404 lines
15 KiB
C++
404 lines
15 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2013 Danny Robson <danny@nerdcruft.net>
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*/
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#include "colour.hpp"
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#include "range.hpp"
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#include "random.hpp"
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#include "stream.hpp"
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#include <map>
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//-----------------------------------------------------------------------------
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using util::colour;
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using util::colour3f;
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using util::colour4f;
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//-----------------------------------------------------------------------------
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#define CONSTANT_COLOUR(NAME,R,G,B) \
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template <size_t S, typename T> \
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const util::colour<S,T> \
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util::colour<S,T>::NAME = \
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util::colour<4,float> (R,G,B,1) \
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.template redim<S> () \
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.template cast<T> ()
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CONSTANT_COLOUR(WHITE,1,1,1);
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CONSTANT_COLOUR(BLACK,0,0,0);
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CONSTANT_COLOUR(RED, 1,0,0);
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CONSTANT_COLOUR(GREEN,0,1,0);
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CONSTANT_COLOUR(BLUE, 0,0,1);
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//-----------------------------------------------------------------------------
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static const std::map<std::string, colour<4,uint8_t>>
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HTML_COLOURS { {
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{ "white", { 0xff, 0xff, 0xff, 0xff } },
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{ "silver", { 0xc0, 0xc0, 0xc0, 0xff } },
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{ "gray", { 0x80, 0x80, 0x80, 0xff } },
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{ "black", { 0x00, 0x00, 0x00, 0xff } },
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{ "red", { 0xff, 0x00, 0x00, 0xff } },
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{ "maroon", { 0x80, 0x00, 0x00, 0xff } },
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{ "yellow", { 0xff, 0xff, 0x00, 0xff } },
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{ "olive", { 0x80, 0x80, 0x00, 0xff } },
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{ "lime", { 0x00, 0xff, 0x00, 0xff } },
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{ "green", { 0x00, 0x80, 0x00, 0xff } },
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{ "aqua", { 0x00, 0xff, 0xff, 0xff } },
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{ "teal", { 0x00, 0x80, 0x80, 0xff } },
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{ "blue", { 0x00, 0x00, 0xff, 0xff } },
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{ "navy", { 0x00, 0x00, 0x80, 0xff } },
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{ "fuchsia", { 0xff, 0x00, 0xff, 0xff } },
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{ "purple", { 0x80, 0x00, 0x80, 0xff } },
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} };
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//-----------------------------------------------------------------------------
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static const std::map<std::string, colour<4,uint8_t>> X11_COLOURS
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{
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/* pink */
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{ "pink", { 0xff, 0xc0, 0xcb, 0xff } },
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{ "lightpink", { 0xff, 0xb6, 0xc1, 0xff } },
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{ "hotpink", { 0xff, 0x69, 0xb4, 0xff } },
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{ "deeppink", { 0xff, 0x14, 0x93, 0xff } },
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{ "palevioletred", { 0xdb, 0x70, 0x93, 0xff } },
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{ "mediumvioletred", { 0xc7, 0x15, 0x85, 0xff } },
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/* red */
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{ "lightsalmon", { 0xff, 0xa0, 0x7a, 0xff } },
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{ "salmon", { 0xfa, 0x80, 0x72, 0xff } },
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{ "darksalmon", { 0xe9, 0x96, 0x7a, 0xff } },
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{ "lightcoral", { 0xf0, 0x80, 0x80, 0xff } },
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{ "indianred", { 0xcd, 0x5c, 0x5c, 0xff } },
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{ "crimson", { 0xdc, 0x14, 0x3c, 0xff } },
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{ "firebrick", { 0xb2, 0x22, 0x22, 0xff } },
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{ "darkred", { 0x8b, 0x00, 0x00, 0xff } },
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{ "red", { 0xff, 0x00, 0x00, 0xff } },
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/* orange */
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{ "orangered", { 0xff, 0x45, 0x00, 0xff } },
