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// Copyright 2023 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_IMAGE_DAWN_FALLBACK_IMAGE_REPRESENTATION_H_
#define GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_DAWN_FALLBACK_IMAGE_REPRESENTATION_H_
#include "gpu/command_buffer/service/shared_image/shared_image_representation.h"
namespace gpu {
// Wraps a |SharedImageBacking| and exposes it as a wgpu::Texture by performing
// CPU readbacks/uploads.
// Note: the backing must implement UploadFromMemory & ReadbackToMemory.
class GPU_GLES2_EXPORT DawnFallbackImageRepresentation
: public DawnImageRepresentation {
public:
DawnFallbackImageRepresentation(
SharedImageManager* manager,
SharedImageBacking* backing,
MemoryTypeTracker* tracker,
wgpu::Device device,
wgpu::TextureFormat wgpu_format,
std::vector<wgpu::TextureFormat> view_formats);
~DawnFallbackImageRepresentation() override;
wgpu::Texture BeginAccess(wgpu::TextureUsage usage,
wgpu::TextureUsage internal_usage) final;
void EndAccess() final;
private:
struct StagingBuffer {
wgpu::Buffer buffer;
gfx::Size plane_size;
uint32_t bytes_per_row;
};
bool ComputeStagingBufferParams(int plane_index,
uint32_t* bytes_per_row,
size_t* bytes_per_plane) const;
bool AllocateStagingBuffers(wgpu::BufferUsage usage,
bool map_at_creation,
std::vector<StagingBuffer>* buffers);
SkPixmap MappedStagingBufferToPixmap(const StagingBuffer& staging_buffer,
int plane_index,
bool writable);
bool ReadbackFromBacking();
bool UploadToBacking();
wgpu::Device device_;
const wgpu::TextureFormat wgpu_format_;
const std::vector<wgpu::TextureFormat> view_formats_;
wgpu::Texture texture_;
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_DAWN_FALLBACK_IMAGE_REPRESENTATION_H_
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