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Use dummy font for testing when pdf fonts are loaded.

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This commit is contained in:
Brendan Dahl 2013-07-15 15:37:03 -07:00
parent 6c6719efeb
commit f04dbcaf2e
1 changed files with 95 additions and 110 deletions
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205
src/fonts.js
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@ -538,7 +538,50 @@ function mapPrivateUseChars(code) {
}
var FontLoader = {
insertRule: function fontLoaderInsertRule(rule) {
var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
if (!styleElement) {
styleElement = document.createElement('style');
styleElement.id = 'PDFJS_FONT_STYLE_TAG';
document.documentElement.getElementsByTagName('head')[0].appendChild(
styleElement);
}
var styleSheet = styleElement.sheet;
styleSheet.insertRule(rule, styleSheet.cssRules.length);
},
//#if !(MOZCENTRAL)
get loadTestFont() {
// This is a CFF font with 1 glyph for '.' that fills its entire width and
// height.
return shadow(this, 'loadTestFont', atob(
'T1RUTwALAIAAAwAwQ0ZGIDHtZg4AAAOYAAAAgUZGVE1lkzZwAAAEHAAAABxHREVGABQAFQ' +
'AABDgAAAAeT1MvMlYNYwkAAAEgAAAAYGNtYXABDQLUAAACNAAAAUJoZWFk/xVFDQAAALwA' +
'AAA2aGhlYQdkA+oAAAD0AAAAJGhtdHgD6AAAAAAEWAAAAAZtYXhwAAJQAAAAARgAAAAGbm' +
'FtZVjmdH4AAAGAAAAAsXBvc3T/hgAzAAADeAAAACAAAQAAAAEAALZRFsRfDzz1AAsD6AAA' +
'AADOBOTLAAAAAM4KHDwAAAAAA+gDIQAAAAgAAgAAAAAAAAABAAADIQAAAFoD6AAAAAAD6A' +
'ABAAAAAAAAAAAAAAAAAAAAAQAAUAAAAgAAAAQD6AH0AAUAAAKKArwAAACMAooCvAAAAeAA' +
'MQECAAACAAYJAAAAAAAAAAAAAQAAAAAAAAAAAAAAAFBmRWQAwAAuAC4DIP84AFoDIQAAAA' +
'AAAQAAAAAAAAAAACAAIAABAAAADgCuAAEAAAAAAAAAAQAAAAEAAAAAAAEAAQAAAAEAAAAA' +
'AAIAAQAAAAEAAAAAAAMAAQAAAAEAAAAAAAQAAQAAAAEAAAAAAAUAAQAAAAEAAAAAAAYAAQ' +
'AAAAMAAQQJAAAAAgABAAMAAQQJAAEAAgABAAMAAQQJAAIAAgABAAMAAQQJAAMAAgABAAMA' +
'AQQJAAQAAgABAAMAAQQJAAUAAgABAAMAAQQJAAYAAgABWABYAAAAAAAAAwAAAAMAAAAcAA' +
'EAAAAAADwAAwABAAAAHAAEACAAAAAEAAQAAQAAAC7//wAAAC7////TAAEAAAAAAAABBgAA' +
'AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAA' +
'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAA' +
'AAAAD/gwAyAAAAAQAAAAAAAAAAAAAAAAAAAAABAAQEAAEBAQJYAAEBASH4DwD4GwHEAvgc' +
'A/gXBIwMAYuL+nz5tQXkD5j3CBLnEQACAQEBIVhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWF' +
'hYWFhYWFhYAAABAQAADwACAQEEE/t3Dov6fAH6fAT+fPp8+nwHDosMCvm1Cvm1DAz6fBQA' +
'AAAAAAABAAAAAMmJbzEAAAAAzgTjFQAAAADOBOQpAAEAAAAAAAAADAAUAAQAAAABAAAAAg' +
'ABAAAAAAAAAAAD6AAAAAAAAA=='
));
},
loadTestFontId: 0,
loadingContext: {
requests: [],
nextRequestId: 0
@ -611,128 +654,79 @@ var FontLoader = {
return request;
},
// Set things up so that at least one pdfjsFontLoad event is
// dispatched when all the @font-face |rules| for |fonts| have been
// loaded in a subdocument. It's expected that the load of |rules|
// has already started in this (outer) document, so that they should
// be ordered before the load in the subdocument.
prepareFontLoadEvent: function fontLoaderPrepareFontLoadEvent(rules,
fonts,
request) {
/** Hack begin */
// There's no event when a font has finished downloading so the
// There's currently no event when a font has finished downloading so the
// following code is a dirty hack to 'guess' when a font is
// ready. This code will be obsoleted by Mozilla bug 471915.
//
// The only reliable way to know if a font is loaded in Gecko
// (at the moment) is document.onload in a document with
// a @font-face rule defined in a "static" stylesheet. We use a
// subdocument in an <iframe>, set up properly, to know when
// our @font-face rule was loaded. However, the subdocument and
// outer document can't share CSS rules, so the inner document
// is only part of the puzzle. The second piece is an invisible
// div created in order to force loading of the @font-face in
// the *outer* document. (The font still needs to be loaded for
// its metrics, for reflow). We create the div first for the
// outer document, then create the iframe. Unless something
// goes really wonkily, we expect the @font-face for the outer
// document to be processed before the inner. That's still
// fragile, but seems to work in practice.
//
// The postMessage() hackery was added to work around chrome bug
// 82402.
