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 namespace WebCore {
35
ResourceAndVisibility(ImageResource * image,VisibilityStatus v)36 ResourceLoadPriorityOptimizer::ResourceAndVisibility::ResourceAndVisibility(ImageResource* image, VisibilityStatus v)
37 : imageResource(image)
38 , status(v)
39 {
40 }
41
~ResourceAndVisibility()42 ResourceLoadPriorityOptimizer::ResourceAndVisibility::~ResourceAndVisibility()
43 {
44 }
45
ResourceLoadPriorityOptimizer()46 ResourceLoadPriorityOptimizer::ResourceLoadPriorityOptimizer()
47 {
48 }
49
~ResourceLoadPriorityOptimizer()50 ResourceLoadPriorityOptimizer::~ResourceLoadPriorityOptimizer()
51 {
52 updateImageResourcesWithLoadPriority();
53 }
54
updateImageResourcesWithLoadPriority()55 void ResourceLoadPriorityOptimizer::updateImageResourcesWithLoadPriority()
56 {
57 for (ImageResourceMap::iterator it = m_imageResources.begin(); it != m_imageResources.end(); ++it) {
58 ResourceLoadPriority priority = it->value->status == Visible ?
59 ResourceLoadPriorityLow : ResourceLoadPriorityVeryLow;
60
61 if (priority != it->value->imageResource->resourceRequest().priority()) {
62 it->value->imageResource->resourceRequest().setPriority(priority);
63 it->value->imageResource->didChangePriority(priority);
64 }
65 }
66 m_imageResources.clear();
67 }
68
notifyImageResourceVisibility(ImageResource * img,VisibilityStatus status)69 void ResourceLoadPriorityOptimizer::notifyImageResourceVisibility(ImageResource* img, VisibilityStatus status)
70 {
71 if (!img || img->isLoaded())
72 return;
73
74 ImageResourceMap::AddResult result = m_imageResources.add(img->identifier(), adoptPtr(new ResourceAndVisibility(img, status)));
75 if (!result.isNewEntry && status == Visible)
76 result.iterator->value->status = status;
77 }
78
79 }
80