Analytic AntiAlias for Convex Shapes

src/core/SkEdgeBuilder.h

 /*
  * 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 SkEdgeBuilder_DEFINED
 #define SkEdgeBuilder_DEFINED
 
 #include "SkChunkAlloc.h"
 #include "SkRect.h"
 #include "SkTDArray.h"
 
 struct SkEdge;
+struct SkAnalyticEdge;
 class SkEdgeClipper;
 class SkPath;
 
 class SkEdgeBuilder {
 public:
     SkEdgeBuilder();
 
     // returns the number of built edges. The array of those edge pointers
     // is returned from edgeList().
-    int build(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight);
+    int build(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight,
+              bool analyticAA = false);
 
-    SkEdge** edgeList() { return fEdgeList; }
+    SkEdge** edgeList() { return (SkEdge**)fEdgeList; }
+    SkAnalyticEdge** analyticEdgeList() { return (SkAnalyticEdge**)fEdgeList; }
 
 private:
     enum Combine {
         kNo_Combine,
         kPartial_Combine,
         kTotal_Combine
     };
 
-    static Combine CombineVertical(const SkEdge* edge, SkEdge* last);
+    Combine CombineVertical(const SkEdge* edge, SkEdge* last);
+    Combine CombineVertical(const SkAnalyticEdge* edge, SkAnalyticEdge* last);
     Combine checkVertical(const SkEdge* edge, SkEdge** edgePtr);
+    Combine checkVertical(const SkAnalyticEdge* edge, SkAnalyticEdge** edgePtr);
+    bool vertical_line(const SkEdge* edge);
+    bool vertical_line(const SkAnalyticEdge* edge);
 
     SkChunkAlloc        fAlloc;
-    SkTDArray<SkEdge*>  fList;
+    SkTDArray<void*>    fList;
 
     /*
      *  If we're in general mode, we allcoate the pointers in fList, and this
      *  will point at fList.begin(). If we're in polygon mode, fList will be
      *  empty, as we will have preallocated room for the pointers in fAlloc's
      *  block, and fEdgeList will point into that.
      */
-    SkEdge**    fEdgeList;
+    void**      fEdgeList;
 
     int         fShiftUp;
+    bool        fAnalyticAA;
 
 public:
     void addLine(const SkPoint pts[]);
     void addQuad(const SkPoint pts[]);
     void addCubic(const SkPoint pts[]);
     void addClipper(SkEdgeClipper*);
 
     int buildPoly(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight);
 };
 
 #endif