827af667bb
Add support for multiple contours, and an explicit "inverted" mode. Bug: skia: Change-Id: Iafadbbe9d4692f2467a4ef8585f7fcd9cee9566a Reviewed-on: https://skia-review.googlesource.com/113270 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Florin Malita <fmalita@chromium.org>
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkTrimPathEffect_DEFINED
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#define SkTrimPathEffect_DEFINED
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#include "SkPathEffect.h"
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class SK_API SkTrimPathEffect {
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public:
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enum class Mode {
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kNormal, // return the subset path [start,stop]
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kInverted, // return the complement/subset paths [0,start] + [stop,1]
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};
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/**
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* Take start and stop "t" values (values between 0...1), and return a path that is that
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* subset of the original path.
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*
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* e.g.
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* Make(0.5, 1.0) --> return the 2nd half of the path
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* Make(0.33333, 0.66667) --> return the middle third of the path
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*
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* The trim values apply to the entire path, so if it contains several contours, all of them
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* are including in the calculation.
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*
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* startT and stopT must be 0..1 inclusive. If they are outside of that interval, they will
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* be pinned to the nearest legal value. If either is NaN, null will be returned.
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*
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* Note: for Mode::kNormal, this will return one (logical) segment (even if it is spread
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* across multiple contours). For Mode::kInverted, this will return 2 logical
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* segments: 0...stopT and startT...1
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*/
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static sk_sp<SkPathEffect> Make(SkScalar startT, SkScalar stopT, Mode = Mode::kNormal);
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};
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#endif
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