Make Type1Font more class-like, by adding closure
*Note:* Ignoring whitespace should simplify reviewing a great deal.
This commit is contained in:
Jonas Jenwald
parent
447c48ea27
commit
c40df8a393
@ -3637,231 +3637,236 @@ var CFFStandardStrings = [
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];
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// Type1Font is also a CIDFontType0.
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var Type1Font = function Type1Font(name, file, properties) {
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// Some bad generators embed pfb file as is, we have to strip 6-byte headers.
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// Also, length1 and length2 might be off by 6 bytes as well.
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// http://www.math.ubc.ca/~cass/piscript/type1.pdf
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var PFB_HEADER_SIZE = 6;
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var headerBlockLength = properties.length1;
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var eexecBlockLength = properties.length2;
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var pfbHeader = file.peekBytes(PFB_HEADER_SIZE);
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var pfbHeaderPresent = pfbHeader[0] === 0x80 && pfbHeader[1] === 0x01;
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if (pfbHeaderPresent) {
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file.skip(PFB_HEADER_SIZE);
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headerBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
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(pfbHeader[3] << 8) | pfbHeader[2];
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}
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// Get the data block containing glyphs and subrs informations
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var headerBlock = new Stream(file.getBytes(headerBlockLength));
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var headerBlockParser = new Type1Parser(headerBlock);
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headerBlockParser.extractFontHeader(properties);
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if (pfbHeaderPresent) {
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pfbHeader = file.getBytes(PFB_HEADER_SIZE);
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eexecBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
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(pfbHeader[3] << 8) | pfbHeader[2];
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}
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// Decrypt the data blocks and retrieve it's content
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var eexecBlock = new Stream(file.getBytes(eexecBlockLength));
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var eexecBlockParser = new Type1Parser(eexecBlock, true);
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var data = eexecBlockParser.extractFontProgram();
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for (var info in data.properties) {
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properties[info] = data.properties[info];
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}
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var charstrings = data.charstrings;
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var type2Charstrings = this.getType2Charstrings(charstrings);
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var subrs = this.getType2Subrs(data.subrs);
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this.charstrings = charstrings;
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this.data = this.wrap(name, type2Charstrings, this.charstrings,
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subrs, properties);
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this.seacs = this.getSeacs(data.charstrings);
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};
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Type1Font.prototype = {
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get numGlyphs() {
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return this.charstrings.length + 1;
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},
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getCharset: function Type1Font_getCharset() {
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var charset = ['.notdef'];
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var charstrings = this.charstrings;
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for (var glyphId = 0; glyphId < charstrings.length; glyphId++) {
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charset.push(charstrings[glyphId].glyphName);
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var Type1Font = (function Type1FontClosure() {
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function Type1Font(name, file, properties) {
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// Some bad generators embed pfb file as is, we have to strip 6-byte header.
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// Also, length1 and length2 might be off by 6 bytes as well.
