private static void ProcessingThread(byte[] gifData, AnimationInfo animationInfo)
{
System.Drawing.Image gifImage = System.Drawing.Image.FromStream(new MemoryStream(gifData));
FrameDimension dimension = new FrameDimension(gifImage.FrameDimensionsList[0]);
int frameCount = gifImage.GetFrameCount(dimension);
animationInfo.frameCount = frameCount;
animationInfo.initialized = true;
int index = 0;
int firstDelayValue = -1;
for (int i = 0; i < frameCount; i++)
{
gifImage.SelectActiveFrame(dimension, i);
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(gifImage.Width, gifImage.Height);
System.Drawing.Graphics.FromImage(bitmap).DrawImage(gifImage, System.Drawing.Point.Empty);
LockBitmap frame = new LockBitmap(bitmap);
frame.LockBits();
FrameInfo currentFrame = new FrameInfo(bitmap.Width, bitmap.Height);
if (currentFrame.colors == null)
{
currentFrame.colors = new Color32[frame.Height * frame.Width];
}
for (int x = 0; x < frame.Width; x++)
{
for (int y = 0; y < frame.Height; y++)
{
System.Drawing.Color sourceColor = frame.GetPixel(x, y);
currentFrame.colors[(frame.Height - y - 1) * frame.Width + x] = new Color32(sourceColor.R, sourceColor.G, sourceColor.B, sourceColor.A);
}
}
int delayPropertyValue = BitConverter.ToInt32(gifImage.GetPropertyItem(20736).Value, index);
if (firstDelayValue == -1)
{
firstDelayValue = delayPropertyValue;
}
currentFrame.delay = delayPropertyValue * 10;
animationInfo.frames.Add(currentFrame);
index += 4;
Thread.Sleep(0);
}
}
private static void ProcessingThread(byte[] apngData, AnimationInfo animationInfo)
{
APNG.APNG apng = APNG.APNG.FromStream(new System.IO.MemoryStream(apngData));
int frameCount = apng.FrameCount;
animationInfo.frameCount = frameCount;
animationInfo.initialized = true;
for (int i = 0; i < frameCount; i++)
{
Frame frame = apng.Frames[i];
System.Drawing.Bitmap bitmap = frame.ToBitmap();
LockBitmap lockBitmap = new LockBitmap(bitmap);
lockBitmap.LockBits();
FrameInfo frameInfo = new FrameInfo(bitmap.Width, bitmap.Height);
for (int x = 0; x < frameInfo.width; x++)
{
for (int y = 0; y < frameInfo.height; y++)
{
System.Drawing.Color sourceColor = lockBitmap.GetPixel(x, y);
Color32 lastFrame = new Color32();
if (i > 0)
{
lastFrame = animationInfo.frames.Last().colors[(frameInfo.height - y - 1) * frameInfo.width + x];
}
if (frame.fcTLChunk.BlendOp == APNG.Chunks.BlendOps.APNGBlendOpSource)
{
frameInfo.colors[(frameInfo.height - y - 1) * frameInfo.width + x] = new Color32(sourceColor.R, sourceColor.G, sourceColor.B, sourceColor.A);
}
if (frame.fcTLChunk.BlendOp == APNG.Chunks.BlendOps.APNGBlendOpOver)
{
float blendedA = ((sourceColor.A / 255f + (1 - (sourceColor.A / 255f)) * (lastFrame.a / 255f)));
float blendedR = ((sourceColor.A / 255f) * (sourceColor.R / 255f) + (1 - (sourceColor.A / 255f)) * (lastFrame.a / 255f) * (lastFrame.r / 255f)) / blendedA;
float blendedG = ((sourceColor.A / 255f) * (sourceColor.G / 255f) + (1 - (sourceColor.A / 255f)) * (lastFrame.a / 255f) * (lastFrame.g / 255f)) / blendedA;
float blendedB = ((sourceColor.A / 255f) * (sourceColor.B / 255f) + (1 - (sourceColor.A / 255f)) * (lastFrame.a / 255f) * (lastFrame.b / 255f)) / blendedA;
frameInfo.colors[(frameInfo.height - y - 1) * frameInfo.width + x] = new Color32((byte)(blendedR * 255), (byte)(blendedG * 255), (byte)(blendedB * 255), (byte)(blendedA * 255));
}
}
}
frameInfo.delay = frame.FrameRate;
animationInfo.frames.Add(frameInfo);
}
}
