Merge Bitmap - CSharp System.Drawing

Description

Merge Bitmap
Demo Code

/* Copyright (c) 2006-2008, Peter Golde
 * All rights reserved./*w  ww .  ja v a  2 s.c  om*/
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. Neither the name of Peter Golde, nor "Purple Pen", nor the names
 * of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing;
using System.Diagnostics;
using System;

public class Main{
        // Combine a source bitmap with a destination bitmap by using Min of each RGB component.
      public static void MergeBitmap(Bitmap bmDest, Rectangle rectDest, Bitmap bmSrc, Rectangle rectSrc) {
         Debug.Assert(rectDest.Width == rectSrc.Width && rectDest.Height == rectSrc.Height);

         BitmapData bmDataSrc = bmSrc.LockBits(rectSrc, ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
         BitmapData bmDataDest = bmDest.LockBits(rectDest, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

         unsafe {
            byte * pixelSrc = ((byte *)bmDataSrc.Scan0);
            byte * pixelDest = ((byte *)bmDataDest.Scan0);

            for (int i = 0; i < rectSrc.Height; ++i) {
               CombineBits(pixelDest, pixelSrc, 3 * rectSrc.Width);

               pixelSrc += bmDataSrc.Stride;
               pixelDest += bmDataDest.Stride;
            }
         }

         bmSrc.UnlockBits(bmDataSrc);
         bmDest.UnlockBits(bmDataDest);
      }
        // Combine bits from src into dest, setting each byte to the minimum of the source and dest byes.
      // size is the length in bytes.
      unsafe static void CombineBits(byte * dest, byte * src, int size) {
         // Unrolled loop for better speed.
         while (size >= 8) {
            byte srcbyte, destbyte;

            srcbyte = src[0]; destbyte = dest[0];  if (srcbyte < destbyte) dest[0] = srcbyte;
            srcbyte = src[1]; destbyte = dest[1];  if (srcbyte < destbyte) dest[1] = srcbyte;
            srcbyte = src[2]; destbyte = dest[2];  if (srcbyte < destbyte) dest[2] = srcbyte;
            srcbyte = src[3]; destbyte = dest[3];  if (srcbyte < destbyte) dest[3] = srcbyte;
            srcbyte = src[4]; destbyte = dest[4];  if (srcbyte < destbyte) dest[4] = srcbyte;
            srcbyte = src[5]; destbyte = dest[5];  if (srcbyte < destbyte) dest[5] = srcbyte;
            srcbyte = src[6]; destbyte = dest[6];  if (srcbyte < destbyte) dest[6] = srcbyte;
            srcbyte = src[7]; destbyte = dest[7];  if (srcbyte < destbyte) dest[7] = srcbyte;

            src += 8;
            dest += 8;
            size -= 8;
         }

         while (size > 0) {
            byte srcbyte = *src++, destbyte = *dest;
            if (srcbyte < destbyte)
               *dest = srcbyte;
            ++dest;
            --size;
         }
      }
}
Merge Bitmap - CSharp System.Drawing

Description

Demo Code

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