libcruft-util/colour.hpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
* Copyright 2010-2015 Danny Robson <danny@nerdcruft.net>
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*/
#ifndef __UTIL_COLOUR_HPP
#define __UTIL_COLOUR_HPP
#include "coord.hpp"
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#include "json/tree.hpp"
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#include <iostream>
namespace util {
/// An RGBA colour POD type.
template <size_t S, typename T>
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struct colour : public coord::base<S,T,colour,coord::rgba,coord::hsv> {
using coord::base<S,T,util::colour,coord::rgba,coord::hsv>::base;
using base_t = coord::base<S,T,util::colour,coord::rgba,coord::hsv>;
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template <typename U>
colour<S,U>
cast (void) const;
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static const colour WHITE;
static const colour BLACK;
static const colour RED;
static const colour BLUE;
static const colour GREEN;
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static colour from_html (const std::string&);
static colour from_x11 (const std::string&);
static colour from_string (const std::string&);
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};
// Convenience types
typedef colour<4,float> colour4f;
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typedef colour<3,float> colour3f;
// RGB <-> HSV
colour3f rgb_to_hsv (colour3f);
colour3f hsv_to_rgb (colour3f);
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// Serialisation
const json::tree::node& operator>> (const json::tree::node&, util::colour4f&);
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template <size_t S, typename T>
std::ostream& operator<< (std::ostream&, util::colour<S,T>);
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}
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#include "colour.ipp"
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#endif