static void Main(string[] args)
{
using (Stream stream = File.Open(@"d:\splash_loading.gif", FileMode.Open))
{
GifParser parser = new GifParser();
parser.Initialize(stream);
}
}
public void LoadGif(string path)
{
Text = Caption + ": " + path;
g = GifParser.Parse(path);
UpdateList();
}
public void CreateGif()
{
parser = new GifParser(bytes);
}
/// <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);
}
});
}
}
/// <summary>
/// Get frame count. Can be used with DecodeIterator to display progress bar.
/// </summary>
public static int GetDecodeIteratorSize(byte[] bytes)
{
var parser = new GifParser(bytes);
return(parser.Blocks.Count(i => i is ImageDescriptor));
}
/// <summary>
/// Iterator can be used for large GIF-files in order to display progress bar.
/// </summary>
public static IEnumerable <GifFrame> DecodeIterator(byte[] bytes)
{
var parser = new GifParser(bytes);
var blocks = parser.Blocks;
var width = parser.LogicalScreenDescriptor.LogicalScreenWidth;
var height = parser.LogicalScreenDescriptor.LogicalScreenHeight;
var globalColorTable = parser.LogicalScreenDescriptor.GlobalColorTableFlag == 1 ? GetUnityColors(parser.GlobalColorTable) : null;
//var backgroundColor = globalColorTable?[parser.LogicalScreenDescriptor.BackgroundColorIndex] ?? EmptyColor;
GraphicControlExtension graphicControlExtension = null;
var state = new Color32[width * height];
var filled = false;
for (var j = 0; j < parser.Blocks.Count; j++)
{
if (blocks[j] is GraphicControlExtension)
{
graphicControlExtension = (GraphicControlExtension)blocks[j];
}
else if (blocks[j] is ImageDescriptor)
{
var imageDescriptor = (ImageDescriptor)blocks[j];
if (imageDescriptor.InterlaceFlag == 1)
{
throw new NotSupportedException("Interlacing is not supported!");
}
var colorTable = imageDescriptor.LocalColorTableFlag == 1 ? GetUnityColors((ColorTable)blocks[j + 1]) : globalColorTable;
var data = (TableBasedImageData)blocks[j + 1 + imageDescriptor.LocalColorTableFlag];
var frame = DecodeFrame(graphicControlExtension, imageDescriptor, data, filled, width, height, state, colorTable);
if (_free)
{
if (frame.Texture.width > 256 || frame.Texture.height > 256)
{
throw new Exception("The Free version has maximum supported size 256x256 px. Please consider buying the Full version of Power GIF.");
}
//if (++frames > 20) throw new Exception("The Free version is limited by 20 frames. Please consider buying the Full version of Power GIF.");
}
yield return(frame);
switch (frame.DisposalMethod)
{
case DisposalMethod.NoDisposalSpecified:
case DisposalMethod.DoNotDispose:
break;
case DisposalMethod.RestoreToBackgroundColor:
for (var i = 0; i < state.Length; i++)
{
state[i] = EmptyColor;
}
filled = true;
break;
case DisposalMethod.RestoreToPrevious: // 'state' was already copied before decoding current frame
filled = false;
break;
default:
throw new NotSupportedException($"Unknown disposal method: {frame.DisposalMethod}!");
}
}
}
}
private static Gif CompleteDecode(GifParser parser, IDictionary <ImageDescriptor, byte[]> decoded)
{
var globalColorTable = parser.LogicalScreenDescriptor.GlobalColorTableFlag == 1 ? GetUnityColors(parser.GlobalColorTable) : null;
//var backgroundColor = globalColorTable?[parser.LogicalScreenDescriptor.BackgroundColorIndex] ?? EmptyColor;
GraphicControlExtension gcExtension = null;
var width = parser.LogicalScreenDescriptor.LogicalScreenWidth;
var height = parser.LogicalScreenDescriptor.LogicalScreenHeight;
var state = new Color32[width * height];
var filled = false;
var frames = new List <GifFrame>();
for (var j = 0; j < parser.Blocks.Count; j++)
{
if (parser.Blocks[j] is GraphicControlExtension)
{
gcExtension = (GraphicControlExtension)parser.Blocks[j];
}
else if (parser.Blocks[j] is ImageDescriptor)
{
var imageDescriptor = (ImageDescriptor)parser.Blocks[j];
if (imageDescriptor.InterlaceFlag == 1)
{
throw new NotSupportedException("Interlacing is not supported!");
}
var colorTable = imageDescriptor.LocalColorTableFlag == 1 ? GetUnityColors((ColorTable)parser.Blocks[j + 1]) : globalColorTable;
var colorIndexes = decoded[imageDescriptor];
var frame = DecodeFrame(gcExtension, imageDescriptor, colorIndexes, filled, width, height, state, colorTable);
frames.Add(frame);
//if (frames.Count == 1 && globalColorTable != null)
//{
// if (gcExtension == null || gcExtension.TransparentColorFlag == 0 || gcExtension.TransparentColorIndex != parser.LogicalScreenDescriptor.BackgroundColorIndex)
// {
// backgroundColor = globalColorTable[parser.LogicalScreenDescriptor.BackgroundColorIndex];
// }
//}
switch (frame.DisposalMethod)
{
case DisposalMethod.NoDisposalSpecified:
case DisposalMethod.DoNotDispose:
break;
case DisposalMethod.RestoreToBackgroundColor:
for (var i = 0; i < state.Length; i++)
{
state[i] = EmptyColor;
}
filled = true;
break;
case DisposalMethod.RestoreToPrevious: // 'state' was already copied before decoding current frame
