cc/resource.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/resource.h"
   6 #include "third_party/khronos/GLES2/gl2ext.h"
   7
   8 namespace cc {
   9
  10 void Resource::set_dimensions(const gfx::Size& size, GLenum format) {
  11   size_ = size;
  12   format_ = format;
  13 }
  14
  15 size_t Resource::bytes() const {
  16   if (size_.IsEmpty())
  17     return 0;
  18
  19   return MemorySizeBytes(size_, format_);
  20 }
  21
  22 size_t Resource::BytesPerPixel(GLenum format) {
  23   size_t components_per_pixel = 0;
  24   size_t bytes_per_component = 1;
  25   switch (format) {
  26     case GL_RGBA:
  27     case GL_BGRA_EXT:
  28       components_per_pixel = 4;
  29       break;
  30     case GL_LUMINANCE:
  31       components_per_pixel = 1;
  32       break;
  33     default:
  34       NOTREACHED();
  35   }
  36   return components_per_pixel * bytes_per_component;
  37 }
  38
  39 size_t Resource::MemorySizeBytes(const gfx::Size& size, GLenum format) {
  40   return BytesPerPixel(format) * size.width() * size.height();
  41 }
  42
  43
  44 }  // namespace cc