Rob Shearman : winex11.drv: Optimise getting the bits of a DIB after calling SetDIBits.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 428ada3c8a12dbeaba42d13f445e67e488fea94a
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=428ada3c8a12dbeaba42d13f44...

Author: Rob Shearman <rob(a)codeweavers.com>
Date:   Thu Feb 21 16:44:59 2008 +0000

winex11.drv: Optimise getting the bits of a DIB after calling SetDIBits.

Sync the application's bits in SetDIBits if the input bits are in 
exactly the same format and the size of the image is small enough not to 
cause a performance hit (in case the application doesn't get ever access 
the bits directly).

---

 dlls/winex11.drv/dib.c |   50 +++++++++++++++++++++++++++++++++++++----------
 1 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/dlls/winex11.drv/dib.c b/dlls/winex11.drv/dib.c
index b05d904..91aab99 100644
--- a/dlls/winex11.drv/dib.c
+++ b/dlls/winex11.drv/dib.c
@@ -108,6 +108,17 @@ static void X11DRV_DIB_Unlock(X_PHYSBITMAP *,BOOL);
 */
 
 /***********************************************************************
+ *           DIB_DoProtectDIBSection
+ */
+static void X11DRV_DIB_DoProtectDIBSection( X_PHYSBITMAP *physBitmap, DWORD new_prot )
+{
+    DWORD old_prot;
+
+    VirtualProtect(physBitmap->base, physBitmap->size, new_prot, &old_prot);
+    TRACE("Changed protection from %d to %d\n", old_prot, new_prot);
+}
+
+/***********************************************************************
  *           X11DRV_DIB_GetXImageWidthBytes
  *
  * Return the width of an X image in bytes
@@ -3960,6 +3971,34 @@ INT X11DRV_SetDIBits( X11DRV_PDEVICE *physDev, HBITMAP hbitmap, UINT startscan,
   descr.dibpitch  = ((descr.infoWidth * descr.infoBpp + 31) &~31) / 8;
   X11DRV_DIB_Lock( physBitmap, DIB_Status_GdiMod );
   result = X11DRV_DIB_SetImageBits( &descr );
+
+  /* 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 (descr.compression == BI_RGB &&
+      coloruse == DIB_RGB_COLORS &&
+      descr.infoBpp == bitmap.bmBitsPixel &&
+      physBitmap->base && physBitmap->size < 65536)
+  {
+      unsigned int srcwidthb = bitmap.bmWidthBytes;
+      int dstwidthb = X11DRV_DIB_GetDIBWidthBytes( width, descr.infoBpp );
+      LPBYTE dbits = physBitmap->base, sbits = (LPBYTE)bits + (startscan * srcwidthb);
+      int widthb;
+      UINT y;
+
+      TRACE("syncing compatible set bits to app bits\n");
+      if ((tmpheight < 0) ^ (bitmap.bmHeight < 0))
+      {
+          dbits = (LPBYTE)bits + (dstwidthb * (lines-1));
+          dstwidthb = -dstwidthb;
+      }
+	  X11DRV_DIB_DoProtectDIBSection( physBitmap, PAGE_READWRITE );
+      widthb = min(srcwidthb, abs(dstwidthb));
+      for (y = 0; y < lines; y++, dbits += dstwidthb, sbits += srcwidthb)
+          memcpy(dbits, sbits, widthb);
+	  X11DRV_DIB_DoProtectDIBSection( physBitmap, PAGE_READONLY );
+	  physBitmap->status = DIB_Status_InSync;
+  }
   X11DRV_DIB_Unlock( physBitmap, TRUE );
 
   HeapFree(GetProcessHeap(), 0, descr.colorMap);
@@ -4116,17 +4155,6 @@ INT X11DRV_GetDIBits( X11DRV_PDEVICE *physDev, HBITMAP hbitmap, UINT startscan,
 }
 
 /***********************************************************************
- *           DIB_DoProtectDIBSection
- */
-static void X11DRV_DIB_DoProtectDIBSection( X_PHYSBITMAP *physBitmap, DWORD new_prot )
-{
-    DWORD old_prot;
-
-    VirtualProtect(physBitmap->base, physBitmap->size, new_prot, &old_prot);
-    TRACE("Changed protection from %d to %d\n", old_prot, new_prot);
-}
-
-/***********************************************************************
  *           X11DRV_DIB_DoCopyDIBSection
  */
 static void X11DRV_DIB_DoCopyDIBSection(X_PHYSBITMAP *physBitmap, BOOL toDIB,