[fireball] 45808: - GreSetDIBits: Don't leak a surface lock in case parameters check fails. - GreSetDIBits: Add a (now commented out) optimisation for directly copying bits if source and target bitmaps parameters closely match. Based on a similar winex11.drv optimisation in this function.

Author: fireball
Date: Wed Mar  3 22:50:51 2010
New Revision: 45808

URL: http://svn.reactos.org/svn/reactos?rev=45808&view=rev
Log:
- GreSetDIBits: Don't leak a surface lock in case parameters check fails.
- GreSetDIBits: Add a (now commented out) optimisation for directly copying bits if source and target bitmaps parameters closely match. Based on a similar winex11.drv optimisation in this function.

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

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] Wed Mar  3 22:50:51 2010
@@ -596,7 +596,10 @@
     }

if (!ScanLines || (StartScan >= bitmap->SurfObj.sizlBitmap.cy))
+    {
+        SURFACE_Unlock(bitmap);
         return 0;
+    }

if (StartScan + ScanLines > bitmap->SurfObj.sizlBitmap.cy)
         ScanLines = bitmap->SurfObj.sizlBitmap.cy - StartScan;
@@ -706,6 +709,41 @@
     PALETTE_FreePaletteByHandle(DIB_Palette);
     EngUnlockSurface(SourceSurf);
     EngDeleteSurface((HSURF)SourceBitmap);
+
+#if 0
+  /* optimisation for the case where the input bits are in exactly the same
+   * format as the internal representation and copying to the app bits is
+   * cheap - saves a round trip to the X server */
+  if (bmi->bmiHeader.biCompression == BI_RGB &&
+      ColorUse == DIB_RGB_COLORS &&
+      bmi->bmiHeader.biBitCount == BitsPerFormat(bitmap->SurfObj.iBitmapFormat)/* && bmi->bmiHeader.biBitCount != 1*/)
+  {
+      unsigned int srcwidthb = abs(bitmap->SurfObj.lDelta);
+      int dstwidthb = abs(bitmap->SurfObj.lDelta);//DIB_GetDIBWidthBytes( bmi->bmiHeader.biWidth, bmi->bmiHeader.biBitCount );
+      LPBYTE dbits = bitmap->SurfObj.pvBits, sbits = (LPBYTE)Bits + (StartScan * srcwidthb);
+      int widthb;
+      UINT y;
+
+      //DPRINT("syncing compatible set bits to app bits\n");
+      if ((bmi->bmiHeader.biHeight < 0) ^ (bitmap->SurfObj.lDelta > 0))
+      {
+          dbits += dstwidthb * (ScanLines-1);
+          dstwidthb = -dstwidthb;
+      }
+
+      widthb = min(srcwidthb, abs(dstwidthb));
+
+      DPRINT1("srcwidthb %d, dstwidthb %d, widthb %d\n", srcwidthb, dstwidthb, widthb);
+      DPRINT1("src bitcount %d, dst bitformat %d, dst bytesize %d vs scanlines * width %d\n",
+          bmi->bmiHeader.biBitCount, bitmap->SurfObj.iBitmapFormat, bitmap->SurfObj.cjBits,
+          ScanLines * dstwidthb);
+
+      for (y = 0; y < ScanLines; y++, dbits += dstwidthb, sbits += srcwidthb)
+        memcpy(dbits, sbits, widthb);
+
+      result = ScanLines;
+  }
+#endif

SURFACE_Unlock(bitmap);