// ready. It's assumed fonts are loaded in order, so add a known test
// font after the desired fonts and then test for the loading of that
// test font.
var requestId = request.id;
// Validate the requestId parameter -- the value used to construct HTML.
if (!/^[\w\-]+$/.test(requestId)) {
error('Invalid request id: ' + requestId);
var canvas = document.createElement('canvas');
canvas.width = 1;
canvas.height = 1;
var ctx = canvas.getContext('2d');
// Normally the error-function throws. But if a malicious code
// intercepts the function call then the return is needed.
return;
var called = 0;
function isFontReady(name, callback) {
called++;
// With setTimeout clamping this gives the font ~100ms to load.
if(called > 30) {
warn('Load test font never loaded.');
callback();
return;
}
ctx.font = '30px ' + name;
ctx.fillText('.', 0, 20);
var imageData = ctx.getImageData(0, 0, 1, 1);
if (imageData.data[3] > 0) {
callback();
return;
}
setTimeout(isFontReady.bind(null, name, callback));
}
var loadTestFontId = 'lt' + Date.now() + this.loadTestFontId++;
// Chromium seems to cache fonts based on a hash of the actual font data,
// so the font must be modified for each load test else it will appear to
// be loaded already.
// TODO: This could maybe be made faster by avoiding the btoa of the full
// font by splitting it in chunks before hand and padding the font id.
var data = this.loadTestFont;
var COMMENT_OFFSET = 973;
var chunk1 = data.substr(0, COMMENT_OFFSET);
var chunk2 = data.substr(COMMENT_OFFSET + loadTestFontId.length);
data = chunk1 + loadTestFontId + chunk2;
var url = 'url(data:font/opentype;base64,' + btoa(data) + ');';
var rule = '@font-face { font-family:"' + loadTestFontId + '";src:' +
url + '}';
FontLoader.insertRule(rule);
var names = [];
for (var i = 0, ii = fonts.length; i < ii; i++)
names.push(fonts[i].loadedName);
// Validate the names parameter -- the values can used to construct HTML.
if (!/^\w+$/.test(names.join(''))) {
error('Invalid font name(s): ' + names.join());
// Normally the error-function throws. But if a malicious code
// intercepts the function call then the return is needed.
return;
}
names.push(loadTestFontId);
var div = document.createElement('div');
div.setAttribute('style',
'visibility: hidden;' +
'width: 10px; height: 10px;' +
'position: absolute; top: 0px; left: 0px;');
var html = '';
for (var i = 0, ii = names.length; i < ii; ++i) {
html += '<span style="font-family:' + names[i] + '">Hi</span>';
var span = document.createElement('span');
span.textContent = 'Hi';
span.style.fontFamily = names[i];
div.appendChild(span);
}
div.innerHTML = html;
document.body.appendChild(div);
window.addEventListener(
'message',
function fontLoaderMessage(e) {
if (e.data !== requestId)
return;
for (var i = 0, ii = fonts.length; i < ii; ++i) {
var font = fonts[i];
font.loading = false;
}
request.complete();
// cleanup
if (frame) {
document.body.removeChild(frame);
}
window.removeEventListener('message', fontLoaderMessage, false);
},
false);
// XXX we should have a time-out here too, and maybe fire
// pdfjsFontLoadFailed?
var src = '<!DOCTYPE HTML><html><head><meta charset="utf-8">';
src += '<style type="text/css">';
for (var i = 0, ii = rules.length; i < ii; ++i) {
src += rules[i];
}
src += '</style>';
src += '<script type="application/javascript">';
src += ' window.onload = function fontLoaderOnload() {\n';
src += ' parent.postMessage("' + requestId + '", "*");\n';
// Chrome stuck on loading (see chrome issue 145227) - resetting url
src += ' window.location = "about:blank";\n';
src += ' }';
// Hack so the end script tag isn't counted if this is inline JS.
src += '</scr' + 'ipt></head><body>';
for (var i = 0, ii = names.length; i < ii; ++i) {
src += '<p style="font-family:\'' + names[i] + '\'">Hi</p>';
}
src += '</body></html>';
var MAX_IFRAME_SRC_LENGTH = 1000000, IFRAME_TIMEOUT = 2000;
// Chrome fails for long src attributes (see issue 174023)
if (src.length > MAX_IFRAME_SRC_LENGTH) {
// ... waiting for some fixed period of time instead
window.setTimeout(function() {
window.postMessage(requestId, '*');
}, IFRAME_TIMEOUT);
return;
}
var frame = document.createElement('iframe');
frame.src = 'data:text/html,' + src;
frame.setAttribute('style',
'visibility: hidden;' +
'width: 10px; height: 10px;' +
'position: absolute; top: 0px; left: 0px;');
document.body.appendChild(frame);
isFontReady(loadTestFontId, function() {
document.body.removeChild(div);
request.complete();
});
/** Hack end */
}
//#else
@ -4570,16 +4564,7 @@ var Font = (function FontClosure() {
window.btoa(data) + ');');
var rule = '@font-face { font-family:"' + fontName + '";src:' + url + '}';
var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
if (!styleElement) {
styleElement = document.createElement('style');
styleElement.id = 'PDFJS_FONT_STYLE_TAG';
document.documentElement.getElementsByTagName('head')[0].appendChild(
styleElement);
}
var styleSheet = styleElement.sheet;
styleSheet.insertRule(rule, styleSheet.cssRules.length);
FontLoader.insertRule(rule);
if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
globalScope['FontInspector'].enabled)