gfx/ipc/SharedDIBSurface.cpp

   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 #include "SharedDIBSurface.h"
   7
   8 #include "cairo.h"
   9
  10 namespace mozilla {
  11 namespace gfx {
  12
  13 static const cairo_user_data_key_t SHAREDDIB_KEY = {0};
  14
  15 static const long kBytesPerPixel = 4;
  16
  17 bool
  18 SharedDIBSurface::Create(HDC adc, uint32_t aWidth, uint32_t aHeight,
  19                          bool aTransparent)
  20 {
  21   nsresult rv = mSharedDIB.Create(adc, aWidth, aHeight, aTransparent);
  22   if (NS_FAILED(rv) || !mSharedDIB.IsValid())
  23     return false;
  24
  25   InitSurface(aWidth, aHeight, aTransparent);
  26   return true;
  27 }
  28
  29 bool
  30 SharedDIBSurface::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
  31                          bool aTransparent)
  32 {
  33   nsresult rv = mSharedDIB.Attach(aHandle, aWidth, aHeight, aTransparent);
  34   if (NS_FAILED(rv) || !mSharedDIB.IsValid())
  35     return false;
  36
  37   InitSurface(aWidth, aHeight, aTransparent);
  38   return true;
  39 }
  40
  41 void
  42 SharedDIBSurface::InitSurface(uint32_t aWidth, uint32_t aHeight,
  43                               bool aTransparent)
  44 {
  45   long stride = long(aWidth * kBytesPerPixel);
  46   unsigned char* data = reinterpret_cast<unsigned char*>(mSharedDIB.GetBits());
  47
  48   gfxImageFormat format = aTransparent ? gfxImageFormat::ARGB32 : gfxImageFormat::RGB24;
  49
  50   gfxImageSurface::InitWithData(data, gfxIntSize(aWidth, aHeight),
  51                                 stride, format);
  52
  53   cairo_surface_set_user_data(mSurface, &SHAREDDIB_KEY, this, nullptr);
  54 }
  55
  56 bool
  57 SharedDIBSurface::IsSharedDIBSurface(gfxASurface* aSurface)
  58 {
  59   return aSurface &&
  60     aSurface->GetType() == gfxSurfaceType::Image &&
  61     aSurface->GetData(&SHAREDDIB_KEY);
  62 }
  63
  64 } // namespace gfx
  65 } // namespace mozilla