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 /*

  * Copyright 2006 The Android Open Source Project

  *

  * Use of this source code is governed by a BSD-style license that can be

  * found in the LICENSE file.

  */

 #ifndef SkPerspIter_DEFINED

 #define SkPerspIter_DEFINED

 #include "SkMatrix.h"

 class SkPerspIter {

 public:

     /** Iterate a line through the matrix [x,y] ... [x+count-1, y].

         @param m    The matrix we will be iterating a line through

         @param x    The initial X coordinate to be mapped through the matrix

         @param y    The initial Y coordinate to be mapped through the matrix

         @param count The number of points (x,y) (x+1,y) (x+2,y) ... we will eventually map

     */

     SkPerspIter(const SkMatrix& m, SkScalar x, SkScalar y, int count);

     /** Return the buffer of [x,y] fixed point values we will be filling.

         This always returns the same value, so it can be saved across calls to

         next().

     */

     const SkFixed* getXY() const { return fStorage; }

     /** Return the number of [x,y] pairs that have been filled in the getXY() buffer.

         When this returns 0, the iterator is finished.

     */

     int next();

 private:

     enum {

         kShift  = 4,

         kCount  = (1 << kShift)

     };

     const SkMatrix& fMatrix;

     SkFixed         fStorage[kCount * 2];

     SkFixed         fX, fY;

     SkScalar        fSX, fSY;

     int             fCount;

 };

 #endif