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      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 COMPUTER, 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 COMPUTER, 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 "ContextShadow.h"
     30 #include "RefPtrCairo.h"
     31 
     32 namespace WebCore {
     33 
     34 // In Cairo image masking is immediate, so to emulate image clipping we must save masking
     35 // details as part of the context state and apply them during platform restore.
     36 class ImageMaskInformation {
     37 public:
     38     void update(cairo_surface_t* maskSurface, const FloatRect& maskRect)
     39     {
     40         m_maskSurface = maskSurface;
     41         m_maskRect = maskRect;
     42     }
     43 
     44     bool isValid() const { return m_maskSurface; }
     45     cairo_surface_t* maskSurface() const { return m_maskSurface.get(); }
     46     const FloatRect& maskRect() const { return m_maskRect; }
     47 
     48 private:
     49     RefPtr<cairo_surface_t> m_maskSurface;
     50     FloatRect m_maskRect;
     51 };
     52 
     53 // Much like PlatformContextSkia in the Skia port, this class holds information that
     54 // would normally be private to GraphicsContext, except that we want to allow access
     55 // to it in Font and Image code. This allows us to separate the concerns of Cairo-specific
     56 // code from the platform-independent GraphicsContext.
     57 
     58 class PlatformContextCairo {
     59     WTF_MAKE_NONCOPYABLE(PlatformContextCairo);
     60 public:
     61     PlatformContextCairo(cairo_t*);
     62 
     63     cairo_t* cr() { return m_cr.get(); }
     64     void setCr(cairo_t* cr) { m_cr = cr; }
     65 
     66     void save();
     67     void restore();
     68     void pushImageMask(cairo_surface_t*, const FloatRect&);
     69 
     70 private:
     71     RefPtr<cairo_t> m_cr;
     72     Vector<ImageMaskInformation> m_maskImageStack;
     73 };
     74 
     75 } // namespace WebCore
     76 
     77 #endif // PlatformContextCairo_h
     78