public void TestPackedValue()
{
Assert.Equal(0, GifGraphicControlExtension.GetPackedValue(GifDisposalMethod.Unspecified, false, false));
Assert.Equal(11, GifGraphicControlExtension.GetPackedValue(GifDisposalMethod.RestoreToBackground, true, true));
Assert.Equal(4, GifGraphicControlExtension.GetPackedValue(GifDisposalMethod.NotDispose, false, false));
Assert.Equal(14, GifGraphicControlExtension.GetPackedValue(GifDisposalMethod.RestoreToPrevious, true, false));
}
private static ImageBehavior.FrameMetadata GetFrameMetadata(GifFrame gifMetadata)
{
GifImageDescriptor descriptor = gifMetadata.Descriptor;
ImageBehavior.FrameMetadata frameMetadata = new ImageBehavior.FrameMetadata()
{
Left = descriptor.Left,
Top = descriptor.Top,
Width = descriptor.Width,
Height = descriptor.Height,
Delay = TimeSpan.FromMilliseconds(100.0),
DisposalMethod = ImageBehavior.FrameDisposalMethod.None
};
GifGraphicControlExtension controlExtension = gifMetadata.Extensions.OfType <GifGraphicControlExtension>().FirstOrDefault <GifGraphicControlExtension>();
if (controlExtension != null)
{
if (controlExtension.Delay != 0)
{
frameMetadata.Delay = TimeSpan.FromMilliseconds((double)controlExtension.Delay);
}
frameMetadata.DisposalMethod = (ImageBehavior.FrameDisposalMethod)controlExtension.DisposalMethod;
}
return(frameMetadata);
}
public static GifExtension ReadExtension(Stream stream, IEnumerable <GifExtension> controlExtensions, bool metadataOnly)
{
//Note: at this point, the Extension Introducer (0x21) has already been read
var label = stream.ReadByte();
if (label < 0)
{
throw GifHelpers.UnexpectedEndOfStreamException();
}
switch (label)
{
case GifGraphicControlExtension.ExtensionLabel:
return(GifGraphicControlExtension.ReadGraphicsControl(stream));
case GifCommentExtension.ExtensionLabel:
return(GifCommentExtension.ReadComment(stream));
case GifPlainTextExtension.ExtensionLabel:
return(GifPlainTextExtension.ReadPlainText(stream, controlExtensions, metadataOnly));
case GifApplicationExtension.ExtensionLabel:
return(GifApplicationExtension.ReadApplication(stream));
default:
throw GifHelpers.UnknownExtensionTypeException(label);
}
}
private void DisposePreviousFrame(GifFrame currentFrame)
{
GifFrame previousFrame = this._previousFrame;
GifGraphicControlExtension controlExtension = previousFrame != null ? previousFrame.GraphicControl : null;
if (controlExtension != null)
{
switch (controlExtension.DisposalMethod)
{
case GifFrameDisposalMethod.RestoreBackground:
this.ClearArea((IGifRect)this._previousFrame.Descriptor);
break;
case GifFrameDisposalMethod.RestorePrevious:
Animator.CopyToBitmap(this._previousBackBuffer, this._bitmap, 0, this._previousBackBuffer.Length);
break;
}
}
GifGraphicControlExtension graphicControl = currentFrame.GraphicControl;
if (graphicControl == null || graphicControl.DisposalMethod != GifFrameDisposalMethod.RestorePrevious)
{
return;
}
Animator.CopyFromBitmap(this._previousBackBuffer, this._bitmap, 0, this._previousBackBuffer.Length);
}
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);
}
public static GifGraphicControlExtension ReadGraphicsControl(Stream stream)
{
var ext = new GifGraphicControlExtension();
ext.Read(stream);
return(ext);
}
private static TimeSpan GetFrameDelay(GifFrame frame)
{
GifGraphicControlExtension graphicControl = frame.GraphicControl;
if (graphicControl != null && graphicControl.Delay != 0)
{
return(TimeSpan.FromMilliseconds((double)graphicControl.Delay));
}
return(TimeSpan.FromMilliseconds(100.0));
}
