1/*
2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
3 * Copyright (C) 2013 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above
10 *    copyright notice, this list of conditions and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above
13 *    copyright notice, this list of conditions and the following
14 *    disclaimer in the documentation and/or other materials
15 *    provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include "config.h"
32
33#if ENABLE(CSS_FILTERS)
34#include "RenderLayerFilterInfo.h"
35
36#include "CachedSVGDocument.h"
37#include "CachedSVGDocumentReference.h"
38#include "FilterEffectRenderer.h"
39#include "SVGElement.h"
40#include "SVGFilter.h"
41#include "SVGFilterPrimitiveStandardAttributes.h"
42#include <wtf/NeverDestroyed.h>
43
44namespace WebCore {
45
46HashMap<const RenderLayer*, std::unique_ptr<RenderLayer::FilterInfo>>& RenderLayer::FilterInfo::map()
47{
48    static NeverDestroyed<HashMap<const RenderLayer*, std::unique_ptr<FilterInfo>>> map;
49    return map;
50}
51
52RenderLayer::FilterInfo* RenderLayer::FilterInfo::getIfExists(const RenderLayer& layer)
53{
54    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));
55
56    return layer.m_hasFilterInfo ? map().get(&layer) : 0;
57}
58
59RenderLayer::FilterInfo& RenderLayer::FilterInfo::get(RenderLayer& layer)
60{
61    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));
62
63    auto& info = map().add(&layer, nullptr).iterator->value;
64    if (!info) {
65        info = std::make_unique<FilterInfo>(layer);
66        layer.m_hasFilterInfo = true;
67    }
68    return *info;
69}
70
71void RenderLayer::FilterInfo::remove(RenderLayer& layer)
72{
73    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));
74
75    if (map().remove(&layer))
76        layer.m_hasFilterInfo = false;
77}
78
79RenderLayer::FilterInfo::FilterInfo(RenderLayer& layer)
80    : m_layer(layer)
81{
82}
83
84RenderLayer::FilterInfo::~FilterInfo()
85{
86    removeReferenceFilterClients();
87}
88
89void RenderLayer::FilterInfo::setRenderer(PassRefPtr<FilterEffectRenderer> renderer)
90{
91    m_renderer = renderer;
92}
93
94void RenderLayer::FilterInfo::notifyFinished(CachedResource*)
95{
96    m_layer.filterNeedsRepaint();
97}
98
99void RenderLayer::FilterInfo::updateReferenceFilterClients(const FilterOperations& operations)
100{
101    removeReferenceFilterClients();
102    for (size_t i = 0, size = operations.size(); i < size; ++i) {
103        FilterOperation* filterOperation = operations.operations()[i].get();
104        if (filterOperation->type() != FilterOperation::REFERENCE)
105            continue;
106        ReferenceFilterOperation* referenceFilterOperation = toReferenceFilterOperation(filterOperation);
107        CachedSVGDocumentReference* documentReference = referenceFilterOperation->cachedSVGDocumentReference();
108        CachedSVGDocument* cachedSVGDocument = documentReference ? documentReference->document() : 0;
109
110        if (cachedSVGDocument) {
111            // Reference is external; wait for notifyFinished().
112            cachedSVGDocument->addClient(this);
113            m_externalSVGReferences.append(cachedSVGDocument);
114        } else {
115            // Reference is internal; add layer as a client so we can trigger
116            // filter repaint on SVG attribute change.
117            Element* filter = m_layer.renderer().document().getElementById(referenceFilterOperation->fragment());
118
119            if (!filter || !filter->renderer() || !filter->renderer()->isSVGResourceFilter())
120                continue;
121            toRenderSVGResourceContainer(*filter->renderer()).addClientRenderLayer(&m_layer);
122            m_internalSVGReferences.append(filter);
123        }
124    }
125}
126
127void RenderLayer::FilterInfo::removeReferenceFilterClients()
128{
129    for (size_t i = 0, size = m_externalSVGReferences.size(); i < size; ++i)
130        m_externalSVGReferences[i]->removeClient(this);
131    m_externalSVGReferences.clear();
132    for (size_t i = 0, size = m_internalSVGReferences.size(); i < size; ++i) {
133        Element* filter = m_internalSVGReferences[i].get();
134        if (!filter->renderer())
135            continue;
136        toRenderSVGResourceContainer(*filter->renderer()).removeClientRenderLayer(&m_layer);
137    }
138    m_internalSVGReferences.clear();
139}
140
141} // namespace WebCore
142
143#endif // ENABLE(CSS_FILTERS)
144