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// Copyright 2018 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 <memory>
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/ref_counted.h"
#include "base/memory/shared_memory_mapping.h"
#include "cc/cc_export.h"
#include "components/viz/common/resources/resource_format.h"
#include "components/viz/common/resources/shared_bitmap.h"
#include "ui/gfx/geometry/size.h"
namespace cc {
// This class holds ownership of a base::ReadOnlySharedMemoryRegion and its
// base::WritableSharedMemoryMapping for use as a composited resource, and is
// refcounted in order to share ownership with the LayerTreeHost, via
// TextureLayer, which needs access to the base::ReadOnlySharedMemory from
// the compositor thread. Because all the fields exposed are const, they can
// be used from any thread without conflict, as they only read existing states.
class CC_EXPORT CrossThreadSharedBitmap
: public base::RefCountedThreadSafe<CrossThreadSharedBitmap> {
CrossThreadSharedBitmap(const viz::SharedBitmapId& id,
base::MappedReadOnlyRegion shm,
const gfx::Size& size,
viz::ResourceFormat format);
const viz::SharedBitmapId& id() const { return id_; }
const base::ReadOnlySharedMemoryRegion& shared_region() const {
return region_;
void* memory() const { return mapping_.memory(); }
const gfx::Size& size() const { return size_; }
viz::ResourceFormat format() const { return format_; }
friend base::RefCountedThreadSafe<CrossThreadSharedBitmap>;
const viz::SharedBitmapId id_;
const base::ReadOnlySharedMemoryRegion region_;
base::WritableSharedMemoryMapping mapping_;
const gfx::Size size_;
const viz::ResourceFormat format_;
} // namespace cc