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// http://www.math.ubc.ca/~cass/piscript/type1.pdf
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var PFB_HEADER_SIZE = 6;
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var headerBlockLength = properties.length1;
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var eexecBlockLength = properties.length2;
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var pfbHeader = file.peekBytes(PFB_HEADER_SIZE);
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var pfbHeaderPresent = pfbHeader[0] === 0x80 && pfbHeader[1] === 0x01;
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if (pfbHeaderPresent) {
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file.skip(PFB_HEADER_SIZE);
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headerBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
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(pfbHeader[3] << 8) | pfbHeader[2];
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}
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return charset;
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},
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getGlyphMapping: function Type1Font_getGlyphMapping(properties) {
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var charstrings = this.charstrings;
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var glyphNames = ['.notdef'], glyphId;
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for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
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glyphNames.push(charstrings[glyphId].glyphName);
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// Get the data block containing glyphs and subrs informations
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var headerBlock = new Stream(file.getBytes(headerBlockLength));
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var headerBlockParser = new Type1Parser(headerBlock);
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headerBlockParser.extractFontHeader(properties);
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if (pfbHeaderPresent) {
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pfbHeader = file.getBytes(PFB_HEADER_SIZE);
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eexecBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
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(pfbHeader[3] << 8) | pfbHeader[2];
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}
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var encoding = properties.builtInEncoding;
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if (encoding) {
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var builtInEncoding = Object.create(null);
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for (var charCode in encoding) {
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glyphId = glyphNames.indexOf(encoding[charCode]);
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if (glyphId >= 0) {
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builtInEncoding[charCode] = glyphId;
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// Decrypt the data blocks and retrieve it's content
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var eexecBlock = new Stream(file.getBytes(eexecBlockLength));
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var eexecBlockParser = new Type1Parser(eexecBlock, true);
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var data = eexecBlockParser.extractFontProgram();
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for (var info in data.properties) {
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properties[info] = data.properties[info];
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}
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var charstrings = data.charstrings;
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var type2Charstrings = this.getType2Charstrings(charstrings);
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var subrs = this.getType2Subrs(data.subrs);
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this.charstrings = charstrings;
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this.data = this.wrap(name, type2Charstrings, this.charstrings,
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subrs, properties);
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this.seacs = this.getSeacs(data.charstrings);
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}
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Type1Font.prototype = {
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get numGlyphs() {
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return this.charstrings.length + 1;
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},
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getCharset: function Type1Font_getCharset() {
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var charset = ['.notdef'];
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var charstrings = this.charstrings;
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for (var glyphId = 0; glyphId < charstrings.length; glyphId++) {
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charset.push(charstrings[glyphId].glyphName);
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}
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return charset;
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},
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getGlyphMapping: function Type1Font_getGlyphMapping(properties) {
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var charstrings = this.charstrings;
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var glyphNames = ['.notdef'], glyphId;
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for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
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glyphNames.push(charstrings[glyphId].glyphName);
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}
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var encoding = properties.builtInEncoding;
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if (encoding) {
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var builtInEncoding = Object.create(null);
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for (var charCode in encoding) {
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glyphId = glyphNames.indexOf(encoding[charCode]);
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if (glyphId >= 0) {
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builtInEncoding[charCode] = glyphId;
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}
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}
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}
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}
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return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
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},
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return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
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},
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getSeacs: function Type1Font_getSeacs(charstrings) {
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var i, ii;
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var seacMap = [];
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for (i = 0, ii = charstrings.length; i < ii; i++) {
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var charstring = charstrings[i];
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if (charstring.seac) {
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// Offset by 1 for .notdef
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seacMap[i + 1] = charstring.seac;
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}
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}
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return seacMap;
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},
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getType2Charstrings: function Type1Font_getType2Charstrings(
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type1Charstrings) {
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var type2Charstrings = [];
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for (var i = 0, ii = type1Charstrings.length; i < ii; i++) {
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type2Charstrings.push(type1Charstrings[i].charstring);
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}
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return type2Charstrings;
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},
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getType2Subrs: function Type1Font_getType2Subrs(type1Subrs) {
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var bias = 0;
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var count = type1Subrs.length;
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if (count < 1133) {
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bias = 107;
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} else if (count < 33769) {
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bias = 1131;
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} else {
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bias = 32768;
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}
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// Add a bunch of empty subrs to deal with the Type2 bias
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var type2Subrs = [];
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var i;
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for (i = 0; i < bias; i++) {
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type2Subrs.push([0x0B]);
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}
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for (i = 0; i < count; i++) {
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type2Subrs.push(type1Subrs[i]);
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}
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return type2Subrs;
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},
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wrap: function Type1Font_wrap(name, glyphs, charstrings, subrs, properties) {
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var cff = new CFF();
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cff.header = new CFFHeader(1, 0, 4, 4);
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cff.names = [name];
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var topDict = new CFFTopDict();
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// CFF strings IDs 0...390 are predefined names, so refering
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// to entries in our own String INDEX starts at SID 391.
