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Fix for descent calculation while reading font hhea headers

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This commit is contained in:
Preetham Mysore 2016-03-02 21:10:15 -05:00
parent 51f6aba0a0
commit be1e12dbcb
4 changed files with 16 additions and 2 deletions
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9
src/core/fonts.js
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@ -722,6 +722,11 @@ var Font = (function FontClosure() {
function int16(b0, b1) {
return (b0 << 8) + b1;
}
function signedInt16(b0, b1) {
var value = (b0 << 8) + b1;
return value & (1 << 15) ? value - 0x10000 : value;
}
function int32(b0, b1, b2, b3) {
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
@ -2240,9 +2245,9 @@ var Font = (function FontClosure() {
var metricsOverride = {
unitsPerEm: int16(tables['head'].data[18], tables['head'].data[19]),
yMax: int16(tables['head'].data[42], tables['head'].data[43]),
yMin: int16(tables['head'].data[38], tables['head'].data[39]) - 0x10000,
yMin: signedInt16(tables['head'].data[38], tables['head'].data[39]),
ascent: int16(tables['hhea'].data[4], tables['hhea'].data[5]),
descent: int16(tables['hhea'].data[6], tables['hhea'].data[7]) - 0x10000
descent: signedInt16(tables['hhea'].data[6], tables['hhea'].data[7])
};
// PDF FontDescriptor metrics lie -- using data from actual font.