1/*
2 * Copyright (C) 2011 Apple Inc.
3 * Copyright (C) 2010 Sencha, Inc.
4 * Copyright (C) 2010 Igalia S.L.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. OR
20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, 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 THEORY
24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#pragma once
30
31#include "Color.h"
32#include "FloatRect.h"
33#include "FloatRoundedRect.h"
34#include <wtf/Function.h>
35#include <wtf/Noncopyable.h>
36
37namespace WebCore {
38
39class AffineTransform;
40class GraphicsContext;
41struct GraphicsContextState;
42class ImageBuffer;
43
44class ShadowBlur {
45 WTF_MAKE_NONCOPYABLE(ShadowBlur);
46public:
47 enum ShadowType {
48 NoShadow,
49 SolidShadow,
50 BlurShadow
51 };
52
53 ShadowBlur();
54 ShadowBlur(const FloatSize& radius, const FloatSize& offset, const Color&, bool shadowsIgnoreTransforms = false);
55 ShadowBlur(const GraphicsContextState&);
56
57 void setShadowValues(const FloatSize&, const FloatSize& , const Color&, bool ignoreTransforms = false);
58
59 void setShadowsIgnoreTransforms(bool ignoreTransforms) { m_shadowsIgnoreTransforms = ignoreTransforms; }
60 bool shadowsIgnoreTransforms() const { return m_shadowsIgnoreTransforms; }
61
62 void drawRectShadow(GraphicsContext&, const FloatRoundedRect&);
63 void drawInsetShadow(GraphicsContext&, const FloatRect&, const FloatRoundedRect& holeRect);
64
65 using DrawBufferCallback = WTF::Function<void(ImageBuffer&, const FloatPoint&, const FloatSize&)>;
66 using DrawImageCallback = WTF::Function<void(ImageBuffer&, const FloatRect&, const FloatRect&)>;
67 using FillRectCallback = WTF::Function<void(const FloatRect&, const Color&)>;
68 using FillRectWithHoleCallback = WTF::Function<void(const FloatRect&, const FloatRect&, const Color&)>;
69 using DrawShadowCallback = WTF::Function<void(GraphicsContext&)>;
70
71 // DrawBufferCallback is for drawing shadow without tiling.
72 // DrawImageCallback and FillRectCallback is for drawing shadow with tiling.
73 void drawRectShadow(const AffineTransform&, const IntRect& clipBounds, const FloatRoundedRect& shadowedRect, const DrawBufferCallback&, const DrawImageCallback&, const FillRectCallback&);
74 void drawInsetShadow(const AffineTransform&, const IntRect& clipBounds, const FloatRect& fullRect, const FloatRoundedRect& holeRect, const DrawBufferCallback&, const DrawImageCallback&, const FillRectWithHoleCallback&);
75 void drawShadowLayer(const AffineTransform&, const IntRect& clipBounds, const FloatRect& layerArea, const DrawShadowCallback&, const DrawBufferCallback&);
76
77 void blurLayerImage(unsigned char*, const IntSize&, int stride);
78
79 void clear();
80
81 ShadowType type() const { return m_type; }
82
83private:
84 void updateShadowBlurValues();
85
86 void drawShadowBuffer(GraphicsContext&);
87
88 void adjustBlurRadius(const AffineTransform&);
89
90 enum ShadowDirection {
91 OuterShadow,
92 InnerShadow
93 };
94
95 IntSize calculateLayerBoundingRect(const AffineTransform&, const FloatRect& layerArea, const IntRect& clipRect);
96 IntSize templateSize(const IntSize& blurredEdgeSize, const FloatRoundedRect::Radii&) const;
97
98 void blurShadowBuffer(const IntSize& templateSize);
99 void blurAndColorShadowBuffer(const IntSize& templateSize);
100
101 void drawInsetShadowWithoutTiling(const AffineTransform&, const FloatRect& fullRect, const FloatRoundedRect& holeRect, const IntSize& layerSize, const DrawBufferCallback&);
102 void drawInsetShadowWithTiling(const AffineTransform&, const FloatRect& fullRect, const FloatRoundedRect& holeRect, const IntSize& shadowTemplateSize, const IntSize& blurredEdgeSize, const DrawImageCallback&, const FillRectWithHoleCallback&);
103
104 void drawRectShadowWithoutTiling(const AffineTransform&, const FloatRoundedRect& shadowedRect, const IntSize& layerSize, const DrawBufferCallback&);
105 void drawRectShadowWithTiling(const AffineTransform&, const FloatRoundedRect& shadowedRect, const IntSize& shadowTemplateSize, const IntSize& blurredEdgeSize, const DrawImageCallback&, const FillRectCallback&);
106
107 void drawLayerPiecesAndFillCenter(const FloatRect& shadowBounds, const FloatRoundedRect::Radii&, const IntSize& roundedRadius, const IntSize& templateSize, const DrawImageCallback&, const FillRectCallback&);
108 void drawLayerPieces(const FloatRect& shadowBounds, const FloatRoundedRect::Radii&, const IntSize& roundedRadius, const IntSize& templateSize, const DrawImageCallback&);
109
110 IntSize blurredEdgeSize() const;
111
112 ShadowType m_type { NoShadow };
113
114 Color m_color;
115 FloatSize m_blurRadius;
116 FloatSize m_offset;
117
118 ImageBuffer* m_layerImage { nullptr }; // Buffer to where the temporary shadow will be drawn to.
119
120 FloatSize m_shadowedResultSize; // Size of the result of shadowing which is same as shadowedRect + blurred edges.
121 FloatPoint m_layerOrigin; // Top-left corner of the (possibly clipped) bounding rect to draw the shadow to.
122 FloatSize m_layerSize; // Size of m_layerImage pixels that need blurring.
123 FloatSize m_layerContextTranslation; // Translation to apply to m_layerContext for the shadow to be correctly clipped.
124
125 bool m_shadowsIgnoreTransforms { false };
126};
127
128} // namespace WebCore
129