cull edges that are to the right of the clip

src/core/SkEdgeClipper.h

 
 /*
  * Copyright 2009 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 SkEdgeClipper_DEFINED
 #define SkEdgeClipper_DEFINED
 
 #include "SkPath.h"
 
 /** This is basically an iterator. It is initialized with an edge and a clip,
     and then next() is called until it returns kDone_Verb.
  */
 class SkEdgeClipper {
 public:
+    SkEdgeClipper(bool canCullToTheRight) : fCanCullToTheRight(canCullToTheRight) {}
+
     bool clipQuad(const SkPoint pts[3], const SkRect& clip);
     bool clipCubic(const SkPoint pts[4], const SkRect& clip);
 
     SkPath::Verb next(SkPoint pts[]);
 
+    bool canCullToTheRight() const { return fCanCullToTheRight; }
+
 private:
     SkPoint*        fCurrPoint;
     SkPath::Verb*   fCurrVerb;
+    const bool      fCanCullToTheRight;
 
     enum {
         kMaxVerbs = 13,
         kMaxPoints = 32
     };
     SkPoint         fPoints[kMaxPoints];
     SkPath::Verb    fVerbs[kMaxVerbs];
 
     void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
     void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
     void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
     void appendQuad(const SkPoint pts[3], bool reverse);
     void appendCubic(const SkPoint pts[4], bool reverse);
 };
 
 #ifdef SK_DEBUG
     void sk_assert_monotonic_x(const SkPoint pts[], int count);
     void sk_assert_monotonic_y(const SkPoint pts[], int count);
 #else
     #define sk_assert_monotonic_x(pts, count)
     #define sk_assert_monotonic_y(pts, count)
 #endif
 
 #endif