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Convert FontFaceObject to an ES6 class

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Also changes `var` to `let`/`const` in code already touched in the patch, and makes use of template strings in a few spots.
This commit is contained in:
Jonas Jenwald 2018-08-16 20:34:31 +02:00
parent b40fb3814a
commit caf90ff6ee
1 changed files with 82 additions and 94 deletions
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176
src/display/font_loader.js
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@ -330,21 +330,21 @@ if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('MOZCENTRAL || CHROME')) {
});
}
var IsEvalSupportedCached = {
const IsEvalSupportedCached = {
get value() {
return shadow(this, 'value', isEvalSupported());
},
};
var FontFaceObject = (function FontFaceObjectClosure() {
function FontFaceObject(translatedData, { isEvalSupported = true,
disableFontFace = false,
ignoreErrors = false,
onUnsupportedFeature = null,
fontRegistry = null, }) {
class FontFaceObject {
constructor(translatedData, { isEvalSupported = true,
disableFontFace = false,
ignoreErrors = false,
onUnsupportedFeature = null,
fontRegistry = null, }) {
this.compiledGlyphs = Object.create(null);
// importing translated data
for (var i in translatedData) {
for (let i in translatedData) {
this[i] = translatedData[i];
}
this.isEvalSupported = isEvalSupported !== false;
@ -353,98 +353,86 @@ var FontFaceObject = (function FontFaceObjectClosure() {
this._onUnsupportedFeature = onUnsupportedFeature;
this.fontRegistry = fontRegistry;
}
FontFaceObject.prototype = {
createNativeFontFace: function FontFaceObject_createNativeFontFace() {
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('MOZCENTRAL')) {
throw new Error('Not implemented: createNativeFontFace');
createNativeFontFace() {
if (!this.data || this.disableFontFace) {
return null;
}
const nativeFontFace = new FontFace(this.loadedName, this.data, {});
if (this.fontRegistry) {
this.fontRegistry.registerFont(this);
}
return nativeFontFace;
}
createFontFaceRule() {
if (!this.data || this.disableFontFace) {
return null;
}
const data = bytesToString(new Uint8Array(this.data));
// Add the @font-face rule to the document.
const url = `url(data:${this.mimetype};base64,${btoa(data)});`;
const rule = `@font-face {font-family:"${this.loadedName}";src:${url}}`;
if (this.fontRegistry) {
this.fontRegistry.registerFont(this, url);
}
return rule;
}
getPathGenerator(objs, character) {
if (this.compiledGlyphs[character] !== undefined) {
return this.compiledGlyphs[character];
}
let cmds, current;
try {
cmds = objs.get(this.loadedName + '_path_' + character);
} catch (ex) {
if (!this.ignoreErrors) {
throw ex;
}
if (!this.data || this.disableFontFace) {
return null;
if (this._onUnsupportedFeature) {
this._onUnsupportedFeature({ featureId: UNSUPPORTED_FEATURES.font, });
}
warn(`getPathGenerator - ignoring character: "${ex}".`);
var nativeFontFace = new FontFace(this.loadedName, this.data, {});
if (this.fontRegistry) {
this.fontRegistry.registerFont(this);
}
return nativeFontFace;
},
createFontFaceRule: function FontFaceObject_createFontFaceRule() {
if (!this.data || this.disableFontFace) {
return null;
}
var data = bytesToString(new Uint8Array(this.data));
var fontName = this.loadedName;
// Add the font-face rule to the document
var url = ('url(data:' + this.mimetype + ';base64,' + btoa(data) + ');');
var rule = '@font-face { font-family:"' + fontName + '";src:' + url + '}';
if (this.fontRegistry) {
this.fontRegistry.registerFont(this, url);
}
return rule;
},
getPathGenerator(objs, character) {
if (this.compiledGlyphs[character] !== undefined) {
return this.compiledGlyphs[character];
}
let cmds, current;
try {
cmds = objs.get(this.loadedName + '_path_' + character);
} catch (ex) {
if (!this.ignoreErrors) {
throw ex;
}
if (this._onUnsupportedFeature) {
this._onUnsupportedFeature({ featureId: UNSUPPORTED_FEATURES.font, });
}
warn(`getPathGenerator - ignoring character: "${ex}".`);
return this.compiledGlyphs[character] = function(c, size) {
// No-op function, to allow rendering to continue.
};
}
// If we can, compile cmds into JS for MAXIMUM SPEED...
if (this.isEvalSupported && IsEvalSupportedCached.value) {
let args, js = '';
for (let i = 0, ii = cmds.length; i < ii; i++) {
current = cmds[i];
if (current.args !== undefined) {
args = current.args.join(',');
} else {
args = '';
}
js += 'c.' + current.cmd + '(' + args + ');\n';
}
// eslint-disable-next-line no-new-func
return this.compiledGlyphs[character] = new Function('c', 'size', js);
}
// ... but fall back on using Function.prototype.apply() if we're
// blocked from using eval() for whatever reason (like CSP policies).
return this.compiledGlyphs[character] = function(c, size) {
for (let i = 0, ii = cmds.length; i < ii; i++) {
current = cmds[i];
if (current.cmd === 'scale') {
current.args = [size, -size];
}
c[current.cmd].apply(c, current.args);
}
// No-op function, to allow rendering to continue.
};
},
};
}
return FontFaceObject;
})();
// If we can, compile cmds into JS for MAXIMUM SPEED...
if (this.isEvalSupported && IsEvalSupportedCached.value) {
let args, js = '';
for (let i = 0, ii = cmds.length; i < ii; i++) {
current = cmds[i];
if (current.args !== undefined) {
args = current.args.join(',');
} else {
args = '';
}
js += 'c.' + current.cmd + '(' + args + ');\n';
}
// eslint-disable-next-line no-new-func
return this.compiledGlyphs[character] = new Function('c', 'size', js);
}
// ... but fall back on using Function.prototype.apply() if we're
// blocked from using eval() for whatever reason (like CSP policies).
return this.compiledGlyphs[character] = function(c, size) {
for (let i = 0, ii = cmds.length; i < ii; i++) {
current = cmds[i];
if (current.cmd === 'scale') {
current.args = [size, -size];
}
c[current.cmd].apply(c, current.args);
}
};
}
}
export {
FontFaceObject,