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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkTrimPathEffect_DEFINED
#define SkTrimPathEffect_DEFINED
#include "SkPathEffect.h"
class SK_API SkTrimPathEffect {
public:
enum class Mode {
kNormal, // return the subset path [start,stop]
kInverted, // return the complement/subset paths [0,start] + [stop,1]
};
/**
* Take start and stop "t" values (values between 0...1), and return a path that is that
* subset of the original path.
*
* e.g.
* Make(0.5, 1.0) --> return the 2nd half of the path
* Make(0.33333, 0.66667) --> return the middle third of the path
*
* The trim values apply to the entire path, so if it contains several contours, all of them
* are including in the calculation.
*
* startT and stopT must be 0..1 inclusive. If they are outside of that interval, they will
* be pinned to the nearest legal value. If either is NaN, null will be returned.
*
* Note: for Mode::kNormal, this will return one (logical) segment (even if it is spread
* across multiple contours). For Mode::kInverted, this will return 2 logical
* segments: 0...stopT and startT...1
*/
static sk_sp<SkPathEffect> Make(SkScalar startT, SkScalar stopT, Mode = Mode::kNormal);
};
#endif
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