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1 /** |
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2 * Relational pipes |
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3 * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation, version 3 of the License. |
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8 * |
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9 * This program is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 * GNU General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU General Public License |
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15 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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16 */ |
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17 |
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18 #include <unistd.h> |
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19 |
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20 #include <Magick++.h> |
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21 #include <zbar.h> |
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22 |
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23 #include <relpipe/xmlwriter/XMLWriter.h> |
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24 |
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25 #include "streamlet-common.h" |
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26 |
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27 /** |
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28 * This streamlet extracts QR codes from image files. |
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29 * |
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30 * It provides three attributes: |
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31 * - qr: first QR code found (if any) |
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32 * - qr_count: number of QR codes found |
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33 * - qr_xml: XML containing all QR cpdes found an additional metadata |
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34 * |
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35 */ |
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36 class QRStreamlet : public Streamlet { |
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37 private: |
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38 |
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39 const wstring XMLNS = L"tag:globalcode.info,2018:qr:FIXME:final-xmlns"; // FIXME: correct xmlns URI |
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40 |
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41 class Point { |
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42 public: |
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43 int x; |
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44 int y; |
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45 }; |
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46 |
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47 class Symbol { |
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48 public: |
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49 int id; |
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50 std::wstring value; |
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51 std::wstring type; |
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52 int x; |
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53 int y; |
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54 int width; |
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55 int height; |
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56 std::vector<Point> polygon; |
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57 }; |
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58 |
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59 std::vector<Symbol> findSymbols(std::wstring fileName) { |
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60 std::vector<Symbol> result; |
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61 |
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62 Magick::Image magick(toBytes(fileName)); |
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63 int width = magick.columns(); |
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64 int height = magick.rows(); |
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65 Magick::Blob blob; |
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66 magick.modifyImage(); |
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67 magick.write(&blob, "GRAY", 8); |
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68 const void *raw = blob.data(); |
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69 |
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70 zbar::Image image(width, height, "Y800", raw, width * height); |
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71 zbar::ImageScanner scanner; |
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72 |
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73 scanner.scan(image); |
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74 |
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75 int id = 0; |
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76 for (zbar::Image::SymbolIterator symbol = image.symbol_begin(); symbol != image.symbol_end(); ++symbol, id++) { |
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77 Symbol s; |
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78 |
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79 |
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80 s.id = id; |
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81 s.type = fromBytes(symbol->get_type_name()); |
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82 s.value = fromBytes(symbol->get_data()); |
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83 |
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84 int minX = 0; |
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85 int minY = 0; |
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86 int maxX = 0; |
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87 int maxY = 0; |
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88 |
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89 // TODO: return original polygon in XML |
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90 for (int i = 0, locationSize = symbol->get_location_size(); i < locationSize; i++) { |
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91 int x = symbol->get_location_x(i); |
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92 int y = symbol->get_location_y(i); |
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93 minX = minX ? std::min(minX, x) : x; |
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94 minY = minY ? std::min(minY, y) : y; |
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95 maxX = std::max(maxX, x); |
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96 maxY = std::max(maxY, y); |
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97 s.polygon.push_back({x, y}); |
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98 } |
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99 |
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100 s.x = minX; |
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101 s.y = minY; |
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102 s.width = maxX - minX; |
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103 s.height = maxY - minY; |
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104 |
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105 result.push_back(s); |
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106 } |
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107 |
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108 |
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109 |
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110 return result; |
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111 } |
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112 |
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113 protected: |
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114 |
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115 std::vector<AttributeMetadata> getOutputAttributesMetadata() override { |
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116 std::vector<AttributeMetadata> oam; |
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117 int i = 0; |
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118 oam.push_back({getAlias(i++, L"qr"), STRING}); |
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119 oam.push_back({getAlias(i++, L"qr_count"), INTEGER}); |
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120 oam.push_back({getAlias(i++, L"qr_xml"), STRING}); |
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121 return oam; |
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122 } |
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123 |
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124 std::vector<OutputAttribute> getOutputAttributes() override { |
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125 bool validInput = false; |
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126 bool hasSymbols = false; |
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127 std::wstring first; |
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128 std::stringstream xml; |
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129 |
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130 std::vector<Symbol> symbols; |
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131 try { |
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132 symbols = findSymbols(getCurrentFile()); |
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133 validInput = true; |
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134 } catch (...) { |
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135 // just ignore the errors; |
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136 // the file is probably not an image or we do not have read permissions |
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137 validInput = false; |
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138 } |
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139 |
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140 for (Symbol s : symbols) { |
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141 // TODO: match against pattern (if any) |
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142 first = s.value; |
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143 hasSymbols = true; |
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144 break; |
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145 } |
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146 |
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147 relpipe::xmlwriter::XMLWriter xmlWriter(xml); |
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148 xmlWriter.writeStartElement(L"qr",{L"xmlns", XMLNS}); |
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149 |
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150 // TODO: common metadata |
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151 // xmlWriter.writeStartElement(L"source"); |
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152 // xmlWriter.writeTextElement(L"height",{}, std::to_wstring(...)); |
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153 // xmlWriter.writeTextElement(L"width",{}, std::to_wstring(...)); |
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154 // xmlWriter.writeEndElement(); |
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155 |
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156 for (Symbol s : symbols) { |
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157 xmlWriter.writeStartElement(L"symbol"); |
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158 xmlWriter.writeTextElement(L"value",{}, s.value); |
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159 |
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160 // TODO: well-designed XML schema |
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161 // TODO: synchronize/share common XML parts with relpipe-in-qr |
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162 xmlWriter.writeStartElement(L"rectangular-box"); |
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163 xmlWriter.writeTextElement(L"x",{}, std::to_wstring(s.x)); |
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164 xmlWriter.writeTextElement(L"y",{}, std::to_wstring(s.y)); |
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165 xmlWriter.writeTextElement(L"height",{}, std::to_wstring(s.height)); |
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166 xmlWriter.writeTextElement(L"width",{}, std::to_wstring(s.width)); |
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167 xmlWriter.writeEndElement(); |
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168 |
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169 xmlWriter.writeStartElement(L"polygon"); |
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170 for (Point p : s.polygon) xmlWriter.writeEmptyElement(L"point",{L"x", std::to_wstring(p.x), L"y", std::to_wstring(p.y)}); |
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171 xmlWriter.writeEndElement(); |
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172 |
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173 xmlWriter.writeEndElement(); |
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174 } |
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175 |
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176 xmlWriter.writeEndElement(); |
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177 |
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178 std::vector<OutputAttribute> oa; |
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179 // TODO: report also validInput (distinguish it from hasSymbols) |
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180 oa.push_back({first, !hasSymbols}); |
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181 oa.push_back({std::to_wstring(symbols.size()), false}); |
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182 oa.push_back({fromBytes(xml.str()), false}); |
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183 return oa; |
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184 } |
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185 }; |
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186 |
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187 STREAMLET_RUN(QRStreamlet) |