[jgardou] 51014: [GDI32] - allocate sufficient buffer when creating a DIBSECTION compatible bitmap. Fixes bug 5822

Author: jgardou
Date: Fri Mar 11 10:33:03 2011
New Revision: 51014

URL: http://svn.reactos.org/svn/reactos?rev=51014&view=rev
Log:
[GDI32]
   - allocate sufficient buffer when creating a DIBSECTION compatible bitmap.
Fixes bug 5822

Modified:
    trunk/reactos/dll/win32/gdi32/objects/bitmap.c

Modified: trunk/reactos/dll/win32/gdi32/objects/bitmap.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/gdi32/objects/bit...
==============================================================================
--- trunk/reactos/dll/win32/gdi32/objects/bitmap.c [iso-8859-1] (original)
+++ trunk/reactos/dll/win32/gdi32/objects/bitmap.c [iso-8859-1] Fri Mar 11 10:33:03 2011
@@ -348,8 +348,6 @@
     INT  Height)
 {
     PDC_ATTR pDc_Attr;
-    HBITMAP hBmp = NULL;
-    DIBSECTION dibs;

if (!GdiGetHandleUserData(hDC, GDI_OBJECT_TYPE_DC, (PVOID)&pDc_Attr))
         return NULL;
@@ -361,19 +359,26 @@
     {
         return  NtGdiCreateCompatibleBitmap(hDC, Width, Height);
     }
-
-    hBmp = NtGdiGetDCObject(hDC, GDI_OBJECT_TYPE_BITMAP);
-
-    if ( GetObjectA(hBmp, sizeof(DIBSECTION), &dibs) != sizeof(DIBSECTION) )
-        return NULL;
-
-    if ( dibs.dsBm.bmBitsPixel <= 8 )
-        GetDIBColorTable(hDC, 0, 256, (RGBQUAD *)&dibs.dsBitfields);
-
-    dibs.dsBmih.biWidth = Width;
-    dibs.dsBmih.biHeight = Height;
-
-    return CreateDIBSection(hDC, (CONST BITMAPINFO *)&dibs.dsBmih, 0, NULL, NULL, 0);
+    else
+    {
+        HBITMAP hBmp = NULL;
+        char buffer[sizeof(DIBSECTION) + 256*sizeof(RGBQUAD)];
+        DIBSECTION* pDIBs = (DIBSECTION*)buffer;
+
+        hBmp = NtGdiGetDCObject(hDC, GDI_OBJECT_TYPE_BITMAP);
+
+        if ( GetObjectA(hBmp, sizeof(DIBSECTION), pDIBs) != sizeof(DIBSECTION) )
+            return NULL;
+
+        if ( pDIBs->dsBm.bmBitsPixel <= 8 )
+            GetDIBColorTable(hDC, 0, 256, (RGBQUAD *)&pDIBs->dsBitfields[0]);
+
+        pDIBs->dsBmih.biWidth = Width;
+        pDIBs->dsBmih.biHeight = Height;
+
+        return CreateDIBSection(hDC, (CONST BITMAPINFO *)&pDIBs->dsBmih, 0, NULL, NULL, 0);
+    }
+    return NULL;
 }