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Refactor 'cmap' generation

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vyv03354 2013-03-19 21:37:31 +09:00
parent b898935eb0
commit e39c34584a
3 changed files with 62 additions and 69 deletions
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122
src/fonts.js
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@ -2622,7 +2622,7 @@ var Font = (function FontClosure() {
file.virtualOffset += data.length;
}
function getRanges(glyphs) {
function getRanges(glyphs, deltas) {
// Array.sort() sorts by characters, not numerically, so convert to an
// array of characters.
var codes = [];
@ -2637,14 +2637,14 @@ var Font = (function FontClosure() {
var ranges = [];
for (var n = 0; n < length; ) {
var start = codes[n].unicode;
var codeIndices = [codes[n].code];
var codeIndices = [deltas ? deltas[codes[n].code] : codes[n].code + 1];
++n;
var end = start;
while (n < length && end + 1 == codes[n].unicode) {
codeIndices.push(codes[n].code);
codeIndices.push(deltas ? deltas[codes[n].code] : codes[n].code + 1);
++end;
++n;
if (end === 0x10000) { break; }
if (end === 0xFFFF) { break; }
}
ranges.push([start, end, codeIndices]);
}
@ -2653,7 +2653,7 @@ var Font = (function FontClosure() {
}
function createCmapTable(glyphs, deltas) {
var ranges = getRanges(glyphs);
var ranges = getRanges(glyphs, deltas);
var numTables = ranges[ranges.length - 1][1] > 0xFFFF ? 2 : 1;
var cmap = '\x00\x00' + // version
@ -2667,8 +2667,11 @@ var Font = (function FontClosure() {
}
var bmpLength = i + 1;
if (ranges[i][1] === 0xFFFF) { ranges[i][1] = 0xFFFE; }
var segCount = bmpLength + 1;
if (ranges[i][0] < 0xFFFF && ranges[i][1] === 0xFFFF) {
ranges[i][1] = 0xFFFE;
}
var trailingRangesCount = ranges[i][1] < 0xFFFF ? 1 : 0;
var segCount = bmpLength + trailingRangesCount;
var segCount2 = segCount * 2;
var searchRange = getMaxPower2(segCount) * 2;
var searchEntry = Math.log(segCount) / Math.log(2);
@ -2682,41 +2685,44 @@ var Font = (function FontClosure() {
var glyphsIds = '';
var bias = 0;
if (deltas) {
for (var i = 0, ii = bmpLength; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var end = range[1];
for (var i = 0, ii = bmpLength; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var end = range[1];
startCount += string16(start);
endCount += string16(end);
var codes = range[2];
var contiguous = true;
for (var j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
contiguous = false;
break;
}
}
if (!contiguous) {
var offset = (segCount - i) * 2 + bias * 2;
bias += (end - start + 1);
startCount += string16(start);
endCount += string16(end);
idDeltas += string16(0);
idRangeOffsets += string16(offset);
var codes = range[2];
for (var j = 0, jj = codes.length; j < jj; ++j)
glyphsIds += string16(deltas[codes[j]]);
}
} else {
for (var i = 0, ii = bmpLength; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var end = range[1];
var startCode = range[2][0];
for (var j = 0, jj = codes.length; j < jj; ++j) {
glyphsIds += string16(codes[j]);
}
} else {
var startCode = codes[0];
startCount += string16(start);
endCount += string16(end);
idDeltas += string16((startCode - start + 1) & 0xFFFF);
idDeltas += string16((startCode - start) & 0xFFFF);
idRangeOffsets += string16(0);
}
}
endCount += '\xFF\xFF';
startCount += '\xFF\xFF';
idDeltas += '\x00\x01';
idRangeOffsets += '\x00\x00';
if (trailingRangesCount > 0) {
endCount += '\xFF\xFF';
startCount += '\xFF\xFF';
idDeltas += '\x00\x01';
idRangeOffsets += '\x00\x00';
}
var format314 = '\x00\x00' + // language
string16(segCount2) +
@ -2734,46 +2740,24 @@ var Font = (function FontClosure() {
string32(4 + numTables * 8 +
4 + format314.length); // start of the table record
format31012 = '';
if (deltas) {
for (var i = 0, ii = ranges.length; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var codes = range[2];
var code = deltas[codes[0]];
for (var j = 1, jj = codes.length; j < jj; ++j) {
if (deltas[codes[j]] !== deltas[codes[j - 1]] + 1) {
var end = range[0] + j - 1;
format31012 += string32(start) + // startCharCode
string32(end) + // endCharCode
string32(code); // startGlyphID
start = end + 1;
code = deltas[codes[j]];
}
for (var i = 0, ii = ranges.length; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var codes = range[2];
var code = codes[0];
for (var j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
var end = range[0] + j - 1;
format31012 += string32(start) + // startCharCode
string32(end) + // endCharCode
string32(code); // startGlyphID
start = end + 1;
code = codes[j];
}
format31012 += string32(start) + // startCharCode
string32(range[1]) + // endCharCode
string32(code); // startGlyphID
}
} else {
for (var i = 0, ii = ranges.length; i < ii; i++) {
var range = ranges[i];
var start = range[0];
var codes = range[2];
var code = codes[0];
for (var j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
var end = range[0] + j - 1;
format31012 += string32(start) + // startCharCode
string32(end) + // endCharCode
string32(code); // startGlyphID
start = end + 1;
code = codes[j];
}
}
format31012 += string32(start) + // startCharCode
string32(range[1]) + // endCharCode
string32(code); // startGlyphID
}
format31012 += string32(start) + // startCharCode
string32(range[1]) + // endCharCode
string32(code); // startGlyphID
}
header31012 = '\x00\x0C' + // format
'\x00\x00' + // reserved