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      1 /*
      2  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
      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 GraphicsContextPlatformPrivateCG_h
     27 #define GraphicsContextPlatformPrivateCG_h
     28 
     29 #include <wtf/RetainPtr.h>
     30 #include <CoreGraphics/CGContext.h>
     31 
     32 namespace WebCore {
     33 
     34 enum GraphicsContextCGFlag {
     35     IsLayerCGContext = 1 << 0,
     36     IsAcceleratedCGContext = 1 << 1
     37 };
     38 
     39 typedef unsigned GraphicsContextCGFlags;
     40 
     41 class GraphicsContextPlatformPrivate {
     42 public:
     43     GraphicsContextPlatformPrivate(CGContextRef cgContext, GraphicsContextCGFlags flags = 0)
     44         : m_cgContext(cgContext)
     45 #if PLATFORM(WIN)
     46         , m_hdc(0)
     47         , m_transparencyCount(0)
     48         , m_shouldIncludeChildWindows(false)
     49 #endif
     50         , m_userToDeviceTransformKnownToBeIdentity(false)
     51         , m_contextFlags(flags)
     52     {
     53     }
     54 
     55     ~GraphicsContextPlatformPrivate()
     56     {
     57     }
     58 
     59 #if PLATFORM(MAC) || PLATFORM(CHROMIUM)
     60     // These methods do nothing on Mac.
     61     void save() {}
     62     void restore() {}
     63     void flush() {}
     64     void clip(const FloatRect&) {}
     65     void clip(const Path&) {}
     66     void scale(const FloatSize&) {}
     67     void rotate(float) {}
     68     void translate(float, float) {}
     69     void concatCTM(const AffineTransform&) {}
     70     void setCTM(const AffineTransform&) {}
     71     void beginTransparencyLayer() {}
     72     void endTransparencyLayer() {}
     73 #endif
     74 
     75 #if PLATFORM(WIN)
     76     // On Windows, we need to update the HDC for form controls to draw in the right place.
     77     void save();
     78     void restore();
     79     void flush();
     80     void clip(const FloatRect&);
     81     void clip(const Path&);
     82     void scale(const FloatSize&);
     83     void rotate(float);
     84     void translate(float, float);
     85     void concatCTM(const AffineTransform&);
     86     void setCTM(const AffineTransform&);
     87     void beginTransparencyLayer() { m_transparencyCount++; }
     88     void endTransparencyLayer() { m_transparencyCount--; }
     89 
     90     HDC m_hdc;
     91     unsigned m_transparencyCount;
     92     bool m_shouldIncludeChildWindows;
     93 #endif
     94 
     95     RetainPtr<CGContextRef> m_cgContext;
     96     bool m_userToDeviceTransformKnownToBeIdentity;
     97     GraphicsContextCGFlags m_contextFlags;
     98 };
     99 
    100 }
    101 
    102 #endif // GraphicsContextPlatformPrivateCG_h
    103