private void createImage(uint[] colorIndexes, ImageDescriptor imageDescriptor, ColorTable localColorTable)
{
uint localX = imageDescriptor.X;
uint localY = imageDescriptor.Y;
uint localW = imageDescriptor.Width;
uint localH = imageDescriptor.Height;
//Every pixel consists of 4 bytes: R, G, B, A values
byte[] data = new byte[localW * localH * 4];
int transparentColorIndex = -1;
int delay = 0;
FrameDisposalMethod disposalMethod = FrameDisposalMethod.Clear;
if (_extensions.Count > 0 && _extensions.Last() is GraphicsControlExtension)
{
GraphicsControlExtension gce = _extensions.Last() as GraphicsControlExtension;
delay = gce.Delay;
if (gce.HasTransparency)
{
transparentColorIndex = gce.TransparentColorIndex;
}
disposalMethod = gce.DisposalMethod;
}
for (int i = 0; i < data.Length; i += 4)
{
Color color = localColorTable[(int)colorIndexes[i / 4]];
data[i + 0] = color.R;
data[i + 1] = color.G;
data[i + 2] = color.B;
if (colorIndexes[i / 4] == transparentColorIndex)
{
data[i + 3] = 0;
}
else
{
data[i + 3] = byte.MaxValue;
}
}
if (imageDescriptor.Interlaced)
{
data = interlace(data, localW, localH);
}
_images.Add(new GifImage(data, localX, localY, localW, localH, delay, disposalMethod));
}
private static ObjectAnimationUsingKeyFrames GetAnimation(Image imageControl, BitmapSource source)
{
ObjectAnimationUsingKeyFrames animation = AnimationCache.GetAnimation(source, GetRepeatBehavior(imageControl));
if (animation == null)
{
GifFile file;
GifBitmapDecoder decoder = GetDecoder(source, out file) as GifBitmapDecoder;
if ((decoder == null) || (decoder.Frames.Count <= 1))
{
return(null);
}
Int32Size fullSize = GetFullSize(decoder, file);
int frameIndex = 0;
animation = new ObjectAnimationUsingKeyFrames();
TimeSpan zero = TimeSpan.Zero;
BitmapSource baseFrame = null;
foreach (BitmapFrame frame in decoder.Frames)
{
FrameMetadata metadata = GetFrameMetadata(decoder, file, frameIndex);
BitmapSource source3 = MakeFrame(fullSize, frame, metadata, baseFrame);
DiscreteObjectKeyFrame keyFrame = new DiscreteObjectKeyFrame(source3, zero);
animation.KeyFrames.Add(keyFrame);
zero += metadata.Delay;
FrameDisposalMethod disposalMethod = metadata.DisposalMethod;
switch (disposalMethod)
{
case FrameDisposalMethod.None:
case FrameDisposalMethod.DoNotDispose:
baseFrame = source3;
break;
case FrameDisposalMethod.RestoreBackground:
baseFrame = !IsFullFrame(metadata, fullSize) ? ClearArea(source3, metadata) : null;
break;
default:
break;
}
frameIndex++;
}
animation.Duration = zero;
animation.RepeatBehavior = GetActualRepeatBehavior(imageControl, decoder, file);
AnimationCache.AddAnimation(source, GetRepeatBehavior(imageControl), animation);
AnimationCache.IncrementReferenceCount(source, GetRepeatBehavior(imageControl));
}
return(animation);
}
public GifImage(byte[] data, uint x, uint y, uint width, uint height, int delay, FrameDisposalMethod disposalMethod)
{
Data = data;
Width = width;
Height = height;
X = x;
Y = y;
Delay = (uint)delay;
}
