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Fix reading number of HTMX metrics.

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The length of the HHEA table can be incorrect, so it is better to
read the number of metrics offset from beginning of table instead.
This commit is contained in:
Brendan Dahl 2019-01-04 15:13:13 -08:00
parent b39ec7af96
commit 32eace043b
4 changed files with 20 additions and 1 deletions
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14
src/core/fonts.js
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@ -1613,7 +1613,19 @@ var Font = (function FontClosure() {
}
font.pos = (font.start ? font.start : 0) + header.offset;
font.pos += header.length - 2;
font.pos += 4; // version
font.pos += 2; // ascent
font.pos += 2; // descent
font.pos += 2; // linegap
font.pos += 2; // adv_width_max
font.pos += 2; // min_sb1
font.pos += 2; // min_sb2
font.pos += 2; // max_extent
font.pos += 2; // caret_slope_rise
font.pos += 2; // caret_slope_run
font.pos += 2; // caret_offset
font.pos += 8; // reserved
font.pos += 2; // format
var numOfMetrics = font.getUint16();
if (numOfMetrics > numGlyphs) {