void LoadFrame()
{
if (CurrentFrameIndex >= FrameCount)
{
return;
}
stream.Seek(frameOffsets[CurrentFrameIndex], SeekOrigin.Begin);
var dataLength = frameOffsets[CurrentFrameIndex + 1] - frameOffsets[CurrentFrameIndex];
var rawData = StreamExts.ReadBytes(stream, (int)dataLength);
var intermediateData = new byte[Width * Height];
// Format80 decompression
LCWCompression.DecodeInto(rawData, intermediateData);
// and Format40 decompression
currentFramePaletteIndexData = new byte[Width * Height];
if (previousFramePaletteIndexData == null)
{
Array.Clear(currentFramePaletteIndexData, 0, currentFramePaletteIndexData.Length);
}
else
{
Array.Copy(previousFramePaletteIndexData, currentFramePaletteIndexData, currentFramePaletteIndexData.Length);
}
XORDeltaCompression.DecodeInto(intermediateData, currentFramePaletteIndexData, 0);
var c = 0;
var position = 0;
for (var y = 0; y < Height; y++)
{
for (var x = 0; x < Width; x++)
{
var colorIndex = currentFramePaletteIndexData[c++];
CurrentFrameData[position++] = paletteBytes[colorIndex * 4];
CurrentFrameData[position++] = paletteBytes[colorIndex * 4 + 1];
CurrentFrameData[position++] = paletteBytes[colorIndex * 4 + 2];
CurrentFrameData[position++] = paletteBytes[colorIndex * 4 + 3];
}
// Recalculate the position in the byte array to the start of the next pixel row just in case there is padding in the frame.
position = (y + 1) * totalFrameWidth * 4;
}
}
void LoadFrame()
{
if (currentFrame >= frameCount)
{
return;
}
stream.Seek(frameOffsets[currentFrame], SeekOrigin.Begin);
var dataLength = frameOffsets[currentFrame + 1] - frameOffsets[currentFrame];
var rawData = StreamExts.ReadBytes(stream, (int)dataLength);
var intermediateData = new byte[width * height];
// Format80 decompression
LCWCompression.DecodeInto(rawData, intermediateData);
// and Format40 decompression
currentFrameData = new byte[width * height];
if (previousFrameData == null)
{
Array.Clear(currentFrameData, 0, currentFrameData.Length);
}
else
{
Array.Copy(previousFrameData, currentFrameData, currentFrameData.Length);
}
XORDeltaCompression.DecodeInto(intermediateData, currentFrameData, 0);
var c = 0;
var frameSize = Exts.NextPowerOf2(Math.Max(width, height));
coloredFrameData = new uint[frameSize, frameSize];
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
coloredFrameData[y, x] = palette[currentFrameData[c++]];
}
}
}
