text: // Copyright 2015 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 UI_GFX_BUFFER_TYPES_H_
  #define UI_GFX_BUFFER_TYPES_H_
  
  namespace gfx {
  
  // The format needs to be taken into account when mapping a buffer into the
  // client's address space.
  enum class BufferFormat {
    ATC,
    ATCIA,
    DXT1,
    DXT5,
    ETC1,
    R_8,
    BGR_565,
    RGBA_4444,
    RGBX_8888,
    RGBA_8888,
    BGRX_8888,
    BGRA_8888,
    YUV_420,
    YUV_420_BIPLANAR,
    UYVY_422,
  
    LAST = UYVY_422
  };
  
  // The usage mode affects how a buffer can be used. Only buffers created with
  // *_CPU_READ_WRITE_* can be mapped into the client's address space and accessed
  // by the CPU. *_CPU_READ_WRITE_PERSISTENT adds the additional condition that
  // successive Map() calls (with Unmap() calls between) will return a pointer to
  // the same memory contents. SCANOUT implies GPU_READ_WRITE.
  // TODO(reveman): Add GPU_READ_WRITE for use-cases where SCANOUT is not
  // required.
  enum class BufferUsage {
    GPU_READ,
    SCANOUT,
    GPU_READ_CPU_READ_WRITE,
    // TODO(reveman): Merge this with GPU_READ_CPU_READ_WRITE when SurfaceTexture
    // backed buffers are single buffered and support it.
    GPU_READ_CPU_READ_WRITE_PERSISTENT,
  
    LAST = GPU_READ_CPU_READ_WRITE_PERSISTENT
  };
  
  }  // namespace gfx
  
  #endif  // UI_GFX_BUFFER_TYPES_H_
  