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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  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  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/rendering/RenderObject.h"
  34
  35 #include "wtf/Vector.h"
  36
  37 namespace WebCore {
  38
  39 ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
  40 {
  41     DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
  42     return &s_renderLoadOptimizer;
  43 }
  44
  45 ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
  46     : imageResource(image)
  47     , status(visibilityStatus)
  48     , screenArea(screenArea)
  49 {
  50 }
  51
  52 ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
  53 {
  54 }
  55
  56 ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
  57 {
  58 }
  59
  60 ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
  61 {
  62 }
  63
  64 void ResourceLoadPriorityOptimizer::addRenderObject(RenderObject* renderer)
  65 {
  66     m_objects.add(renderer);
  67     renderer->setHasPendingResourceUpdate(true);
  68 }
  69
  70 void ResourceLoadPriorityOptimizer::removeRenderObject(RenderObject* renderer)
  71 {
  72     if (!renderer->hasPendingResourceUpdate())
  73         return;
  74     m_objects.remove(renderer);
  75     renderer->setHasPendingResourceUpdate(false);
  76 }
  77
  78 void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
  79 {
  80     m_imageResources.clear();
  81
  82     Vector<RenderObject*> objectsToRemove;
  83     for (RenderObjectSet::iterator it = m_objects.begin(); it != m_objects.end(); ++it) {
  84         RenderObject* obj = *it;
  85         if (!obj->updateImageLoadingPriorities()) {
  86             objectsToRemove.append(obj);
  87         }
  88     }
  89     m_objects.removeAll(objectsToRemove);
  90
  91     updateImageResourcesWithLoadPriority();
  92 }
  93
  94 void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
  95 {
  96     for (ImageResourceMap::iterator it = m_imageResources.begin(); it != m_imageResources.end(); ++it) {
  97         ResourceLoadPriority priority = it->value->status == Visible ?
  98             ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
  99
 100         if (priority != it->value->imageResource->resourceRequest().priority()) {
 101             it->value->imageResource->resourceRequest().setPriority(priority, it->value->screenArea);
 102             it->value->imageResource->didChangePriority(priority, it->value->screenArea);
 103         }
 104     }
 105     m_imageResources.clear();
 106 }
 107
 108 void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
 109 {
 110     if (!img || img->isLoaded())
 111         return;
 112
 113     int screenArea = 0;
 114     if (!screenRect.isEmpty() && status == Visible)
 115         screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
 116
 117     ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
 118     if (!result.isNewEntry && status == Visible) {
 119         result.storedValue->value->status = status;
 120         result.storedValue->value->screenArea = status;
 121     }
 122 }
 123
 124 }