michael@0: 
michael@0: /*
michael@0:  * Copyright 2009 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef SkEdgeClipper_DEFINED
michael@0: #define SkEdgeClipper_DEFINED
michael@0: 
michael@0: #include "SkPath.h"
michael@0: 
michael@0: /** This is basically an iterator. It is initialized with an edge and a clip,
michael@0:     and then next() is called until it returns kDone_Verb.
michael@0:  */
michael@0: class SkEdgeClipper {
michael@0: public:
michael@0:     bool clipQuad(const SkPoint pts[3], const SkRect& clip);
michael@0:     bool clipCubic(const SkPoint pts[4], const SkRect& clip);
michael@0: 
michael@0:     SkPath::Verb next(SkPoint pts[]);
michael@0: 
michael@0: private:
michael@0:     SkPoint*        fCurrPoint;
michael@0:     SkPath::Verb*   fCurrVerb;
michael@0: 
michael@0:     enum {
michael@0:         kMaxVerbs = 13,
michael@0:         kMaxPoints = 32
michael@0:     };
michael@0:     SkPoint         fPoints[kMaxPoints];
michael@0:     SkPath::Verb    fVerbs[kMaxVerbs];
michael@0: 
michael@0:     void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
michael@0:     void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
michael@0:     void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
michael@0:     void appendQuad(const SkPoint pts[3], bool reverse);
michael@0:     void appendCubic(const SkPoint pts[4], bool reverse);
michael@0: };
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0:     void sk_assert_monotonic_x(const SkPoint pts[], int count);
michael@0:     void sk_assert_monotonic_y(const SkPoint pts[], int count);
michael@0: #else
michael@0:     #define sk_assert_monotonic_x(pts, count)
michael@0:     #define sk_assert_monotonic_y(pts, count)
michael@0: #endif
michael@0: 
michael@0: #endif