Clean up a bit the code to generate an OTF
This commit is contained in:
Vivien Nicolas
parent
cebdda3f35
commit
c6f5385d15
209
PDFFont.js
209
PDFFont.js
@ -95,7 +95,7 @@ Font.prototype = {
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styleSheet.insertRule(rule, styleSheet.length);
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},
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_createOpenTypeHeader: function font_createOpenTypeHeader(aNumTables) {
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_createOpenTypeHeader: function font_createOpenTypeHeader(aFile, aOffsets, aNumTables) {
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// sfnt version (4 bytes)
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var version = [0x4F, 0x54, 0x54, 0X4F];
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@ -112,14 +112,17 @@ Font.prototype = {
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// rangeShift (2 bytes)
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var rangeShift = numTables * 16 - searchRange;
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return [].concat(version,
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FontsUtils.integerToBytes(numTables, 2),
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FontsUtils.integerToBytes(searchRange, 2),
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FontsUtils.integerToBytes(entrySelector, 2),
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FontsUtils.integerToBytes(rangeShift, 2));
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var header = [].concat(version,
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FontsUtils.integerToBytes(numTables, 2),
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FontsUtils.integerToBytes(searchRange, 2),
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FontsUtils.integerToBytes(entrySelector, 2),
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FontsUtils.integerToBytes(rangeShift, 2));
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aFile.set(header, aOffsets.currentOffset);
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aOffsets.currentOffset += header.length;
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aOffsets.virtualOffset += header.length;
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},
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_createTableEntry: function font_createTableEntry(aTag, aOffset, aData) {
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_createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) {
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// tag
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var tag = [
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aTag.charCodeAt(0),
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@ -129,7 +132,7 @@ Font.prototype = {
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];
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// offset
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var offset = aOffset;
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var offset = aOffsets.virtualOffset;
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// Per spec tables must be 4-bytes align so add some 0x00 if needed
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while (aData.length & 3)
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@ -141,10 +144,13 @@ Font.prototype = {
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// checksum
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var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
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return [].concat(tag,
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FontsUtils.integerToBytes(checksum, 4),
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FontsUtils.integerToBytes(offset, 4),
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FontsUtils.integerToBytes(length, 4));
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var tableEntry = [].concat(tag,
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FontsUtils.integerToBytes(checksum, 4),
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FontsUtils.integerToBytes(offset, 4),
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FontsUtils.integerToBytes(length, 4));
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aFile.set(tableEntry, aOffsets.currentOffset);
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aOffsets.currentOffset += tableEntry.length;
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aOffsets.virtualOffset += aData.length;
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},
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_createCMAPTable: function font_createCMAPTable(aGlyphs) {
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@ -230,23 +236,39 @@ Font.prototype = {
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cover: function font_cover(aFont) {
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var otf = new Uint8Array(kMaxFontFileSize);
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var aFontData = aFont.data;
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var currentOffset = 0;
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var numTables = 9;
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//var tables = [OS2, cmap, head, hhea, hmtx, maxp, name, post];
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var header = this._createOpenTypeHeader(numTables);
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otf.set(header, currentOffset);
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currentOffset += header.length;
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// Required Tables
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var CFF = aFont.data,
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OS2 = [],
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cmap = [],
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head = [],
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hhea = [],
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hmtx = [],
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maxp = [],
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name = [],
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post = [];
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var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
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var baseOffset = numTables * (4 * 4) + currentOffset;
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var virtualOffset = baseOffset;
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var tableEntry = this._createTableEntry("CFF ", virtualOffset, aFontData);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += aFontData.length;
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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 offsets = {
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currentOffset: 0,
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virtualOffset: tables.length * (4 * 4)
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};
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var OS2 = [
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// For files with only one font the offset table is the first thing of the
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// file
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this._createOpenTypeHeader(otf, offsets, tables.length);
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// XXX It is probable that in a future we want to get rid of this glue
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// between the CFF and the OTF format in order to be able to embed TrueType
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// data.
