ui/gl/gl_image_shared_memory.cc

   1 // Copyright 2014 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 "ui/gl/gl_image_shared_memory.h"
   6
   7 #include "base/logging.h"
   8 #include "base/process/process_handle.h"
   9
  10 namespace gfx {
  11
  12 GLImageSharedMemory::GLImageSharedMemory(const gfx::Size& size,
  13                                          unsigned internalformat)
  14     : GLImageMemory(size, internalformat) {
  15 }
  16
  17 GLImageSharedMemory::~GLImageSharedMemory() {
  18   DCHECK(!shared_memory_);
  19 }
  20
  21 bool GLImageSharedMemory::Initialize(const gfx::GpuMemoryBufferHandle& handle) {
  22   if (!HasValidFormat())
  23     return false;
  24
  25   if (!base::SharedMemory::IsHandleValid(handle.handle))
  26     return false;
  27
  28   base::SharedMemory shared_memory(handle.handle, true);
  29
  30   // Duplicate the handle.
  31   base::SharedMemoryHandle duped_shared_memory_handle;
  32   if (!shared_memory.ShareToProcess(base::GetCurrentProcessHandle(),
  33                                     &duped_shared_memory_handle)) {
  34     DVLOG(0) << "Failed to duplicate shared memory handle.";
  35     return false;
  36   }
  37
  38   scoped_ptr<base::SharedMemory> duped_shared_memory(
  39       new base::SharedMemory(duped_shared_memory_handle, true));
  40
  41   if (!duped_shared_memory->Map(Bytes())) {
  42     DVLOG(0) << "Failed to map shared memory.";
  43     return false;
  44   }
  45
  46   DCHECK(!shared_memory_);
  47   shared_memory_ = duped_shared_memory.Pass();
  48   GLImageMemory::Initialize(
  49       static_cast<unsigned char*>(shared_memory_->memory()));
  50   return true;
  51 }
  52
  53 void GLImageSharedMemory::Destroy(bool have_context) {
  54   GLImageMemory::Destroy(have_context);
  55   shared_memory_.reset();
  56 }
  57
  58 }  // namespace gfx