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 "cc/resources/shared_bitmap.h"
   8
   9 namespace cc_blink {
  10
  11 namespace {
  12
  13 SharedBitmapAllocationFunction g_memory_allocator;
  14
  15 }  // namespace
  16
  17 void SetSharedBitmapAllocationFunction(
  18     SharedBitmapAllocationFunction 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     shared_bitmap_ = g_memory_allocator(gfx::Size(size));
  31     size_ = size;
  32   }
  33 }
  34
  35 blink::WebSize WebExternalBitmapImpl::size() {
  36   return size_;
  37 }
  38
  39 uint8* WebExternalBitmapImpl::pixels() {
  40   if (!shared_bitmap_) {
  41     // crbug.com/520417: not sure why a non-null WebExternalBitmap is
  42     // being passed to prepareMailbox when the shared_bitmap_ is null.
  43     // Best hypothesis is that the bitmap is zero-sized.
  44     DCHECK(size_.isEmpty());
  45     return nullptr;
  46   }
  47   return shared_bitmap_->pixels();
  48 }
  49
  50 }  // namespace cc_blink