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// Copyright 2012 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.
#include "cc/resources/resource.h"
#include "third_party/khronos/GLES2/gl2ext.h"
namespace cc {
size_t Resource::bytes() const {
if (size_.IsEmpty())
return 0;
return MemorySizeBytes(size_, format_);
}
size_t Resource::BytesPerPixel(GLenum format) {
size_t components_per_pixel = 0;
size_t bytes_per_component = 1;
switch (format) {
case GL_RGBA:
case GL_BGRA_EXT:
components_per_pixel = 4;
break;
case GL_LUMINANCE:
components_per_pixel = 1;
break;
default:
NOTREACHED();
}
return components_per_pixel * bytes_per_component;
}
size_t Resource::MemorySizeBytes(gfx::Size size, GLenum format) {
return BytesPerPixel(format) * size.width() * size.height();
}
} // namespace cc
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