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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:38:11 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:38:11 +0000 |
commit | 265809de0590083e8edfee5aefae64c402b3f540 (patch) | |
tree | bbc5a8b83a18fa32afd23c408ff3eabc8ad52edb /src/bezier.h | |
parent | Initial commit. (diff) | |
download | xserver-xorg-input-libinput-265809de0590083e8edfee5aefae64c402b3f540.tar.xz xserver-xorg-input-libinput-265809de0590083e8edfee5aefae64c402b3f540.zip |
Adding upstream version 1.2.1.upstream/1.2.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/bezier.h')
-rw-r--r-- | src/bezier.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/bezier.h b/src/bezier.h new file mode 100644 index 0000000..f86588b --- /dev/null +++ b/src/bezier.h @@ -0,0 +1,71 @@ +/* + * 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 |