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[truetype] Add comment to explain heuristic limit for twilight points.

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This commit is contained in:
Werner Lemberg
2025-06-24 13:31:10 +02:00
parent 43940e4cb8
commit 58be4879c5
1 changed files with 3 additions and 0 deletions
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src/truetype/ttinterp.c
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@@ -7424,6 +7424,9 @@
/* We restrict the number of twilight points to a reasonable, */
/* heuristic value to avoid slow execution of malformed bytecode. */
/* The selected value is large enough to support fonts hinted */
/* with `ttfautohint`, which uses twilight points to store */
/* vertical coordinates of (auto-hinter) segments. */
num_twilight_points = FT_MAX( 30,
2 * ( exec->pts.n_points + exec->cvtSize ) );
if ( exec->twilight.n_points > num_twilight_points )