public static void Compose(PorterDuffCompositingMode mode, Bitmap source, Bitmap destination)
{
var minWidth = Math.Min(source.Width, destination.Width);
var minHeight = Math.Min(source.Height, destination.Height);
#if false
for (int y = 0; y < minHeight; ++y)
{
for (int x = 0; x < minWidth; ++x)
{
var tmp = mode.ComposePixel(source.GetPixel(x, y), destination.GetPixel(x, y));
destination.SetPixel(x, y, tmp);
}
}
#else
var rect = new Rectangle(0, 0, minWidth, minHeight);
using (var sourceData = PixelData.LockBits(source, rect, ImageLockMode.ReadOnly))
using (var destinationData = PixelData.LockBits(destination, rect, ImageLockMode.ReadWrite))
{
for (int y = 0; y < minHeight; ++y)
{
var destYOffset = y * destinationData.Stride;
var destXOffset = y * sourceData.Stride;
for (int x = 0; x < minWidth; ++x)
{
int destIndex = destYOffset + x;
int srcIndex = destXOffset + x;
Color destColor = Color.FromArgb(destinationData.Bytes[destIndex]);
Color srcColor = Color.FromArgb(sourceData.Bytes[srcIndex]);
destinationData.Bytes[destIndex] = mode.ComposePixel(srcColor, destColor).ToArgb();
}
}
destinationData.Commit();
}
#endif
}
public CompositingModeComboBoxItem(string name, PorterDuffCompositingMode mode)
{
this.Name = name;
this.Mode = mode;
}