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[smooth] Limit acceptable glyph complexity.

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* src/smooth/ftgrays.c (gray_convert_glyph): Do not attempt to draw
glyphs with taxicab:cbox perimeter ratio above 20.
This commit is contained in:
Alexei Podtelezhnikov 2023-10-09 22:39:27 -04:00
parent 7bdd4d1a00
commit 819d73f658
1 changed files with 14 additions and 3 deletions
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17
src/smooth/ftgrays.c
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@ -2011,9 +2011,20 @@ typedef ptrdiff_t FT_PtrDist;
int continued = 0;
size = gray_taxi( RAS_VAR ) +
height * sizeof ( PCell ) / sizeof ( TCell ) +
9; /* empirical extra for local extrema */
size = gray_taxi( RAS_VAR );
/* taxicab perimeters in excess of 20 CBox perimeters are */
/* not drawn unless in direct mode with possible clipping */
if ( !ras.render_span &&
size > 20 * 2 * ( ras.max_ex - ras.min_ex + height ) )
{
FT_TRACE5(( "Blanking on taxi:cbox = %.2lf\n",
0.5 * size / ( ras.max_ex - ras.min_ex + height ) ));
return FT_THROW( Ok );
}
size += height * sizeof ( PCell ) / sizeof ( TCell ) +
9; /* empirical extra for local extrema */
if ( FT_QNEW_ARRAY( buffer, size ) )
return error;