| // 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. |
| |
| #ifndef CC_RESOURCES_CROSS_THREAD_SHARED_BITMAP_H_ |
| #define CC_RESOURCES_CROSS_THREAD_SHARED_BITMAP_H_ |
| |
| #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> { |
| public: |
| 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_; } |
| |
| private: |
| friend base::RefCountedThreadSafe<CrossThreadSharedBitmap>; |
| |
| ~CrossThreadSharedBitmap(); |
| |
| const viz::SharedBitmapId id_; |
| const base::ReadOnlySharedMemoryRegion region_; |
| base::WritableSharedMemoryMapping mapping_; |
| const gfx::Size size_; |
| const viz::ResourceFormat format_; |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_RESOURCES_CROSS_THREAD_SHARED_BITMAP_H_ |