Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/wrappers/wasm/demo_reader.html @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 <!DOCTYPE html>
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2 <html>
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3
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4 <head>
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5 <meta charset="utf-8">
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6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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7 <title>zxing-cpp/wasm reader demo</title>
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8 <link rel="shortcut icon" href="#" />
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9 <script src="zxing_reader.js"></script>
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10 <script>
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11 var zxing = ZXing().then(function(instance) {
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12 zxing = instance; // this line is supposedly not required but with current emsdk it is :-/
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13 });
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14
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15 async function readBarcodes() {
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16 let format = document.getElementById("format").value;
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17 let file = document.getElementById("file").files[0];
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18
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19 let arrayBuffer = await file.arrayBuffer();
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20 let u8Buffer = new Uint8Array(arrayBuffer);
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21
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22 let zxingBuffer = zxing._malloc(u8Buffer.length);
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23 zxing.HEAPU8.set(u8Buffer, zxingBuffer);
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24 let results = zxing.readBarcodesFromImage(zxingBuffer, u8Buffer.length, true, format, 0xff);
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25 zxing._free(zxingBuffer);
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26
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27 showResults(results);
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28 showImageWithResults(file, results);
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29 }
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31 function showImageWithResults(file, results) {
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32 var canvas = document.getElementById("canvas");
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33 var img = new Image()
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34 img.addEventListener('load', function() {
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35 canvas.width = img.width;
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36 canvas.height = img.height;
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37 const ctx = canvas.getContext("2d");
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38 ctx.drawImage(img, 0, 0);
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39
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40 for (let i = 0; i < results.size(); i += 1) {
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41 const { position } = results.get(i);
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42 // Draw outline square
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43 ctx.beginPath();
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44 ctx.moveTo(position.topLeft.x, position.topLeft.y);
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45 ctx.lineTo(position.topRight.x, position.topRight.y);
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46 ctx.lineTo(position.bottomRight.x, position.bottomRight.y);
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47 ctx.lineTo(position.bottomLeft.x, position.bottomLeft.y);
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48 ctx.closePath();
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49 ctx.strokeStyle = "red";
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50 ctx.lineWidth = 4;
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51 ctx.stroke();
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52
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53 // Draw number inside square
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54 const text = {
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55 text: i + 1,
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56 size: Math.abs((position.bottomRight.y - position.topLeft.y)) / 2,
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57 x: (position.topLeft.x + position.bottomRight.x) / 2.0,
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58 y: (position.topLeft.y + position.bottomRight.y) / 2.0,
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59 };
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60 ctx.fillStyle = "white";
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61 ctx.font = `bold ${text.size}px sans`;
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62 ctx.textAlign = "center";
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63 ctx.textBaseline = "middle";
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64 ctx.fillText(text.text, text.x, text.y);
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65 ctx.strokeStyle = "red";
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66 ctx.lineWidth = 2;
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67 ctx.strokeText(text.text, text.x, text.y);
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68 }
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69 });
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70 img.src = URL.createObjectURL(file)
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71 }
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72
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73 function escapeTags(htmlStr) {
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74 return htmlStr.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#39;");
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75 }
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76
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77 function u8a2hex(bytes) {
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78 return bytes.reduce((a, b) => a + b.toString(16).padStart(2, '0') + ' ', '');
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79 }
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80
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81 function showResults(results) {
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82 const resultsDiv = document.getElementById("results");
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83 resultsDiv.innerHTML = "";
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84 if (results.size() === 0) {
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85 resultsDiv.innerHTML += "No " + (document.getElementById("format").value || "barcode") + " found";
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86 }
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87 else {
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88 for (let i = 0; i < results.size(); i += 1) {
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89 const { format, text, bytes, error } = results.get(i);
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90 resultsDiv.innerHTML += "<li>Format: <strong>" + format + "</strong>"
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91 + "<pre>" + (escapeTags(text) || '<font color="red">Error: ' + error + '</font>') + "</pre>"
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92 + "<pre>" + u8a2hex(bytes) + "</pre>"
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93 + "</li>";
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94 }
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95 }
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96 }
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97 </script>
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98 </head>
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99
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100 <body style="text-align: left">
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101 <h2>zxing-cpp/wasm reader demo</h2>
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102 <p>
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103 This is a simple demo of the wasm wrapper of <a href="https://github.com/zxing-cpp/zxing-cpp">zxing-cpp</a>
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104 scanning for barcodes in image files.
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105 </p>
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106 <p></p>
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107 <div>
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108 Scan Format:
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109 <select id="format" onchange='readBarcodes()'>
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110 <option value="" selected="">Any</option>
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111 <option value="Aztec">Aztec</option>
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112 <option value="Codabar">Codabar</option>
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113 <option value="Code39">Code 39</option>
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114 <option value="Code93">Code 93</option>
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115 <option value="Code128">Code 128</option>
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116 <option value="DataMatrix">DataMatrix</option>
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117 <option value="DataBar">DataBar</option>
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118 <option value="DataBarExpanded">DataBarExpanded</option>
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119 <option value="DataBarLimited">DataBarLimited</option>
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120 <option value="DXFilmEdge">DXFilmEdge</option>
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121 <option value="EAN8">EAN-8</option>
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122 <option value="EAN13">EAN-13</option>
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123 <option value="ITF">ITF</option>
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124 <option value="PDF417">PDF417</option>
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125 <option value="QRCode">QR Code</option>
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126 <option value="MicroQRCode">Micro QRCode</option>
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127 <option value="RMQRCode">rMQR Code</option>
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128 <option value="UPCA">UPC-A</option>
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129 <option value="UPCE">UPC-E</option>
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130 <option value="LinearCodes">Linear Codes</option>
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131 <option value="MatrixCodes">Matrix Codes</option>
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132 </select>
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133
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134 &nbsp;&nbsp;
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135
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136 Image File: <input id="file" type="file" accept="image/png, image/jpeg" onchange="readBarcodes()" />
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137
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138 <br /><br />
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139
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140 <canvas id="canvas" width="640" height="480"></canvas>
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141
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142 <br /><br />
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143
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144 <ol id="results"></ol>
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145
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146 </div>
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147 </body>
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148
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149 </html>