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Open the CFF class road for Type1C font

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This commit is contained in:
Vivien Nicolas 2011-07-01 00:44:11 +02:00
parent 2e7df01459
commit 5cbc6875b3
1 changed files with 59 additions and 75 deletions
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134
fonts.js
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@ -6,7 +6,7 @@
/**
* Maximum file size of the font.
*/
var kMaxFontFileSize = 40000;
var kMaxFontFileSize = 200000;
/**
* Maximum time to wait for a font to be loaded by @font-face
@ -34,7 +34,7 @@ var kDisableFonts = false;
* http://cgit.freedesktop.org/poppler/poppler/tree/poppler/GfxFont.cc#n65
*/
var Fonts = (function () {
var Fonts = (function Fonts() {
var kScalePrecision = 40;
var fonts = Object.create(null);
var ctx = document.createElement("canvas").getContext("2d");
@ -1462,13 +1462,17 @@ var CFF = function(name, file, properties) {
var length1 = file.dict.get("Length1");
var length2 = file.dict.get("Length2");
file.skip(length1);
var eexecBlock = file.getBytes(length2);
// Decrypt the data blocks and retrieve it's content
var eexecBlock = file.getBytes(length2);
var data = type1Parser.extractFontProgram(eexecBlock);
this.charstrings = this.getOrderedCharStrings(data.charstrings);
this.data = this.wrap(name, this.charstrings, data.subrs, properties);
var charstrings = this.getOrderedCharStrings(data.charstrings);
var type2Charstrings = this.getType2Charstrings(charstrings);
var subrs = this.getType2Subrs(data.subrs);
this.charstrings = charstrings;
this.data = this.wrap(name, type2Charstrings, this.charstrings, subrs, properties);
};
CFF.prototype = {
@ -1546,12 +1550,40 @@ CFF.prototype = {
return charstrings;
},
getType2Charstrings: function cff_getType2Charstrings(type1Charstrings) {
var type2Charstrings = [];
var count = type1Charstrings.length;
for (var i = 0; i < count; i++) {
var charstring = type1Charstrings[i].charstring;
type2Charstrings.push(this.flattenCharstring(charstring.slice(), this.commandsMap));
}
return type2Charstrings;
},
getType2Subrs: function cff_getType2Charstrings(type1Subrs) {
var bias = 0;
var count = type1Subrs.length;
if (count < 1240)
bias = 107;
else if (count < 33900)
bias = 1131;
else
bias = 32768;
// Add a bunch of empty subrs to deal with the Type2 bias
var type2Subrs = [];
for (var i = 0; i < bias; i++)
type2Subrs.push([0x0B]);
for (var i = 0; i < count; i++)
type2Subrs.push(this.flattenCharstring(type1Subrs[i], this.commandsMap));
return type2Subrs;
},
/*
* Flatten the commands by interpreting the postscript code and replacing
* every 'callsubr', 'callothersubr' by the real commands.
*
* TODO This function also do a string to command number transformation
* that can probably be avoided if the Type1 decodeCharstring code is smarter
*/
commandsMap: {
"hstem": 1,
@ -1573,58 +1605,27 @@ CFF.prototype = {
"hvcurveto": 31,
},
flattenCharstring: function flattenCharstring(charstring) {
var i = 0;
while (true) {
var obj = charstring[i];
if (obj == undefined) {
error("unknow charstring command for " + i + " in " + charstring);
}
if (obj.charAt) {
switch (obj) {
case "endchar":
case "return":
// CharString is ready to be re-encode to commands number at this point
for (var j = 0; j < charstring.length; j++) {
var command = charstring[j];
if (parseFloat(command) == command) {
charstring.splice(j, 1, 28, command >> 8, command);
j+= 2;
} else if (command.charAt) {
var cmd = this.commandsMap[command];
if (!cmd)
error("Unknow command: " + command);
flattenCharstring: function flattenCharstring(charstring, map) {
for (var i = 0; i < charstring.length; i++) {
var command = charstring[i];
if (command.charAt) {
var cmd = map[command];
assert(cmd, "Unknow command: " + command);
if (IsArray(cmd)) {
charstring.splice(j, 1, cmd[0], cmd[1]);
j += 1;
} else {
charstring[j] = cmd;
}
}
}
return charstring;
default:
break;
if (IsArray(cmd)) {
charstring.splice(i++, 1, cmd[0], cmd[1]);
} else {
charstring[i] = cmd;
}
} else {
charstring.splice(i, 1, 28, command >> 8, command & 0xff);
i+= 2;
}
i++;
}
error("failing with i = " + i + " in charstring:" + charstring + "(" + charstring.length + ")");
return [];
return charstring;
},
wrap: function wrap(name, charstrings, subrs, properties) {
// Starts the conversion of the Type1 charstrings to Type2
var glyphs = [];
var glyphsCount = charstrings.length;
for (var i = 0; i < glyphsCount; i++) {
var charstring = charstrings[i].charstring;
glyphs.push(this.flattenCharstring(charstring.slice()));
}
// Create a CFF font data
wrap: function wrap(name, glyphs, charstrings, subrs, properties) {
var cff = new Uint8Array(kMaxFontFileSize);
var currentOffset = 0;
@ -1656,10 +1657,12 @@ CFF.prototype = {
// Fill the charset header (first byte is the encoding)
var charset = [0x00];
var glyphsCount = glyphs.length;
for (var i = 0; i < glyphsCount; i++) {
var index = CFFStrings.indexOf(charstrings[i].glyph);
if (index == -1)
index = CFFStrings.length + strings.indexOf(charstrings[i].glyph);
var bytes = FontsUtils.integerToBytes(index, 2);
charset.push(bytes[0]);
charset.push(bytes[1]);
@ -1731,28 +1734,9 @@ CFF.prototype = {
cff.set(privateData, currentOffset);
currentOffset += privateData.length;
// Local Subrs
var flattenedSubrs = [];
var bias = 0;
var subrsCount = subrs.length;
if (subrsCount < 1240)
bias = 107;
else if (subrsCount < 33900)
bias = 1131;
else
bias = 32768;
// Add a bunch of empty subrs to deal with the Type2 bias
for (var i = 0; i < bias; i++)
flattenedSubrs.push([0x0B]);
for (var i = 0; i < subrsCount; i++) {
var subr = subrs[i];
flattenedSubrs.push(this.flattenCharstring(subr));
}
var subrsData = this.createCFFIndexHeader(flattenedSubrs, true);
// Local subrs
var subrsData = this.createCFFIndexHeader(subrs, true);
cff.set(subrsData, currentOffset);
currentOffset += subrsData.length;