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

   1 /*
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   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
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  16  * this software without specific prior written permission.
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  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  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/rendering/RenderObject.h"
  34 #include "platform/TraceEvent.h"
  35
  36 #include "wtf/Vector.h"
  37
  38 namespace WebCore {
  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::addRenderObject(RenderObject* renderer)
  66 {
  67     m_objects.add(renderer);
  68     renderer->setHasPendingResourceUpdate(true);
  69 }
  70
  71 void ResourceLoadPriorityOptimizer::removeRenderObject(RenderObject* renderer)
  72 {
  73     if (!renderer->hasPendingResourceUpdate())
  74         return;
  75     m_objects.remove(renderer);
  76     renderer->setHasPendingResourceUpdate(false);
  77 }
  78
  79 void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
  80 {
  81     TRACE_EVENT0("webkit", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
  82
  83     m_imageResources.clear();
  84
  85     Vector<RenderObject*> objectsToRemove;
  86     for (RenderObjectSet::iterator it = m_objects.begin(); it != m_objects.end(); ++it) {
  87         RenderObject* obj = *it;
  88         if (!obj->updateImageLoadingPriorities()) {
  89             objectsToRemove.append(obj);
  90         }
  91     }
  92     m_objects.removeAll(objectsToRemove);
  93
  94     updateImageResourcesWithLoadPriority();
  95 }
  96
  97 void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
  98 {
  99     for (ImageResourceMap::iterator it = m_imageResources.begin(); it != m_imageResources.end(); ++it) {
 100         ResourceLoadPriority priority = it->value->status == Visible ?
 101             ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
 102
 103         if (priority != it->value->imageResource->resourceRequest().priority()) {
 104             it->value->imageResource->resourceRequest().setPriority(priority, it->value->screenArea);
 105             it->value->imageResource->didChangePriority(priority, it->value->screenArea);
 106         }
 107     }
 108     m_imageResources.clear();
 109 }
 110
 111 void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
 112 {
 113     if (!img || img->isLoaded())
 114         return;
 115
 116     int screenArea = 0;
 117     if (!screenRect.isEmpty() && status == Visible)
 118         screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
 119
 120     ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
 121     if (!result.isNewEntry && status == Visible) {
 122         result.storedValue->value->status = status;
 123         result.storedValue->value->screenArea = status;
 124     }
 125 }
 126
 127 }