src/colors.cpp

Tue, 28 Jun 2022 17:59:34 +0300

author
Teemu Piippo <teemu.s.piippo@gmail.com>
date
Tue, 28 Jun 2022 17:59:34 +0300
changeset 291
42b4953dff85
parent 264
76a025db4948
permissions
-rw-r--r--

Let's bring GLEW back after all

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1 #include <QRegExp>
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2 #include <QIODevice>
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3 #include "src/colors.h"
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4
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5 const ColorDefinition unknownColor{{}, {}, "Unknown", "???"};
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6
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7 template<typename... Args>
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8 static QString replaced(QString text, Args&&... args)
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9 {
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10 text.replace(args...);
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11 return text;
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12 }
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13
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14 /**
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15 * @brief Parses an LDConfig.ldr line from a string
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16 * @param string LDConfig.ldr line to parse
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17 */
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18 static auto loadColorFromString(const QString& string)
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19 {
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20 std::optional<std::pair<ColorIndex, ColorDefinition>> result;
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21 static const QRegExp pattern{QStringLiteral(
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22 R"(^\s*0 \!COLOUR\s+([^\s]+)\s+)"
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23 R"(CODE\s+(\d+)\s+)"
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24 R"(VALUE\s+(\#[0-9a-fA-F]{3,6})\s+)"
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25 R"(EDGE\s+(\#[0-9a-fA-F]{3,6}))"
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26 R"((?:\s+ALPHA\s+(\d+))?)"
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27 )};
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28 if (pattern.indexIn(string) != -1)
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29 {
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30 const int code = pattern.cap(2).toInt();
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31 const QString name = pattern.cap(1);
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32 ColorDefinition definition = {
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33 .faceColor = pattern.cap(3),
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34 .edgeColor = pattern.cap(4),
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35 .name = name,
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36 .displayName = replaced(name, "_", " "),
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37 };
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38 if (not pattern.cap(5).isEmpty())
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39 {
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40 const int alpha = pattern.cap(5).toInt();
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41 definition.faceColor.setAlpha(alpha);
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42 }
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43 result = std::make_pair(ColorIndex{code}, definition);
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44 }
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45 return result;
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46 }
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47
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48 /**
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49 * @brief Loads colors from LDConfig.ldr
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50 */
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51 std::optional<ColorTable> loadColorTable(QIODevice &device, QTextStream &errors)
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52 {
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53 std::optional<ColorTable> result;
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54 if (device.isReadable())
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55 {
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56 result.emplace();
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57 QTextStream stream{&device};
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58 QString line;
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59 while (stream.readLineInto(&line))
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60 {
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61 const auto pair = loadColorFromString(line);
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62 if (pair.has_value()) {
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63 (*result)[pair->first] = pair->second;
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64 }
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65 }
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66 }
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67 else
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68 {
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69 errors << "could not read colors";
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70 }
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71 return result;
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72 }
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73
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74 /**
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75 * @brief Calculates the luma-value for the given color.
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76 * @details c.f. https://en.wikipedia.org/wiki/Luma_(video)
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77 * @param color
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78 * @returns luma value [0, 1]
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79 */
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80 qreal luma(const QColor& color)
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81 {
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82 return luma(color.redF(), color.greenF(), color.blueF());
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83 }
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84
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85 //! @brief Returns a direct color index that codes the specified color value
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86 ColorIndex directColor(const QColor& color)
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87 {
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88 return directColor(color.red(), color.green(), color.blue());
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89 }
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90
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91 //! @brief Returns a face color for @param color, taking direct colors into account
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92 std::optional<QColor> colorFace(ColorIndex color, const ColorTable& colorTable)
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93 {
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94 std::optional<QColor> result;
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95 if (isDirectColor(color)) {
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96 const std::array<int, 3> rgb = directColorRgb(color);
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97 result = QColor{rgb[0], rgb[1], rgb[2]};
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98 }
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99 else {
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100 const ColorDefinition* def = findInMap(colorTable, color);
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101 if (def != nullptr) {
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102 result = def->faceColor;
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103 }
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104 }
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105 return result;
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106 }
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107
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108 //! @brief Returns an edge color for @param color, taking direct colors into account
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109 std::optional<QColor> colorEdge(ColorIndex color, const ColorTable& colorTable)
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110 {
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111 if (isDirectColor(color)) {
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112 const std::array<int, 3> rgb = directColorRgb(color);
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113 return (luma(rgb[0], rgb[1], rgb[2]) < 102) ? Qt::white : Qt::black;
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114 }
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115 else {
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116 return colorFace(color, colorTable);
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117 }
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118 }
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119
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120 QDataStream& operator<<(QDataStream& stream, ColorIndex color)
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121 {
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122 return stream << color.index;
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123 }
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124
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125 QDataStream& operator>>(QDataStream& stream, ColorIndex& color)
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126 {
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127 return stream >> color.index;
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128 }
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129
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130 std::optional<QString> colorDisplayName(ColorIndex color, const ColorTable &colorTable)
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131 {
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132 std::optional<QString> result;
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133 if (isDirectColor(color)) {
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134 result = colorFace(color, colorTable).value_or(QColor{}).name();
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135 }
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136 else {
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137 const ColorDefinition* def = findInMap(colorTable, color);
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138 if (def != nullptr) {
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139 result = def->displayName;
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140 }
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141 }
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142 return result;
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143 }

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