Unify graphics buffer format & usage enums for GpuMemoryBuffer & SurfaceFactoryOzone

ui/gfx/buffer_types.h

+// 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,
+  RGBA_4444,
+  RGBA_8888,
+  RGBX_8888,
+  BGRA_8888,
+  YUV_420,
+
+  LAST = YUV_420
+};
+
+// The usage mode affects how a buffer can be used. Only buffers created with
+// MAP can be mapped into the client's address space and accessed by the CPU.
+// PERSISTENT_MAP adds the additional condition that successive Map() calls
+// (with Unmap() calls between) will return a pointer to the same memory
+// contents.
+enum class BufferUsage { MAP, PERSISTENT_MAP, SCANOUT, LAST = SCANOUT };
+
+}  // namespace gfx
+
+#endif  // UI_GFX_BUFFER_TYPES_H_