Line data    Source code

       1             : /*
       2             :  * Copyright 2015 Google Inc.
       3             :  *
       4             :  * Use of this source code is governed by a BSD-style license that can be
       5             :  * found in the LICENSE file.
       6             :  */
       7             : 
       8             : #ifndef SkLatticeIter_DEFINED
       9             : #define SkLatticeIter_DEFINED
      10             : 
      11             : #include "SkCanvas.h"
      12             : #include "SkScalar.h"
      13             : #include "SkTArray.h"
      14             : 
      15             : struct SkIRect;
      16             : struct SkRect;
      17             : 
      18             : /**
      19             :  *  Disect a lattice request into an sequence of src-rect / dst-rect pairs
      20             :  */
      21           0 : class SkLatticeIter {
      22             : public:
      23             : 
      24             :     static bool Valid(int imageWidth, int imageHeight, const SkCanvas::Lattice& lattice);
      25             : 
      26             :     SkLatticeIter(const SkCanvas::Lattice& lattice, const SkRect& dst);
      27             : 
      28             :     static bool Valid(int imageWidth, int imageHeight, const SkIRect& center);
      29             : 
      30             :     SkLatticeIter(int imageWidth, int imageHeight, const SkIRect& center, const SkRect& dst);
      31             : 
      32             :     /**
      33             :      *  While it returns true, use src/dst to draw the image/bitmap
      34             :      */
      35             :     bool next(SkRect* src, SkRect* dst);
      36             : 
      37             :     /**
      38             :      *  Apply a matrix to the dst points.
      39             :      */
      40             :     void mapDstScaleTranslate(const SkMatrix& matrix);
      41             : 
      42             :     /**
      43             :      *  Returns the number of rects that will actually be drawn.
      44             :      */
      45           0 :     int numRectsToDraw() const {
      46           0 :         return fNumRectsToDraw;
      47             :     }
      48             : 
      49             : private:
      50             :     SkTArray<SkScalar> fSrcX;
      51             :     SkTArray<SkScalar> fSrcY;
      52             :     SkTArray<SkScalar> fDstX;
      53             :     SkTArray<SkScalar> fDstY;
      54             :     SkTArray<SkCanvas::Lattice::Flags> fFlags;
      55             : 
      56             :     int  fCurrX;
      57             :     int  fCurrY;
      58             :     int  fNumRectsInLattice;
      59             :     int  fNumRectsToDraw;
      60             : };
      61             : 
      62             : #endif