private BrushAnimator(Stream sourceStream, Uri sourceUri, GifDataStream metadata, RepeatBehavior repeatBehavior) : base(sourceStream, sourceUri, metadata, repeatBehavior)
{
Brush = new ImageBrush {
ImageSource = Bitmap
};
RepeatBehavior = _repeatBehavior;
}
private static async Task <Animator> CreateAsync(Stream sourceStream, Uri sourceUri, RepeatBehavior repeatBehavior, Image image)
{
Stream stream = sourceStream.AsBuffered();
GifDataStream metadata = await GifDataStream.ReadAsync(stream);
return(new Animator(stream, sourceUri, metadata, repeatBehavior, image));
}
private static Dictionary <int, Animator.GifPalette> CreatePalettes(GifDataStream metadata)
{
Dictionary <int, Animator.GifPalette> dictionary = new Dictionary <int, Animator.GifPalette>();
Color[] colorArray = (Color[])null;
if (metadata.Header.LogicalScreenDescriptor.HasGlobalColorTable)
{
colorArray = (Color[])Enumerable.ToArray <Color>(Enumerable.Select <GifColor, Color>(metadata.GlobalColorTable, (Func <GifColor, Color>)(gc => Color.FromArgb(byte.MaxValue, gc.R, gc.G, gc.B))));
}
for (int index = 0; index < metadata.Frames.Count; ++index)
{
GifFrame frame = metadata.Frames[index];
Color[] colors = colorArray;
if (frame.Descriptor.HasLocalColorTable)
{
colors = (Color[])Enumerable.ToArray <Color>(Enumerable.Select <GifColor, Color>(frame.LocalColorTable, (Func <GifColor, Color>)(gc => Color.FromArgb(byte.MaxValue, gc.R, gc.G, gc.B))));
}
int?transparencyIndex = new int?();
GifGraphicControlExtension graphicControl = frame.GraphicControl;
if (graphicControl != null && graphicControl.HasTransparency)
{
transparencyIndex = new int?(graphicControl.TransparencyIndex);
}
dictionary[index] = new Animator.GifPalette(transparencyIndex, colors);
}
return(dictionary);
}
private static WriteableBitmap CreateBitmap(GifDataStream metadata)
{
var desc = metadata.Header.LogicalScreenDescriptor;
var bitmap = new WriteableBitmap(desc.Width, desc.Height, 96, 96, PixelFormats.Bgra32, null);
return(bitmap);
}
private static RepeatBehavior GetRepeatBehavior(GifDataStream metadata)
{
if ((int)metadata.RepeatCount == 0)
{
return(RepeatBehavior.Forever);
}
return(new RepeatBehavior((double)metadata.RepeatCount));
}
internal static async Task<TAnimator> CreateAsyncCore<TAnimator>(
Stream sourceStream,
Func<GifDataStream, TAnimator> create)
where TAnimator : Animator
{
var metadata = await GifDataStream.ReadAsync(sourceStream);
return create(metadata);
}
private static RepeatBehavior GetRepeatBehaviorFromGif(GifDataStream metadata)
{
if (metadata.RepeatCount == 0)
{
return(RepeatBehavior.Forever);
}
return(new RepeatBehavior(metadata.RepeatCount));
}
private static byte[] CreateIndexStreamBuffer(GifDataStream metadata, Stream stream)
{
long val2 = stream.Length - ((GifFrame)Enumerable.Last <GifFrame>(metadata.Frames)).ImageData.CompressedDataStartOffset;
long num = val2;
if (metadata.Frames.Count > 1)
{
num = Math.Max(Enumerable.Max((IEnumerable <long>)Enumerable.Zip <GifFrame, GifFrame, long>((IEnumerable <GifFrame>)metadata.Frames, (IEnumerable <GifFrame>)Enumerable.Skip <GifFrame>((IEnumerable <GifFrame>)metadata.Frames, 1), (Func <GifFrame, GifFrame, long>)((f1, f2) => f2.ImageData.CompressedDataStartOffset - f1.ImageData.CompressedDataStartOffset))), val2);
}
return(new byte[num + 4L]);
}
