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
  34 #include "core/fetch/ResourceLoader.h"
  35 #include "core/layout/LayoutObject.h"
  36 #include "platform/TraceEvent.h"
  37
  38 #include "wtf/Vector.h"
  39
  40 namespace blink {
  41
  42 ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
  43 {
  44     DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
  45     return &s_renderLoadOptimizer;
  46 }
  47
  48 ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
  49     : imageResource(image)
  50     , status(visibilityStatus)
  51     , screenArea(screenArea)
  52 {
  53 }
  54
  55 ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
  56 {
  57 }
  58
  59 ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
  60 {
  61 }
  62
  63 ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
  64 {
  65 }
  66
  67 void ResourceLoadPriorityOptimizer::addLayoutObject(LayoutObject* layoutObject)
  68 {
  69     m_objects.add(layoutObject);
  70     layoutObject->setHasPendingResourceUpdate(true);
  71 }
  72
  73 void ResourceLoadPriorityOptimizer::removeLayoutObject(LayoutObject* layoutObject)
  74 {
  75     if (!layoutObject->hasPendingResourceUpdate())
  76         return;
  77     m_objects.remove(layoutObject);
  78     layoutObject->setHasPendingResourceUpdate(false);
  79 }
  80
  81 void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
  82 {
  83     TRACE_EVENT0("blink", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
  84
  85     m_imageResources.clear();
  86
  87     Vector<LayoutObject*> objectsToRemove;
  88     for (const auto& layoutObject : m_objects) {
  89         if (!layoutObject->updateImageLoadingPriorities())
  90             objectsToRemove.append(layoutObject);
  91     }
  92     m_objects.removeAll(objectsToRemove);
  93
  94     updateImageResourcesWithLoadPriority();
  95 }
  96
  97 void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
  98 {
  99     for (const auto& resource : m_imageResources) {
 100         ResourceLoadPriority priority = resource.value->status == Visible ?
 101             ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
 102
 103         if (resource.value->imageResource->loader() && resource.value->imageResource->loader()->shouldUseIncreasedPriorities()) {
 104             priority = resource.value->status == Visible ?
 105                 ResourceLoadPriorityHigh : ResourceLoadPriorityLow;
 106         }
 107
 108         if (priority != resource.value->imageResource->resourceRequest().priority()) {
 109             resource.value->imageResource->mutableResourceRequest().setPriority(priority, resource.value->screenArea);
 110             resource.value->imageResource->didChangePriority(priority, resource.value->screenArea);
 111         }
 112     }
 113     m_imageResources.clear();
 114 }
 115
 116 void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
 117 {
 118     if (!img || img->isLoaded())
 119         return;
 120
 121     int screenArea = 0;
 122     if (!screenRect.isEmpty() && status == Visible)
 123         screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
 124
 125     ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
 126     if (!result.isNewEntry && status == Visible) {
 127         result.storedValue->value->status = Visible;
 128         result.storedValue->value->screenArea += screenArea;
 129     }
 130 }
 131
 132 }