93 lines
2.2 KiB
C++
93 lines
2.2 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) 2006-2017 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 Affero General Public License version 3.
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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 &);
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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 opaque() const { return a == 255; }
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bool 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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bool operator == (Color const &other) const {
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return other.r == r && other.g == g && other.b == b; }
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bool operator != (Color const &other) const {
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return !operator == (other); }
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void print(Output &output) const
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{
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using Genode::print;
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print(output, Char('#'));
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print(output, Hex((unsigned char)r, Hex::OMIT_PREFIX, Hex::PAD));
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print(output, Hex((unsigned char)g, Hex::OMIT_PREFIX, Hex::PAD));
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print(output, Hex((unsigned char)b, Hex::OMIT_PREFIX, Hex::PAD));
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if (a != 255)
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print(output, Hex((unsigned char)a, Hex::OMIT_PREFIX, Hex::PAD));
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}
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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' or '#rrggbbaa'.
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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)
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{
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/* validate string */
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Genode::size_t const len = strlen(s);
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if (len < 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 const 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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bool const has_alpha = (len >= 9) && is_digit(s[7], HEX) && is_digit(s[8], HEX);
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int const alpha = has_alpha ? 16*digit(s[7], HEX) + digit(s[8], HEX) : 255;
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result = Color(red, green, blue, alpha);
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return has_alpha ? 9 : 7;
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}
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#endif /* _INCLUDE__UTIL__COLOR_H_ */
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