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128 lines
4.6 KiB
C++
128 lines
4.6 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "core/fetch/ResourceLoadPriorityOptimizer.h"
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#include "core/rendering/RenderObject.h"
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#include "platform/TraceEvent.h"
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#include "wtf/Vector.h"
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namespace blink {
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ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
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{
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DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
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return &s_renderLoadOptimizer;
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}
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ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
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: imageResource(image)
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, status(visibilityStatus)
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, screenArea(screenArea)
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{
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}
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ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
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{
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}
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ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
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{
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}
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ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
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{
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}
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void ResourceLoadPriorityOptimizer::addRenderObject(RenderObject* renderer)
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{
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m_objects.add(renderer);
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renderer->setHasPendingResourceUpdate(true);
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}
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void ResourceLoadPriorityOptimizer::removeRenderObject(RenderObject* renderer)
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{
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if (!renderer->hasPendingResourceUpdate())
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return;
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m_objects.remove(renderer);
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renderer->setHasPendingResourceUpdate(false);
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}
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void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
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{
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TRACE_EVENT0("blink", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
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m_imageResources.clear();
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Vector<RenderObject*> objectsToRemove;
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for (RenderObjectSet::iterator it = m_objects.begin(); it != m_objects.end(); ++it) {
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RenderObject* obj = *it;
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if (!obj->updateImageLoadingPriorities()) {
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objectsToRemove.append(obj);
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}
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}
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m_objects.removeAll(objectsToRemove);
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updateImageResourcesWithLoadPriority();
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}
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void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
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{
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for (ImageResourceMap::iterator it = m_imageResources.begin(); it != m_imageResources.end(); ++it) {
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ResourceLoadPriority priority = it->value->status == Visible ?
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ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
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if (priority != it->value->imageResource->resourceRequest().priority()) {
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it->value->imageResource->mutableResourceRequest().setPriority(priority, it->value->screenArea);
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it->value->imageResource->didChangePriority(priority, it->value->screenArea);
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}
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}
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m_imageResources.clear();
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}
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void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
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{
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if (!img || img->isLoaded())
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return;
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int screenArea = 0;
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if (!screenRect.isEmpty() && status == Visible)
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screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
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ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
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if (!result.isNewEntry && status == Visible) {
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result.storedValue->value->status = status;
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result.storedValue->value->screenArea = status;
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}
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}
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}
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