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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLatticeIter_DEFINED
#define SkLatticeIter_DEFINED
#include "SkCanvas.h"
#include "SkScalar.h"
#include "SkTArray.h"
struct SkIRect;
struct SkRect;
/**
* Disect a lattice request into an sequence of src-rect / dst-rect pairs
*/
class SkLatticeIter {
public:
static bool Valid(int imageWidth, int imageHeight, const SkCanvas::Lattice& lattice);
SkLatticeIter(int imageWidth, int imageHeight, const SkCanvas::Lattice& lattice,
const SkRect& dst);
static bool Valid(int imageWidth, int imageHeight, const SkIRect& center);
SkLatticeIter(int imageWidth, int imageHeight, const SkIRect& center, const SkRect& dst);
/**
* While it returns true, use src/dst to draw the image/bitmap
*/
bool next(SkRect* src, SkRect* dst);
/**
* Apply a matrix to the dst points.
*/
void mapDstScaleTranslate(const SkMatrix& matrix);
/**
* Returns the number of rects that will actually be drawn.
*/
int numRectsToDraw() const {
return fNumRectsToDraw;
}
private:
SkTArray<SkScalar> fSrcX;
SkTArray<SkScalar> fSrcY;
SkTArray<SkScalar> fDstX;
SkTArray<SkScalar> fDstY;
SkTArray<SkCanvas::Lattice::Flags> fFlags;
int fCurrX;
int fCurrY;
int fNumRectsInLattice;
int fNumRectsToDraw;
};
#endif
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