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 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 */ numRectsToDraw()45 int numRectsToDraw() const { 46 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 63