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21 |
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22 | "use strict";
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23 |
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24 | Object.defineProperty(exports, "__esModule", {
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25 | value: true
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26 | });
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27 | exports.TempImageFactory = exports.PDFThumbnailView = void 0;
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28 |
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29 | var _ui_utils = require("./ui_utils.js");
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30 |
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31 | var _pdf = require("../pdf");
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32 |
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33 | const DRAW_UPSCALE_FACTOR = 2;
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34 | const MAX_NUM_SCALING_STEPS = 3;
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35 | const THUMBNAIL_CANVAS_BORDER_WIDTH = 1;
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36 | const THUMBNAIL_WIDTH = 98;
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37 |
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38 | class TempImageFactory {
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39 | static #tempCanvas = null;
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40 |
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41 | static getCanvas(width, height) {
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42 | const tempCanvas = this.#tempCanvas ||= document.createElement("canvas");
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43 | tempCanvas.width = width;
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44 | tempCanvas.height = height;
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45 | const ctx = tempCanvas.getContext("2d", {
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46 | alpha: false
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47 | });
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48 | ctx.save();
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49 | ctx.fillStyle = "rgb(255, 255, 255)";
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50 | ctx.fillRect(0, 0, width, height);
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51 | ctx.restore();
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52 | return [tempCanvas, tempCanvas.getContext("2d")];
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53 | }
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54 |
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55 | static destroyCanvas() {
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56 | const tempCanvas = this.#tempCanvas;
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57 |
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58 | if (tempCanvas) {
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59 | tempCanvas.width = 0;
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60 | tempCanvas.height = 0;
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61 | }
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62 |
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63 | this.#tempCanvas = null;
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64 | }
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65 |
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66 | }
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67 |
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68 | exports.TempImageFactory = TempImageFactory;
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69 |
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70 | class PDFThumbnailView {
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71 | constructor({
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72 | container,
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73 | id,
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74 | defaultViewport,
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75 | optionalContentConfigPromise,
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76 | linkService,
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77 | renderingQueue,
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78 | l10n,
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79 | pageColors
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80 | }) {
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81 | this.id = id;
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82 | this.renderingId = "thumbnail" + id;
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83 | this.pageLabel = null;
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84 | this.pdfPage = null;
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85 | this.rotation = 0;
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86 | this.viewport = defaultViewport;
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87 | this.pdfPageRotate = defaultViewport.rotation;
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88 | this._optionalContentConfigPromise = optionalContentConfigPromise || null;
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89 | this.pageColors = pageColors || null;
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90 | this.linkService = linkService;
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91 | this.renderingQueue = renderingQueue;
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92 | this.renderTask = null;
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93 | this.renderingState = _ui_utils.RenderingStates.INITIAL;
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94 | this.resume = null;
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95 | const pageWidth = this.viewport.width,
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96 | pageHeight = this.viewport.height,
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97 | pageRatio = pageWidth / pageHeight;
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98 | this.canvasWidth = THUMBNAIL_WIDTH;
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99 | this.canvasHeight = this.canvasWidth / pageRatio | 0;
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100 | this.scale = this.canvasWidth / pageWidth;
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101 | this.l10n = l10n;
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102 | const anchor = document.createElement("a");
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103 | anchor.href = linkService.getAnchorUrl("#page=" + id);
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104 |
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105 | this._thumbPageTitle.then(msg => {
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106 | anchor.title = msg;
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107 | });
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108 |
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109 | anchor.onclick = function () {
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110 | linkService.goToPage(id);
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111 | return false;
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112 | };
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113 |
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114 | this.anchor = anchor;
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115 | const div = document.createElement("div");
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116 | div.className = "thumbnail";
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117 | div.setAttribute("data-page-number", this.id);
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118 | this.div = div;
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119 | const ring = document.createElement("div");
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120 | ring.className = "thumbnailSelectionRing";
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121 | const borderAdjustment = 2 * THUMBNAIL_CANVAS_BORDER_WIDTH;
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122 | ring.style.width = this.canvasWidth + borderAdjustment + "px";
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123 | ring.style.height = this.canvasHeight + borderAdjustment + "px";
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124 | this.ring = ring;
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125 | div.append(ring);
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126 | anchor.append(div);
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127 | container.append(anchor);
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128 | }
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129 |
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130 | setPdfPage(pdfPage) {
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131 | this.pdfPage = pdfPage;
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132 | this.pdfPageRotate = pdfPage.rotate;
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133 | const totalRotation = (this.rotation + this.pdfPageRotate) % 360;
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134 | this.viewport = pdfPage.getViewport({
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135 | scale: 1,
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136 | rotation: totalRotation
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137 | });
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138 | this.reset();
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139 | }
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140 |
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141 | reset() {
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142 | this.cancelRendering();
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143 | this.renderingState = _ui_utils.RenderingStates.INITIAL;
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144 | const pageWidth = this.viewport.width,
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145 | pageHeight = this.viewport.height,
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146 | pageRatio = pageWidth / pageHeight;
