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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_SERVICE_SHARED_MEMORY_REGION_WRAPPER_H_
#define GPU_COMMAND_BUFFER_SERVICE_SHARED_MEMORY_REGION_WRAPPER_H_
#include <utility>
#include <vector>
#include "base/containers/span.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/unguessable_token.h"
#include "gpu/gpu_gles2_export.h"
#include "third_party/skia/include/core/SkPixmap.h"
#include "ui/gfx/buffer_types.h"
#include "ui/gfx/geometry/size.h"
namespace gfx {
struct GpuMemoryBufferHandle;
}
namespace gpu {
// Wrapper for shared memory region from a GpuMemoryBuffer with type
// SHARED_MEMORY_BUFFER.
class GPU_GLES2_EXPORT SharedMemoryRegionWrapper {
public:
SharedMemoryRegionWrapper();
SharedMemoryRegionWrapper(SharedMemoryRegionWrapper&& other);
SharedMemoryRegionWrapper& operator=(SharedMemoryRegionWrapper&& other);
~SharedMemoryRegionWrapper();
// Validates that size, stride and format parameters make sense and maps
// memory for shared memory owned by |handle|. Shared memory stays mapped
// until destruction.
bool Initialize(const gfx::GpuMemoryBufferHandle& handle,
const gfx::Size& size,
gfx::BufferFormat format);
bool IsValid() const;
uint8_t* GetMemory(int plane_index) {
return const_cast<uint8_t*>(std::as_const(*this).GetMemory(plane_index));
}
const uint8_t* GetMemory(int plane_index) const;
size_t GetStride(int plane_index) const;
// Returns SkPixmap pointing to memory for offset.
SkPixmap MakePixmapForPlane(const SkImageInfo& info, int plane_index) const;
base::span<const uint8_t> GetMemoryPlanes() const;
const base::UnguessableToken& GetMappingGuid() const;
private:
struct PlaneData {
size_t offset = 0;
size_t stride = 0;
};
base::WritableSharedMemoryMapping mapping_;
std::vector<PlaneData> planes_;
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SHARED_MEMORY_REGION_WRAPPER_H_
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