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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 Surface_h
     27 #define Surface_h
     28 
     29 #include "Color.h"
     30 #include "IntRect.h"
     31 #include "TilePainter.h"
     32 #include "Vector.h"
     33 
     34 class SkCanvas;
     35 class SkRegion;
     36 
     37 namespace WebCore {
     38 
     39 class Tile;
     40 class SurfaceBacking;
     41 class LayerAndroid;
     42 class TexturesResult;
     43 
     44 class Surface : public TilePainter {
     45 public:
     46     Surface();
     47     virtual ~Surface();
     48 
     49     bool tryUpdateSurface(Surface* oldSurface);
     50 
     51     void addLayer(LayerAndroid* layer, const TransformationMatrix& transform);
     52     void prepareGL(bool layerTilesDisabled, bool updateWithBlit);
     53     bool drawGL(bool layerTilesDisabled);
     54     void swapTiles(bool calculateFrameworkInvals);
     55     void addFrameworkInvals();
     56     bool isReady();
     57     bool isMissingContent();
     58     bool canUpdateWithBlit();
     59 
     60     void computeTexturesAmount(TexturesResult* result);
     61 
     62     LayerAndroid* getFirstLayer() const { return m_layers[0]; }
     63     bool needsTexture() { return m_needsTexture; }
     64     bool isBase();
     65 
     66     // don't allow transform fudging for merged layers - they need the transform
     67     // static at paint time, and are always aligned to 0,0 doc coordinates.
     68     bool allowTransformFudging() const { return singleLayer(); }
     69 
     70     // TilePainter methods
     71     virtual bool paint(SkCanvas* canvas);
     72     virtual float opacity();
     73     virtual Color* background();
     74     virtual bool blitFromContents(Tile* tile);
     75 
     76 private:
     77     IntRect computePrepareArea();
     78     IntRect visibleContentArea(bool force3dContentVisible = false) const;
     79     IntRect fullContentArea();
     80     bool singleLayer() const { return m_layers.size() == 1; }
     81     bool useAggressiveRendering();
     82 
     83     const TransformationMatrix* drawTransform();
     84     IntRect m_fullContentArea;
     85     TransformationMatrix m_drawTransform;
     86 
     87     SurfaceBacking* m_surfaceBacking;
     88     bool m_needsTexture;
     89     float m_maxZoomScale;
     90     Vector<LayerAndroid*> m_layers;
     91 
     92     Color m_background;
     93 };
     94 
     95 class LayerMergeState {
     96 public:
     97     LayerMergeState(Vector<Surface*>* const allGroups)
     98         : surfaceList(allGroups)
     99         , currentSurface(0)
    100         , nonMergeNestedLevel(0)
    101         , depth(0)
    102         {}
    103 
    104     // vector storing all generated layer groups
    105     Vector<Surface*>* const surfaceList;
    106 
    107     // currently merging group. if cleared, no more layers may join
    108     Surface* currentSurface;
    109 
    110     // records depth within non-mergeable parents (clipping, fixed, scrolling)
    111     // and disable merging therein.
    112     int nonMergeNestedLevel;
    113 
    114     // counts layer tree depth for debugging
    115     int depth;
    116 };
    117 
    118 } // namespace WebCore
    119 
    120 #endif //#define Surface_h
    121