1/* 2 * Copyright (C) 2011 Igalia S.L. 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#ifndef PlatformContextCairo_h 27#define PlatformContextCairo_h 28 29#include "GraphicsContext.h" 30#include "RefPtrCairo.h" 31#include "ShadowBlur.h" 32 33namespace WebCore { 34 35struct GraphicsContextState; 36 37// Much like PlatformContextSkia in the Skia port, this class holds information that 38// would normally be private to GraphicsContext, except that we want to allow access 39// to it in Font and Image code. This allows us to separate the concerns of Cairo-specific 40// code from the platform-independent GraphicsContext. 41 42class PlatformContextCairo { 43 WTF_MAKE_NONCOPYABLE(PlatformContextCairo); 44public: 45 PlatformContextCairo(cairo_t*); 46 ~PlatformContextCairo(); 47 48 cairo_t* cr() { return m_cr.get(); } 49 void setCr(cairo_t* cr) { m_cr = cr; } 50 51 ShadowBlur& shadowBlur() { return m_shadowBlur; } 52 53 void save(); 54 void restore(); 55 void setGlobalAlpha(float); 56 float globalAlpha() const; 57 58 void pushImageMask(cairo_surface_t*, const FloatRect&); 59 void drawSurfaceToContext(cairo_surface_t*, const FloatRect& destRect, const FloatRect& srcRect, GraphicsContext*); 60 61 void setImageInterpolationQuality(InterpolationQuality); 62 InterpolationQuality imageInterpolationQuality() const; 63 64 enum PatternAdjustment { NoAdjustment, AdjustPatternForGlobalAlpha }; 65 void prepareForFilling(const GraphicsContextState&, PatternAdjustment); 66 67 enum AlphaPreservation { DoNotPreserveAlpha, PreserveAlpha }; 68 void prepareForStroking(const GraphicsContextState&, AlphaPreservation = PreserveAlpha); 69 70private: 71 void clipForPatternFilling(const GraphicsContextState&); 72 73 RefPtr<cairo_t> m_cr; 74 75 class State; 76 State* m_state; 77 WTF::Vector<State> m_stateStack; 78 79 // GraphicsContext is responsible for managing the state of the ShadowBlur, 80 // so it does not need to be on the state stack. 81 ShadowBlur m_shadowBlur; 82 83}; 84 85} // namespace WebCore 86 87#endif // PlatformContextCairo_h 88