1 2 /* 3 * Copyright 2009 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkEdgeClipper_DEFINED 11 #define SkEdgeClipper_DEFINED 12 13 #include "SkPath.h" 14 15 /** This is basically an iterator. It is initialized with an edge and a clip, 16 and then next() is called until it returns kDone_Verb. 17 */ 18 class SkEdgeClipper { 19 public: 20 bool clipQuad(const SkPoint pts[3], const SkRect& clip); 21 bool clipCubic(const SkPoint pts[4], const SkRect& clip); 22 23 SkPath::Verb next(SkPoint pts[]); 24 25 private: 26 SkPoint* fCurrPoint; 27 SkPath::Verb* fCurrVerb; 28 29 enum { 30 kMaxVerbs = 13, 31 kMaxPoints = 32 32 }; 33 SkPoint fPoints[kMaxPoints]; 34 SkPath::Verb fVerbs[kMaxVerbs]; 35 36 void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); 37 void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); 38 void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); 39 void appendQuad(const SkPoint pts[3], bool reverse); 40 void appendCubic(const SkPoint pts[4], bool reverse); 41 }; 42 43 #ifdef SK_DEBUG 44 void sk_assert_monotonic_x(const SkPoint pts[], int count); 45 void sk_assert_monotonic_y(const SkPoint pts[], int count); 46 #else 47 #define sk_assert_monotonic_x(pts, count) 48 #define sk_assert_monotonic_y(pts, count) 49 #endif 50 51 #endif 52