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147 | this.canvasHeight = this.canvasWidth / pageRatio | 0;
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148 | this.scale = this.canvasWidth / pageWidth;
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149 | this.div.removeAttribute("data-loaded");
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150 | const ring = this.ring;
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151 | ring.textContent = "";
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152 | const borderAdjustment = 2 * THUMBNAIL_CANVAS_BORDER_WIDTH;
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153 | ring.style.width = this.canvasWidth + borderAdjustment + "px";
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154 | ring.style.height = this.canvasHeight + borderAdjustment + "px";
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155 |
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156 | if (this.canvas) {
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157 | this.canvas.width = 0;
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158 | this.canvas.height = 0;
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159 | delete this.canvas;
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160 | }
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161 |
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162 | if (this.image) {
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163 | this.image.removeAttribute("src");
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164 | delete this.image;
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165 | }
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166 | }
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167 |
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168 | update({
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169 | rotation = null
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170 | }) {
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171 | if (typeof rotation === "number") {
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172 | this.rotation = rotation;
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173 | }
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174 |
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175 | const totalRotation = (this.rotation + this.pdfPageRotate) % 360;
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176 | this.viewport = this.viewport.clone({
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177 | scale: 1,
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178 | rotation: totalRotation
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179 | });
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180 | this.reset();
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181 | }
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182 |
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183 | cancelRendering() {
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184 | if (this.renderTask) {
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185 | this.renderTask.cancel();
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186 | this.renderTask = null;
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187 | }
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188 |
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189 | this.resume = null;
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190 | }
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191 |
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192 | _getPageDrawContext(upscaleFactor = 1) {
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193 | const canvas = document.createElement("canvas");
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194 | const ctx = canvas.getContext("2d", {
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195 | alpha: false
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196 | });
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197 | const outputScale = new _ui_utils.OutputScale();
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198 | canvas.width = upscaleFactor * this.canvasWidth * outputScale.sx | 0;
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199 | canvas.height = upscaleFactor * this.canvasHeight * outputScale.sy | 0;
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200 | const transform = outputScale.scaled ? [outputScale.sx, 0, 0, outputScale.sy, 0, 0] : null;
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201 | return {
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202 | ctx,
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203 | canvas,
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204 | transform
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205 | };
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206 | }
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207 |
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208 | _convertCanvasToImage(canvas) {
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209 | if (this.renderingState !== _ui_utils.RenderingStates.FINISHED) {
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210 | throw new Error("_convertCanvasToImage: Rendering has not finished.");
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211 | }
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212 |
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213 | const reducedCanvas = this._reduceImage(canvas);
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214 |
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215 | const image = document.createElement("img");
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216 | image.className = "thumbnailImage";
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217 |
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218 | this._thumbPageCanvas.then(msg => {
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219 | image.setAttribute("aria-label", msg);
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220 | });
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221 |
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222 | image.style.width = this.canvasWidth + "px";
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223 | image.style.height = this.canvasHeight + "px";
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224 | image.src = reducedCanvas.toDataURL();
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225 | this.image = image;
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226 | this.div.setAttribute("data-loaded", true);
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227 | this.ring.append(image);
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228 | reducedCanvas.width = 0;
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229 | reducedCanvas.height = 0;
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230 | }
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231 |
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232 | draw() {
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233 | if (this.renderingState !== _ui_utils.RenderingStates.INITIAL) {
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234 | console.error("Must be in new state before drawing");
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235 | return Promise.resolve();
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236 | }
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237 |
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238 | const {
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239 | pdfPage
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240 | } = this;
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241 |
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242 | if (!pdfPage) {
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243 | this.renderingState = _ui_utils.RenderingStates.FINISHED;
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244 | return Promise.reject(new Error("pdfPage is not loaded"));
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245 | }
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246 |
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247 | this.renderingState = _ui_utils.RenderingStates.RUNNING;
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248 |
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249 | const finishRenderTask = async (error = null) => {
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250 | if (renderTask === this.renderTask) {
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251 | this.renderTask = null;
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252 | }
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253 |
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254 | if (error instanceof _pdf.RenderingCancelledException) {
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255 | return;
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256 | }
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257 |
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258 | this.renderingState = _ui_utils.RenderingStates.FINISHED;
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259 |
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260 | this._convertCanvasToImage(canvas);
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261 |
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262 | if (error) {
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263 | throw error;
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264 | }
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265 | };
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266 |
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267 | const {
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268 | ctx,
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269 | canvas,
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270 | transform
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271 | } = this._getPageDrawContext(DRAW_UPSCALE_FACTOR);
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272 |
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273 | const drawViewport = this.viewport.clone({
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274 | scale: DRAW_UPSCALE_FACTOR * this.scale
