67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
/*
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* \brief Color representation
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* \date 2006-08-04
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* \author Norman Feske
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__UTIL__COLOR_H_
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#define _INCLUDE__UTIL__COLOR_H_
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#include <util/string.h>
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namespace Genode {
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struct Color;
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inline size_t ascii_to(const char *, Color *, unsigned base = 0);
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}
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struct Genode::Color
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{
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int r, g, b, a;
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bool is_opaque() const { return a == 255; }
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bool is_transparent() const { return a == 0; }
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Color(int red, int green, int blue, int alpha = 255)
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: r(red), g(green), b(blue), a(alpha) { }
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Color(): r(0), g(0), b(0), a(0) { }
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};
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/**
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* Convert ASCII string to Color
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*
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* The ASCII string must have the format '#rrggbb'
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*
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* \return number of consumed characters, or 0 if the string contains
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* no valid color
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*/
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inline Genode::size_t Genode::ascii_to(const char *s, Genode::Color *result, unsigned)
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{
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/* validate string */
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if (strlen(s) < 7 || *s != '#') return 0;
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enum { HEX = true };
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for (unsigned i = 0; i < 6; i++)
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if (!is_digit(s[i + 1], HEX)) return 0;
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int red = 16*digit(s[1], HEX) + digit(s[2], HEX),
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green = 16*digit(s[3], HEX) + digit(s[4], HEX),
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blue = 16*digit(s[5], HEX) + digit(s[6], HEX);
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*result = Color(red, green, blue);
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return 7;
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}
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#endif /* _INCLUDE__UTIL__COLOR_H_ */
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