gfx/ipc/SharedDIBSurface.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef mozilla_gfx_SharedDIBSurface_h
   7 #define mozilla_gfx_SharedDIBSurface_h
   8
   9 #include "gfxImageSurface.h"
  10 #include "SharedDIBWin.h"
  11
  12 #include <windows.h>
  13
  14 namespace mozilla {
  15 namespace gfx {
  16
  17 /**
  18  * A SharedDIBSurface owns an underlying SharedDIBWin.
  19  */
  20 class SharedDIBSurface : public gfxImageSurface
  21 {
  22 public:
  23   typedef base::SharedMemoryHandle Handle;
  24
  25   SharedDIBSurface() { }
  26   ~SharedDIBSurface() { }
  27
  28   /**
  29    * Create this image surface backed by shared memory.
  30    */
  31   bool Create(HDC adc, uint32_t aWidth, uint32_t aHeight, bool aTransparent);
  32
  33   /**
  34    * Attach this surface to shared memory from another process.
  35    */
  36   bool Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
  37               bool aTransparent);
  38
  39   /**
  40    * After drawing to a surface via GDI, GDI must be flushed before the bitmap
  41    * is valid.
  42    */
  43   void Flush() { ::GdiFlush(); }
  44
  45   HDC GetHDC() { return mSharedDIB.GetHDC(); }
  46
  47   nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle* aChildHandle) {
  48     return mSharedDIB.ShareToProcess(aChildProcess, aChildHandle);
  49   }
  50
  51   static bool IsSharedDIBSurface(gfxASurface* aSurface);
  52
  53 private:
  54   SharedDIBWin mSharedDIB;
  55
  56   void InitSurface(uint32_t aWidth, uint32_t aHeight, bool aTransparent);
  57 };
  58
  59 } // namespace gfx
  60 } // namespace mozilla
  61
  62 #endif // mozilla_gfx_SharedDIBSurface_h