[ros-diffs] [fireball] 45502: - Add back DIB section's "bottom down" property, which fixes existing issues (and adds new one in Explorer's start menu). Issue #28 in the Arwinss wiki. - Remove unnecessary abs'es of always positive values. - Add ScanLines/ScanStart bounds checking. - Actually return a real amount of copied scanlines instead of always faking success.

Author: fireball
Date: Mon Feb  8 22:42:12 2010
New Revision: 45502

URL: http://svn.reactos.org/svn/reactos?rev=45502&view=rev
Log:
- Add back DIB section's "bottom down" property, which fixes existing issues (and adds new one in Explorer's start menu). Issue #28 in the Arwinss wiki.
- Remove unnecessary abs'es of always positive values.
- Add ScanLines/ScanStart bounds checking.
- Actually return a real amount of copied scanlines instead of always faking success.

Modified:
    branches/arwinss/reactos/subsystems/win32/win32k/gdi/bitmap.c
    branches/arwinss/reactos/subsystems/win32/win32k/gre/bitblt.c

Modified: branches/arwinss/reactos/subsystems/win32/win32k/gdi/bitmap.c
URL: http://svn.reactos.org/svn/reactos/branches/arwinss/reactos/subsystems/win32...
==============================================================================
--- branches/arwinss/reactos/subsystems/win32/win32k/gdi/bitmap.c [iso-8859-1] (original)
+++ branches/arwinss/reactos/subsystems/win32/win32k/gdi/bitmap.c [iso-8859-1] Mon Feb  8 22:42:12 2010
@@ -136,7 +136,7 @@

/* Get DIB section size */
     szSize.cx = dib->dsBm.bmWidth;
-    szSize.cy = abs(dib->dsBm.bmHeight);
+    szSize.cy = dib->dsBm.bmHeight;

/* Get its format */
     ulFormat = GrepBitmapFormat(dib->dsBmih.biBitCount * dib->dsBmih.biPlanes,
@@ -146,7 +146,7 @@
     hbmDIB = GreCreateBitmap(szSize,
                              dib->dsBm.bmWidthBytes, ulFormat,
                              BMF_DONTCACHE | BMF_USERMEM | BMF_NOZEROINIT |
-                             0,
+                             (dib->dsBmih.biHeight < 0 ? BMF_TOPDOWN : 0),
                              dib->dsBm.bmBits);

dib->dsBmih.biClrUsed = 0;
@@ -371,13 +371,13 @@
         hBitmap, hUserBitmap, StartScan, ScanLines);

/* Set the bits */
-    GreSetDIBits(pDC,
-                 hBitmap,
-                 StartScan,
-                 ScanLines,
-                 Bits,
-                 bmi,
-                 ColorUse);
+    ScanLines = GreSetDIBits(pDC,
+                             hBitmap,
+                             StartScan,
+                             ScanLines,
+                             Bits,
+                             bmi,
+                             ColorUse);

/* Release DC objects */
     DC_Unlock(pDC);

Modified: branches/arwinss/reactos/subsystems/win32/win32k/gre/bitblt.c
URL: http://svn.reactos.org/svn/reactos/branches/arwinss/reactos/subsystems/win32...
==============================================================================
--- branches/arwinss/reactos/subsystems/win32/win32k/gre/bitblt.c [iso-8859-1] (original)
+++ branches/arwinss/reactos/subsystems/win32/win32k/gre/bitblt.c [iso-8859-1] Mon Feb  8 22:42:12 2010
@@ -594,6 +594,12 @@
     {
         return 0;
     }
+
+    if (!ScanLines || (StartScan >= bitmap->SurfObj.sizlBitmap.cy))
+        return 0;
+
+    if (StartScan + ScanLines > bitmap->SurfObj.sizlBitmap.cy)
+        ScanLines = bitmap->SurfObj.sizlBitmap.cy - StartScan;

// Get RGB values
     if (ColorUse == DIB_PAL_COLORS)