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Clean up a bit the encoding/charset/glyphs dance

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This commit is contained in:
Vivien Nicolas 2011-08-30 00:56:02 +02:00
parent 57b3d28f8f
commit 95ccb38283
2 changed files with 71 additions and 122 deletions
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89
pdf.js
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@ -4199,8 +4199,6 @@ var PartialEvaluator = (function() {
var builtInEncoding = false;
var encodingMap = {};
var glyphMap = {};
var charset = [];
if (compositeFont) {
// Special CIDFont support
// XXX only CIDFontType2 supported for now
@ -4242,69 +4240,61 @@ var PartialEvaluator = (function() {
if (fontDict.has('Encoding')) {
var encoding = xref.fetchIfRef(fontDict.get('Encoding'));
if (IsDict(encoding)) {
// Build a map of between codes and glyphs
// Load the base encoding
var baseName = encoding.get('BaseEncoding');
if (baseName) {
if (baseName)
baseEncoding = Encodings[baseName.name].slice();
}
// Load the differences between the base and original
var differences = encoding.get('Differences');
var index = 0;
for (var j = 0; j < differences.length; j++) {
var data = differences[j];
if (IsNum(data)) {
if (IsNum(data))
index = data;
} else {
else
diffEncoding[index++] = data.name;
}
}
} else if (IsName(encoding)) {
baseEncoding = Encodings[encoding.name].slice();
} else {
error("Encoding is not a Name nor a Dict");
}
}
var fontType = subType.name;
if (!baseEncoding) {
var type = subType.name;
if (type == 'TrueType') {
baseEncoding = Encodings.WinAnsiEncoding.slice();
} else if (type == 'Type1') {
baseEncoding = Encodings.StandardEncoding.slice();
if (!diffEncoding.length)
builtInEncoding = true;
} else {
error('Unknown type of font');
switch (fontType) {
case 'TrueType':
baseEncoding = Encodings.WinAnsiEncoding.slice();
break;
case 'Type1':
baseEncoding = Encodings.StandardEncoding.slice();
break;
default:
warn('Unknown type of font: ' + fontType);
break;
}
}
// firstChar and width are required
// (except for 14 standard fonts)
var firstChar = xref.fetchIfRef(fontDict.get('FirstChar')) || 0;
var lastChar = xref.fetchIfRef(fontDict.get('LastChar')) || 0;
var widths = xref.fetchIfRef(fontDict.get('Widths')) || [];
// merge in the differences
var length = baseEncoding.length > diffEncoding.length ?
baseEncoding.length : diffEncoding.length;
for (var i = 0, ii = length; i < ii; ++i) {
var diffGlyph = diffEncoding[i];
var baseGlyph = baseEncoding[i];
if (diffGlyph) {
glyphMap[i] = diffGlyph;
encodingMap[i] = GlyphsUnicode[diffGlyph];
} else if (baseGlyph) {
glyphMap[i] = baseGlyph;
encodingMap[i] = GlyphsUnicode[baseGlyph];
}
var glyphsMap = {};
for (var i = firstChar; i <= lastChar; i++) {
var glyph = diffEncoding[i] || baseEncoding[i];
if (glyph)
glyphsMap[glyph] = encodingMap[i] = GlyphsUnicode[glyph];
}
if (fontDict.has('ToUnicode')) {
encodingMap['empty'] = true;
var glyphsMap = {};
for (var p in glyphMap)
glyphsMap[glyphMap[p]] = encodingMap[p];
if (fontDict.has('ToUnicode') && differences) {
var cmapObj = xref.fetchIfRef(fontDict.get('ToUnicode'));
if (IsName(cmapObj)) {
error('ToUnicode file cmap translation not implemented');
} else if (IsStream(cmapObj)) {
var firstChar = xref.fetchIfRef(fontDict.get('FirstChar'));
var tokens = [];
var token = '';
@ -4334,6 +4324,8 @@ var PartialEvaluator = (function() {
var startRange = parseInt('0x' + tokens[j]);
var endRange = parseInt('0x' + tokens[j + 1]);
var code = parseInt('0x' + tokens[j + 2]);
for (var k = startRange; k < endRange; k++)
encodingMap[k] = code++;
}
break;
@ -4360,15 +4352,6 @@ var PartialEvaluator = (function() {
}
}
}
// firstChar and width are required
// (except for 14 standard fonts)
var firstChar = xref.fetchIfRef(fontDict.get('FirstChar'));
var widths = xref.fetchIfRef(fontDict.get('Widths')) || [];
for (var j = 0; j < widths.length; j++) {
if (widths[j])
charset.push(glyphMap[j + firstChar]);
}
}
if (!fd) {
@ -4396,7 +4379,6 @@ var PartialEvaluator = (function() {
}
var descriptor = xref.fetch(fd);
var fontName = fontDict.get('Name');
if (!fontName)
fontName = xref.fetchIfRef(descriptor.get('FontName'));;
@ -4414,14 +4396,6 @@ var PartialEvaluator = (function() {
}
}
if (descriptor.has('CharSet')) {
// Get the font charset if any (meaningful only in Type 1)
charset = descriptor.get('CharSet');
assertWellFormed(IsString(charset), 'invalid charset');
charset = charset.split('/');
charset.shift();
}
var widths = fontDict.get('Widths');
if (widths) {
var glyphWidths = {};
@ -4435,9 +4409,8 @@ var PartialEvaluator = (function() {
subtype: fileType,
widths: glyphWidths,
encoding: encodingMap,
differences: diffEncoding,
glyphs: glyphsMap || GlyphsUnicode,
builtInEncoding: builtInEncoding,
charset: charset,
firstChar: fontDict.get('FirstChar'),
lastChar: fontDict.get('LastChar'),
bbox: descriptor.get('FontBBox'),