filled = false;
break;
default:
throw new NotSupportedException($"Unknown disposal method: {frame.DisposalMethod}!");
}
}
}
return(new Gif(frames));
}
public void GifParser_WithWikipediaExampleGifFile_YieldsExpectedElements()
{
////byte# hexadecimal text or
////(hex) value Meaning
////0: 47 49 46
//// 38 39 61 GIF89a Header
//// Logical Screen Descriptor
////6: 03 00 3 - logical screen width in pixels
////8: 05 00 5 - logical screen height in pixels
////A: F7 - GCT follows for 256 colors with resolution 3 x 8 bits/primary; the lowest 3 bits represent the bit depth minus 1, the highest true bit means that the GCT is present
////B: 00 0 - background color #0
////C: 00 - default pixel aspect ratio
//// R G B Global Color Table
////D: 00 00 00 0 0 0 - color #0 black
////10: 80 00 00 128 0 0 - color #1
//// : :
////85: 00 00 00 0 0 0 - color #40 black
//// : :
////30A: FF FF FF 255 255 255 - color #255 white
////30D: 21 F9 Graphic Control Extension (comment fields precede this in most files)
////30F: 04 4 - 4 bytes of GCE data follow
////310: 01 - there is a transparent background color (bit field; the lowest bit signifies transparency)
////311: 00 00 - delay for animation in hundredths of a second: not used
////313: 10 16 - color #16 is transparent
////314: 00 - end of GCE block
////315: 2C Image Descriptor
////316: 00 00 00 00 (0,0) - NW corner position of image in logical screen
////31A: 03 00 05 00 (3,5) - image width and height in pixels
////31E: 00 - no local color table
////31F: 08 8 Start of image - LZW minimum code size
////320: 0B 11 - 11 bytes of LZW encoded image data follow
////321: 00 51 FC 1B 28 70 A0 C1 83 01 01
////32C: 00 - end of image data
////32D: 3B GIF file terminator
var subject = new byte[]
{
0x47, 0x49, 0x46,
0x38, 0x39, 0x61,
0x03, 0x00,
0x05, 0x00,
0xF7,
0x00,
0x00,
0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF,
0x21, 0xF9,
0x04,
0x01,
0x00, 0x00,
0x10,
0x00,
0x2C,
0x00, 0x00, 0x00, 0x00,
0x03, 0x00, 0x05, 0x00,
0x00,
0x08,
0x0B,
0x00, 0x51, 0xFC, 0x1B, 0x28, 0x70, 0xA0, 0xC1, 0x83, 0x01, 0x01,
0x00,
0x3B,
};
List <GifElement> result;
using (var stream = new MemoryStream(subject))
{
result = GifParser.ReadGif(stream).ToList();
}
Assert.That(result.Count, Is.EqualTo(7));
var header = (Header)result[0];
Assert.That(header.Version, Is.EqualTo("89a"));
var logicalScreenDescriptor = (LogicalScreenDescriptor)result[1];
Assert.That(logicalScreenDescriptor.Width, Is.EqualTo(3));
Assert.That(logicalScreenDescriptor.Height, Is.EqualTo(5));
Assert.That(logicalScreenDescriptor.GlobalColorTableFlag, Is.True);
Assert.That(logicalScreenDescriptor.SizeOfGlobalColorTable, Is.EqualTo(256));
Assert.That(logicalScreenDescriptor.ColorResolution, Is.EqualTo(8));
Assert.That(logicalScreenDescriptor.BackgroundColorIndex, Is.EqualTo(0));
Assert.That(logicalScreenDescriptor.PixelAspectRatio, Is.Null);
var globalColorTable = (GlobalColorTable)result[2];
Assert.That(globalColorTable.Value.Length, Is.EqualTo(256));
Assert.That(globalColorTable.Value, Is.EqualTo(
new[] { Color.Black, Color.FromArgb(128, 0, 0) }.Concat(Enumerable.Repeat(Color.Black, 253)).Concat(new[] { Color.White }).ToArray()).Using(ColorComparer));
var graphicsControlExtension = (GraphicsControlExtension)result[3];
Assert.That(graphicsControlExtension.TransparencyFlag, Is.True);
Assert.That(graphicsControlExtension.UserInputFlag, Is.False);
Assert.That(graphicsControlExtension.DisposalMethod, Is.EqualTo(0));
Assert.That(graphicsControlExtension.DelayTime, Is.EqualTo(0));
Assert.That(graphicsControlExtension.TransparencyIndex, Is.EqualTo(16));
var imageDescriptor = (ImageDescriptor)result[4];
Assert.That(imageDescriptor.Left, Is.EqualTo(0));
Assert.That(imageDescriptor.Top, Is.EqualTo(0));
Assert.That(imageDescriptor.Width, Is.EqualTo(3));
Assert.That(imageDescriptor.Height, Is.EqualTo(5));
Assert.That(imageDescriptor.LocalColorTableFlag, Is.False);
Assert.That(imageDescriptor.SortFlag, Is.False);
Assert.That(imageDescriptor.InterlaceFlag, Is.False);
Assert.That(imageDescriptor.SizeOfLocalColorTable, Is.EqualTo(0));
var raster = (Raster)result[5];
Assert.That(raster.Value.Width, Is.EqualTo(3));
Assert.That(raster.Value.Height, Is.EqualTo(5));
Assert.That(raster.Value.GetPixel(0, 0), Is.EqualTo(Color.Black).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 0), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 0), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 1), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 1), Is.EqualTo(Color.Black).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 1), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 4), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 4), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 4), Is.EqualTo(Color.White).Using(ColorComparer));
var trailer = (Trailer)result[6];
}
