200 lines
7.6 KiB
JavaScript
200 lines
7.6 KiB
JavaScript
/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/*************************************************************
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*
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* MathJax/jax/output/HTML-CSS/imageFonts.js
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*
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* Implements the image fallback fonts for the HTML-CSS OutputJax.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2009-2013 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function (HUB,HTMLCSS,AJAX) {
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var VERSION = "2.3";
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HUB.Register.LoadHook(HTMLCSS.fontDir + "/fontdata.js",function () {
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HTMLCSS.Augment({
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allowWebFonts: false,
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imgDir: HTMLCSS.webfontDir+"/png",
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imgPacked: (MathJax.isPacked ? "" : "/unpacked"),
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imgSize: ['050','060','071','085',100,120,141,168,200,238,283,336,400,476],
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imgBaseIndex: 4, // set by initImg()
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imgSizeForEm: {}, // cache of indexes by em-size
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imgSizeForScale: {}, // cache of indexes by scale for a given em-size
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imgZoom: 1, // set by initImg for each equation
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handleImg: function (span,font,c,n,text) {
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if (text.length) {this.addText(span,text)}
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var orig = c[5].orig; if (!orig) {orig = c[5].orig = [c[0],c[1],c[2],c[3],c[4]]}
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var bscale = this.imgZoom; if (!span.scale) {span.scale = 1}
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var index = this.imgIndex(span.scale*bscale);
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if (index == this.imgEmWidth.length-1 &&
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this.em*span.scale*bscale/this.imgEmWidth[index] > 1.1)
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{bscale = this.imgEmWidth[index]/(this.em*span.scale)}
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var factor = this.imgEmWidth[index]/(this.em*(span.scale||1)*bscale);
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c[0] = orig[0]*factor; c[1] = orig[1]*factor; c[2] = orig[2]*factor;
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c[3] = orig[3]*factor; c[4] = orig[4]*factor;
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var dir = this.imgDir+"/"+font.directory+"/"+this.imgSize[index];
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var chr = n.toString(16).toUpperCase(); while (chr.length < 4) {chr = "0"+chr};
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var file = dir+"/"+chr+".png";
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var img = c[5].img[index];
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var style = {width:Math.floor(img[0]/bscale+.5)+"px", height:Math.floor(img[1]/bscale+.5)+"px"};
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if (img[2]) {style.verticalAlign = Math.floor(-img[2]/bscale+.5)+"px"}
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if (c[3] < 0) {style.marginLeft = this.Em(c[3]/1000)}
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if (c[4] != c[2]) {style.marginRight = this.Em((c[2]-c[4])/1000)}
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if (this.msieIE6) {
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style.filter = "progid:DXImageTransform.Microsoft." +
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"AlphaImageLoader(src='"+AJAX.fileURL(file)+"', sizingMethod='scale')";
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file = this.directory+"/blank.gif"
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}
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this.addElement(span,"img",{src:AJAX.fileURL(file), style:style, isMathJax:true});
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return "";
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},
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defineImageData: function (def) {
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for (var font in def) {if (def.hasOwnProperty(font)) {
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var FONT = HTMLCSS.FONTDATA.FONTS[font];
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if (FONT) {
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font = def[font];
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for (var n in font) {if (font.hasOwnProperty(n) && FONT[n]) {FONT[n][5] = {img: font[n]}}}
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}
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}}
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},
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initImg: function (span) {
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if (this.imgSizeForEm[this.em]) {this.imgBaseIndex = this.imgSizeForEm[this.em]}
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for (var i = 0, m = this.imgEmWidth.length-1; i < m; i++)
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{if (this.em <= this.imgEmWidth[i]) break}
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if (i && this.imgEmWidth[i] - this.em > this.em - this.imgEmWidth[i-1]) {i--}
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this.imgSizeForEm[this.em] = this.imgBaseIndex = i;
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this.imgZoom = this.imgBrowserZoom();
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},
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imgIndex: function (scale) {
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if (!scale) {return this.imgBaseIndex}
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if (!this.imgSizeForScale[this.em]) {this.imgSizeForScale[this.em] = {}}
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if (this.imgSizeForScale[this.em][scale]) {return this.imgSizeForScale[this.em][scale]}
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var em = this.em * scale;
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for (var i = 0, m = this.imgEmWidth.length-1; i < m; i++)
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{if (em <= this.imgEmWidth[i]) break}
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if (i && this.imgEmWidth[i] - em > em - this.imgEmWidth[i-1]) {i--}
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this.imgSizeForScale[this.em][scale] = i;
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return i;
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},
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imgBrowserZoom: function () {return 1}
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});
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HUB.Browser.Select({
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Firefox: function (browser) {
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var ZDIV = HTMLCSS.addElement(document.body,"div",{
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style: {
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display:"none", visibility:"hidden", overflow:"scroll",
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position:"absolute", top:0, left: 0, width:"200px", height:"200px",
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padding:0, border:0, margin:0
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}
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});
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var ZFRAME = HTMLCSS.addElement(ZDIV,"div",{
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style: {
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position:"absolute", left:0, top:0, right:0, bottom:0,
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padding:0, border:0, margin:0
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}
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});
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HTMLCSS.Augment({
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imgSpaceBug: true,
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imgSpace: "\u00A0",
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imgZoomLevel: (browser.isMac ?
