Sakurai/pdf.js
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use Array.sort to calculate glyph ranges instead of large typed arrays

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This commit is contained in:
Andreas Gal 2011-06-20 03:33:52 -04:00
parent fc4ca2a9dd
commit 52e1631030
1 changed files with 21 additions and 20 deletions
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41
fonts.js
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@ -8,11 +8,6 @@
*/
var kMaxFontFileSize = 40000;
/**
* Maximum number of glyphs per font.
*/
var kMaxGlyphsCount = 65526;
/**
* Maximum time to wait for a font to be loaded by @font-face
*/
@ -310,24 +305,30 @@ 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.
function getRanges(glyphs) {
// Array.sort() sorts by characters, not numerically, so convert to an
// array of characters.
var codes = [];
var length = glyphs.length;
for (var n = 0; n < length; ++n)
codes.push(String.fromCharCode(glyphs[n].unicode))
codes.sort();
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 = [];
}
for (var n = 0; n < length; ) {
var range = [];
do {
var current = codes[n++].charCodeAt(0);
range.push(current);
} while (n < length && current + 1 == codes[n].charCodeAt(0));
ranges.push(range);
}
return ranges;
}
function createCMAPTable(aGlyphs) {
var ranges = getRanges(aGlyphs);
// 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