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| 1 /* | 1 /* |
| 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. | 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. |
| 3 * | 3 * |
| 4 * This library is free software; you can redistribute it and/or | 4 * This library is free software; you can redistribute it and/or |
| 5 * modify it under the terms of the GNU Library General Public | 5 * modify it under the terms of the GNU Library General Public |
| 6 * License as published by the Free Software Foundation; either | 6 * License as published by the Free Software Foundation; either |
| 7 * version 2 of the License, or (at your option) any later version. | 7 * version 2 of the License, or (at your option) any later version. |
| 8 * | 8 * |
| 9 * This library is distributed in the hope that it will be useful, | 9 * This library is distributed in the hope that it will be useful, |
| 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 26 #include "core/rendering/svg/RenderSVGResourceClipper.h" | 26 #include "core/rendering/svg/RenderSVGResourceClipper.h" |
| 27 #include "core/rendering/svg/RenderSVGResourceFilter.h" | 27 #include "core/rendering/svg/RenderSVGResourceFilter.h" |
| 28 #include "core/rendering/svg/RenderSVGResourceMarker.h" | 28 #include "core/rendering/svg/RenderSVGResourceMarker.h" |
| 29 #include "core/rendering/svg/RenderSVGResourceMasker.h" | 29 #include "core/rendering/svg/RenderSVGResourceMasker.h" |
| 30 #include "core/rendering/svg/RenderSVGResourcePaintServer.h" | 30 #include "core/rendering/svg/RenderSVGResourcePaintServer.h" |
| 31 #include "core/rendering/svg/SVGResources.h" | 31 #include "core/rendering/svg/SVGResources.h" |
| 32 #include "core/rendering/svg/SVGResourcesCache.h" | 32 #include "core/rendering/svg/SVGResourcesCache.h" |
| 33 | 33 |
| 34 namespace blink { | 34 namespace blink { |
| 35 | 35 |
| 36 SVGResourcesCycleSolver::SVGResourcesCycleSolver(RenderObject* renderer, SVGReso
urces* resources) | 36 SVGResourcesCycleSolver::SVGResourcesCycleSolver(LayoutObject* renderer, SVGReso
urces* resources) |
| 37 : m_renderer(renderer) | 37 : m_renderer(renderer) |
| 38 , m_resources(resources) | 38 , m_resources(resources) |
| 39 { | 39 { |
| 40 ASSERT(m_renderer); | 40 ASSERT(m_renderer); |
| 41 ASSERT(m_resources); | 41 ASSERT(m_resources); |
| 42 } | 42 } |
| 43 | 43 |
| 44 SVGResourcesCycleSolver::~SVGResourcesCycleSolver() | 44 SVGResourcesCycleSolver::~SVGResourcesCycleSolver() |
| 45 { | 45 { |
| 46 } | 46 } |
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| 65 | 65 |
| 66 bool SVGResourcesCycleSolver::resourceContainsCycles(RenderSVGResourceContainer*
resource) | 66 bool SVGResourcesCycleSolver::resourceContainsCycles(RenderSVGResourceContainer*
resource) |
| 67 { | 67 { |
| 68 // If we've traversed this sub-graph before and no cycles were observed, the
n | 68 // If we've traversed this sub-graph before and no cycles were observed, the
n |
| 69 // reuse that result. | 69 // reuse that result. |
| 70 if (m_dagCache.contains(resource)) | 70 if (m_dagCache.contains(resource)) |
| 71 return false; | 71 return false; |
| 72 | 72 |
| 73 ActiveFrame frame(m_activeResources, resource); | 73 ActiveFrame frame(m_activeResources, resource); |
| 74 | 74 |
| 75 RenderObject* node = resource; | 75 LayoutObject* node = resource; |
| 76 while (node) { | 76 while (node) { |
| 77 // Skip subtrees which are themselves resources. (They will be | 77 // Skip subtrees which are themselves resources. (They will be |
| 78 // processed - if needed - when they are actually referenced.) | 78 // processed - if needed - when they are actually referenced.) |
