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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 "config.h"
#include "cc/texture.h"
#include "third_party/khronos/GLES2/gl2ext.h"
namespace cc {
void Texture::setDimensions(const gfx::Size& size, GLenum format)
{
m_size = size;
m_format = format;
}
size_t Texture::bytes() const
{
if (m_size.IsEmpty())
return 0u;
return memorySizeBytes(m_size, m_format);
}
size_t Texture::bytesPerPixel(GLenum format)
{
unsigned int componentsPerPixel = 0;
unsigned int bytesPerComponent = 1;
switch (format) {
case GL_RGBA:
case GL_BGRA_EXT:
componentsPerPixel = 4;
break;
case GL_LUMINANCE:
componentsPerPixel = 1;
break;
default:
NOTREACHED();
}
return componentsPerPixel * bytesPerComponent;
}
size_t Texture::memorySizeBytes(const gfx::Size& size, GLenum format)
{
return bytesPerPixel(format) * size.width() * size.height();
}
}
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