[khornicek] 50935: [WIN32K] Fix calculating of ScanLines and source point in NtGdiGetDIBitsInternal for top-down bitmaps to more closely mimic win xp behavior. (Timo - high five for your test app) ...

Author: khornicek
Date: Mon Feb 28 12:47:01 2011
New Revision: 50935

URL: http://svn.reactos.org/svn/reactos?rev=50935&view=rev
Log:
[WIN32K]
Fix calculating of ScanLines and source point in NtGdiGetDIBitsInternal for top-down
bitmaps to more closely mimic win xp behavior. (Timo - high five for your test app)
See issue #5524 for more details.

Modified:
    trunk/reactos/subsystems/win32/win32k/objects/dibobj.c

Modified: trunk/reactos/subsystems/win32/win32k/objects/dibobj.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/dibobj.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/dibobj.c [iso-8859-1] Mon Feb 28
12:47:01 2011
@@ -939,9 +939,26 @@
 		rcDest.bottom = ScanLines;
 		rcDest.right = psurf->SurfObj.sizlBitmap.cx;
 
-		srcPoint.x = 0;
-		srcPoint.y = height < 0 ?
-			psurf->SurfObj.sizlBitmap.cy - (StartScan + ScanLines) : StartScan;
+        srcPoint.x = 0;
+
+        if(height < 0)
+        {
+            srcPoint.y = 0;
+
+            if(ScanLines <= StartScan)
+            {
+                ScanLines = 1;
+                SURFACE_ShareUnlockSurface(psurfDest);
+                GreDeleteObject(hBmpDest);
+                goto done;
+            }
+
+            ScanLines -= StartScan;
+        }
+        else
+        {
+            srcPoint.y = StartScan;
+        }
 
 		EXLATEOBJ_vInitialize(&exlo, psurf->ppal, psurfDest->ppal, 0xffffff,
0xffffff, 0);