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{ "tomato", { 0xff, 0x63, 0x47, 0xff } },
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{ "coral", { 0xff, 0x7f, 0x50, 0xff } },
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{ "darkorange", { 0xff, 0x8c, 0x00, 0xff } },
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{ "orange", { 0xff, 0xa5, 0x00, 0xff } },
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/* yellow */
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{ "yellow", { 0xff, 0xff, 0x00, 0xff } },
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{ "lightyellow", { 0xff, 0xff, 0xe0, 0xff } },
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{ "lemonchiffon", { 0xff, 0xfa, 0xcd, 0xff } },
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{ "lightgoldenrodyellow", { 0xfa, 0xfa, 0xd2, 0xff } },
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{ "papayawhip", { 0xff, 0xef, 0xd5, 0xff } },
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{ "moccasin", { 0xff, 0xe4, 0xb5, 0xff } },
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{ "peachpuff", { 0xff, 0xda, 0xb9, 0xff } },
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{ "palegoldenrod", { 0xee, 0xe8, 0xaa, 0xff } },
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{ "khaki", { 0xf0, 0xe6, 0x8c, 0xff } },
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{ "darkkhaki", { 0xbd, 0xb7, 0x6b, 0xff } },
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{ "gold", { 0xff, 0xd7, 0x00, 0xff } },
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/* brown */
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{ "cornsilk", { 0xff, 0xf8, 0xdc, 0xff } },
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{ "blanchedalmond", { 0xff, 0xeb, 0xcd, 0xff } },
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{ "bisque", { 0xff, 0xe4, 0xc4, 0xff } },
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{ "navajowhite", { 0xff, 0xde, 0xad, 0xff } },
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{ "wheat", { 0xf5, 0xde, 0xb3, 0xff } },
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{ "burlywood", { 0xde, 0xb8, 0x87, 0xff } },
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{ "tan", { 0xd2, 0xb4, 0x8c, 0xff } },
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{ "rosybrown", { 0xbc, 0x8f, 0x8f, 0xff } },
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{ "sandybrown", { 0xf4, 0xa4, 0x60, 0xff } },
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{ "goldenrod", { 0xda, 0xa5, 0x20, 0xff } },
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{ "darkgoldenrod", { 0xb8, 0x86, 0x0b, 0xff } },
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{ "peru", { 0xcd, 0x85, 0x3f, 0xff } },
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{ "chocolate", { 0xd2, 0x69, 0x1e, 0xff } },
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{ "saddlebrown", { 0x8b, 0x45, 0x13, 0xff } },
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{ "sienna", { 0xa0, 0x52, 0x2d, 0xff } },
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{ "brown", { 0xa5, 0x2a, 0x2a, 0xff } },
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{ "maroon", { 0x80, 0x00, 0x00, 0xff } },
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/* green */
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{ "darkolivegreen", { 0x55, 0x6b, 0x2f, 0xff } },
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{ "olive", { 0x80, 0x80, 0x00, 0xff } },
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{ "olivedrab", { 0x6b, 0x8e, 0x23, 0xff } },
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{ "yellowgreen", { 0x9a, 0xcd, 0x32, 0xff } },
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{ "limegreen", { 0x32, 0xcd, 0x32, 0xff } },
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{ "lime", { 0x00, 0xff, 0x00, 0xff } },
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{ "lawngreen", { 0x7c, 0xfc, 0x00, 0xff } },
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{ "chartreuse", { 0x7f, 0xff, 0x00, 0xff } },
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{ "greenyellow", { 0xad, 0xff, 0x2f, 0xff } },
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{ "springgreen", { 0x00, 0xff, 0x7f, 0xff } },
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{ "mediumspringgreen", { 0x00, 0xfa, 0x9a, 0xff } },
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{ "lightgreen", { 0x90, 0xee, 0x90, 0xff } },
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{ "palegreen", { 0x98, 0xfb, 0x98, 0xff } },
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{ "darkseagreen", { 0x8f, 0xbc, 0x8f, 0xff } },
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{ "mediumseagreen", { 0x3c, 0xb3, 0x71, 0xff } },
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{ "seagreen", { 0x2e, 0x8b, 0x57, 0xff } },
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{ "forestgreen", { 0x22, 0x8b, 0x22, 0xff } },
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{ "green", { 0x00, 0x80, 0x00, 0xff } },
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{ "darkgreen", { 0x00, 0x64, 0x00, 0xff } },
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/* cyan */
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{ "mediumaquamarine", { 0x66, 0xcd, 0xaa, 0xff } },
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{ "aqua", { 0x00, 0xff, 0xff, 0xff } },
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{ "cyan", { 0x00, 0xff, 0xff, 0xff } },
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{ "lightcyan", { 0xe0, 0xff, 0xff, 0xff } },
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{ "paleturquoise", { 0xaf, 0xee, 0xee, 0xff } },
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{ "aquamarine", { 0x7f, 0xff, 0xd4, 0xff } },
