43 lines
892 B
C
43 lines
892 B
C
/* Copyright (c), Niclas Meyer <niclas@countingsort.com>
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "color.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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bool
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color_parse(const char *hex, float color[static 4])
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{
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if (hex[0] == '#') {
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++hex;
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}
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int len = strlen(hex);
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if (len != 6 && len != 8) {
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return false;
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}
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uint32_t rgba = (uint32_t)strtoul(hex, NULL, 16);
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if (len == 6) {
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rgba = (rgba << 8) | 0xff;
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}
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for (size_t i = 0; i < 4; ++i) {
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color[3 - i] = (rgba & 0xff) / 255.0;
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rgba >>= 8;
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}
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// premultiply alpha
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color[0] *= color[3];
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color[1] *= color[3];
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color[2] *= color[3];
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return true;
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}
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