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[truetype] Limit INSTCTRL appication within specs.

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* src/truetype/ttinterp.c (Ins_INSTCTRL): Limit its global effects
to the CVT program and local effects to the glyph program.

This also fixes an Infinality buglet. The `ignore_x_mode` should be
locally unset by the glyph program.
This commit is contained in:
Alexei Podtelezhnikov 2021-12-11 22:12:25 -05:00
parent bad92be927
commit a35b081ebc
1 changed files with 11 additions and 4 deletions
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15
src/truetype/ttinterp.c
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@ -5260,16 +5260,21 @@
}
}
exc->GS.instruct_control &= ~(FT_Byte)Kf;
exc->GS.instruct_control |= (FT_Byte)L;
/* INSTCTRL should only be used in the CVT program */
if ( exc->iniRange == tt_coderange_cvt )
{
exc->GS.instruct_control &= ~(FT_Byte)Kf;
exc->GS.instruct_control |= (FT_Byte)L;
}
if ( K == 3 )
/* except to change the subpixel flags temporarily */
else if ( exc->iniRange == tt_coderange_glyph && K == 3 )
{
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
/* INSTCTRL modifying flag 3 also has an effect */
/* outside of the CVT program */
if ( SUBPIXEL_HINTING_INFINALITY )
exc->ignore_x_mode = FT_BOOL( L == 4 );
exc->ignore_x_mode = !FT_BOOL( L == 4 );
#endif
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
@ -5280,6 +5285,8 @@
exc->backward_compatibility = !FT_BOOL( L == 4 );
#endif
}
else if ( exc->pedantic_hinting )
exc->error = FT_THROW( Invalid_Reference );
}