Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/platform/wasm/examples/simple-viewer/worker.js @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // Copyright (C) 2022, 2024 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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23 "use strict"
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25 import * as mupdf from "../../dist/mupdf.js"
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27 const methods = {}
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29 onmessage = async function (event) {
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30 let [ func, id, args ] = event.data
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31 try {
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32 let result = methods[func](...args)
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33 postMessage([ "RESULT", id, result ])
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34 } catch (error) {
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35 postMessage([ "ERROR", id, { name: error.name, message: error.message, stack: error.stack } ])
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36 }
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37 }
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38
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39 var document_next_id = 1
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40 var document_map = {} // open mupdf.Document handles
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41
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42 class WorkerBlobStream {
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43 constructor(blob) {
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44 this.reader = new FileReaderSync()
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45 this.blob = blob
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46 }
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47 fileSize() {
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48 return this.blob.size
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49 }
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50 read(memory, offset, size, position) {
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51 let data = this.reader.readAsArrayBuffer(this.blob.slice(position, position + size))
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52 memory.set(new Uint8Array(data), offset)
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53 return data.byteLength
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54 }
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55 close() {
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56 this.reader = null
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57 this.blob = null
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58 }
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59 }
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60
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61 methods.openDocumentFromBlob = function (blob, magic) {
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62 let stm = new mupdf.Stream(new WorkerBlobStream(blob))
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63 let doc_id = document_next_id++
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64 document_map[doc_id] = mupdf.Document.openDocument(stm, magic)
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65 return doc_id
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66 }
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67
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68 methods.openDocumentFromBuffer = function (buffer, magic) {
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69 let doc_id = document_next_id++
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70 document_map[doc_id] = mupdf.Document.openDocument(buffer, magic)
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71 return doc_id
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72 }
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73
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74 methods.closeDocument = function (doc_id) {
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75 let doc = document_map[doc_id]
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76 doc.destroy()
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77 delete document_map[doc_id]
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78 }
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79
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80 methods.documentTitle = function (doc_id) {
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81 let doc = document_map[doc_id]
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82 return doc.getMetaData(mupdf.Document.META_INFO_TITLE)
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83 }
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84
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85 methods.documentOutline = function (doc_id) {
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86 let doc = document_map[doc_id]
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87 return doc.loadOutline()
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88 }
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89
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90 methods.countPages = function (doc_id) {
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91 let doc = document_map[doc_id]
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92 return doc.countPages()
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93 }
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94
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95 methods.getPageSize = function (doc_id, page_number) {
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96 let doc = document_map[doc_id]
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97 let page = doc.loadPage(page_number)
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98 let bounds = page.getBounds()
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99 return { width: bounds[2] - bounds[0], height: bounds[3] - bounds[1] }
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100 }
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parents:
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101
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parents:
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102 methods.getPageLinks = function (doc_id, page_number) {
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parents:
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103 let doc = document_map[doc_id]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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104 let page = doc.loadPage(page_number)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 let links = page.getLinks()
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parents:
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106
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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107 return links.map((link) => {
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parents:
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108 const [ x0, y0, x1, y1 ] = link.getBounds()
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parents:
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109
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parents:
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110 let href
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parents:
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111 if (link.isExternal())
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parents:
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112 href = link.getURI()
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parents:
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113 else
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114 href = `#page${doc.resolveLink(link) + 1}`
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parents:
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115
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116 return {
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117 x: x0,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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118 y: y0,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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119 w: x1 - x0,
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parents:
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120 h: y1 - y0,
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parents:
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121 href,
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parents:
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122 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 })
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 }
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parents:
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125
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126 methods.getPageText = function (doc_id, page_number) {
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127 let doc = document_map[doc_id]
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128 let page = doc.loadPage(page_number)
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parents:
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129 let text = page.toStructuredText().asJSON()
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parents:
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130 return JSON.parse(text)
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parents:
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131 }
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132
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parents:
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133 methods.search = function (doc_id, page_number, needle) {
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parents:
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134 let doc = document_map[doc_id]
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parents:
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135 let page = doc.loadPage(page_number)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 const hits = page.search(needle)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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137 let result = []
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parents:
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138 for (let hit of hits) {
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parents:
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139 for (let quad of hit) {
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140 const [ ulx, uly, urx, ury, llx, lly, lrx, lry ] = quad
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parents:
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141 result.push({
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parents:
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142 x: ulx,
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parents:
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143 y: uly,
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parents:
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144 w: urx - ulx,
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parents:
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145 h: lly - uly,
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parents:
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146 })
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parents:
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147 }
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parents:
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148 }
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parents:
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149 return result
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parents:
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150 }
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parents:
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151
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parents:
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152 methods.getPageAnnotations = function (doc_id, page_number, dpi) {
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parents:
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153 let doc = document_map[doc_id]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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154 let page = doc.loadPage(page_number)
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parents:
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155
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parents:
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156 if (page == null) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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157 return []
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parents:
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158 }
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parents:
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159
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 const annotations = page.getAnnotations()
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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161 const doc_to_screen = [ dpi = 72, 0, 0, dpi / 72, 0, 0 ]
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parents:
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162
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 return annotations.map((annotation) => {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 const [ x0, y0, x1, y1 ] = mupdf.Matrix.transformRect(annotation.getBounds())
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parents:
diff changeset
165 return {
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parents:
diff changeset
166 x: x0,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 y: y0,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 w: x1 - x0,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 h: y1 - y0,
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parents:
diff changeset
170 type: annotation.getType(),
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 ref: annotation.pointer,
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parents:
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172 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 })
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 }
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parents:
diff changeset
175
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 methods.drawPageAsPixmap = function (doc_id, page_number, dpi) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 const doc_to_screen = mupdf.Matrix.scale(dpi / 72, dpi / 72)
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parents:
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178
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parents:
diff changeset
179 let doc = document_map[doc_id]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 let page = doc.loadPage(page_number)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 let bbox = mupdf.Rect.transform(page.getBounds(), doc_to_screen)
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parents:
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182
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 let pixmap = new mupdf.Pixmap(mupdf.ColorSpace.DeviceRGB, bbox, true)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 pixmap.clear(255)
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parents:
diff changeset
185
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 let device = new mupdf.DrawDevice(doc_to_screen, pixmap)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 page.run(device, mupdf.Matrix.identity)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 device.close()
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parents:
diff changeset
189
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parents:
diff changeset
190 // TODO: do we need to make a copy with slice() ?
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 let imageData = new ImageData(pixmap.getPixels().slice(), pixmap.getWidth(), pixmap.getHeight())
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parents:
diff changeset
192
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 pixmap.destroy()
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parents:
diff changeset
194
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parents:
diff changeset
195 // TODO: do we need to pass image data as transferable to avoid copying?
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 return imageData
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parents:
diff changeset
197 }
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parents:
diff changeset
198
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 postMessage([ "INIT", 0, Object.keys(methods) ])