gdiplus: Use one GetDIBits call instead of one per row.

dlls/gdiplus/image.c

@@ -4645,7 +4645,6 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromHBITMAP(HBITMAP hbm, HPALETTE hpal, GpBi
     GpStatus retval;
     PixelFormat format;
     BitmapData lockeddata;
-    INT y;
 
     TRACE("%p %p %p\n", hbm, hpal, bitmap);
 
@@ -4695,14 +4694,10 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromHBITMAP(HBITMAP hbm, HPALETTE hpal, GpBi
         if (retval == Ok)
         {
             HDC hdc;
-            HBITMAP oldhbm;
             BITMAPINFO *pbmi;
-            INT src_height, dst_stride;
-            BYTE *dst_bits;
+            INT src_height;
 
             hdc = CreateCompatibleDC(NULL);
-            oldhbm = SelectObject(hdc, hbm);
-
             pbmi = GdipAlloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 
             if (pbmi)
@@ -4713,30 +4708,15 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromHBITMAP(HBITMAP hbm, HPALETTE hpal, GpBi
                 GetDIBits(hdc, hbm, 0, 0, NULL, pbmi, DIB_RGB_COLORS);
 
                 src_height = abs(pbmi->bmiHeader.biHeight);
+                pbmi->bmiHeader.biHeight = -src_height;
 
-                if (pbmi->bmiHeader.biHeight > 0)
-                {
-                    dst_bits = (BYTE*)lockeddata.Scan0+lockeddata.Stride*(src_height-1);
-                    dst_stride = -lockeddata.Stride;
-                }
-                else
-                {
-                    dst_bits = lockeddata.Scan0;
-                    dst_stride = lockeddata.Stride;
-                }
-
-                for (y=0; y<src_height; y++)
-                {
-                    GetDIBits(hdc, hbm, y, 1, dst_bits+dst_stride*y,
-                        pbmi, DIB_RGB_COLORS);
-                }
+                GetDIBits(hdc, hbm, 0, src_height, lockeddata.Scan0, pbmi, DIB_RGB_COLORS);
 
                 GdipFree(pbmi);
             }
             else
                 retval = OutOfMemory;
 
-            SelectObject(hdc, oldhbm);
             DeleteDC(hdc);
 
             GdipBitmapUnlockBits(*bitmap, &lockeddata);