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{ "turquoise", { 0x40, 0xe0, 0xd0, 0xff } },
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{ "mediumturquoise", { 0x48, 0xd1, 0xcc, 0xff } },
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{ "darkturquoise", { 0x00, 0xce, 0xd1, 0xff } },
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{ "lightseagreen", { 0x20, 0xb2, 0xaa, 0xff } },
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{ "cadetblue", { 0x5f, 0x9e, 0xa0, 0xff } },
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{ "darkcyan", { 0x00, 0x8b, 0x8b, 0xff } },
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{ "teal", { 0x00, 0x80, 0x80, 0xff } },
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/* blue */
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{ "lightsteelblue", { 0xb0, 0xc4, 0xde, 0xff } },
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{ "powderblue", { 0xb0, 0xe0, 0xe6, 0xff } },
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{ "lightblue", { 0xad, 0xd8, 0xe6, 0xff } },
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{ "skyblue", { 0x87, 0xce, 0xeb, 0xff } },
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{ "lightskyblue", { 0x87, 0xce, 0xfa, 0xff } },
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{ "deepskyblue", { 0x00, 0xbf, 0xff, 0xff } },
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{ "dodgerblue", { 0x1e, 0x90, 0xff, 0xff } },
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{ "cornflowerblue", { 0x64, 0x95, 0xed, 0xff } },
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{ "steelblue", { 0x46, 0x82, 0xb4, 0xff } },
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{ "royalblue", { 0x41, 0x69, 0xe1, 0xff } },
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{ "blue", { 0x00, 0x00, 0xff, 0xff } },
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{ "mediumblue", { 0x00, 0x00, 0xcd, 0xff } },
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{ "darkblue", { 0x00, 0x00, 0x8b, 0xff } },
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{ "navy", { 0x00, 0x00, 0x80, 0xff } },
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{ "midnightblue", { 0x19, 0x19, 0x70, 0xff } },
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/* purple */
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{ "lavender", { 0xe6, 0xe6, 0xfa, 0xff } },
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{ "thistle", { 0xd8, 0xbf, 0xd8, 0xff } },
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{ "plum", { 0xdd, 0xa0, 0xdd, 0xff } },
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{ "violet", { 0xee, 0x82, 0xee, 0xff } },
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{ "orchid", { 0xda, 0x70, 0xd6, 0xff } },
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{ "fuchsia", { 0xff, 0x00, 0xff, 0xff } },
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{ "magenta", { 0xff, 0x00, 0xff, 0xff } },
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{ "mediumorchid", { 0xba, 0x55, 0xd3, 0xff } },
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{ "mediumpurple", { 0x93, 0x70, 0xdb, 0xff } },
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{ "blueviolet", { 0x8a, 0x2b, 0xe2, 0xff } },
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{ "darkviolet", { 0x94, 0x00, 0xd3, 0xff } },
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{ "darkorchid", { 0x99, 0x32, 0xcc, 0xff } },
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{ "darkmagenta", { 0x8b, 0x00, 0x8b, 0xff } },
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{ "purple", { 0x80, 0x00, 0x80, 0xff } },
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{ "indigo", { 0x4b, 0x00, 0x82, 0xff } },
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{ "darkslateblue", { 0x48, 0x3d, 0x8b, 0xff } },
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{ "rebeccapurple", { 0x66, 0x33, 0x99, 0xff } },
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{ "slateblue", { 0x6a, 0x5a, 0xcd, 0xff } },
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{ "mediumslateblue", { 0x7b, 0x68, 0xee, 0xff } },
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/* white */
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{ "white", { 0xff, 0xff, 0xff, 0xff } },
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{ "snow", { 0xff, 0xfa, 0xfa, 0xff } },
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{ "honeydew", { 0xf0, 0xff, 0xf0, 0xff } },
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{ "mintcream", { 0xf5, 0xff, 0xfa, 0xff } },
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{ "azure", { 0xf0, 0xff, 0xff, 0xff } },
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{ "aliceblue", { 0xf0, 0xf8, 0xff, 0xff } },
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{ "ghostwhite", { 0xf8, 0xf8, 0xff, 0xff } },
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{ "whitesmoke", { 0xf5, 0xf5, 0xf5, 0xff } },
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{ "seashell", { 0xff, 0xf5, 0xee, 0xff } },
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{ "beige", { 0xf5, 0xf5, 0xdc, 0xff } },
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{ "oldlace", { 0xfd, 0xf5, 0xe6, 0xff } },
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{ "floralwhite", { 0xff, 0xfa, 0xf0, 0xff } },
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{ "ivory", { 0xff, 0xff, 0xf0, 0xff } },
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{ "antiquewhite", { 0xfa, 0xeb, 0xd7, 0xff } },
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{ "linen", { 0xfa, 0xf0, 0xe6, 0xff } },
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{ "lavenderblush", { 0xff, 0xf0, 0xf5, 0xff } },
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{ "mistyrose", { 0xff, 0xe4, 0xe1, 0xff } },
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/* grey/black */
