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/*
* Copyright (C) 2013 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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"
#include "core/fetch/ResourceLoadPriorityOptimizer.h"
#include "core/rendering/RenderObject.h"
#include "platform/TraceEvent.h"
#include "wtf/Vector.h"
namespace blink {
ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
{
DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
return &s_renderLoadOptimizer;
}
ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
: imageResource(image)
, status(visibilityStatus)
, screenArea(screenArea)
{
}
ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
{
}
ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
{
}
ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
{
}
void ResourceLoadPriorityOptimizer::addRenderObject(RenderObject* renderer)
{
m_objects.add(renderer);
renderer->setHasPendingResourceUpdate(true);
}
void ResourceLoadPriorityOptimizer::removeRenderObject(RenderObject* renderer)
{
if (!renderer->hasPendingResourceUpdate())
return;
m_objects.remove(renderer);
renderer->setHasPendingResourceUpdate(false);
}
void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
{
TRACE_EVENT0("blink", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
m_imageResources.clear();
Vector<RenderObject*> objectsToRemove;
for (const auto& renderObject : m_objects) {
if (!renderObject->updateImageLoadingPriorities())
objectsToRemove.append(renderObject);
}
m_objects.removeAll(objectsToRemove);
updateImageResourcesWithLoadPriority();
}
void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
{
for (const auto& resource : m_imageResources) {
ResourceLoadPriority priority = resource.value->status == Visible ?
ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
if (priority != resource.value->imageResource->resourceRequest().priority()) {
resource.value->imageResource->mutableResourceRequest().setPriority(priority, resource.value->screenArea);
resource.value->imageResource->didChangePriority(priority, resource.value->screenArea);
}
}
m_imageResources.clear();
}
void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
{
if (!img || img->isLoaded())
return;
int screenArea = 0;
if (!screenRect.isEmpty() && status == Visible)
screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
if (!result.isNewEntry && status == Visible) {
result.storedValue->value->status = Visible;
result.storedValue->value->screenArea += screenArea;
}
}
}
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