[Mono-bugs] [Bug 80681][Nor] Changed - After a bitmap is locked for ReadWrite the image is damaged using the PixelFormat Format24bppRgb.

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Changed by bernd.amend at googlemail.com.

http://bugzilla.ximian.com/show_bug.cgi?id=80681

--- shadow/80681	2007-01-31 12:44:44.000000000 -0500
+++ shadow/80681.tmp.18083	2007-01-31 14:27:42.000000000 -0500
@@ -123,6 +123,42 @@
    } 
 }
 
 ------- Additional Comments From sebastien at ximian.com  2007-01-31 12:44 -------
 For your first sample the problem occurs when unlocking. Commenting
 the UnlockBits produce a correct output bitmap.
+
+------- Additional Comments From bernd.amend at googlemail.com  2007-01-31 14:27 -------
+Are you sure? If I doesn't unlock the bitmap, the bitmap is saved at
+the previous state.
+
+using System.Drawing;
+using System.Drawing.Imaging;
+class MainClass
+{
+        public static void Main(string[] args)
+        {
+                Bitmap bitmap = new Bitmap("image.jpg");
+                BitmapData bmData = bitmap.LockBits(new
+Rectangle(0,0,bitmap.Width,bitmap.Height),
+ImageLockMode.ReadWrite,PixelFormat.Format24bppRgb);
+		bitmap.Save("image1.png",ImageFormat.Png); // image is ok
+      unsafe { 
+         byte *imgPtr = (byte*)(bmData.Scan0); 
+         for( int i = 0 ; i < bmData.Height ; i ++ ) { 
+                    for( int j = 0 ;  j < bmData.Width ;  j ++ ) { 
+                        imgPtr[0] =   0;
+                        imgPtr[1] = 255; 
+                        imgPtr[2] = 255; 
+                        
+                        imgPtr += 3; 
+                    } 
+                    imgPtr += bmData.Stride - bmData.Width * 3; 
+                } 
+      } 
+	bitmap.Save("image2.png",ImageFormat.Png);// image is ok, but it's
+the pre-locked image
+                bitmap.UnlockBits(bmData);
+                bitmap.Save("image3.png",ImageFormat.Png); // image is
+ok and yellow
+        }
+}