src/colors.cpp

Wed, 22 Jun 2022 22:50:37 +0300

author
Teemu Piippo <teemu.s.piippo@gmail.com>
date
Wed, 22 Jun 2022 22:50:37 +0300
changeset 255
5188f8a74a5c
parent 250
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child 259
c27612f0eac0
permissions
-rw-r--r--

Add x, y, z properties to VectorInput

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

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