Refactor the API for setting dynamic resource load priorities

Source/core/fetch/ResourceLoadPriorityOptimizer.cpp

Index: Source/core/fetch/ResourceLoadPriorityOptimizer.cpp
diff --git a/Source/core/fetch/ResourceLoadPriorityOptimizer.cpp b/Source/core/fetch/ResourceLoadPriorityOptimizer.cpp
deleted file mode 100644
index a787e1420242ffaf0035a7cdd9a4f163ce5e3135..0000000000000000000000000000000000000000
--- a/Source/core/fetch/ResourceLoadPriorityOptimizer.cpp
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/fetch/ResourceLoadPriorityOptimizer.h"
-
-#include "core/fetch/ResourceLoader.h"
-#include "core/layout/LayoutObject.h"
-#include "platform/TraceEvent.h"
-
-#include "wtf/Vector.h"
-
-namespace blink {
-
-ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
-{
-    DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
-    return &s_renderLoadOptimizer;
-}
-
-ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
-    : imageResource(image)
-    , status(visibilityStatus)
-    , screenArea(screenArea)
-{
-}
-
-ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
-{
-}
-
-ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
-{
-}
-
-ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
-{
-}
-
-void ResourceLoadPriorityOptimizer::addLayoutObject(LayoutObject* layoutObject)
-{
-    m_objects.add(layoutObject);
-    layoutObject->setHasPendingResourceUpdate(true);
-}
-
-void ResourceLoadPriorityOptimizer::removeLayoutObject(LayoutObject* layoutObject)
-{
-    if (!layoutObject->hasPendingResourceUpdate())
-        return;
-    m_objects.remove(layoutObject);
-    layoutObject->setHasPendingResourceUpdate(false);
-}
-
-void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
-{
-    TRACE_EVENT0("blink", "ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities");
-
-    m_imageResources.clear();
-
-    Vector<LayoutObject*> objectsToRemove;
-    for (const auto& layoutObject : m_objects) {
-        if (!layoutObject->updateImageLoadingPriorities())
-            objectsToRemove.append(layoutObject);
-    }
-    m_objects.removeAll(objectsToRemove);
-
-    updateImageResourcesWithLoadPriority();
-}
-
-void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
-{
-    for (const auto& resource : m_imageResources) {
-        ResourceLoadPriority priority = resource.value->status == Visible ?
-            ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
-
-        if (resource.value->imageResource->loader() && resource.value->imageResource->loader()->shouldUseIncreasedPriorities()) {
-            priority = resource.value->status == Visible ?
-                ResourceLoadPriorityHigh : ResourceLoadPriorityLow;
-        }
-
-        if (priority != resource.value->imageResource->resourceRequest().priority()) {
-            resource.value->imageResource->mutableResourceRequest().setPriority(priority, resource.value->screenArea);
-            resource.value->imageResource->didChangePriority(priority, resource.value->screenArea);
-        }
-    }
-    m_imageResources.clear();
-}
-
-void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status, const LayoutRect& screenRect)
-{
-    if (!img || img->isLoaded())
-        return;
-
-    int screenArea = 0;
-    if (!screenRect.isEmpty() && status == Visible)
-        screenArea += static_cast<uint32_t>(screenRect.width() * screenRect.height());
-
-    ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status, screenArea)));
-    if (!result.isNewEntry && status == Visible) {
-        result.storedValue->value->status = Visible;
-        result.storedValue->value->screenArea += screenArea;
-    }
-}
-
-}