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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2016 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef BEZIER_H
#define BEZIER_H
#include <stdlib.h>
#include <stdbool.h>
struct bezier_control_point {
double x, y;
};
extern const struct bezier_control_point bezier_defaults[4];
/**
* Given four control points in the range [(0.0/0.0), (1.0/1.0)]
* construct a Bézier curve.
*
* ^
*1.0 | c2 ______ c3
* | _/
* | /
* |c1 /
* | /
* | /
* |/_________________>
* c0 1.0
*
* This function requires that c[i].x <= c[i+1].x
*
* The curve is mapped into a canvas size [0, bezier_sz)². For each x
* coordinate in [0, bezier_sz), the matching y coordinate is thus
* bezier[x].
*
* In other words, if you have a range [0,2048) input possible values,
* the output is a list of 2048 points in a [0, 2048) range.
*
* @return true on success, false otherwise
*/
bool
cubic_bezier(const struct bezier_control_point controls[4],
int *bezier,
size_t bezier_sz);
#endif
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