1/*
2 * Copyright (C) 2012 Adobe Systems Incorporated. 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
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above
9 *    copyright notice, this list of conditions and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials
14 *    provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include "config.h"
31
32#include "core/rendering/RenderLayerFilterInfo.h"
33
34#include "core/fetch/DocumentResourceReference.h"
35#include "core/rendering/FilterEffectRenderer.h"
36#include "core/rendering/RenderLayer.h"
37#include "core/rendering/svg/ReferenceFilterBuilder.h"
38#include "core/rendering/svg/RenderSVGResourceContainer.h"
39#include "core/svg/SVGFilterElement.h"
40#include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
41#include "core/svg/graphics/filters/SVGFilter.h"
42
43namespace blink {
44
45RenderLayerFilterInfoMap* RenderLayerFilterInfo::s_filterMap = 0;
46
47RenderLayerFilterInfo* RenderLayerFilterInfo::filterInfoForRenderLayer(const RenderLayer* layer)
48{
49    if (!s_filterMap)
50        return 0;
51    RenderLayerFilterInfoMap::iterator iter = s_filterMap->find(layer);
52    return (iter != s_filterMap->end()) ? iter->value : 0;
53}
54
55RenderLayerFilterInfo* RenderLayerFilterInfo::createFilterInfoForRenderLayerIfNeeded(RenderLayer* layer)
56{
57    if (!s_filterMap)
58        s_filterMap = new RenderLayerFilterInfoMap();
59
60    RenderLayerFilterInfoMap::iterator iter = s_filterMap->find(layer);
61    if (iter != s_filterMap->end()) {
62        ASSERT(layer->hasFilterInfo());
63        return iter->value;
64    }
65
66    RenderLayerFilterInfo* filter = new RenderLayerFilterInfo(layer);
67    s_filterMap->set(layer, filter);
68    layer->setHasFilterInfo(true);
69    return filter;
70}
71
72void RenderLayerFilterInfo::removeFilterInfoForRenderLayer(RenderLayer* layer)
73{
74    if (!s_filterMap)
75        return;
76    RenderLayerFilterInfo* filter = s_filterMap->take(layer);
77    if (s_filterMap->isEmpty()) {
78        delete s_filterMap;
79        s_filterMap = 0;
80    }
81    if (!filter) {
82        ASSERT(!layer->hasFilterInfo());
83        return;
84    }
85    layer->setHasFilterInfo(false);
86    delete filter;
87}
88
89RenderLayerFilterInfo::RenderLayerFilterInfo(RenderLayer* layer)
90    : m_layer(layer)
91{
92}
93
94RenderLayerFilterInfo::~RenderLayerFilterInfo()
95{
96    removeReferenceFilterClients();
97}
98
99void RenderLayerFilterInfo::setRenderer(PassRefPtr<FilterEffectRenderer> renderer)
100{
101    m_renderer = renderer;
102}
103
104void RenderLayerFilterInfo::notifyFinished(Resource*)
105{
106    RenderObject* renderer = m_layer->renderer();
107    // FIXME: This caller of scheduleSVGFilterLayerUpdateHack() is not correct. It's using the layer update
108    // system to trigger a RenderLayer to go through the filter updating logic, but that might not
109    // even happen if this element is style sharing and RenderObject::setStyle() returns early.
110    // Filters need to find a better way to hook into the system.
111    toElement(renderer->node())->scheduleSVGFilterLayerUpdateHack();
112    renderer->setShouldDoFullPaintInvalidation(true);
113}
114
115void RenderLayerFilterInfo::updateReferenceFilterClients(const FilterOperations& operations)
116{
117    removeReferenceFilterClients();
118    for (size_t i = 0; i < operations.size(); ++i) {
119        RefPtr<FilterOperation> filterOperation = operations.operations().at(i);
120        if (filterOperation->type() != FilterOperation::REFERENCE)
121            continue;
122        ReferenceFilterOperation* referenceFilterOperation = toReferenceFilterOperation(filterOperation.get());
123        DocumentResourceReference* documentReference = ReferenceFilterBuilder::documentResourceReference(referenceFilterOperation);
124        DocumentResource* cachedSVGDocument = documentReference ? documentReference->document() : 0;
125
126        if (cachedSVGDocument) {
127            // Reference is external; wait for notifyFinished().
128            cachedSVGDocument->addClient(this);
129            m_externalSVGReferences.append(cachedSVGDocument);
130        } else {
131            // Reference is internal; add layer as a client so we can trigger
132            // filter paint invalidation on SVG attribute change.
133            Element* filter = m_layer->renderer()->node()->document().getElementById(referenceFilterOperation->fragment());
134            if (!isSVGFilterElement(filter))
135                continue;
136            if (filter->renderer())
137                toRenderSVGResourceContainer(filter->renderer())->addClientRenderLayer(m_layer);
138            else
139                toSVGFilterElement(filter)->addClient(m_layer->renderer()->node());
140            m_internalSVGReferences.append(filter);
141        }
142    }
143}
144
145void RenderLayerFilterInfo::removeReferenceFilterClients()
146{
147    for (size_t i = 0; i < m_externalSVGReferences.size(); ++i)
148        m_externalSVGReferences.at(i)->removeClient(this);
149    m_externalSVGReferences.clear();
150    for (size_t i = 0; i < m_internalSVGReferences.size(); ++i) {
151        Element* filter = m_internalSVGReferences.at(i).get();
152        if (filter->renderer())
153            toRenderSVGResourceContainer(filter->renderer())->removeClientRenderLayer(m_layer);
154        else
155            toSVGFilterElement(filter)->removeClient(m_layer->renderer()->node());
156    }
157    m_internalSVGReferences.clear();
158}
159
160} // namespace blink
161
162