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{ "gainsboro", { 0xdc, 0xdc, 0xdc, 0xff } },
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{ "lightgrey", { 0xd3, 0xd3, 0xd3, 0xff } },
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{ "silver", { 0xc0, 0xc0, 0xc0, 0xff } },
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{ "darkgray", { 0xa9, 0xa9, 0xa9, 0xff } },
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{ "gray", { 0x80, 0x80, 0x80, 0xff } },
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{ "dimgray", { 0x69, 0x69, 0x69, 0xff } },
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{ "lightslategray", { 0x77, 0x88, 0x99, 0xff } },
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{ "slategray", { 0x70, 0x80, 0x90, 0xff } },
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{ "darkslategray", { 0x2f, 0x4f, 0x4f, 0xff } },
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{ "black", { 0x00, 0x00, 0x00, 0xff } },
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};
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//-----------------------------------------------------------------------------
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template <size_t S, typename T>
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static colour<S,T>
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lookup_colour (const std::string &name,
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const std::map<std::string,colour<4,uint8_t>> &map)
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{
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std::string lower (name);
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std::transform (lower.begin (), lower.end (), lower.begin (), tolower);
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auto pos = map.find (lower);
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if (pos == map.end ())
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throw std::out_of_range (name);
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static_assert (S <= 4, "cannot invent additional data");
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return pos->second.template redim<S> ().template cast<T> ();
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}
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//-----------------------------------------------------------------------------
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template <size_t S, typename T>
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colour<S,T>
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colour<S,T>::from_html (const std::string &name)
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{
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return lookup_colour<S,T> (name, HTML_COLOURS);
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}
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//-----------------------------------------------------------------------------
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template <size_t S, typename T>
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colour<S,T>
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colour<S,T>::from_x11 (const std::string &name)
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{
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return lookup_colour<S,T> (name, X11_COLOURS);
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}
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///////////////////////////////////////////////////////////////////////////////
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colour3f
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util::rgb_to_hsv (colour3f rgb)
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{
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// Calculate chroma
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auto M = max (rgb);
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auto m = min (rgb);
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auto C = M - m;
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// Undefined for zero chroma
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if (almost_zero (C))
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return { -1.f, 0.f, M };
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// Calculate hue
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float H = exactly_equal (rgb.r, M) ? (rgb.g - rgb.b) :
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exactly_equal (rgb.g, M) ? 2 + (rgb.b - rgb.r) :
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exactly_equal (rgb.b, M) ? 4 + (rgb.r - rgb.g) :
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0 ;
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H /= C;
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H *= 60;
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if (H < 0)
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H += 360;
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// Calculate value
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auto V = M;
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// Calculate saturation
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auto S = almost_zero (V) ? 0.f : C / V;
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return { H, S, V };
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}
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//-----------------------------------------------------------------------------
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colour3f
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util::hsv_to_rgb (colour3f hsv)
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{
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CHECK_GE (hsv.h, 0);
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CHECK_LT (hsv.h, 360);
