public void DecodeGif()
{
decoded = new Dictionary <ImageDescriptor, byte[]>();
frameCount = parser.Blocks.Count(i => i is ImageDescriptor);
// var decodeProgress = new DecodeProgress { FrameCount = frameCount };
for (var i = 0; i < parser.Blocks.Count; i++)
{
var imageDescriptor = parser.Blocks[i] as ImageDescriptor;
if (imageDescriptor == null)
{
continue;
}
var data = (TableBasedImageData)parser.Blocks[i + 1 + imageDescriptor.LocalColorTableFlag];
// ThreadPool.QueueUserWorkItem(context =>
// {
// if (decodeProgress.Completed || decodeProgress.Exception != null) return;
//
byte[] colorIndexes;
// try
// {
colorIndexes = LzwDecoder.Decode(data.ImageData, data.LzwMinimumCodeSize);
// }
// catch (Exception e)
// {
// decodeProgress.Exception = e;
// decodeProgress.Completed = true;
// onProgress(decodeProgress);
// return;
// }
// lock (decoded)
// {
decoded.Add(imageDescriptor, colorIndexes);
// decodeProgress.Progress++;
// if (decoded.Count == frameCount)
// {
// try
// {
// decodeProgress.Gif = CompleteDecode(parser, decoded);
// decodeProgress.Completed = true;
// }
// catch (Exception e)
// {
// decodeProgress.Exception = e;
// decodeProgress.Completed = true;
// }
// }
//
// onProgress(decodeProgress);
// }
// });
}
}
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;
}
private static GifFrame DecodeFrame(GraphicControlExtension extension, ImageDescriptor descriptor, TableBasedImageData data, bool filled, int width, int height, Color32[] state, Color32[] colorTable)
{
var colorIndexes = LzwDecoder.Decode(data.ImageData, data.LzwMinimumCodeSize);
return(DecodeFrame(extension, descriptor, colorIndexes, filled, width, height, state, colorTable));
}
/// <summary>
/// Decode byte array in multiple threads.
/// </summary>
public static void DecodeParallel(byte[] bytes, Action <DecodeProgress> onProgress) // TODO: Refact
{
if (_free)
{
throw new Exception("The Free version doesn't support this feature. Please consider buying the Full version of Power GIF.");
}
GifParser parser;
try
{
parser = new GifParser(bytes);
}
catch (Exception e)
{
onProgress(new DecodeProgress {
Exception = e, Completed = true
});
return;
}
var decoded = new Dictionary <ImageDescriptor, byte[]>();
var frameCount = parser.Blocks.Count(i => i is ImageDescriptor);
var decodeProgress = new DecodeProgress {
FrameCount = frameCount
};
for (var i = 0; i < parser.Blocks.Count; i++)
{
var imageDescriptor = parser.Blocks[i] as ImageDescriptor;
if (imageDescriptor == null)
{
continue;
}
var data = (TableBasedImageData)parser.Blocks[i + 1 + imageDescriptor.LocalColorTableFlag];
ThreadPool.QueueUserWorkItem(context =>
{
if (decodeProgress.Completed || decodeProgress.Exception != null)
{
return;
}
byte[] colorIndexes;
try
{
colorIndexes = LzwDecoder.Decode(data.ImageData, data.LzwMinimumCodeSize);
}
catch (Exception e)
{
decodeProgress.Exception = e;
decodeProgress.Completed = true;
onProgress(decodeProgress);
return;
}
lock (decoded)
{
decoded.Add(imageDescriptor, colorIndexes);
decodeProgress.Progress++;
if (decoded.Count == frameCount)
{
try
{
decodeProgress.Gif = CompleteDecode(parser, decoded);
decodeProgress.Completed = true;
}
catch (Exception e)
{
decodeProgress.Exception = e;
decodeProgress.Completed = true;
}
}
onProgress(decodeProgress);
}
});
}
}
