1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkEdgeClipper_DEFINED 18 #define SkEdgeClipper_DEFINED 19 20 #include "SkPath.h" 21 22 /** This is basically an iterator. It is initialized with an edge and a clip, 23 and then next() is called until it returns kDone_Verb. 24 */ 25 class SkEdgeClipper { 26 public: 27 bool clipQuad(const SkPoint pts[3], const SkRect& clip); 28 bool clipCubic(const SkPoint pts[4], const SkRect& clip); 29 30 SkPath::Verb next(SkPoint pts[]); 31 32 private: 33 SkPoint* fCurrPoint; 34 SkPath::Verb* fCurrVerb; 35 36 enum { 37 kMaxVerbs = 13, 38 kMaxPoints = 32 39 }; 40 SkPoint fPoints[kMaxPoints]; 41 SkPath::Verb fVerbs[kMaxVerbs]; 42 43 void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); 44 void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); 45 void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); 46 void appendQuad(const SkPoint pts[3], bool reverse); 47 void appendCubic(const SkPoint pts[4], bool reverse); 48 }; 49 50 #ifdef SK_DEBUG 51 void sk_assert_monotonic_x(const SkPoint pts[], int count); 52 void sk_assert_monotonic_y(const SkPoint pts[], int count); 53 #else 54 #define sk_assert_monotonic_x(pts, count) 55 #define sk_assert_monotonic_y(pts, count) 56 #endif 57 58 #endif 59
