8dd5ea1a75
AE/Lottie allow Bezier control Ys to be outside the [0..1] range. Update SkCubicMap to do the same. Bug: skia:8931 Change-Id: I54ee8dbb4e6e0a33a917500523c82fe56c854d4a Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205002 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Florin Malita <fmalita@chromium.org>
42 lines
844 B
C++
42 lines
844 B
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 SkCubicMap_DEFINED
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#define SkCubicMap_DEFINED
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#include "SkPoint.h"
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/**
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* Fast evaluation of a cubic ease-in / ease-out curve. This is defined as a parametric cubic
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* curve inside the unit square.
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*
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* pt[0] is implicitly { 0, 0 }
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* pt[3] is implicitly { 1, 1 }
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* pts[1,2].X are inside the unit [0..1]
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*/
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class SK_API SkCubicMap {
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public:
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SkCubicMap(SkPoint p1, SkPoint p2);
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float computeYFromX(float x) const;
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SkPoint computeFromT(float t) const;
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private:
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enum Type {
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kLine_Type, // x == y
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kCubeRoot_Type, // At^3 == x
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kSolver_Type, // general monotonic cubic solver
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};
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SkPoint fCoeff[3];
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Type fType;
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};
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#endif
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