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275 | });
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276 |
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277 | const renderContinueCallback = cont => {
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278 | if (!this.renderingQueue.isHighestPriority(this)) {
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279 | this.renderingState = _ui_utils.RenderingStates.PAUSED;
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280 |
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281 | this.resume = () => {
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282 | this.renderingState = _ui_utils.RenderingStates.RUNNING;
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283 | cont();
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284 | };
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285 |
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286 | return;
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287 | }
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288 |
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289 | cont();
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290 | };
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291 |
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292 | const renderContext = {
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293 | canvasContext: ctx,
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294 | transform,
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295 | viewport: drawViewport,
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296 | optionalContentConfigPromise: this._optionalContentConfigPromise,
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297 | pageColors: this.pageColors
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298 | };
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299 | const renderTask = this.renderTask = pdfPage.render(renderContext);
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300 | renderTask.onContinue = renderContinueCallback;
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301 | const resultPromise = renderTask.promise.then(function () {
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302 | return finishRenderTask(null);
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303 | }, function (error) {
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304 | return finishRenderTask(error);
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305 | });
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306 | resultPromise.finally(() => {
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307 | canvas.width = 0;
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308 | canvas.height = 0;
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309 | const pageCached = this.linkService.isPageCached(this.id);
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310 |
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311 | if (!pageCached) {
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312 | this.pdfPage?.cleanup();
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313 | }
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314 | });
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315 | return resultPromise;
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316 | }
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317 |
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318 | setImage(pageView) {
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319 | if (this.renderingState !== _ui_utils.RenderingStates.INITIAL) {
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320 | return;
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321 | }
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322 |
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323 | const {
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324 | thumbnailCanvas: canvas,
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325 | pdfPage
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326 | } = pageView;
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327 |
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328 | if (!canvas) {
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329 | return;
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330 | }
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331 |
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332 | if (!this.pdfPage) {
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333 | this.setPdfPage(pdfPage);
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334 | }
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335 |
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336 | this.renderingState = _ui_utils.RenderingStates.FINISHED;
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337 |
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338 | this._convertCanvasToImage(canvas);
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339 | }
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340 |
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341 | _reduceImage(img) {
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342 | const {
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343 | ctx,
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344 | canvas
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345 | } = this._getPageDrawContext();
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346 |
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347 | if (img.width <= 2 * canvas.width) {
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348 | ctx.drawImage(img, 0, 0, img.width, img.height, 0, 0, canvas.width, canvas.height);
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349 | return canvas;
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350 | }
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351 |
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352 | let reducedWidth = canvas.width << MAX_NUM_SCALING_STEPS;
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353 | let reducedHeight = canvas.height << MAX_NUM_SCALING_STEPS;
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354 | const [reducedImage, reducedImageCtx] = TempImageFactory.getCanvas(reducedWidth, reducedHeight);
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355 |
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356 | while (reducedWidth > img.width || reducedHeight > img.height) {
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357 | reducedWidth >>= 1;
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358 | reducedHeight >>= 1;
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359 | }
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360 |
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361 | reducedImageCtx.drawImage(img, 0, 0, img.width, img.height, 0, 0, reducedWidth, reducedHeight);
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362 |
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363 | while (reducedWidth > 2 * canvas.width) {
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364 | reducedImageCtx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight, 0, 0, reducedWidth >> 1, reducedHeight >> 1);
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365 | reducedWidth >>= 1;
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366 | reducedHeight >>= 1;
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367 | }
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368 |
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369 | ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight, 0, 0, canvas.width, canvas.height);
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370 | return canvas;
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371 | }
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372 |
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373 | get _thumbPageTitle() {
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374 | return this.l10n.get("thumb_page_title", {
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375 | page: this.pageLabel ?? this.id
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376 | });
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377 | }
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378 |
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379 | get _thumbPageCanvas() {
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380 | return this.l10n.get("thumb_page_canvas", {
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381 | page: this.pageLabel ?? this.id
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382 | });
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383 | }
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384 |
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385 | setPageLabel(label) {
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386 | this.pageLabel = typeof label === "string" ? label : null;
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387 |
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388 | this._thumbPageTitle.then(msg => {
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389 | this.anchor.title = msg;
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390 | });
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391 |
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392 | if (this.renderingState !== _ui_utils.RenderingStates.FINISHED) {
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393 | return;
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394 | }
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395 |
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396 | this._thumbPageCanvas.then(msg => {
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397 | this.image?.setAttribute("aria-label", msg);
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398 | });
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399 | }
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400 |
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401 | }
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402 |
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403 | exports.PDFThumbnailView = PDFThumbnailView; |
\ | No newline at end of file |