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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 631b5df2c3
commit b827da304f
1 changed files with 83 additions and 83 deletions
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144
fonts.js
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@ -241,7 +241,77 @@ var Font = (function () {
styleSheet.insertRule(rule, styleSheet.length);
},
_createCMAPTable: function font_createCMAPTable(aGlyphs) {
convert: function font_convert(aFont, aProperties) {
var otf = new Uint8Array(kMaxFontFileSize);
function s2a(s) {
var a = [];
for (var i = 0; i < s.length; ++i)
a[i] = s.charCodeAt(i);
return a;
}
function s16(value) {
return String.fromCharCode(value >> 8) + String.fromCharCode(value & 0xff);
}
function createOpenTypeHeader(aFile, aOffsets, numTables) {
var header = "";
// sfnt version (4 bytes)
header += "\x4F\x54\x54\x4F";
// numTables (2 bytes)
header += s16(numTables);
// searchRange (2 bytes)
var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
var searchRange = tablesMaxPower2 * 16;
header += s16(searchRange);
// entrySelector (2 bytes)
header += s16(Math.log(tablesMaxPower2) / Math.log(2));
// rangeShift (2 bytes)
header += s16(numTables * 16 - searchRange);
aFile.set(s2a(header), aOffsets.currentOffset);
aOffsets.currentOffset += header.length;
aOffsets.virtualOffset += header.length;
}
function createTableEntry(aFile, aOffsets, aTag, aData) {
// tag
var tag = [
aTag.charCodeAt(0),
aTag.charCodeAt(1),
aTag.charCodeAt(2),
aTag.charCodeAt(3)
];
// offset
var offset = aOffsets.virtualOffset;
// Per spec tables must be 4-bytes align so add some 0x00 if needed
while (aData.length & 3)
aData.push(0x00);
// length
var length = aData.length;
// checksum
var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
var tableEntry = [].concat(tag,
FontsUtils.integerToBytes(checksum, 4),
FontsUtils.integerToBytes(offset, 4),
FontsUtils.integerToBytes(length, 4));
aFile.set(tableEntry, aOffsets.currentOffset);
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;
@ -321,76 +391,6 @@ var Font = (function () {
return cmap.concat(endCount, [0x00, 0x00], startCount,
idDeltas, idRangeOffsets, glyphsIdsArray);
},
convert: function font_convert(aFont, aProperties) {
var otf = new Uint8Array(kMaxFontFileSize);
function s2a(s) {
var a = [];
for (var i = 0; i < s.length; ++i)
a[i] = s.charCodeAt(i);
return a;
}
function s16(value) {
return String.fromCharCode(value >> 8) + String.fromCharCode(value & 0xff);
}
function createOpenTypeHeader(aFile, aOffsets, numTables) {
var header = "";
// sfnt version (4 bytes)
header += "\x4F\x54\x54\x4F";
// numTables (2 bytes)
header += s16(numTables);
// searchRange (2 bytes)
var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
var searchRange = tablesMaxPower2 * 16;
header += s16(searchRange);
// entrySelector (2 bytes)
header += s16(Math.log(tablesMaxPower2) / Math.log(2));
// rangeShift (2 bytes)
header += s16(numTables * 16 - searchRange);
aFile.set(s2a(header), aOffsets.currentOffset);
aOffsets.currentOffset += header.length;
aOffsets.virtualOffset += header.length;
}
function createTableEntry(aFile, aOffsets, aTag, aData) {
// tag
var tag = [
aTag.charCodeAt(0),
aTag.charCodeAt(1),
aTag.charCodeAt(2),
aTag.charCodeAt(3)
];
// offset
var offset = aOffsets.virtualOffset;
// Per spec tables must be 4-bytes align so add some 0x00 if needed
while (aData.length & 3)
aData.push(0x00);
// length
var length = aData.length;
// checksum
var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
var tableEntry = [].concat(tag,
FontsUtils.integerToBytes(checksum, 4),
FontsUtils.integerToBytes(offset, 4),
FontsUtils.integerToBytes(length, 4));
aFile.set(tableEntry, aOffsets.currentOffset);
aOffsets.currentOffset += tableEntry.length;
aOffsets.virtualOffset += aData.length;
}
// Required Tables
@ -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 */