private TimingManager CreateTimingManager(GifDataStream metadata, RepeatBehavior repeatBehavior)
{
TimingManager timingManager = new TimingManager(repeatBehavior == new RepeatBehavior() ? Animator.GetRepeatBehavior(metadata) : repeatBehavior);
foreach (GifFrame frame in (IEnumerable <GifFrame>)metadata.Frames)
{
timingManager.Add(Animator.GetFrameDelay(frame));
}
timingManager.Completed += new EventHandler(this.TimingManagerCompleted);
return(timingManager);
}
private static WriteableBitmap CreateBitmap(GifDataStream metadata)
{
var desc = metadata.Header.LogicalScreenDescriptor;
#if WPF
var bitmap = new WriteableBitmap(desc.Width, desc.Height, 96, 96, PixelFormats.Bgra32, null);
#elif WINRT
var bitmap = new WriteableBitmap(desc.Width, desc.Height);
#else
#error Not implemented
#endif
return bitmap;
}
internal Animator(Stream sourceStream, Uri sourceUri, GifDataStream metadata, RepeatBehavior repeatBehavior)
{
_sourceStream = sourceStream;
_sourceUri = sourceUri;
_metadata = metadata;
_palettes = CreatePalettes(metadata);
_bitmap = CreateBitmap(metadata);
var desc = metadata.Header.LogicalScreenDescriptor;
_stride = 4 * ((desc.Width * 32 + 31) / 32);
_previousBackBuffer = new byte[desc.Height * _stride];
_indexStreamBuffer = CreateIndexStreamBuffer(metadata, _sourceStream);
_timingManager = CreateTimingManager(metadata, repeatBehavior);
}
private TimingManager CreateTimingManager(GifDataStream metadata, RepeatBehavior repeatBehavior)
{
var actualRepeatBehavior = GetActualRepeatBehavior(metadata, repeatBehavior);
var manager = new TimingManager(actualRepeatBehavior);
foreach (var frame in metadata.Frames)
{
manager.Add(GetFrameDelay(frame));
}
manager.Completed += TimingManagerCompleted;
return(manager);
}
internal static async Task <TAnimator> CreateAsyncCore <TAnimator>(
Stream sourceStream,
Func <GifDataStream, TAnimator> create)
where TAnimator : Animator
{
if (!sourceStream.CanSeek)
{
throw new ArgumentException("The stream is not seekable");
}
sourceStream.Seek(0, SeekOrigin.Begin);
var metadata = await GifDataStream.ReadAsync(sourceStream);
return(create(metadata));
}
private Animator(Stream sourceStream, Uri sourceUri, GifDataStream metadata, RepeatBehavior repeatBehavior, Image image)
{
//this.\u002Ector();
this._sourceStream = sourceStream;
this._sourceUri = sourceUri;
this._metadata = metadata;
this._image = image;
this._palettes = Animator.CreatePalettes(metadata);
this._bitmap = Animator.CreateBitmap(metadata);
GifLogicalScreenDescriptor screenDescriptor = metadata.Header.LogicalScreenDescriptor;
this._stride = 4 * ((screenDescriptor.Width * 32 + 31) / 32);
this._previousBackBuffer = new byte[screenDescriptor.Height * this._stride];
this._indexStreamBuffer = Animator.CreateIndexStreamBuffer(metadata, this._sourceStream);
this._timingManager = this.CreateTimingManager(metadata, repeatBehavior);
}
private static byte[] CreateIndexStreamBuffer(GifDataStream metadata, Stream stream)
{
// Find the size of the largest frame pixel data
// (ignoring the fact that we include the next frame's header)
long lastSize = stream.Length - metadata.Frames.Last().ImageData.CompressedDataStartOffset;
long maxSize = lastSize;
if (metadata.Frames.Count > 1)
{
var sizes = metadata.Frames.Zip(metadata.Frames.Skip(1),
(f1, f2) => f2.ImageData.CompressedDataStartOffset - f1.ImageData.CompressedDataStartOffset);
