1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkTrimPathEffect_DEFINED 9 #define SkTrimPathEffect_DEFINED 10 11 #include "include/core/SkPathEffect.h" 12 13 class SK_API SkTrimPathEffect { 14 public: 15 enum class Mode { 16 kNormal, // return the subset path [start,stop] 17 kInverted, // return the complement/subset paths [0,start] + [stop,1] 18 }; 19 20 /** 21 * Take start and stop "t" values (values between 0...1), and return a path that is that 22 * subset of the original path. 23 * 24 * e.g. 25 * Make(0.5, 1.0) --> return the 2nd half of the path 26 * Make(0.33333, 0.66667) --> return the middle third of the path 27 * 28 * The trim values apply to the entire path, so if it contains several contours, all of them 29 * are including in the calculation. 30 * 31 * startT and stopT must be 0..1 inclusive. If they are outside of that interval, they will 32 * be pinned to the nearest legal value. If either is NaN, null will be returned. 33 * 34 * Note: for Mode::kNormal, this will return one (logical) segment (even if it is spread 35 * across multiple contours). For Mode::kInverted, this will return 2 logical 36 * segments: stopT..1 and 0...startT, in this order. 37 */ 38 static sk_sp<SkPathEffect> Make(SkScalar startT, SkScalar stopT, Mode = Mode::kNormal); 39 }; 40 41 #endif 42