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Add Encodings.js and change the code to generate a CharSet per font, this will allow future changes to the OpenType font generator

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This commit is contained in:
Vivien Nicolas 2011-06-15 05:40:54 +02:00
parent 1dcd42b66c
commit f7e90f569c
4 changed files with 1584 additions and 34 deletions
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46
PDFFont.js
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@ -40,7 +40,7 @@ var Fonts = {
unicodeFromCode: function fonts_unicodeFromCode(aCode) {
var active = this._active;
if (!active)
if (!active || !active.encoding)
return aCode;
var difference = active.encoding[aCode];
@ -60,7 +60,7 @@ var Fonts = {
* As an improvment the last parameter can be replaced by an automatic guess
* of the font type based on the first byte of the file.
*/
var Font = function(aName, aFile, aEncoding, aType) {
var Font = function(aName, aFile, aEncoding, aCharset, aType) {
this.name = aName;
// If the font has already been decoded simply return
@ -95,6 +95,7 @@ var Font = function(aName, aFile, aEncoding, aType) {
Fonts[aName] = {
data: this.font,
encoding: aEncoding,
charset: aCharset ? aCharset.slice() : null,
loading: true
}
@ -125,10 +126,10 @@ Font.prototype = {
// Actually there is not event when a font has finished downloading so
// the following tons of code are a dirty hack to 'guess' when a font is
// ready
var debug = false;
var debug = true;
var canvas = document.createElement("canvas");
var style = "position:absolute; top: " +
var style = "border: 1px solid black; position:absolute; top: " +
(debug ? (80 * fontCount) : "-200") + "px; left: 100px;";
canvas.setAttribute("style", style);
canvas.setAttribute("width", 100);
@ -136,40 +137,19 @@ Font.prototype = {
document.body.appendChild(canvas);
// Retrieve font charset
var charset = null;
var page = pdfDocument.getPage(pageNum);
var xref = page.xref;
var fonts = page.fonts;
fonts.forEach(function(fontKey, fontData) {
var descriptor = xref.fetch(fontData.get("FontDescriptor"));
var name = descriptor.get("FontName").toString();
var font = Fonts[name.replace("+", "_")];
if (font && font.loading && name == fontName.replace("_", "+")) {
charset = descriptor.get("CharSet");
charset = charset ? charset.split("/") : null;
return;
}
});
// Warn if the charset is not found, this is likely
var testCharset = charset || [];
if (!charset) {
warn("No charset found for: " + fontName);
} else {
// if the charset is too small make it repeat a few times
var count = 30;
while (count-- && testCharset.length <= 30)
testCharset = testCharset.concat(charset.slice());
}
var charset = Fonts[fontName].charset || [];
// if the charset is too small make it repeat a few times
var count = 30;
while (count-- && charset.length <= 30)
charset = charset.concat(charset.slice());
// Get the font size canvas think it will be
var ctx = canvas.getContext("2d");
var testString = "";
for (var i = 0; i < testCharset.length; i++) {
var unicode = new Number("0x" + GlyphsUnicode[testCharset[i]]);
for (var i = 0; i < charset.length; i++) {
var unicode = new Number("0x" + GlyphsUnicode[charset[i]]);
if (!unicode)
error("Unicode for " + testCharset[i] + " is has not been found in the glyphs list");
error("Unicode for " + charset[i] + " is has not been found in the glyphs list");
testString += String.fromCharCode(unicode);
}
ctx.font = "20px " + fontName + ", Symbol";