gpu/command_buffer/service/shared_image_backing_factory_ahardwarebuffer.h

// 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 GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_BACKING_FACTORY_AHARDWAREBUFFER_H_
#define GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_BACKING_FACTORY_AHARDWAREBUFFER_H_

#include "base/macros.h"
#include "components/viz/common/resources/resource_format.h"
#include "gpu/command_buffer/service/shared_image_backing_factory.h"
#include "gpu/gpu_gles2_export.h"
#include "ui/gl/gl_bindings.h"

namespace gfx {
class Size;
class ColorSpace;
}  // namespace gfx

namespace gpu {
class SharedImageBacking;
class GpuDriverBugWorkarounds;
struct GpuFeatureInfo;
struct Mailbox;

// Implementation of SharedImageBackingFactory that produces AHardwareBuffer
// backed SharedImages. This is meant to be used on Android only.
class GPU_GLES2_EXPORT SharedImageBackingFactoryAHB
    : public SharedImageBackingFactory {
 public:
  SharedImageBackingFactoryAHB(const GpuDriverBugWorkarounds& workarounds,
                               const GpuFeatureInfo& gpu_feature_info);
  ~SharedImageBackingFactoryAHB() override;

  // SharedImageBackingFactory implementation.
  std::unique_ptr<SharedImageBacking> CreateSharedImage(
      const Mailbox& mailbox,
      viz::ResourceFormat format,
      const gfx::Size& size,
      const gfx::ColorSpace& color_space,
      uint32_t usage) override;
  std::unique_ptr<SharedImageBacking> CreateSharedImage(
      const Mailbox& mailbox,
      viz::ResourceFormat format,
      const gfx::Size& size,
      const gfx::ColorSpace& color_space,
      uint32_t usage,
      base::span<const uint8_t> pixel_data) override;
  std::unique_ptr<SharedImageBacking> CreateSharedImage(
      const Mailbox& mailbox,
      int client_id,
      gfx::GpuMemoryBufferHandle handle,
      gfx::BufferFormat format,
      SurfaceHandle surface_handle,
      const gfx::Size& size,
      const gfx::ColorSpace& color_space,
      uint32_t usage) override;

 private:
  struct FormatInfo {
    FormatInfo();
    ~FormatInfo();

    // Whether this format is supported by AHardwareBuffer.
    bool ahb_supported = false;
    unsigned int ahb_format = 0;

    // Whether this format can be used to create a GL texture from the AHB.
    bool gl_supported = false;

    // GL internal_format/format/type triplet.
    GLuint internal_format = 0;
    GLenum gl_format = 0;
    GLenum gl_type = 0;
  };

  FormatInfo format_info_[viz::RESOURCE_FORMAT_MAX + 1];

  // Used to limit the max size of AHardwareBuffer.
  int32_t max_gl_texture_size_ = 0;

  DISALLOW_COPY_AND_ASSIGN(SharedImageBackingFactoryAHB);
};

}  // namespace gpu

#endif  // GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_BACKING_FACTORY_AHARDWAREBUFFER_H_