| 79 if (node != resource && node->isSVGResourceContainer()) { | 79 if (node != resource && node->isSVGResourceContainer()) { |
| 80 node = node->nextInPreOrderAfterChildren(resource); | 80 node = node->nextInPreOrderAfterChildren(resource); |
| 81 continue; | 81 continue; |
| 82 } | 82 } |
| 83 if (SVGResources* nodeResources = SVGResourcesCache::cachedResourcesForR
enderObject(node)) { | 83 if (SVGResources* nodeResources = SVGResourcesCache::cachedResourcesForL
ayoutObject(node)) { |
| 84 // Fetch all the resources referenced by |node|. | 84 // Fetch all the resources referenced by |node|. |
| 85 ResourceSet nodeSet; | 85 ResourceSet nodeSet; |
| 86 nodeResources->buildSetOfResources(nodeSet); | 86 nodeResources->buildSetOfResources(nodeSet); |
| 87 | 87 |
| 88 // Iterate resources referenced by |node|. | 88 // Iterate resources referenced by |node|. |
| 89 ResourceSet::iterator end = nodeSet.end(); | 89 ResourceSet::iterator end = nodeSet.end(); |
| 90 for (ResourceSet::iterator it = nodeSet.begin(); it != end; ++it) { | 90 for (ResourceSet::iterator it = nodeSet.begin(); it != end; ++it) { |
| 91 if (m_activeResources.contains(*it) || resourceContainsCycles(*i
t)) | 91 if (m_activeResources.contains(*it) || resourceContainsCycles(*i
t)) |
| 92 return true; | 92 return true; |
| 93 } | 93 } |
| 94 } | 94 } |
| 95 node = node->nextInPreOrder(resource); | 95 node = node->nextInPreOrder(resource); |
| 96 } | 96 } |
| 97 | 97 |
| 98 // No cycles found in (or from) this resource. Add it to the "DAG cache". | 98 // No cycles found in (or from) this resource. Add it to the "DAG cache". |
| 99 m_dagCache.add(resource); | 99 m_dagCache.add(resource); |
| 100 return false; | 100 return false; |
| 101 } | 101 } |
| 102 | 102 |
| 103 void SVGResourcesCycleSolver::resolveCycles() | 103 void SVGResourcesCycleSolver::resolveCycles() |
| 104 { | 104 { |
| 105 ASSERT(m_activeResources.isEmpty()); | 105 ASSERT(m_activeResources.isEmpty()); |
| 106 | 106 |
| 107 // If the starting RenderObject is a resource container itself, then add it | 107 // If the starting LayoutObject is a resource container itself, then add it |
| 108 // to the active set (to break direct self-references.) | 108 // to the active set (to break direct self-references.) |
| 109 if (m_renderer->isSVGResourceContainer()) | 109 if (m_renderer->isSVGResourceContainer()) |
| 110 m_activeResources.add(toRenderSVGResourceContainer(m_renderer)); | 110 m_activeResources.add(toRenderSVGResourceContainer(m_renderer)); |
| 111 | 111 |
| 112 ResourceSet localResources; | 112 ResourceSet localResources; |
| 113 m_resources->buildSetOfResources(localResources); | 113 m_resources->buildSetOfResources(localResources); |
| 114 | 114 |
| 115 // This performs a depth-first search for a back-edge in all the | 115 // This performs a depth-first search for a back-edge in all the |
| 116 // (potentially disjoint) graphs formed by the resources referenced by | 116 // (potentially disjoint) graphs formed by the resources referenced by |
| 117 // |m_renderer|. | 117 // |m_renderer|. |
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| 163 ASSERT(resourceLeadingToCycle == m_resources->clipper()); | 163 ASSERT(resourceLeadingToCycle == m_resources->clipper()); |
| 164 m_resources->resetClipper(); | 164 m_resources->resetClipper(); |
| 165 break; | 165 break; |
| 166 default: | 166 default: |
| 167 ASSERT_NOT_REACHED(); | 167 ASSERT_NOT_REACHED(); |
| 168 break; | 168 break; |
| 169 } | 169 } |
| 170 } | 170 } |
| 171 | 171 |
| 172 } | 172 } |
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