1 /* 2 * Copyright (C) 2010 Sencha, Inc. 3 * Copyright (C) 2010 Igalia S.L. 4 * 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 COMPUTER, 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 COMPUTER, 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 ContextShadow_h 30 #define ContextShadow_h 31 32 #include "Color.h" 33 #include "FloatRect.h" 34 #include "IntRect.h" 35 #include <wtf/RefCounted.h> 36 37 #if USE(CAIRO) 38 typedef struct _cairo cairo_t; 39 typedef struct _cairo_surface cairo_surface_t; 40 #elif PLATFORM(QT) 41 #include <QImage> 42 QT_BEGIN_NAMESPACE 43 class QPainter; 44 QT_END_NAMESPACE 45 #endif 46 47 namespace WebCore { 48 49 class AffineTransform; 50 class GraphicsContext; 51 52 #if USE(CAIRO) 53 typedef cairo_surface_t* PlatformImage; 54 typedef cairo_t* PlatformContext; 55 #elif PLATFORM(QT) 56 typedef QImage PlatformImage; 57 typedef QPainter* PlatformContext; 58 #else 59 typedef void* PlatformImage; 60 typedef void* PlatformContext; 61 #endif 62 63 // This is to track and keep the shadow state. We use this rather than 64 // using GraphicsContextState to allow possible optimizations (right now 65 // only to determine the shadow type, but in future it might covers things 66 // like cached scratch image, persistent shader, etc). 67 68 // This class should be copyable since GraphicsContextQt keeps a stack of 69 // the shadow state for savePlatformState and restorePlatformState. 70 71 // This class is Deprecated. Platforms should migrate to ShadowBlur. 72 73 class ContextShadow { 74 public: 75 enum { 76 NoShadow, 77 SolidShadow, 78 BlurShadow 79 } m_type; 80 81 Color m_color; 82 int m_blurDistance; 83 FloatSize m_offset; 84 85 ContextShadow(); 86 ContextShadow(const Color&, float radius, const FloatSize& offset); 87 88 bool mustUseContextShadow(GraphicsContext*); 89 void clear(); 90 91 // The pair beginShadowLayer and endShadowLayer creates a temporary image 92 // where the caller can draw onto, using the returned context. This context 93 // must be used only to draw between the call to beginShadowLayer and 94 // endShadowLayer. 95 // 96 // Note: multiple/nested shadow layers are NOT allowed. 97 // 98 // The current clip region will be used to optimize the size of the 99 // temporary image. Thus, the original context should not change any 100 // clipping until endShadowLayer. If the shadow will be completely outside 101 // the clipping region, beginShadowLayer will return 0. 102 // 103 // The returned context will have the transformation matrix and clipping 104 // properly initialized to start doing the painting (no need to account for 105 // the shadow offset), however it will not have the same render hints, pen, 106 // brush, etc as the passed context. This is intentional, usually shadows 107 // have different properties than the shapes which cast them. 108 // 109 // Once endShadowLayer is called, the temporary image will be drawn with the 110 // original context. If blur radius is specified, the shadow will be 111 // filtered first. 112 113 PlatformContext beginShadowLayer(GraphicsContext*, const FloatRect& layerArea); 114 void endShadowLayer(GraphicsContext*); 115 static void purgeScratchBuffer(); 116 117 void setShadowsIgnoreTransforms(bool enable) { m_shadowsIgnoreTransforms = enable; } 118 bool shadowsIgnoreTransforms() const { return m_shadowsIgnoreTransforms; } 119 #if USE(CAIRO) 120 void drawRectShadow(GraphicsContext* context, const IntRect& rect, const IntSize& topLeftRadius = IntSize(), const IntSize& topRightRadius = IntSize(), const IntSize& bottomLeftRadius = IntSize(), const IntSize& bottomRightRadius = IntSize()); 121 #endif 122 #if PLATFORM(QT) 123 QPointF offset() const { return QPointF(m_offset.width(), m_offset.height()); } 124 #endif 125 126 private: 127 PlatformImage m_layerImage; // Buffer to where the temporary shadow will be drawn to. 128 PlatformContext m_layerContext; // Context used to paint the shadow to the layer image. 129 FloatRect m_sourceRect; // Sub-rect of m_layerImage that contains the shadow pixels. 130 FloatPoint m_layerOrigin; // Top-left corner of the (possibly clipped) bounding rect to draw the shadow to. 131 FloatPoint m_layerContextTranslation; // Translation to apply to m_layerContext for the shadow to be correctly clipped. 132 bool m_shadowsIgnoreTransforms; 133 134 void adjustBlurDistance(GraphicsContext*); 135 void blurLayerImage(unsigned char*, const IntSize& imageSize, int stride); 136 IntRect calculateLayerBoundingRect(GraphicsContext*, const FloatRect& layerArea, const IntRect& clipRect); 137 138 #if USE(CAIRO) 139 void drawRectShadowWithoutTiling(GraphicsContext*, const IntRect& shadowRect, const IntSize& topLeftRadius, const IntSize& topRightRadius, const IntSize& bottomLeftRadius, const IntSize& bottomRightRadius, float alpha); 140 #endif 141 }; 142 143 } // namespace WebCore 144 145 #endif // ContextShadow_h 146
