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-/**
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- * Code extracted from pdf.js' viewer.js file. This contains code that is relevant to building the text overlays. I
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- * have removed dependencies on viewer.js and viewer.html.
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- *
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- * -- Vivin Suresh Paliath (http://vivin.net)
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- */
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-
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-var CustomStyle = (function CustomStyleClosure() {
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-
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- // As noted on: http://www.zachstronaut.com/posts/2009/02/17/
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- // animate-css-transforms-firefox-webkit.html
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- // in some versions of IE9 it is critical that ms appear in this list
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- // before Moz
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- var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
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- var _cache = { };
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-
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- function CustomStyle() {
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- }
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-
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- CustomStyle.getProp = function get(propName, element) {
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- // check cache only when no element is given
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- if (arguments.length == 1 && typeof _cache[propName] == 'string') {
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- return _cache[propName];
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- }
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-
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- element = element || document.documentElement;
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- var style = element.style, prefixed, uPropName;
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-
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- // test standard property first
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- if (typeof style[propName] == 'string') {
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- return (_cache[propName] = propName);
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- }
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-
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- // capitalize
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- uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
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-
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- // test vendor specific properties
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- for (var i = 0, l = prefixes.length; i < l; i++) {
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- prefixed = prefixes[i] + uPropName;
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- if (typeof style[prefixed] == 'string') {
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- return (_cache[propName] = prefixed);
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- }
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- }
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-
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- //if all fails then set to undefined
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- return (_cache[propName] = 'undefined');
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- };
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-
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- CustomStyle.setProp = function set(propName, element, str) {
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- var prop = this.getProp(propName);
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- if (prop != 'undefined')
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- element.style[prop] = str;
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- };
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-
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- return CustomStyle;
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-})();
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-
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-var TextLayerBuilder = function textLayerBuilder(textLayerDiv, pageIdx) {
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- var textLayerFrag = document.createDocumentFragment();
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-
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- this.textLayerDiv = textLayerDiv;
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- this.layoutDone = false;
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- this.divContentDone = false;
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- this.pageIdx = pageIdx;
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- this.matches = [];
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-
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- this.beginLayout = function textLayerBuilderBeginLayout() {
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- this.textDivs = [];
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- this.renderingDone = false;
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- };
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-
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- this.endLayout = function textLayerBuilderEndLayout() {
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- this.layoutDone = true;
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- this.insertDivContent();
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- };
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-
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- this.renderLayer = function textLayerBuilderRenderLayer() {
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- var textDivs = this.textDivs;
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- var bidiTexts = this.textContent.bidiTexts;
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- var textLayerDiv = this.textLayerDiv;
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- var canvas = document.createElement('canvas');
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- var ctx = canvas.getContext('2d');
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-
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- // No point in rendering so many divs as it'd make the browser unusable
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- // even after the divs are rendered
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- var MAX_TEXT_DIVS_TO_RENDER = 100000;
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- if (textDivs.length > MAX_TEXT_DIVS_TO_RENDER)
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- return;
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-
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- for (var i = 0, ii = textDivs.length; i < ii; i++) {
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- var textDiv = textDivs[i];
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- if ('isWhitespace' in textDiv.dataset) {
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- continue;
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- }
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- textLayerFrag.appendChild(textDiv);
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-
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- ctx.font = textDiv.style.fontSize + ' ' + textDiv.style.fontFamily;
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- var width = ctx.measureText(textDiv.textContent).width;
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-
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- if (width > 0) {
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- var textScale = textDiv.dataset.canvasWidth / width;
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-
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- var transform = 'scale(' + textScale + ', 1)';
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- if (bidiTexts[i].dir === 'ttb') {
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- transform = 'rotate(90deg) ' + transform;
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- }
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- CustomStyle.setProp('transform', textDiv, transform);
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- CustomStyle.setProp('transformOrigin', textDiv, '0% 0%');
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-
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- textLayerDiv.appendChild(textDiv);
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- }
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- }
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-
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- this.renderingDone = true;
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-
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- textLayerDiv.appendChild(textLayerFrag);
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- };
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-
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- this.setupRenderLayoutTimer = function textLayerSetupRenderLayoutTimer() {
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- // Schedule renderLayout() if user has been scrolling, otherwise
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- // run it right away
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- var RENDER_DELAY = 200; // in ms
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- var self = this;
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- //0 was originally PDFView.lastScroll
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- if (Date.now() - 0 > RENDER_DELAY) {
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- // Render right away
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- this.renderLayer();
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- } else {
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- // Schedule
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- if (this.renderTimer)
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- clearTimeout(this.renderTimer);
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- this.renderTimer = setTimeout(function () {
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- self.setupRenderLayoutTimer();
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- }, RENDER_DELAY);
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- }
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- };
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-
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- this.appendText = function textLayerBuilderAppendText(geom) {
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- var textDiv = document.createElement('div');
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-
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- // vScale and hScale already contain the scaling to pixel units
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- var fontHeight = geom.fontSize * Math.abs(geom.vScale);
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- textDiv.dataset.canvasWidth = geom.canvasWidth * geom.hScale;
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- textDiv.dataset.fontName = geom.fontName;
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-
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- textDiv.style.fontSize = fontHeight + 'px';
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- textDiv.style.fontFamily = geom.fontFamily;
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- textDiv.style.left = geom.x + 'px';
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- textDiv.style.top = (geom.y - fontHeight) + 'px';
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-
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- // The content of the div is set in the `setTextContent` function.
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-
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- this.textDivs.push(textDiv);
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- };
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-
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- this.insertDivContent = function textLayerUpdateTextContent() {
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- // Only set the content of the divs once layout has finished, the content
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- // for the divs is available and content is not yet set on the divs.
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- if (!this.layoutDone || this.divContentDone || !this.textContent)
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- return;
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-
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- this.divContentDone = true;
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-
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- var textDivs = this.textDivs;
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- var bidiTexts = this.textContent.bidiTexts;
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-
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- for (var i = 0; i < bidiTexts.length; i++) {
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- var bidiText = bidiTexts[i];
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- var textDiv = textDivs[i];
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- if (!/\S/.test(bidiText.str)) {
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- textDiv.dataset.isWhitespace = true;
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- continue;
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- }
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-
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- textDiv.textContent = bidiText.str;
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- // bidiText.dir may be 'ttb' for vertical texts.
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- textDiv.dir = bidiText.dir === 'rtl' ? 'rtl' : 'ltr';
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- }
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-
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- this.setupRenderLayoutTimer();
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- };
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-
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- this.setTextContent = function textLayerBuilderSetTextContent(textContent) {
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- this.textContent = textContent;
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- this.insertDivContent();
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- };
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-};
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-
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-/**
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- * Returns scale factor for the canvas. It makes sense for the HiDPI displays.
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- * @return {Object} The object with horizontal (sx) and vertical (sy)
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- scales. The scaled property is set to false if scaling is
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- not required, true otherwise.
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- */
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-function getOutputScale() {
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- var pixelRatio = 'devicePixelRatio' in window ? window.devicePixelRatio : 1;
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- return {
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- sx: pixelRatio,
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- sy: pixelRatio,
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- scaled: pixelRatio != 1
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- };
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-}
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bscheibel