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 SkEdgeClipper(bool canCullToTheRight) : fCanCullToTheRight(canCullToTheRight) {} 21 22 bool clipQuad(const SkPoint pts[3], const SkRect& clip); 23 bool clipCubic(const SkPoint pts[4], const SkRect& clip); 24 25 SkPath::Verb next(SkPoint pts[]); 26 27 bool canCullToTheRight() const { return fCanCullToTheRight; } 28 29 private: 30 SkPoint* fCurrPoint; 31 SkPath::Verb* fCurrVerb; 32 const bool fCanCullToTheRight; 33 34 enum { 35 kMaxVerbs = 13, 36 kMaxPoints = 32 37 }; 38 SkPoint fPoints[kMaxPoints]; 39 SkPath::Verb fVerbs[kMaxVerbs]; 40 41 void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); 42 void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); 43 void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); 44 void appendQuad(const SkPoint pts[3], bool reverse); 45 void appendCubic(const SkPoint pts[4], bool reverse); 46 }; 47 48 #ifdef SK_DEBUG 49 void sk_assert_monotonic_x(const SkPoint pts[], int count); 50 void sk_assert_monotonic_y(const SkPoint pts[], int count); 51 #else 52 #define sk_assert_monotonic_x(pts, count) 53 #define sk_assert_monotonic_y(pts, count) 54 #endif 55 56 #endif 57
