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Use Font.prototype.bindDOM to insert fonts on page

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This commit is contained in:
Julian Viereck 2011-06-28 09:51:49 +02:00
parent 519fb435c3
commit 803139127a
1 changed files with 25 additions and 34 deletions
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57
worker/client.js
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@ -33,9 +33,24 @@ function FontWorker() {
throw "Unkown action from worker: " + data.action; throw "Unkown action from worker: " + data.action;
} }
}.bind(this); }.bind(this);
this.$handleFontLoadedCallback = this.handleFontLoadedCallback.bind(this);
} }
FontWorker.prototype = { FontWorker.prototype = {
handleFontLoadedCallback: function() {
// Decrease the number of fonts wainting to be loaded.
this.fontsWaiting--;
// If all fonts are available now, then call all the callbacks.
if (this.fontsWaiting == 0) {
var callbacks = this.fontsWaitingCallbacks;
for (var i = 0; i < callbacks.length; i++) {
callbacks[i]();
}
this.fontsWaitingCallbacks.length = 0;
}
},
actionHandler: { actionHandler: {
"log": function(data) { "log": function(data) {
console.log.apply(console, data); console.log.apply(console, data);
@ -48,41 +63,15 @@ FontWorker.prototype = {
Fonts[name].properties = { Fonts[name].properties = {
encoding: data[name].encoding encoding: data[name].encoding
} }
var base64 = window.btoa(data[name].str);
// Add the @font-face rule to the document // Call `Font.prototype.bindDOM` to make the font get loaded on the page.
var url = "url(data:font/opentype;base64," + base64 + ");"; Font.prototype.bindDOM.call(
var rule = "@font-face { font-family:'" + name + "';src:" + url + "}"; Fonts[name],
var styleSheet = document.styleSheets[0]; data[name].str,
styleSheet.insertRule(rule, styleSheet.length); // IsLoadedCallback.
this.$handleFontLoadedCallback
// Just adding the font-face to the DOM doesn't make it load. It );
// seems it's loaded once Gecko notices it's used. Therefore,
// add a div on the page using the loaded font.
var div = document.createElement("div");
var style = 'font-family:"' + name +
'";position: absolute;top:-99999;left:-99999;z-index:-99999';
div.setAttribute("style", style);
document.body.appendChild(div);
this.fontsWaiting --;
} }
if (this.fontsWaiting == 0) {
console.timeEnd("ensureFonts");
}
// This timeout is necessary right now to make sure the fonts are really
// loaded at the point the callbacks are called.
setTimeout(function() {
// If all fonts are available now, then call all the callbacks.
if (this.fontsWaiting == 0) {
var callbacks = this.fontsWaitingCallbacks;
for (var i = 0; i < callbacks.length; i++) {
callbacks[i]();
}
this.fontsWaitingCallbacks.length = 0;
}
}.bind(this), 100);
} }
}, },
@ -98,6 +87,8 @@ FontWorker.prototype = {
// Store only the data on Fonts that is needed later on, such that we // Store only the data on Fonts that is needed later on, such that we
// hold track on as lease memory as possible. // hold track on as lease memory as possible.
Fonts[font.name] = { Fonts[font.name] = {
name: font.name,
mimetype: font.mimetype,
// This is set later on the worker replay. For some fonts, the encoding // This is set later on the worker replay. For some fonts, the encoding
// is calculated during the conversion process happening on the worker // is calculated during the conversion process happening on the worker
// and therefore is not available right now. // and therefore is not available right now.