Clean up Fonts.convert()
This commit is contained in:
Vivien Nicolas
parent
b390a03a1d
commit
f58983f4e5
144
fonts.js
144
fonts.js
@ -944,8 +944,6 @@ var Font = (function () {
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},
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convert: function font_convert(fontName, font, properties) {
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var otf = new Uint8Array(kMaxFontFileSize);
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function createNameTable(name) {
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// All the strings of the name table should be an odd number of bytes
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if (name.length % 2)
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@ -1008,7 +1006,7 @@ var Font = (function () {
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nameTable += strings.join("") + stringsUnicode.join("");
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return nameTable;
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}
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function isFixedPitch(glyphs) {
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for (var i = 0; i < glyphs.length - 1; i++) {
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if (glyphs[i] != glyphs[i+1])
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@ -1017,46 +1015,34 @@ var Font = (function () {
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return true;
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};
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// Required Tables
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var CFF =
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font.data, // PostScript Font Program
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OS2, // OS/2 and Windows Specific metrics
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cmap, // Character to glyphs mapping
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head, // Font header
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hhea, // Horizontal header
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hmtx, // Horizontal metrics
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maxp, // Maximum profile
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name, // Naming tables
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post; // PostScript informations
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var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
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// The offsets object holds at the same time a representation of where
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// to write the table entry information about a table and another offset
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// representing the offset where to draw the actual data of a particular
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// table
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var kRequiredTablesCount = 9;
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var offsets = {
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currentOffset: 0,
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virtualOffset: tables.length * (4 * 4)
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virtualOffset: 9 * (4 * 4)
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};
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// It there is only one font, offset table is the first bytes of the file
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createOpenTypeHeader("\x4F\x54\x54\x4F", otf, offsets, tables.length);
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var otf = new Uint8Array(kMaxFontFileSize);
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createOpenTypeHeader("\x4F\x54\x54\x4F", otf, offsets, 9);
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/** CFF */
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createTableEntry(otf, offsets, "CFF ", CFF);
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/** OS/2 */
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var charstrings = font.charstrings;
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properties.fixedPitch = isFixedPitch(charstrings);
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OS2 = stringToArray(createOS2Table(properties));
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createTableEntry(otf, offsets, "OS/2", OS2);
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var fields = {
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// PostScript Font Program
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"CFF ": font.data,
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/** CMAP */
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cmap = createCMapTable(charstrings.slice());
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createTableEntry(otf, offsets, "cmap", cmap);
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// OS/2 and Windows Specific metrics
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"OS/2": stringToArray(createOS2Table(properties)),
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/** HEAD */
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head = stringToArray(
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// Character to glyphs mapping
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"cmap": createCMapTable(charstrings.slice()),
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// Font header
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"head": (function() {
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return stringToArray(
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"\x00\x01\x00\x00" + // Version number
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"\x00\x00\x10\x00" + // fontRevision
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"\x00\x00\x00\x00" + // checksumAdjustement
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@ -1073,63 +1059,59 @@ var Font = (function () {
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"\x00\x11" + // lowestRecPPEM
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"\x00\x00" + // fontDirectionHint
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"\x00\x00" + // indexToLocFormat
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"\x00\x00" // glyphDataFormat
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);
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createTableEntry(otf, offsets, "head", head);
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"\x00\x00"); // glyphDataFormat
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})(),
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/** HHEA */
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hhea = stringToArray(
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"\x00\x01\x00\x00" + // Version number
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string16(properties.ascent) + // Typographic Ascent
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string16(properties.descent) + // Typographic Descent
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"\x00\x00" + // Line Gap
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"\xFF\xFF" + // advanceWidthMax
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"\x00\x00" + // minLeftSidebearing
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"\x00\x00" + // minRightSidebearing
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"\x00\x00" + // xMaxExtent
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string16(properties.capHeight) + // caretSlopeRise
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string16(Math.tan(properties.italicAngle) * properties.xHeight) + // caretSlopeRun
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"\x00\x00" + // caretOffset
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // metricDataFormat
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string16(charstrings.length + 1) // Number of HMetrics
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);
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createTableEntry(otf, offsets, "hhea", hhea);
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// Horizontal header
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"hhea": (function() {
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return stringToArray(
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"\x00\x01\x00\x00" + // Version number
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string16(properties.ascent) + // Typographic Ascent
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string16(properties.descent) + // Typographic Descent
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"\x00\x00" + // Line Gap
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"\xFF\xFF" + // advanceWidthMax
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"\x00\x00" + // minLeftSidebearing
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"\x00\x00" + // minRightSidebearing
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"\x00\x00" + // xMaxExtent
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string16(properties.capHeight) + // caretSlopeRise
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string16(Math.tan(properties.italicAngle) * properties.xHeight) + // caretSlopeRun
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"\x00\x00" + // caretOffset
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // -reserved-
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"\x00\x00" + // metricDataFormat
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string16(charstrings.length + 1)); // Number of HMetrics
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})(),
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/** HMTX */
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/* For some reasons, probably related to how the backend handle fonts,
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* Linux seems to ignore this file and prefer the data from the CFF itself
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* while Windows use this data. So be careful if you hack on Linux and
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* have to touch the 'hmtx' table
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*/
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hmtx = "\x00\x00\x00\x00"; // Fake .notdef
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for (var i = 0; i < charstrings.length; i++) {
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hmtx += string16(charstrings[i].width) + string16(0);
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}
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hmtx = stringToArray(hmtx);
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createTableEntry(otf, offsets, "hmtx", hmtx);
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// Horizontal metrics
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"hmtx": (function() {
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var hmtx = "\x00\x00\x00\x00"; // Fake .notdef
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for (var i = 0; i < charstrings.length; i++) {
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hmtx += string16(charstrings[i].width) + string16(0);
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}
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return stringToArray(hmtx);
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})(),
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/** MAXP */
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maxp = "\x00\x00\x50\x00" + // Version number
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string16(charstrings.length + 1); // Num of glyphs
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maxp = stringToArray(maxp);
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createTableEntry(otf, offsets, "maxp", maxp);
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// Maximum profile
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"maxp": (function() {
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return stringToArray(
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"\x00\x00\x50\x00" + // Version number
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string16(charstrings.length + 1)); // Num of glyphs
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})(),
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/** NAME */
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name = stringToArray(createNameTable(fontName));
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createTableEntry(otf, offsets, "name", name);
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// Naming tables
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"name": stringToArray(createNameTable(fontName)),
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/** POST */
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post = stringToArray(createPostTable(properties));
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createTableEntry(otf, offsets, "post", post);
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// PostScript informations
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"post": stringToArray(createPostTable(properties))
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};
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// Once all the table entries header are written, dump the data!
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var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
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for (var i = 0; i < tables.length; i++) {
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var table = tables[i];
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for (var field in fields)
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createTableEntry(otf, offsets, field, fields[field]);
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for (var field in fields) {
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var table = fields[field];
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otf.set(table, offsets.currentOffset);
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offsets.currentOffset += table.length;
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}
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