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/rendering/RenderObject.h"
34 #include "platform/TraceEvent.h"
35
36 #include "wtf/Vector.h"
37
38 namespace blink {
39
resourceLoadPriorityOptimizer()40 ResourceLoadPriorityOptimizer* ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()
41 {
42 DEFINE_STATIC_LOCAL(ResourceLoadPriorityOptimizer, s_renderLoadOptimizer, ());
43 return &s_renderLoadOptimizer;
44 }
45
ResourceAndVisibility(ImageResource * image,VisibilityStatus visibilityStatus,uint32_t screenArea)46 ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus visibilityStatus, uint32_t screenArea)
47 : imageResource(image)
48 , status(visibilityStatus)
49 , screenArea(screenArea)
50 {
51 }
52
~ResourceAndVisibility()53 ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
54 {
55 }
56
ResourceLoadPriorityOptimizer()57 ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
58 {
59 }
60
~ResourceLoadPriorityOptimizer()61 ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
62 {
63 }
64
addRenderObject(RenderObject * renderer)65 void ResourceLoadPriorityOptimizer::addRenderObject(RenderObject* renderer)
66 {
67 m_objects.add(renderer);
68 renderer->setHasPendingResourceUpdate(true);
69 }
70
removeRenderObject(RenderObject * renderer)71 void ResourceLoadPriorityOptimizer::removeRenderObject(RenderObject* renderer)
72 {
73 if (!renderer->hasPendingResourceUpdate())
74 return;
75 m_objects.remove(renderer);
76 renderer->setHasPendingResourceUpdate(false);
77 }
78
updateAllImageResourcePriorities()79 void ResourceLoadPriorityOptimizer::updateAllImageResourcePriorities()
80 {
81 TRACE_EVENT0("blink", "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
updateImageResourcesWithLoadPriority()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->mutableResourceRequest().setPriority(priority, it->value->screenArea);
105 it->value->imageResource->didChangePriority(priority, it->value->screenArea);
106 }
107 }
108 m_imageResources.clear();
109 }
110
notifyImageResourceVisibility(ImageResource * img,VisibilityStatus status,const LayoutRect & screenRect)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 }
128