private static unsafe void ProcessStart(Bitmap bitmap, byte[] buffer, int offset, int count)
{
var imageBoundaries = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
var imageData = bitmap.LockBits(imageBoundaries, ImageLockMode.WriteOnly, bitmap.PixelFormat);
var reader = new QuickBinaryReader(buffer);
var pointer = (byte*) imageData.Scan0;
var width = reader.ReadUnsignedVariableLength();
var height = reader.ReadUnsignedVariableLength();
while (reader.Position < count)
{
var bg = reader.ReadByte();
var gr = reader.ReadByte();
pointer[0] = (byte)(bg & 248);
pointer[1] = (byte)((bg & 7) << 5 | (gr & 7) << 2);
pointer[2] = (byte)(gr & 248);
pointer += 4;
}
bitmap.UnlockBits(imageData);
}
private static unsafe void ProcessDelta(Bitmap bitmap, byte[] buffer, int offset, int count)
{
var imageBoundaries = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
var imageData = bitmap.LockBits(imageBoundaries, ImageLockMode.WriteOnly, bitmap.PixelFormat);
var reader = new QuickBinaryReader(buffer);
var imagePointer = (byte*)imageData.Scan0;
// Moved Regions
var movedRegions = reader.ReadUnsignedVariableLength();
if (movedRegions != 0)
{
var tempBuffer = new byte[bitmap.Width * bitmap.Height * 4];
fixed (byte* tempBufferPointer = &tempBuffer[0])
{
for (var n = 0; n < movedRegions; n++)
{
var fromX = reader.ReadUnsignedVariableLength();
var fromY = reader.ReadUnsignedVariableLength();
var toX = reader.ReadUnsignedVariableLength();
var toY = reader.ReadUnsignedVariableLength();
var width = reader.ReadUnsignedVariableLength();
var height = reader.ReadUnsignedVariableLength();
var region = new MovedRegion
{ FromX = fromX, FromY = fromY, Height = height, ToX = toX, ToY = toY, Width = width };
CopyRegion(imagePointer, tempBufferPointer, bitmap.Width, region);
CopyRegion(tempBufferPointer, imagePointer, bitmap.Width, region);
}
}
}
// Modified Regions
var s = 0;
while (reader.Position < count)
{
var i = reader.ReadSignedVariableLength();
var pointer = imagePointer + s + i;
var bg = reader.ReadByte();
var gr = reader.ReadByte();
pointer[0] = (byte)(bg & 248);
pointer[1] = (byte)((bg & 7) << 5 | (gr & 7) << 2);
pointer[2] = (byte)(gr & 248);
s += i;
}
bitmap.UnlockBits(imageData);
}