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CHECK_GE (hsv.s, 0);
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CHECK_LE (hsv.s, 1);
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CHECK_GE (hsv.v, 0);
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CHECK_LE (hsv.v, 1);
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float C = hsv.v * hsv.s;
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float H = hsv.h / 60;
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float X = C * (1 - std::abs (std::fmod (H, 2.f) - 1));
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// monochromatic'ish
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if (almost_zero (hsv.s))
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return colour3f { hsv.v };
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colour3f rgb;
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unsigned hex = (unsigned)H;
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switch (hex) {
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case 0: rgb = { C, X, 0 }; break;
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case 1: rgb = { X, C, 0 }; break;
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case 2: rgb = { 0, C, X }; break;
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case 3: rgb = { 0, X, C }; break;
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case 4: rgb = { X, 0, C }; break;
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case 5: rgb = { C, 0, X }; break;
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}
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auto m = hsv.v - C;
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return rgb + m;
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}
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///----------------------------------------------------------------------------
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/// Extract a colour object from a JSON node.
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#include "json/tree.hpp"
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namespace json { namespace tree {
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template <>
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util::colour4f
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io<util::colour4f>::deserialise (const node &root) {
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return {
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root[0].as<float> (),
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root[1].as<float> (),
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root[2].as<float> (),
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root[3].as<float> (),
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};
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}
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} }
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//-----------------------------------------------------------------------------
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namespace util {
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template<>
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colour4f
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random (void) {
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return colour4f ({ range<float>::UNIT.random (),
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range<float>::UNIT.random (),
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range<float>::UNIT.random (),
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range<float>::UNIT.random () });
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}
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template <>
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colour4f&
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randomise (colour4f &c)
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{ return c = random<colour4f> (); }
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}
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//-----------------------------------------------------------------------------
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template <size_t S, typename T>
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std::ostream&
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util::operator<< (std::ostream &os, util::colour<S,T> c) {
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os << "colour(";
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for (size_t i = 0; i < S - 1; ++i)
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os << stream::numeric<T> (c[i]) << ", ";
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os << stream::numeric<T> (c[S-1]) << ")";
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return os;
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}
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//-----------------------------------------------------------------------------
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#define INSTANTIATE_S_T(S,T) \
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template struct util::colour<S,T>; \
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template std::ostream& util::operator<< (std::ostream&, util::colour<S,T>);
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#define INSTANTIATE_S(S) \
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INSTANTIATE_S_T(S,uint8_t) \
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INSTANTIATE_S_T(S,float) \
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INSTANTIATE_S_T(S,double)
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INSTANTIATE_S(3)
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INSTANTIATE_S(4)
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