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this._createTableEntry(otf, offsets, "CFF ", CFF);
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/** OS/2 */
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OS2 = [
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0x00, 0x03, // version
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0x02, 0x24, // xAvgCharWidth
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0x01, 0xF4, // usWeightClass
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@ -268,7 +290,7 @@ Font.prototype = {
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange2 (Bits 32-63)
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange3 (Bits 64-95)
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange4 (Bits 96-127)
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0x47, 0x49, 0x60, 0x20, // achVendID
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0x2A, 0x32, 0x31, 0x2A, // achVendID
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0x00, 0x20, // fsSelection
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0x00, 0x2D, // usFirstCharIndex
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0x00, 0x7A, // usLastCharIndex
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@ -285,25 +307,17 @@ Font.prototype = {
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0x00, 0xCD, // usBreakChar
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0x00, 0x02 // usMaxContext
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];
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this._createTableEntry(otf, offsets, "OS/2", OS2);
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var tableEntry = this._createTableEntry("OS/2", virtualOffset, OS2);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += OS2.length;
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/** CMAP */
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//XXX Getting charstrings here seems wrong since this is another CFF glue
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var charstrings = aFont.getOrderedCharStrings(aFont.font);
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var cmap = this._createCMAPTable(charstrings);
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var tableEntry = this._createTableEntry("cmap", virtualOffset, cmap);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += cmap.length;
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/** CMAP */
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cmap = this._createCMAPTable(charstrings);
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this._createTableEntry(otf, offsets, "cmap", cmap);
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/** HEAD */
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var head = [
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head = [
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0x00, 0x01, 0x00, 0x00, // Version number
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0x00, 0x00, 0x50, 0x00, // fontRevision
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0x00, 0x00, 0x00, 0x00, // checksumAdjustement
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@ -322,84 +336,63 @@ Font.prototype = {
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0x00, 0x00, // indexToLocFormat
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0x00, 0x00 // glyphDataFormat
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];
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var tableEntry = this._createTableEntry("head", virtualOffset, head);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += head.length;
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this._createTableEntry(otf, offsets, "head", head);
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/** HHEA */
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var hhea = [
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0x00, 0x01, 0x00, 0x00, // Version number
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0x00, 0x00, // Typographic Ascent
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0x00, 0x00, // Typographic Descent
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0x00, 0x00, // Line Gap
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0xFF, 0xFF, // advanceWidthMax
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0x00, 0x00, // minLeftSidebearing
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0x00, 0x00, // minRightSidebearing
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0x00, 0x00, // xMaxExtent
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0x00, 0x00, // caretSlopeRise
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0x00, 0x00, // caretSlopeRun
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0x00, 0x00, // caretOffset
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00 // metricDataFormat
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];
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hhea = hhea.concat(FontsUtils.integerToBytes(charstrings.length, 2)); // numberOfHMetrics
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var tableEntry = this._createTableEntry("hhea", virtualOffset, hhea);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += hhea.length;
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hhea = [].concat(
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[
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0x00, 0x01, 0x00, 0x00, // Version number
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0x00, 0x00, // Typographic Ascent
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0x00, 0x00, // Typographic Descent
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0x00, 0x00, // Line Gap
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0xFF, 0xFF, // advanceWidthMax
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0x00, 0x00, // minLeftSidebearing
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0x00, 0x00, // minRightSidebearing
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0x00, 0x00, // xMaxExtent
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0x00, 0x00, // caretSlopeRise
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0x00, 0x00, // caretSlopeRun
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0x00, 0x00, // caretOffset
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00 // metricDataFormat
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],
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FontsUtils.integerToBytes(charstrings.length, 2) // numberOfHMetrics
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);
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this._createTableEntry(otf, offsets, "hhea", hhea);
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/** HMTX */
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var hmtx = [0x01, 0xF4, 0x00, 0x00];
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hmtx = [0x01, 0xF4, 0x00, 0x00];
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for (var i = 0; i < charstrings.length; i++) {
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// XXX this can easily broke
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var charstring = charstrings[i].charstring;
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var width = FontsUtils.integerToBytes(charstring[1], 2);
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var lsb = FontsUtils.integerToBytes(charstring[0], 2);
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hmtx = hmtx.concat(width, lsb);
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}
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var tableEntry = this._createTableEntry("hmtx", virtualOffset, hmtx);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += hmtx.length;
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this._createTableEntry(otf, offsets, "hmtx", hmtx);
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/** MAXP */
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var maxp = [
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0x00, 0x00, 0x50, 0x00, // Version number
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].concat(FontsUtils.integerToBytes(charstrings.length + 1, 2)); // Num of glyphs (+1 to pass the sanitizer...)
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var tableEntry = this._createTableEntry("maxp", virtualOffset, maxp);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += maxp.length;
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maxp = [].concat(
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[
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0x00, 0x00, 0x50, 0x00, // Version number
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],
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FontsUtils.integerToBytes(charstrings.length + 1, 2) // Num of glyphs (+1 to pass the sanitizer...)
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);
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this._createTableEntry(otf, offsets, "maxp", maxp);
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/** NAME */
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var name = [
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name = [
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0x00, 0x00, // format
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0x00, 0x00, // Number of names Record
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0x00, 0x00 // Storage
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0x00, 0x00 // Storage
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];
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var tableEntry = this._createTableEntry("name", virtualOffset, name);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += name.length;
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this._createTableEntry(otf, offsets, "name", name);
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/** POST */
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// XXX get those info from the Font dict!
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var post = [
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post = [
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0x00, 0x03, 0x00, 0x00, // Version number
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0x00, 0x00, 0x01, 0x00, // italicAngle
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0x00, 0x00, // underlinePosition
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@ -410,24 +403,18 @@ Font.prototype = {
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0x00, 0x00, 0x00, 0x00, // minMemType1
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0x00, 0x00, 0x00, 0x00 // maxMemType1
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];
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var tableEntry = this._createTableEntry("post", virtualOffset, post);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += post.length;
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this._createTableEntry(otf, offsets, "post", post);
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// Set the CFF data
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otf.set(aFontData, currentOffset);
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currentOffset += aFontData.length;
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var tables = [OS2, cmap, head, hhea, hmtx, maxp, name, post];
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// Once all the table entry are written, this is time to 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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otf.set(table, currentOffset);
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currentOffset += table.length;
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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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var fontData = [];
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for (var i = 0; i < currentOffset; i++)
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for (var i = 0; i < offsets.currentOffset; i++)
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fontData.push(otf[i]);
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writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".otf");
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