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make createCMAPTable a nested function function

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This commit is contained in:
Andreas Gal 2011-06-19 16:35:32 -07:00
parent a118f9035a
commit 4fc8a1fa75
1 changed files with 83 additions and 83 deletions
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166
fonts.js
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@ -241,88 +241,6 @@ var Font = (function () {
styleSheet.insertRule(rule, styleSheet.length);
},
_createCMAPTable: function font_createCMAPTable(aGlyphs) {
var characters = new Uint16Array(kMaxGlyphsCount);
for (var i = 0; i < aGlyphs.length; i++)
characters[aGlyphs[i].unicode] = i + 1;
// Separate the glyphs into continuous range of codes, aka segment.
var ranges = [];
var range = [];
var count = characters.length;
for (var i = 0; i < count; i++) {
if (characters[i]) {
range.push(i);
} else if (range.length) {
ranges.push(range.slice());
range = [];
}
}
// The size in bytes of the header is equal to the size of the
// different fields * length of a short + (size of the 4 parallels arrays
// describing segments * length of a short).
var headerSize = (12 * 2 + (ranges.length * 4 * 2));
var segCount = ranges.length + 1;
var segCount2 = segCount * 2;
var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
var searchEntry = Math.log(segCount) / Math.log(2);
var rangeShift = 2 * segCount - searchRange;
var cmap = [].concat(
[
0x00, 0x00, // version
0x00, 0x01, // numTables
0x00, 0x03, // platformID
0x00, 0x01, // encodingID
0x00, 0x00, 0x00, 0x0C, // start of the table record
0x00, 0x04 // format
],
FontsUtils.integerToBytes(headerSize, 2), // length
[0x00, 0x00], // language
FontsUtils.integerToBytes(segCount2, 2),
FontsUtils.integerToBytes(searchRange, 2),
FontsUtils.integerToBytes(searchEntry, 2),
FontsUtils.integerToBytes(rangeShift, 2)
);
// Fill up the 4 parallel arrays describing the segments.
var startCount = [];
var endCount = [];
var idDeltas = [];
var idRangeOffsets = [];
var glyphsIdsArray = [];
var bias = 0;
for (var i = 0; i < segCount - 1; i++) {
var range = ranges[i];
var start = FontsUtils.integerToBytes(range[0], 2);
var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
bias += range.length;
// deltas are signed shorts
delta[0] ^= 0xFF;
delta[1] ^= 0xFF;
delta[1] += 1;
startCount.push(start[0], start[1]);
endCount.push(end[0], end[1]);
idDeltas.push(delta[0], delta[1]);
idRangeOffsets.push(0x00, 0x00);
for (var j = 0; j < range.length; j++)
glyphsIdsArray.push(range[j]);
}
startCount.push(0xFF, 0xFF);
endCount.push(0xFF, 0xFF);
idDeltas.push(0x00, 0x01);
idRangeOffsets.push(0x00, 0x00);
return cmap.concat(endCount, [0x00, 0x00], startCount,
idDeltas, idRangeOffsets, glyphsIdsArray);
},
convert: function font_convert(aFont, aProperties) {
var otf = new Uint8Array(kMaxFontFileSize);
@ -392,6 +310,88 @@ var Font = (function () {
aOffsets.currentOffset += tableEntry.length;
aOffsets.virtualOffset += aData.length;
}
function createCMAPTable(aGlyphs) {
var characters = new Uint16Array(kMaxGlyphsCount);
for (var i = 0; i < aGlyphs.length; i++)
characters[aGlyphs[i].unicode] = i + 1;
// Separate the glyphs into continuous range of codes, aka segment.
var ranges = [];
var range = [];
var count = characters.length;
for (var i = 0; i < count; i++) {
if (characters[i]) {
range.push(i);
} else if (range.length) {
ranges.push(range.slice());
range = [];
}
}
// The size in bytes of the header is equal to the size of the
// different fields * length of a short + (size of the 4 parallels arrays
// describing segments * length of a short).
var headerSize = (12 * 2 + (ranges.length * 4 * 2));
var segCount = ranges.length + 1;
var segCount2 = segCount * 2;
var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
var searchEntry = Math.log(segCount) / Math.log(2);
var rangeShift = 2 * segCount - searchRange;
var cmap = [].concat(
[
0x00, 0x00, // version
0x00, 0x01, // numTables
0x00, 0x03, // platformID
0x00, 0x01, // encodingID
0x00, 0x00, 0x00, 0x0C, // start of the table record
0x00, 0x04 // format
],
FontsUtils.integerToBytes(headerSize, 2), // length
[0x00, 0x00], // language
FontsUtils.integerToBytes(segCount2, 2),
FontsUtils.integerToBytes(searchRange, 2),
FontsUtils.integerToBytes(searchEntry, 2),
FontsUtils.integerToBytes(rangeShift, 2)
);
// Fill up the 4 parallel arrays describing the segments.
var startCount = [];
var endCount = [];
var idDeltas = [];
var idRangeOffsets = [];
var glyphsIdsArray = [];
var bias = 0;
for (var i = 0; i < segCount - 1; i++) {
var range = ranges[i];
var start = FontsUtils.integerToBytes(range[0], 2);
var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
bias += range.length;
// deltas are signed shorts
delta[0] ^= 0xFF;
delta[1] ^= 0xFF;
delta[1] += 1;
startCount.push(start[0], start[1]);
endCount.push(end[0], end[1]);
idDeltas.push(delta[0], delta[1]);
idRangeOffsets.push(0x00, 0x00);
for (var j = 0; j < range.length; j++)
glyphsIdsArray.push(range[j]);
}
startCount.push(0xFF, 0xFF);
endCount.push(0xFF, 0xFF);
idDeltas.push(0x00, 0x01);
idRangeOffsets.push(0x00, 0x00);
return cmap.concat(endCount, [0x00, 0x00], startCount,
idDeltas, idRangeOffsets, glyphsIdsArray);
}
// Required Tables
var CFF = aFont.data, // PostScript Font Program
@ -469,7 +469,7 @@ var Font = (function () {
var charstrings = aFont.getOrderedCharStrings(aProperties.glyphs);
/** CMAP */
cmap = this._createCMAPTable(charstrings);
cmap = createCMAPTable(charstrings);
createTableEntry(otf, offsets, "cmap", cmap);
/** HEAD */