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      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 class SK_API 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. Optional parameters
     34      *  isFixedColor and fixedColor specify if the rectangle is filled with a fixed color.
     35      *  If (*isFixedColor) is true, then (*fixedColor) contains the rectangle color.
     36      */
     37     bool next(SkIRect* src, SkRect* dst, bool* isFixedColor = nullptr,
     38               SkColor* fixedColor = nullptr);
     39 
     40     /** Version of above that converts the integer src rect to a scalar rect. */
     41     bool next(SkRect* src, SkRect* dst, bool* isFixedColor = nullptr,
     42               SkColor* fixedColor = nullptr) {
     43         SkIRect isrcR;
     44         if (this->next(&isrcR, dst, isFixedColor, fixedColor)) {
     45             *src = SkRect::Make(isrcR);
     46             return true;
     47         }
     48         return false;
     49     }
     50 
     51     /**
     52      *  Apply a matrix to the dst points.
     53      */
     54     void mapDstScaleTranslate(const SkMatrix& matrix);
     55 
     56     /**
     57      *  Returns the number of rects that will actually be drawn.
     58      */
     59     int numRectsToDraw() const {
     60         return fNumRectsToDraw;
     61     }
     62 
     63 private:
     64     SkTArray<int> fSrcX;
     65     SkTArray<int> fSrcY;
     66     SkTArray<SkScalar> fDstX;
     67     SkTArray<SkScalar> fDstY;
     68     SkTArray<SkCanvas::Lattice::RectType> fRectTypes;
     69     SkTArray<SkColor> fColors;
     70 
     71     int  fCurrX;
     72     int  fCurrY;
     73     int  fNumRectsInLattice;
     74     int  fNumRectsToDraw;
     75 };
     76 
     77 #endif
     78