cc/blink/web_external_bitmap_impl.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 "cc/blink/web_external_bitmap_impl.h"
   6
   7 #include "base/memory/shared_memory.h"
   8
   9 namespace cc_blink {
  10
  11 namespace {
  12
  13 SharedMemoryAllocationFunction g_memory_allocator;
  14
  15 }  // namespace
  16
  17 void SetSharedMemoryAllocationFunction(
  18     SharedMemoryAllocationFunction allocator) {
  19   g_memory_allocator = allocator;
  20 }
  21
  22 WebExternalBitmapImpl::WebExternalBitmapImpl() {
  23 }
  24
  25 WebExternalBitmapImpl::~WebExternalBitmapImpl() {
  26 }
  27
  28 void WebExternalBitmapImpl::setSize(blink::WebSize size) {
  29   if (size != size_) {
  30     size_t byte_size = size.width * size.height * 4;
  31     shared_memory_ = g_memory_allocator(byte_size);
  32     if (shared_memory_)
  33       shared_memory_->Map(byte_size);
  34     size_ = size;
  35   }
  36 }
  37
  38 blink::WebSize WebExternalBitmapImpl::size() {
  39   return size_;
  40 }
  41
  42 uint8* WebExternalBitmapImpl::pixels() {
  43   return static_cast<uint8*>(shared_memory_->memory());
  44 }
  45
  46 }  // namespace cc_blink