Exclusively lock surface bits before reading or writing them

[reactos.git] / reactos / include / win32k / bitmaps.h

diff --git a/reactos/include/win32k/bitmaps.h b/reactos/include/win32k/bitmaps.h
index 79815c3..9875d69 100644 (file)
--- a/reactos/include/win32k/bitmaps.h
+++ b/reactos/include/win32k/bitmaps.h
@@ -11,10 +11,12 @@ typedef struct _BITMAPOBJ
   SURFOBJ     SurfObj;
   FLONG              flHooks;
   FLONG       flFlags;
-  SIZE        dimension;   /* For SetBitmapDimension(), do NOT use
-                              to get width/height of bitmap, use
-                              bitmap.bmWidth/bitmap.bmHeight for
-                              that */
+  SIZE        dimension;    /* For SetBitmapDimension(), do NOT use
+                               to get width/height of bitmap, use
+                               bitmap.bmWidth/bitmap.bmHeight for
+                               that */
+  PFAST_MUTEX BitsLock;     /* You need to hold this lock before you touch
+                               the actual bits in the bitmap */
 
   /* For device-independent bitmaps: */
   DIBSECTION *dib;
@@ -34,6 +36,11 @@ typedef struct _BITMAPOBJ
 #define  BITMAPOBJ_UnlockBitmap(pBMObj) EngUnlockSurface(&pBMObj->SurfObj)
 BOOL INTERNAL_CALL BITMAP_Cleanup(PVOID ObjectBody);
 
+BOOL INTERNAL_CALL BITMAPOBJ_InitBitsLock(BITMAPOBJ *pBMObj);
+#define BITMAPOBJ_LockBitmapBits(pBMObj) ExAcquireFastMutex((pBMObj)->BitsLock)
+#define BITMAPOBJ_UnlockBitmapBits(pBMObj) ExReleaseFastMutex((pBMObj)->BitsLock)
+void INTERNAL_CALL BITMAPOBJ_CleanupBitsLock(BITMAPOBJ *pBMObj);
+
 INT     FASTCALL BITMAPOBJ_GetWidthBytes (INT bmWidth, INT bpp);
 HBITMAP FASTCALL BITMAPOBJ_CopyBitmap (HBITMAP  hBitmap);
 INT     FASTCALL DIB_GetDIBWidthBytes (INT  width, INT  depth);