1/*
2 * Copyright (C) 2011-2017 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "Filter.h"
29#include "IntRectExtent.h"
30#include "LayoutRect.h"
31#include <wtf/TypeCasts.h>
32
33namespace WebCore {
34
35class FilterEffect;
36class FilterOperations;
37class GraphicsContext;
38class ReferenceFilterOperation;
39class RenderElement;
40class SourceAlpha;
41class SourceGraphic;
42
43enum class FilterConsumer { FilterProperty, FilterFunction };
44
45class CSSFilter final : public Filter {
46 WTF_MAKE_FAST_ALLOCATED;
47 friend class RenderLayerFilters;
48public:
49 static Ref<CSSFilter> create();
50
51 void setSourceImageRect(const FloatRect&);
52 void setFilterRegion(const FloatRect& filterRegion) { m_filterRegion = filterRegion; }
53
54 ImageBuffer* output() const;
55
56 bool build(RenderElement&, const FilterOperations&, FilterConsumer);
57 void clearIntermediateResults();
58 void apply();
59
60 bool hasFilterThatMovesPixels() const { return m_hasFilterThatMovesPixels; }
61 bool hasFilterThatShouldBeRestrictedBySecurityOrigin() const { return m_hasFilterThatShouldBeRestrictedBySecurityOrigin; }
62
63 void determineFilterPrimitiveSubregion();
64
65private:
66 CSSFilter();
67 virtual ~CSSFilter();
68
69 bool isCSSFilter() const final { return true; }
70
71 FloatRect sourceImageRect() const final { return m_sourceDrawingRegion; }
72
73 FloatRect filterRegion() const final { return m_filterRegion; }
74 FloatRect filterRegionInUserSpace() const final { return m_filterRegion; }
75
76 RefPtr<FilterEffect> buildReferenceFilter(RenderElement&, FilterEffect& previousEffect, ReferenceFilterOperation&);
77
78 void setMaxEffectRects(const FloatRect&);
79
80 GraphicsContext* inputContext();
81
82 bool updateBackingStoreRect(const FloatRect& filterRect);
83 void allocateBackingStoreIfNeeded(const GraphicsContext&);
84
85 IntRect outputRect() const;
86
87 LayoutRect computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect);
88
89 FloatRect m_sourceDrawingRegion;
90 FloatRect m_filterRegion;
91
92 Vector<Ref<FilterEffect>> m_effects;
93 Ref<SourceGraphic> m_sourceGraphic;
94 RefPtr<FilterEffect> m_sourceAlpha;
95
96 IntRectExtent m_outsets;
97
98 bool m_graphicsBufferAttached { false };
99 bool m_hasFilterThatMovesPixels { false };
100 bool m_hasFilterThatShouldBeRestrictedBySecurityOrigin { false };
101};
102
103} // namespace WebCore
104
105SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CSSFilter)
106 static bool isType(const WebCore::Filter& filter) { return filter.isCSSFilter(); }
107SPECIALIZE_TYPE_TRAITS_END()
108