// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/blink/web_external_bitmap_impl.h"

#include <stdint.h>

#include "cc/resources/shared_bitmap.h"

namespace cc_blink {

namespace {

SharedBitmapAllocationFunction g_memory_allocator;

}  // namespace

void SetSharedBitmapAllocationFunction(
    SharedBitmapAllocationFunction allocator) {
  g_memory_allocator = allocator;
}

WebExternalBitmapImpl::WebExternalBitmapImpl() {
}

WebExternalBitmapImpl::~WebExternalBitmapImpl() {
}

void WebExternalBitmapImpl::setSize(blink::WebSize size) {
  if (size != size_) {
    shared_bitmap_ = g_memory_allocator(gfx::Size(size));
    size_ = size;
  }
}

blink::WebSize WebExternalBitmapImpl::size() {
  return size_;
}

uint8_t* WebExternalBitmapImpl::pixels() {
  if (!shared_bitmap_) {
    // crbug.com/520417: not sure why a non-null WebExternalBitmap is
    // being passed to prepareMailbox when the shared_bitmap_ is null.
    // Best hypothesis is that the bitmap is zero-sized.
    DCHECK(size_.isEmpty());
    return nullptr;
  }
  return shared_bitmap_->pixels();
}

}  // namespace cc_blink