private static MyColor GetColor(int x, int y, int stride, byte[] data)
{
int pos = y * stride + x * 4;
byte a = data[pos + 3];
byte r = data[pos + 2];
byte g = data[pos + 1];
byte b = data[pos + 0];
return MyColor.FromARGB(a, r, g, b);
}
public MyColor GetColor(int x, int y)
{
int pos = y * stride + x * 4;
byte a = data[pos + 3];
byte r = data[pos + 2];
byte g = data[pos + 1];
byte b = data[pos + 0];
return(MyColor.FromARGB(a, r, g, b));
}
public static Point GetSubPositions(Bitmap main, Bitmap sub)
{
List <Point> possiblepos = new List <Point>();
int mainwidth = main.Width;
int mainheight = main.Height;
int subwidth = sub.Width;
int subheight = sub.Height;
int movewidth = mainwidth - subwidth;
int moveheight = mainheight - subheight;
BitmapData bmMainData = main.LockBits(new Rectangle(0, 0, mainwidth, mainheight), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
BitmapData bmSubData = sub.LockBits(new Rectangle(0, 0, subwidth, subheight), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
int bytesMain = Math.Abs(bmMainData.Stride) * mainheight;
int strideMain = bmMainData.Stride;
System.IntPtr Scan0Main = bmMainData.Scan0;
byte[] dataMain = new byte[bytesMain];
System.Runtime.InteropServices.Marshal.Copy(Scan0Main, dataMain, 0, bytesMain);
int bytesSub = Math.Abs(bmSubData.Stride) * subheight;
int strideSub = bmSubData.Stride;
System.IntPtr Scan0Sub = bmSubData.Scan0;
byte[] dataSub = new byte[bytesSub];
System.Runtime.InteropServices.Marshal.Copy(Scan0Sub, dataSub, 0, bytesSub);
var zeroColor = MyColor.FromARGB(0, 0, 0, 0);
for (int y = 0; y < mainheight; ++y)
{
for (int x = 0; x < mainwidth; ++x)
{
MyColor curcolor = GetColor(x, y, strideMain, dataMain);
foreach (var item in possiblepos.ToArray())
{
int xsub = x - item.X;
int ysub = y - item.Y;
if (xsub >= subwidth || ysub >= subheight || xsub < 0)
{
continue;
}
MyColor subcolor = GetColor(xsub, ysub, strideSub, dataSub);
if (!curcolor.Equals(subcolor) && !curcolor.Equals(zeroColor))
{
possiblepos.Remove(item);
}
}
if (x >= movewidth || y >= movewidth)
{
continue;
}
if (curcolor.Equals(GetColor(0, 0, strideSub, dataSub)))
{
possiblepos.Add(new Point(x, y));
}
}
}
System.Runtime.InteropServices.Marshal.Copy(dataSub, 0, Scan0Sub, bytesSub);
sub.UnlockBits(bmSubData);
System.Runtime.InteropServices.Marshal.Copy(dataMain, 0, Scan0Main, bytesMain);
main.UnlockBits(bmMainData);
if (possiblepos.Count == 0)
{
return(null);
}
return(possiblepos[0]);
}