maxSize = Math.Max(sizes.Max(), lastSize);
}
// Need 4 extra bytes so that BitReader doesn't need to check the size for every read
return new byte[maxSize + 4];
}
private static async Task DecompressAllFramesAsync(string path)
{
using var fileStream = File.OpenRead(path);
var gif = await GifDataStream.ReadAsync(fileStream);
for (int i = 0; i < gif.Frames.Count; i++)
{
var frame = gif.Frames[i];
fileStream.Seek(frame.ImageData.CompressedDataStartOffset, SeekOrigin.Begin);
using var ms = new MemoryStream();
await GifHelpers.CopyDataBlocksToStreamAsync(fileStream, ms);
using var lzwStream = new LzwDecompressStream(ms.GetBuffer(), frame.ImageData.LzwMinimumCodeSize);
using var indOutStream = File.OpenWrite($"{path}.{i}.ind");
await lzwStream.CopyToAsync(indOutStream);
}
}
private static async Task TestLzwDecompressionAsync(string path)
{
using (var fileStream = File.OpenRead(path))
{
var gif = await GifDataStream.ReadAsync(fileStream);
var firstFrame = gif.Frames[0];
fileStream.Seek(firstFrame.ImageData.CompressedDataStartOffset, SeekOrigin.Begin);
using (var ms = new MemoryStream())
{
await GifHelpers.CopyDataBlocksToStreamAsync(fileStream, ms);
using (var lzwStream = new LzwDecompressStream(ms.GetBuffer(), firstFrame.ImageData.LzwMinimumCodeSize))
using (var indOutStream = File.OpenWrite(path + ".ind"))
{
await lzwStream.CopyToAsync(indOutStream);
}
}
}
}
private static Dictionary <int, GifPalette> CreatePalettes(GifDataStream metadata)
{
var palettes = new Dictionary <int, GifPalette>();
Color[] globalColorTable = null;
if (metadata.Header.LogicalScreenDescriptor.HasGlobalColorTable)
{
globalColorTable =
metadata.GlobalColorTable
.Select(gc => Color.FromArgb(0xFF, gc.R, gc.G, gc.B))
.ToArray();
}
for (int i = 0; i < metadata.Frames.Count; i++)
{
var frame = metadata.Frames[i];
var colorTable = globalColorTable;
if (frame.Descriptor.HasLocalColorTable)
{
colorTable =
frame.LocalColorTable
.Select(gc => Color.FromArgb(0xFF, gc.R, gc.G, gc.B))
.ToArray();
}
int?transparencyIndex = null;
var gce = frame.GraphicControl;
if (gce != null && gce.HasTransparency)
{
transparencyIndex = gce.TransparencyIndex;
}
palettes[i] = new GifPalette(transparencyIndex, colorTable);
}
return(palettes);
}
private static RepeatBehavior GetActualRepeatBehavior(GifDataStream metadata, RepeatBehavior repeatBehavior)
{
return(repeatBehavior == default
? GetRepeatBehaviorFromGif(metadata)
: repeatBehavior);
}
private static RepeatBehavior GetRepeatBehavior(GifDataStream metadata)
{
if (metadata.RepeatCount == 0)
return RepeatBehavior.Forever;
return new RepeatBehavior(metadata.RepeatCount);
}
public ImageAnimator(Stream sourceStream, Uri sourceUri, GifDataStream metadata, RepeatBehavior repeatBehavior, Image image) : base(sourceStream, sourceUri, metadata, repeatBehavior)
{
_image = image;
OnRepeatBehaviorChanged(); // in case the value has changed during creation
}
public ImageAnimator(Stream sourceStream, Uri sourceUri, GifDataStream metadata, RepeatBehavior repeatBehavior, Image image) : base(sourceStream, sourceUri, metadata, repeatBehavior)
{
ErrorSource = image;
}
private static WriteableBitmap CreateBitmap(GifDataStream metadata)
{
GifLogicalScreenDescriptor screenDescriptor = metadata.Header.LogicalScreenDescriptor;
return(new WriteableBitmap(screenDescriptor.Width, screenDescriptor.Height));
}