third_party/WebKit/Source/core/fetch/ResourceLoadPriorityOptimizer.cpp

   1 /*
   2  * Copyright (C) 2013 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
  33 #include "core/layout/LayoutObject.h"
  34 #include "platform/TraceEvent.h"
  35
  36 #include "wtf/Vector.h"
  37
  38 namespace blink {
  39
  40 ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
  41 {
  42     DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
  43     return &s_renderLoadOptimizer;
  44 }
  45
  46 ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
  47     : imageResource(image)
  48     , status(visibilityStatus)
  49     , screenArea(screenArea)
  50 {
  51 }
  52
  53 ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
  54 {
  55 }
  56
  57 ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
  58 {
  59 }
  60
  61 ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
  62 {
  63 }
  64
  65 void ResourceLoadPriorityOptimizer::addLayoutObject(LayoutObject* layoutObject)
  66 {
  67     m_objects.add(layoutObject);
  68     layoutObject->setHasPendingResourceUpdate(true);
  69 }
  70
  71 void ResourceLoadPriorityOptimizer::removeLayoutObject(LayoutObject* layoutObject)
  72 {
  73     if (!layoutObject->hasPendingResourceUpdate())
  74         return;
  75     m_objects.remove(layoutObject);
  76     layoutObject->setHasPendingResourceUpdate(false);
  77 }
  78
  79 void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
  80 {
  81     TRACE_EVENT0("blink", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
  82
  83     m_imageResources.clear();
  84
  85     Vector<LayoutObject*> objectsToRemove;
  86     for (const auto& layoutObject : m_objects) {
  87         if (!layoutObject->updateImageLoadingPriorities())
  88             objectsToRemove.append(layoutObject);
  89     }
  90     m_objects.removeAll(objectsToRemove);
  91
  92     updateImageResourcesWithLoadPriority();
  93 }
  94
  95 void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
  96 {
  97     for (const auto& resource : m_imageResources) {
  98         ResourceLoadPriority priority = resource.value->status == Visible ?
  99             ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
 100
 101         if (priority != resource.value->imageResource->resourceRequest().priority()) {
 102             resource.value->imageResource->mutableResourceRequest().setPriority(priority, resource.value->screenArea);
 103             resource.value->imageResource->didChangePriority(priority, resource.value->screenArea);
 104         }
 105     }
 106     m_imageResources.clear();
 107 }
 108
 109 void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
 110 {
 111     if (!img || img->isLoaded())
 112         return;
 113
 114     int screenArea = 0;
 115     if (!screenRect.isEmpty() && status == Visible)
 116         screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
 117
 118     ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
 119     if (!result.isNewEntry && status == Visible) {
 120         result.storedValue->value->status = Visible;
 121         result.storedValue->value->screenArea += screenArea;
 122     }
 123 }
 124
 125 }