AuroraMiddleware/harfbuzz
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Fix Context lookup application when moving back after a glyph delete

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This was broken forever, since days that we did not allow moving
tape backwards. Works now. Reported by Doug Felt.
This commit is contained in:
Behdad Esfahbod 2017-03-01 14:27:23 -08:00
parent a11501444c
commit b9b005f3a4
3 changed files with 4 additions and 4 deletions
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7
src/hb-ot-layout-gsubgpos-private.hh
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@ -999,14 +999,13 @@ static inline bool apply_lookup (hb_apply_context_t *c,
/* Recursed lookup changed buffer len. Adjust. */
end += delta;
if (end <= int (match_positions[idx]))
if (end < int (match_positions[idx]))
{
/* End might end up being smaller than match_positions[idx] if the recursed
* lookup ended up removing many items, more than we have had matched.
* lookup ended up removing too many items.
* Just never rewind end back and get out of here.
* https://bugs.chromium.org/p/chromium/issues/detail?id=659496 */
end = match_positions[idx];
/* There can't be any further changes. */
break;
}
@ -1019,7 +1018,7 @@ static inline bool apply_lookup (hb_apply_context_t *c,
}
else
{
/* NOTE: delta is negative. */
/* NOTE: delta is non-positive. */
delta = MAX (delta, (int) next - (int) count);
next -= delta;
}

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test/shaping/fonts/sha1sum/5bbf3712e6f79775c66a4407837a90e591efbef2.ttf Normal file
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1
test/shaping/tests/context-matching.tests
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@ -1,3 +1,4 @@
fonts/sha1sum/4cce528e99f600ed9c25a2b69e32eb94a03b4ae8.ttf::U+1A48,U+1A58,U+1A25,U+1A48,U+1A58,U+1A25,U+1A6E,U+1A63:[uni1A48=0+1212|uni1A25=0+1912|uni1A58=0+0|uni1A48=3+1212|uni1A6E=3+0|uni1A25=3+1912|uni1A58=3+0|uni1A63=3+1212]
fonts/sha1sum/d629e7fedc0b350222d7987345fe61613fa3929a.ttf::U+0915,U+093F,U+0915,U+093F:[ivowelsign03deva=0+530|kadeva=0+1561|ivowelsign03deva=2+530|kadeva=2+1561]
fonts/sha1sum/f499fbc23865022234775c43503bba2e63978fe1.ttf::U+09B0,U+09CD,U+09A5,U+09CD,U+09AF,U+09C0:[gid1=0+1320|gid13=0+523|gid18=0+545]
fonts/sha1sum/5bbf3712e6f79775c66a4407837a90e591efbef2.ttf:--font-funcs=ot:U+1F1FA,U+1F1FC:[gid3=0+2550]