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#ifndef ShadowBlur_h 30#define ShadowBlur_h 31 32#include "Color.h" 33#include "ColorSpace.h" 34#include "FloatRect.h" 35#include "FloatRoundedRect.h" 36#include <wtf/Noncopyable.h> 37 38namespace WebCore { 39 40class AffineTransform; 41class GraphicsContext; 42struct GraphicsContextState; 43class ImageBuffer; 44 45class ShadowBlur { 46 WTF_MAKE_NONCOPYABLE(ShadowBlur); 47public: 48 enum ShadowType { 49 NoShadow, 50 SolidShadow, 51 BlurShadow 52 }; 53 54 ShadowBlur(const FloatSize& radius, const FloatSize& offset, const Color&, ColorSpace); 55 ShadowBlur(const GraphicsContextState&); 56 ShadowBlur(); 57 58 void setShadowValues(const FloatSize&, const FloatSize& , const Color&, ColorSpace, bool ignoreTransforms = false); 59 60 void setShadowsIgnoreTransforms(bool ignoreTransforms) { m_shadowsIgnoreTransforms = ignoreTransforms; } 61 bool shadowsIgnoreTransforms() const { return m_shadowsIgnoreTransforms; } 62 63 GraphicsContext* beginShadowLayer(GraphicsContext*, const FloatRect& layerArea); 64 void endShadowLayer(GraphicsContext*); 65 66 void drawRectShadow(GraphicsContext*, const FloatRoundedRect&); 67 void drawInsetShadow(GraphicsContext*, const FloatRect&, const FloatRoundedRect& holeRect); 68 69 void blurLayerImage(unsigned char*, const IntSize&, int stride); 70 71 void clear(); 72 73 ShadowType type() const { return m_type; } 74 75private: 76 void updateShadowBlurValues(); 77 78 void drawShadowBuffer(GraphicsContext*); 79 80 void adjustBlurRadius(GraphicsContext*); 81 82 enum ShadowDirection { 83 OuterShadow, 84 InnerShadow 85 }; 86 87 IntRect calculateLayerBoundingRect(GraphicsContext*, const FloatRect& layerArea, const IntRect& clipRect); 88 IntSize templateSize(const IntSize& blurredEdgeSize, const FloatRoundedRect::Radii&) const; 89 90 void drawRectShadowWithoutTiling(GraphicsContext*, const FloatRoundedRect&, const IntRect& layerRect); 91 void drawRectShadowWithTiling(GraphicsContext*, const FloatRoundedRect&, const IntSize& shadowTemplateSize, const IntSize& blurredEdgeSize); 92 93 void drawInsetShadowWithoutTiling(GraphicsContext*, const FloatRect&, const FloatRoundedRect& holeRect, const IntRect& layerRect); 94 void drawInsetShadowWithTiling(GraphicsContext*, const FloatRect&, const FloatRoundedRect& holeRect, const IntSize& shadowTemplateSize, const IntSize& blurredEdgeSize); 95 96 void drawLayerPieces(GraphicsContext*, const FloatRect& shadowBounds, const FloatRoundedRect::Radii&, const IntSize& roundedRadius, const IntSize& templateSize, ShadowDirection); 97 98 void blurShadowBuffer(const IntSize& templateSize); 99 void blurAndColorShadowBuffer(const IntSize& templateSize); 100 101 IntSize blurredEdgeSize() const; 102 103 104 ShadowType m_type; 105 106 Color m_color; 107 ColorSpace m_colorSpace; 108 FloatSize m_blurRadius; 109 FloatSize m_offset; 110 111 ImageBuffer* m_layerImage; // Buffer to where the temporary shadow will be drawn to. 112 113 FloatRect m_sourceRect; // Sub-rect of m_layerImage that contains the shadow pixels. 114 FloatPoint m_layerOrigin; // Top-left corner of the (possibly clipped) bounding rect to draw the shadow to. 115 FloatSize m_layerSize; // Size of m_layerImage pixels that need blurring. 116 FloatSize m_layerContextTranslation; // Translation to apply to m_layerContext for the shadow to be correctly clipped. 117 118 bool m_shadowsIgnoreTransforms; 119}; 120 121} // namespace WebCore 122 123#endif // ShadowBlur_h 124