content/renderer/pepper/pepper_platform_image_2d_impl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/pepper/pepper_platform_image_2d_impl.h"
   6
   7 #include "build/build_config.h"
   8 #include "content/common/view_messages.h"
   9 #include "content/renderer/render_thread_impl.h"
  10 #include "ui/surface/transport_dib.h"
  11
  12 namespace content {
  13
  14 PepperPlatformImage2DImpl::PepperPlatformImage2DImpl(int width,
  15                                                      int height,
  16                                                      TransportDIB* dib)
  17     : width_(width),
  18       height_(height),
  19       dib_(dib) {
  20 }
  21
  22 // On Mac, we have to tell the browser to free the transport DIB.
  23 PepperPlatformImage2DImpl::~PepperPlatformImage2DImpl() {
  24 #if defined(OS_MACOSX)
  25   if (dib_) {
  26     RenderThreadImpl::current()->Send(
  27         new ViewHostMsg_FreeTransportDIB(dib_->id()));
  28   }
  29 #endif
  30 }
  31
  32 // static
  33 PepperPlatformImage2DImpl* PepperPlatformImage2DImpl::Create(int width,
  34                                                              int height) {
  35   uint32 buffer_size = width * height * 4;
  36
  37   // Allocate the transport DIB and the PlatformCanvas pointing to it.
  38 #if defined(OS_MACOSX)
  39   // On the Mac, shared memory has to be created in the browser in order to
  40   // work in the sandbox.  Do this by sending a message to the browser
  41   // requesting a TransportDIB (see also
  42   // chrome/renderer/webplugin_delegate_proxy.cc, method
  43   // WebPluginDelegateProxy::CreateBitmap() for similar code). The TransportDIB
  44   // is cached in the browser, and is freed (in typical cases) by the
  45   // PepperPlatformImage2DImpl's destructor.
  46   TransportDIB::Handle dib_handle;
  47   IPC::Message* msg = new ViewHostMsg_AllocTransportDIB(buffer_size,
  48                                                         true,
  49                                                         &dib_handle);
  50   if (!RenderThreadImpl::current()->Send(msg))
  51     return NULL;
  52   if (!TransportDIB::is_valid_handle(dib_handle))
  53     return NULL;
  54
  55   TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
  56 #else
  57   static int next_dib_id = 0;
  58   TransportDIB* dib = TransportDIB::Create(buffer_size, next_dib_id++);
  59   if (!dib)
  60     return NULL;
  61 #endif
  62
  63   return new PepperPlatformImage2DImpl(width, height, dib);
  64 }
  65
  66 SkCanvas* PepperPlatformImage2DImpl::Map() {
  67   return dib_->GetPlatformCanvas(width_, height_);
  68 }
  69
  70 intptr_t PepperPlatformImage2DImpl::GetSharedMemoryHandle(
  71     uint32* byte_count) const {
  72   *byte_count = dib_->size();
  73 #if defined(OS_WIN)
  74   return reinterpret_cast<intptr_t>(dib_->handle());
  75 #elif defined(OS_MACOSX) || defined(OS_ANDROID)
  76   return static_cast<intptr_t>(dib_->handle().fd);
  77 #elif defined(OS_POSIX)
  78   return static_cast<intptr_t>(dib_->handle());
  79 #endif
  80 }
  81
  82 TransportDIB* PepperPlatformImage2DImpl::GetTransportDIB() const {
  83   return dib_.get();
  84 }
  85
  86 }  // namespace content