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Fixes searchRange calculation

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This commit is contained in:
Yury Delendik 2014-08-10 13:51:09 -05:00
parent 42771159ca
commit ab8270ae3a
1 changed files with 7 additions and 17 deletions
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24
src/core/fonts.js
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@ -2224,21 +2224,6 @@ var IdentityToUnicodeMap = (function IdentityToUnicodeMapClosure() {
})(); })();
var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() { var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
function getMaxPower2(number) {
var maxPower = 0;
var value = number;
while (value >= 2) {
value /= 2;
maxPower++;
}
value = 2;
for (var i = 1; i < maxPower; i++) {
value *= 2;
}
return value;
}
function writeInt16(dest, offset, num) { function writeInt16(dest, offset, num) {
dest[offset] = (num >> 8) & 0xFF; dest[offset] = (num >> 8) & 0xFF;
dest[offset + 1] = num & 0xFF; dest[offset + 1] = num & 0xFF;
@ -2274,10 +2259,15 @@ var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
OpenTypeFileBuilder.getSearchParams = OpenTypeFileBuilder.getSearchParams =
function OpenTypeFileBuilder_getSearchParams(entriesCount, entrySize) { function OpenTypeFileBuilder_getSearchParams(entriesCount, entrySize) {
var searchRange = getMaxPower2(entriesCount) * entrySize; var maxPower2 = 1, log2 = 0;
while ((maxPower2 ^ entriesCount) > maxPower2) {
maxPower2 <<= 1;
log2++;
}
var searchRange = maxPower2 * entrySize;
return { return {
range: searchRange, range: searchRange,
entry: (Math.log(entriesCount) / Math.log(2)) | 0, entry: log2,
rangeShift: entrySize * entriesCount - searchRange rangeShift: entrySize * entriesCount - searchRange
}; };
}; };