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      1 /*
      2  * Copyright 2012, The Android Open Source Project
      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  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 PicturePile_h
     27 #define PicturePile_h
     28 
     29 #include "IntRect.h"
     30 #include "IntSize.h"
     31 #include "PrerenderedInval.h"
     32 #include "SkBitmap.h"
     33 #include "SkRegion.h"
     34 #include "SkRefCnt.h"
     35 
     36 #include <wtf/PassRefPtr.h>
     37 #include <wtf/RefCounted.h>
     38 #include <wtf/ThreadSafeRefCounted.h>
     39 #include <wtf/Vector.h>
     40 
     41 class SkPicture;
     42 class SkCanvas;
     43 
     44 namespace WebCore {
     45 
     46 class GraphicsContext;
     47 
     48 class PicturePainter {
     49 public:
     50     virtual void paintContents(GraphicsContext* gc, IntRect& dirty) = 0;
     51     virtual SkCanvas* createPrerenderCanvas(PrerenderedInval* prerendered)
     52     {
     53         return 0;
     54     }
     55     virtual ~PicturePainter() {}
     56 };
     57 
     58 class PictureContainer {
     59 public:
     60     SkPicture* picture;
     61     IntRect area;
     62     bool dirty;
     63     RefPtr<PrerenderedInval> prerendered;
     64 
     65     PictureContainer(const IntRect& area)
     66         : picture(0)
     67         , area(area)
     68         , dirty(true)
     69     {}
     70 
     71     PictureContainer(const PictureContainer& other)
     72         : picture(other.picture)
     73         , area(other.area)
     74         , dirty(other.dirty)
     75         , prerendered(other.prerendered)
     76     {
     77         SkSafeRef(picture);
     78     }
     79 
     80     ~PictureContainer()
     81     {
     82         SkSafeUnref(picture);
     83     }
     84 };
     85 
     86 class PicturePile {
     87 public:
     88     PicturePile() {}
     89     PicturePile(const PicturePile& other);
     90     PicturePile(SkPicture* picture);
     91 
     92     const IntSize& size() { return m_size; }
     93 
     94     void clearPrerenders();
     95 
     96     // used by PicturePileLayerContents
     97     void draw(SkCanvas* canvas);
     98 
     99     // Used by WebViewCore
    100     void invalidate(const IntRect& dirtyRect);
    101     void setSize(const IntSize& size);
    102     void updatePicturesIfNeeded(PicturePainter* painter);
    103     void reset();
    104     SkRegion& dirtyRegion() { return m_dirtyRegion; }
    105     PrerenderedInval* prerenderedInvalForArea(const IntRect& area);
    106 
    107 private:
    108     void applyWebkitInvals();
    109     void updatePicture(PicturePainter* painter, PictureContainer& container);
    110     void appendToPile(const IntRect& inval, const IntRect& originalInval = IntRect());
    111     void drawWithClipRecursive(SkCanvas* canvas, SkRegion& clipRegion, int index);
    112 
    113     IntSize m_size;
    114     Vector<PictureContainer> m_pile;
    115     Vector<IntRect> m_webkitInvals;
    116     SkRegion m_dirtyRegion;
    117 };
    118 
    119 } // namespace android
    120 
    121 #endif // PicturePile_h
    122