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/*
* Copyright (C) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if USE(ACCELERATED_COMPOSITING)
#include "TextureManager.h"
#include "LayerRendererChromium.h"
namespace WebCore {
static size_t memoryUseBytes(IntSize size, unsigned textureFormat)
{
// FIXME: This assumes all textures are 4 bytes/pixel, like RGBA.
return size.width() * size.height() * 4;
}
TextureManager::TextureManager(GraphicsContext3D* context, size_t memoryLimitBytes, int maxTextureSize)
: m_context(context)
, m_memoryLimitBytes(memoryLimitBytes)
, m_memoryUseBytes(0)
, m_maxTextureSize(maxTextureSize)
, m_nextToken(1)
{
}
TextureToken TextureManager::getToken()
{
return m_nextToken++;
}
void TextureManager::releaseToken(TextureToken token)
{
TextureMap::iterator it = m_textures.find(token);
if (it != m_textures.end())
removeTexture(token, it->second);
}
bool TextureManager::hasTexture(TextureToken token)
{
if (m_textures.contains(token)) {
// If someone asks about a texture put it at the end of the LRU list.
m_textureLRUSet.remove(token);
m_textureLRUSet.add(token);
return true;
}
return false;
}
bool TextureManager::isProtected(TextureToken token)
{
return token && hasTexture(token) && m_textures.get(token).isProtected;
}
void TextureManager::protectTexture(TextureToken token)
{
ASSERT(hasTexture(token));
ASSERT(!m_textures.get(token).isProtected);
TextureInfo info = m_textures.take(token);
info.isProtected = true;
m_textures.add(token, info);
}
void TextureManager::unprotectAllTextures()
{
for (TextureMap::iterator it = m_textures.begin(); it != m_textures.end(); ++it)
it->second.isProtected = false;
}
bool TextureManager::reduceMemoryToLimit(size_t limit)
{
while (m_memoryUseBytes > limit) {
ASSERT(!m_textureLRUSet.isEmpty());
bool foundCandidate = false;
for (ListHashSet<TextureToken>::iterator lruIt = m_textureLRUSet.begin(); lruIt != m_textureLRUSet.end(); ++lruIt) {
TextureToken token = *lruIt;
TextureInfo info = m_textures.get(token);
if (info.isProtected)
continue;
removeTexture(token, info);
foundCandidate = true;
break;
}
if (!foundCandidate)
return false;
}
return true;
}
void TextureManager::addTexture(TextureToken token, TextureInfo info)
{
ASSERT(!m_textureLRUSet.contains(token));
ASSERT(!m_textures.contains(token));
m_memoryUseBytes += memoryUseBytes(info.size, info.format);
m_textures.set(token, info);
m_textureLRUSet.add(token);
}
void TextureManager::removeTexture(TextureToken token, TextureInfo info)
{
ASSERT(m_textureLRUSet.contains(token));
ASSERT(m_textures.contains(token));
m_memoryUseBytes -= memoryUseBytes(info.size, info.format);
m_textures.remove(token);
ASSERT(m_textureLRUSet.contains(token));
m_textureLRUSet.remove(token);
GLC(m_context.get(), m_context->deleteTexture(info.textureId));
}
unsigned TextureManager::requestTexture(TextureToken token, IntSize size, unsigned format, bool* newTexture)
{
if (size.width() > m_maxTextureSize || size.height() > m_maxTextureSize)
return 0;
TextureMap::iterator it = m_textures.find(token);
if (it != m_textures.end()) {
ASSERT(it->second.size != size || it->second.format != format);
removeTexture(token, it->second);
}
size_t memoryRequiredBytes = memoryUseBytes(size, format);
if (memoryRequiredBytes > m_memoryLimitBytes || !reduceMemoryToLimit(m_memoryLimitBytes - memoryRequiredBytes))
return 0;
unsigned textureId;
GLC(m_context.get(), textureId = m_context->createTexture());
GLC(m_context.get(), m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, textureId));
// Do basic linear filtering on resize.
GLC(m_context.get(), m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR));
GLC(m_context.get(), m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR));
// NPOT textures in GL ES only work when the wrap mode is set to GraphicsContext3D::CLAMP_TO_EDGE.
GLC(m_context.get(), m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE));
GLC(m_context.get(), m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE));
GLC(m_context.get(), m_context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, format, size.width(), size.height(), 0, format, GraphicsContext3D::UNSIGNED_BYTE));
TextureInfo info;
info.size = size;
info.format = format;
info.textureId = textureId;
info.isProtected = true;
addTexture(token, info);
return textureId;
}
}
#endif // USE(ACCELERATED_COMPOSITING)
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