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{50:.3, 30:.5, 22:.67, 19:.8, 16:.9, 15:1, 13:1.1, 12:1.2,
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11:1.33, 10:1.5, 9:1.7, 7:2, 6:2.4, 5:3, 0:15} :
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{56:.3, 34:.5, 25:.67, 21:.8, 19:.9, 17:1, 15:1.1, 14:1.2,
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13:1.33, 11:1.5, 10:1.7, 8:2, 7:2.4, 6:3, 0:17}
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),
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imgZoomDiv: ZDIV,
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imgBrowserZoom: function () {
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var size = this.imgZoomLevel;
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ZDIV.style.display = "";
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var ratio = (ZDIV.offsetWidth-ZFRAME.offsetWidth);
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ratio = (size[ratio] ? size[ratio] : size[0]/ratio);
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ZDIV.style.display = "none";
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return ratio;
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}
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});
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},
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Safari: function (browser) {
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// for iPhone and iTouch
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// var webkit = (navigator.appVersion+"AppleWebKit/530").match(/AppleWebKit\/(\d+)/)[1];
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HTMLCSS.Augment({
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// imgHeightBug: (!browser.isMac || webkit > 525),
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// imgDepthBug: (!browser.isMac || webkit > 525),
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imgBrowserZoom: function () {return 3}
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});
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},
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Chrome: function (browser) {
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HTMLCSS.Augment({
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imgHeightBug: true,
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imgBrowserZoom: function () {return 3}
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});
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},
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Opera: function (browser) {
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HTMLCSS.Augment({
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imgSpaceBug: true,
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imgSpace: "\u00A0\u00A0",
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imgDoc: (document.compatMode == "BackCompat" ? document.body :
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document.documentElement),
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imgBrowserZoom: function () {
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if (browser.isMac) {return 3} // Mac Opera scales very nicely
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var H = this.imgDoc.clientHeight, d = Math.floor(15*H/window.innerHeight);
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if (this.imgDoc.clientWidth < this.imgDoc.scrollWidth-d) {H += d}
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return parseFloat((window.innerHeight/H).toFixed(1));
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}
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});
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}
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});
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var GETWIDTHS = function () {
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var img = HTMLCSS.FONTDATA.FONTS["MathJax_Main"][0x2014][5].img; // em-dash
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HTMLCSS.imgEmWidth = [];
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for (var i = 0, m = img.length; i < m; i++) {HTMLCSS.imgEmWidth[i] = img[i][0]}
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};
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var IMGDIR = HTMLCSS.imgDir + HTMLCSS.imgPacked;
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MathJax.Callback.Queue(
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["Require",AJAX,IMGDIR+"/imagedata.js"],
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GETWIDTHS,
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["loadComplete",AJAX,HTMLCSS.directory+"/imageFonts.js"]
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);
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});
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})(MathJax.Hub,MathJax.OutputJax["HTML-CSS"],MathJax.Ajax);
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