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      1 /*
      2  * Copyright (C) 2011 Google 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef PlatformCanvas_h
     27 #define PlatformCanvas_h
     28 
     29 #include "IntSize.h"
     30 #include <stdint.h>
     31 #include <wtf/Noncopyable.h>
     32 #include <wtf/OwnPtr.h>
     33 
     34 #if USE(CG)
     35 #include <CoreGraphics/CGColorSpace.h>
     36 #include <CoreGraphics/CGContext.h>
     37 #include <wtf/OwnArrayPtr.h>
     38 #include <wtf/RetainPtr.h>
     39 #endif
     40 
     41 #if USE(SKIA)
     42 class SkBitmap;
     43 class SkCanvas;
     44 #endif
     45 
     46 namespace WebCore {
     47 
     48 class GraphicsContext;
     49 
     50 #if USE(SKIA)
     51 class PlatformContextSkia;
     52 #endif
     53 
     54 // A 2D buffer of pixels with an associated GraphicsContext.
     55 class PlatformCanvas {
     56     WTF_MAKE_NONCOPYABLE(PlatformCanvas);
     57 public:
     58     PlatformCanvas();
     59     ~PlatformCanvas();
     60 
     61     // Scoped lock class to get temporary access to this canvas's pixels.
     62     class AutoLocker {
     63         WTF_MAKE_NONCOPYABLE(AutoLocker);
     64     public:
     65         explicit AutoLocker(PlatformCanvas*);
     66         ~AutoLocker();
     67 
     68         const uint8_t* pixels() const { return m_pixels; }
     69     private:
     70         PlatformCanvas* m_canvas;
     71 #if USE(SKIA)
     72         const SkBitmap* m_bitmap;
     73 #endif
     74         uint8_t* m_pixels;
     75     };
     76 
     77     // Scoped lock class to get temporary access to paint into this canvas.
     78     class Painter {
     79         WTF_MAKE_NONCOPYABLE(Painter);
     80     public:
     81         enum TextOption { GrayscaleText, SubpixelText };
     82 
     83         Painter(PlatformCanvas*, TextOption);
     84         ~Painter();
     85 
     86         GraphicsContext* context() const { return m_context.get(); }
     87     private:
     88         OwnPtr<GraphicsContext> m_context;
     89 #if USE(SKIA)
     90         OwnPtr<PlatformContextSkia> m_skiaContext;
     91 #elif USE(CG)
     92         RetainPtr<CGColorSpaceRef> m_colorSpace;
     93         RetainPtr<CGContextRef> m_contextCG;
     94 #endif
     95     };
     96 
     97     void resize(const IntSize&);
     98     IntSize size() const { return m_size; }
     99 
    100 private:
    101 #if USE(SKIA)
    102     OwnPtr<SkCanvas> m_skiaCanvas;
    103 #elif USE(CG)
    104     OwnArrayPtr<uint8_t> m_pixelData;
    105 #endif
    106     IntSize m_size;
    107 };
    108 
    109 } // namespace WebCore
    110 
    111 #endif
    112