make createCMAPTable a nested function function
This commit is contained in:
Andreas Gal
parent
a118f9035a
commit
4fc8a1fa75
166
fonts.js
166
fonts.js
@ -241,88 +241,6 @@ var Font = (function () {
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styleSheet.insertRule(rule, styleSheet.length);
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styleSheet.insertRule(rule, styleSheet.length);
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},
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},
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_createCMAPTable: function font_createCMAPTable(aGlyphs) {
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var characters = new Uint16Array(kMaxGlyphsCount);
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for (var i = 0; i < aGlyphs.length; i++)
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characters[aGlyphs[i].unicode] = i + 1;
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// Separate the glyphs into continuous range of codes, aka segment.
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var ranges = [];
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var range = [];
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var count = characters.length;
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for (var i = 0; i < count; i++) {
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if (characters[i]) {
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range.push(i);
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} else if (range.length) {
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ranges.push(range.slice());
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range = [];
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}
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}
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// The size in bytes of the header is equal to the size of the
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// different fields * length of a short + (size of the 4 parallels arrays
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// describing segments * length of a short).
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var headerSize = (12 * 2 + (ranges.length * 4 * 2));
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var segCount = ranges.length + 1;
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var segCount2 = segCount * 2;
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var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
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var searchEntry = Math.log(segCount) / Math.log(2);
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var rangeShift = 2 * segCount - searchRange;
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var cmap = [].concat(
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[
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0x00, 0x00, // version
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0x00, 0x01, // numTables
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0x00, 0x03, // platformID
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0x00, 0x01, // encodingID
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0x00, 0x00, 0x00, 0x0C, // start of the table record
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0x00, 0x04 // format
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],
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FontsUtils.integerToBytes(headerSize, 2), // length
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[0x00, 0x00], // language
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FontsUtils.integerToBytes(segCount2, 2),
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FontsUtils.integerToBytes(searchRange, 2),
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FontsUtils.integerToBytes(searchEntry, 2),
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FontsUtils.integerToBytes(rangeShift, 2)
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);
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// Fill up the 4 parallel arrays describing the segments.
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var startCount = [];
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var endCount = [];
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var idDeltas = [];
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var idRangeOffsets = [];
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var glyphsIdsArray = [];
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var bias = 0;
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for (var i = 0; i < segCount - 1; i++) {
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var range = ranges[i];
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var start = FontsUtils.integerToBytes(range[0], 2);
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var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
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var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
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bias += range.length;
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// deltas are signed shorts
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delta[0] ^= 0xFF;
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delta[1] ^= 0xFF;
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delta[1] += 1;
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startCount.push(start[0], start[1]);
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endCount.push(end[0], end[1]);
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idDeltas.push(delta[0], delta[1]);
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idRangeOffsets.push(0x00, 0x00);
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for (var j = 0; j < range.length; j++)
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glyphsIdsArray.push(range[j]);
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}
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startCount.push(0xFF, 0xFF);
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endCount.push(0xFF, 0xFF);
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idDeltas.push(0x00, 0x01);
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idRangeOffsets.push(0x00, 0x00);
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return cmap.concat(endCount, [0x00, 0x00], startCount,
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idDeltas, idRangeOffsets, glyphsIdsArray);
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},
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convert: function font_convert(aFont, aProperties) {
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convert: function font_convert(aFont, aProperties) {
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var otf = new Uint8Array(kMaxFontFileSize);
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var otf = new Uint8Array(kMaxFontFileSize);
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@ -393,6 +311,88 @@ var Font = (function () {
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aOffsets.virtualOffset += aData.length;
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aOffsets.virtualOffset += aData.length;
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}
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}
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function createCMAPTable(aGlyphs) {
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var characters = new Uint16Array(kMaxGlyphsCount);
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for (var i = 0; i < aGlyphs.length; i++)
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characters[aGlyphs[i].unicode] = i + 1;
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// Separate the glyphs into continuous range of codes, aka segment.
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var ranges = [];
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var range = [];
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var count = characters.length;
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for (var i = 0; i < count; i++) {
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if (characters[i]) {
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range.push(i);
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} else if (range.length) {
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ranges.push(range.slice());
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range = [];
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}
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}
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// The size in bytes of the header is equal to the size of the
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// different fields * length of a short + (size of the 4 parallels arrays
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// describing segments * length of a short).
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var headerSize = (12 * 2 + (ranges.length * 4 * 2));
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var segCount = ranges.length + 1;
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var segCount2 = segCount * 2;
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var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
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var searchEntry = Math.log(segCount) / Math.log(2);
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var rangeShift = 2 * segCount - searchRange;
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var cmap = [].concat(
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[
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0x00, 0x00, // version
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0x00, 0x01, // numTables
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0x00, 0x03, // platformID
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0x00, 0x01, // encodingID
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0x00, 0x00, 0x00, 0x0C, // start of the table record
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0x00, 0x04 // format
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],
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FontsUtils.integerToBytes(headerSize, 2), // length
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[0x00, 0x00], // language
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FontsUtils.integerToBytes(segCount2, 2),
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FontsUtils.integerToBytes(searchRange, 2),
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FontsUtils.integerToBytes(searchEntry, 2),
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FontsUtils.integerToBytes(rangeShift, 2)
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);
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// Fill up the 4 parallel arrays describing the segments.
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var startCount = [];
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var endCount = [];
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var idDeltas = [];
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var idRangeOffsets = [];
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var glyphsIdsArray = [];
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var bias = 0;
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for (var i = 0; i < segCount - 1; i++) {
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var range = ranges[i];
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var start = FontsUtils.integerToBytes(range[0], 2);
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var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
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var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
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bias += range.length;
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// deltas are signed shorts
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delta[0] ^= 0xFF;
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delta[1] ^= 0xFF;
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delta[1] += 1;
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startCount.push(start[0], start[1]);
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endCount.push(end[0], end[1]);
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idDeltas.push(delta[0], delta[1]);
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idRangeOffsets.push(0x00, 0x00);
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for (var j = 0; j < range.length; j++)
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glyphsIdsArray.push(range[j]);
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}
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startCount.push(0xFF, 0xFF);
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endCount.push(0xFF, 0xFF);
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idDeltas.push(0x00, 0x01);
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idRangeOffsets.push(0x00, 0x00);
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return cmap.concat(endCount, [0x00, 0x00], startCount,
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idDeltas, idRangeOffsets, glyphsIdsArray);
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}
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// Required Tables
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// Required Tables
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var CFF = aFont.data, // PostScript Font Program
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var CFF = aFont.data, // PostScript Font Program
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OS2 = [], // OS/2 and Windows Specific metrics
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OS2 = [], // OS/2 and Windows Specific metrics
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@ -469,7 +469,7 @@ var Font = (function () {
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var charstrings = aFont.getOrderedCharStrings(aProperties.glyphs);
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var charstrings = aFont.getOrderedCharStrings(aProperties.glyphs);
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/** CMAP */
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/** CMAP */
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cmap = this._createCMAPTable(charstrings);
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cmap = createCMAPTable(charstrings);
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createTableEntry(otf, offsets, "cmap", cmap);
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createTableEntry(otf, offsets, "cmap", cmap);
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/** HEAD */
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/** HEAD */
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