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 /*

  * Copyright 2011 Google Inc.

  *

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

  * found in the LICENSE file.

  */

 #ifndef SkBoundaryPatch_DEFINED

 #define SkBoundaryPatch_DEFINED

 #include "SkPoint.h"

 #include "SkRefCnt.h"

 class SkBoundary : public SkRefCnt {

 public:

     SK_DECLARE_INST_COUNT(SkBoundary)

     // These must be 0, 1, 2, 3 for efficiency in the subclass implementations

     enum Edge {

         kTop    = 0,

         kRight  = 1,

         kBottom = 2,

         kLeft   = 3

     };

     // Edge index goes clockwise around the boundary, beginning at the "top"

     virtual SkPoint eval(Edge, SkScalar unitInterval) = 0;

 private:

     typedef SkRefCnt INHERITED;

 };

 class SkBoundaryPatch {

 public:

     SkBoundaryPatch();

     ~SkBoundaryPatch();

     SkBoundary* getBoundary() const { return fBoundary; }

     SkBoundary* setBoundary(SkBoundary*);

     SkPoint eval(SkScalar unitU, SkScalar unitV);

     bool evalPatch(SkPoint verts[], int rows, int cols);

 private:

     SkBoundary* fBoundary;

 };

 ////////////////////////////////////////////////////////////////////////

 class SkLineBoundary : public SkBoundary {

 public:

     SkPoint fPts[4];

     // override

     virtual SkPoint eval(Edge, SkScalar);

 };

 class SkCubicBoundary : public SkBoundary {

 public:

     // the caller sets the first 12 entries. The 13th is used by the impl.

     SkPoint fPts[13];

     // override

     virtual SkPoint eval(Edge, SkScalar);

 };

 #endif