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      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/resources/resource.h"
      6 #include "third_party/khronos/GLES2/gl2ext.h"
      7 
      8 namespace cc {
      9 
     10 size_t Resource::bytes() const {
     11   if (size_.IsEmpty())
     12     return 0;
     13 
     14   return MemorySizeBytes(size_, format_);
     15 }
     16 
     17 size_t Resource::BytesPerPixel(GLenum format) {
     18   size_t components_per_pixel = 0;
     19   size_t bytes_per_component = 1;
     20   switch (format) {
     21     case GL_RGBA:
     22     case GL_BGRA_EXT:
     23       components_per_pixel = 4;
     24       break;
     25     case GL_LUMINANCE:
     26       components_per_pixel = 1;
     27       break;
     28     default:
     29       NOTREACHED();
     30   }
     31   return components_per_pixel * bytes_per_component;
     32 }
     33 
     34 size_t Resource::MemorySizeBytes(gfx::Size size, GLenum format) {
     35   return BytesPerPixel(format) * size.width() * size.height();
     36 }
     37 
     38 
     39 }  // namespace cc
     40