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topDict.setByName('version', 391);
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topDict.setByName('Notice', 392);
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topDict.setByName('FullName', 393);
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topDict.setByName('FamilyName', 394);
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topDict.setByName('Weight', 395);
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topDict.setByName('Encoding', null); // placeholder
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topDict.setByName('FontMatrix', properties.fontMatrix);
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topDict.setByName('FontBBox', properties.bbox);
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topDict.setByName('charset', null); // placeholder
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topDict.setByName('CharStrings', null); // placeholder
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topDict.setByName('Private', null); // placeholder
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cff.topDict = topDict;
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var strings = new CFFStrings();
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strings.add('Version 0.11'); // Version
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strings.add('See original notice'); // Notice
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strings.add(name); // FullName
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strings.add(name); // FamilyName
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strings.add('Medium'); // Weight
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cff.strings = strings;
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cff.globalSubrIndex = new CFFIndex();
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var count = glyphs.length;
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var charsetArray = [0];
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var i, ii;
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for (i = 0; i < count; i++) {
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var index = CFFStandardStrings.indexOf(charstrings[i].glyphName);
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// TODO: Insert the string and correctly map it. Previously it was
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// thought mapping names that aren't in the standard strings to .notdef
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// was fine, however in issue818 when mapping them all to .notdef the
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// adieresis glyph no longer worked.
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if (index === -1) {
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index = 0;
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}
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charsetArray.push((index >> 8) & 0xff, index & 0xff);
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}
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cff.charset = new CFFCharset(false, 0, [], charsetArray);
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var charStringsIndex = new CFFIndex();
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charStringsIndex.add([0x8B, 0x0E]); // .notdef
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for (i = 0; i < count; i++) {
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charStringsIndex.add(glyphs[i]);
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}
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cff.charStrings = charStringsIndex;
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var privateDict = new CFFPrivateDict();
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privateDict.setByName('Subrs', null); // placeholder
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var fields = [
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'BlueValues',
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'OtherBlues',
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'FamilyBlues',
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'FamilyOtherBlues',
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'StemSnapH',
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'StemSnapV',
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'BlueShift',
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'BlueFuzz',
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'BlueScale',
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'LanguageGroup',
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'ExpansionFactor',
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'ForceBold',
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'StdHW',
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'StdVW'
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];
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for (i = 0, ii = fields.length; i < ii; i++) {
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var field = fields[i];
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if (!(field in properties.privateData)) {
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continue;
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}
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var value = properties.privateData[field];
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if (isArray(value)) {
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// All of the private dictionary array data in CFF must be stored as
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// "delta-encoded" numbers.
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for (var j = value.length - 1; j > 0; j--) {
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value[j] -= value[j - 1]; // ... difference from previous value
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getSeacs: function Type1Font_getSeacs(charstrings) {
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var i, ii;
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var seacMap = [];
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for (i = 0, ii = charstrings.length; i < ii; i++) {
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var charstring = charstrings[i];
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if (charstring.seac) {
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// Offset by 1 for .notdef
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seacMap[i + 1] = charstring.seac;
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}
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}
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privateDict.setByName(field, value);
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}
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cff.topDict.privateDict = privateDict;
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return seacMap;
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},
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var subrIndex = new CFFIndex();
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for (i = 0, ii = subrs.length; i < ii; i++) {
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subrIndex.add(subrs[i]);
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}
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privateDict.subrsIndex = subrIndex;
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getType2Charstrings: function Type1Font_getType2Charstrings(
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type1Charstrings) {
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var type2Charstrings = [];
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for (var i = 0, ii = type1Charstrings.length; i < ii; i++) {
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type2Charstrings.push(type1Charstrings[i].charstring);
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}
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return type2Charstrings;
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},
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var compiler = new CFFCompiler(cff);
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return compiler.compile();
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}
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};
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getType2Subrs: function Type1Font_getType2Subrs(type1Subrs) {
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var bias = 0;
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var count = type1Subrs.length;
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if (count < 1133) {
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bias = 107;
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} else if (count < 33769) {
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bias = 1131;
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} else {
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bias = 32768;
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}
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// Add a bunch of empty subrs to deal with the Type2 bias
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var type2Subrs = [];
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var i;
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for (i = 0; i < bias; i++) {
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type2Subrs.push([0x0B]);
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}
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for (i = 0; i < count; i++) {
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type2Subrs.push(type1Subrs[i]);
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}
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return type2Subrs;
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},
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wrap: function Type1Font_wrap(name, glyphs, charstrings, subrs,
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properties) {
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var cff = new CFF();
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cff.header = new CFFHeader(1, 0, 4, 4);
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cff.names = [name];
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var topDict = new CFFTopDict();
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// CFF strings IDs 0...390 are predefined names, so refering
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// to entries in our own String INDEX starts at SID 391.
