static void ClearBitmap(BitmapCanvas img)
{
Color c = Color.FromArgb(0);
for (int y = 0; y < img.Height; y++)
{
for (int x = 0; x < img.Width; x++)
{
img.SetPixel(x, y, c);
}
}
}
static void JoinBitmaps(BitmapCanvas bottom, BitmapCanvas top, BitmapCanvas dest)
{
int w = Min(bottom.Width, top.Width, dest.Width);
int h = Min(bottom.Height, top.Height, dest.Height);
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
Color bc = bottom.GetPixel(x, y);
Color tc = top.GetPixel(x, y);
Color fin = tc.ToArgb() == 0 ? bc : tc;
dest.SetPixel(x, y, fin);
}
}
}