private protected override Bitmap Process(Bitmap bmp, Rectangle region)
{
if (bmp.PixelFormat != PixelFormat.Format32bppArgb)
{
bmp = bmp.ToARGB32();
}
Bitmap result = new(bmp.Width, bmp.Height, PixelFormat.Format32bppArgb);
BitmapLocker src = bmp;
BitmapLocker dst = result;
src.LockRGBAPixels((ps, ws, hs) => dst.LockRGBAPixels((pd, wd, hd) =>
{
Process(bmp, ps, pd, region);
Parallel.For(0, ws * hs, i =>
{
if (!region.Contains(i % ws, i / ws))
{
pd[i] = ps[i];
}
});
}));
return(result);
}
internal protected override unsafe void Process(Bitmap bmp, RGBAColor *p_top, RGBAColor *p_dest, Rectangle region)
{
if (bmp.Size != BaseLayer.Size)
{
throw new ArgumentException($"The top layer ('{nameof(bmp)}') must have the same dimensions as the base layer. The required dimensions are: {BaseLayer.Width}x{BaseLayer.Height}.", nameof(bmp));
}
int[] indices = GetIndices(BaseLayer, region);
BitmapLocker lck = BaseLayer;
BlendMode mode = Mode;
lck.LockRGBAPixels((p_base, w, h) => Parallel.For(0, indices.Length, i =>
{
int idx = indices[i];
p_dest[idx] = RGBAColor.Blend(p_base[idx], p_top[idx], mode);
}));
}