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topDict.setByName('version', 391);
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topDict.setByName('Notice', 392);
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topDict.setByName('FullName', 393);
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topDict.setByName('FamilyName', 394);
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topDict.setByName('Weight', 395);
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topDict.setByName('Encoding', null); // placeholder
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topDict.setByName('FontMatrix', properties.fontMatrix);
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topDict.setByName('FontBBox', properties.bbox);
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topDict.setByName('charset', null); // placeholder
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topDict.setByName('CharStrings', null); // placeholder
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topDict.setByName('Private', null); // placeholder
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cff.topDict = topDict;
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var strings = new CFFStrings();
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strings.add('Version 0.11'); // Version
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strings.add('See original notice'); // Notice
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strings.add(name); // FullName
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strings.add(name); // FamilyName
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strings.add('Medium'); // Weight
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cff.strings = strings;
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cff.globalSubrIndex = new CFFIndex();
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var count = glyphs.length;
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var charsetArray = [0];
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var i, ii;
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for (i = 0; i < count; i++) {
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var index = CFFStandardStrings.indexOf(charstrings[i].glyphName);
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// TODO: Insert the string and correctly map it. Previously it was
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// thought mapping names that aren't in the standard strings to .notdef
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// was fine, however in issue818 when mapping them all to .notdef the
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// adieresis glyph no longer worked.
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if (index === -1) {
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index = 0;
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}
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charsetArray.push((index >> 8) & 0xff, index & 0xff);
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}
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cff.charset = new CFFCharset(false, 0, [], charsetArray);
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var charStringsIndex = new CFFIndex();
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charStringsIndex.add([0x8B, 0x0E]); // .notdef
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for (i = 0; i < count; i++) {
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charStringsIndex.add(glyphs[i]);
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}
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cff.charStrings = charStringsIndex;
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var privateDict = new CFFPrivateDict();
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privateDict.setByName('Subrs', null); // placeholder
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var fields = [
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'BlueValues',
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'OtherBlues',
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'FamilyBlues',
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'FamilyOtherBlues',
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'StemSnapH',
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'StemSnapV',
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'BlueShift',
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'BlueFuzz',
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'BlueScale',
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'LanguageGroup',
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'ExpansionFactor',
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'ForceBold',
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'StdHW',
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'StdVW'
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];
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for (i = 0, ii = fields.length; i < ii; i++) {
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var field = fields[i];
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if (!(field in properties.privateData)) {
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continue;
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}
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var value = properties.privateData[field];
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if (isArray(value)) {
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// All of the private dictionary array data in CFF must be stored as
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// "delta-encoded" numbers.
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for (var j = value.length - 1; j > 0; j--) {
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value[j] -= value[j - 1]; // ... difference from previous value
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}
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}
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privateDict.setByName(field, value);
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}
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cff.topDict.privateDict = privateDict;
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var subrIndex = new CFFIndex();
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for (i = 0, ii = subrs.length; i < ii; i++) {
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subrIndex.add(subrs[i]);
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}
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privateDict.subrsIndex = subrIndex;
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var compiler = new CFFCompiler(cff);
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return compiler.compile();
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}
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};
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return Type1Font;
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})();
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var CFFFont = (function CFFFontClosure() {
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function CFFFont(file, properties) {
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