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47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
// Aseprite Document Library
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// Copyright (c) 2020 Igara Studio S.A.
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//
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// This file is released under the terms of the MIT license.
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// Read LICENSE.txt for more information.
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "doc/color.h"
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#include <algorithm>
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namespace doc {
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color_t rgba_to_graya_using_hsv(const color_t c)
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{
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const uint8_t M = std::max(rgba_getr(c),
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std::max(rgba_getg(c),
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rgba_getb(c)));
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return graya(M,
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rgba_geta(c));
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}
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color_t rgba_to_graya_using_hsl(const color_t c)
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{
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const int m = std::min(rgba_getr(c),
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std::min(rgba_getg(c),
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rgba_getb(c)));
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const int M = std::max(rgba_getr(c),
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std::max(rgba_getg(c),
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rgba_getb(c)));
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return graya((M + m) / 2,
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rgba_geta(c));
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}
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color_t rgba_to_graya_using_luma(const color_t c)
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{
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return graya(rgb_luma(rgba_getr(c),
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rgba_getg(c),
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rgba_getb(c)),
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rgba_geta(c));
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}
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} // namespace doc
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