetPalette());
frame.ImageDescriptor.ImageWidth = (short)frame.Bitmap.Width;
frame.ImageDescriptor.ImageHeight = (short)frame.Bitmap.Height;
}
private static ImageFrame ReadImageFrame(Stream stream, byte[] globalColorTable, GraphicControlExtension graphicControlExtension)
{
var imageDescriptor = ImageDescriptor.Read(stream);
var imageFrame = new ImageFrame
{
ImageDescriptor = imageDescriptor,
LocalColorTable = globalColorTable,
GraphicControlExtension = graphicControlExtension
};
if (imageDescriptor.LocalColorTableFlag)
{
imageFrame.LocalColorTable = stream.ReadBytes(imageDescriptor.LocalColorTableSize * 3);
}
imageFrame.ColorDepth = stream.ReadByte();
var lzwDecoder = new LzwDecoder(stream);
var imageData = lzwDecoder.DecodeImageData(imageDescriptor.ImageWidth, imageDescriptor.ImageHeight, imageFrame.ColorDepth);
ApplicationData.Read(stream);
imageFrame.Bitmap = CreateBitmap(
imageData,
imageFrame.GetPalette(),
imageDescriptor.InterlaceFlag,
imageDescriptor.ImageWidth,
imageDescriptor.ImageHeight);
return imageFrame;
}