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Extend Adobe interpreter (div, four-byte numbers).

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* src/psaux/psintrp.c (cf2_interpT2CharString) <cf2_escDIV>: Add
Type 1 mode.  Type 1 requires large integers to be followed by
`div'; cf. `Adobe Type 1 Font Format', section 6.2.
<op == 255>: Push Type 1 four-byte numbers as `Int' always.  This is
to ensure `div' and `callsubr' get values they can use.
This commit is contained in:
Ewald Hew 2017-09-25 07:44:56 +02:00 committed by Werner Lemberg
parent 81b86c459c
commit 4b58c518c9
2 changed files with 56 additions and 7 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2017-09-25 Ewald Hew <ewaldhew@gmail.com>
[psaux] Extend Adobe interpreter (div, four-byte numbers).
* src/psaux/psintrp.c (cf2_interpT2CharString) <cf2_escDIV>: Add
Type 1 mode. Type 1 requires large integers to be followed by
`div'; cf. `Adobe Type 1 Font Format', section 6.2.
<op == 255>: Push Type 1 four-byte numbers as `Int' always. This is
to ensure `div' and `callsubr' get values they can use.
2017-09-25 Ewald Hew <ewaldhew@gmail.com>
Extend Adobe interpreter (hints).

53
src/psaux/psintrp.c
View File

@ -491,7 +491,7 @@
/* Stuff for Type 1 */
FT_Int known_othersubr_result_cnt = 0;
FT_Int unknown_othersubr_result_cnt = 0;
FT_Bool large_int;
FT_Bool large_int = FALSE;
/* save this for hinting seac accents */
CF2_Fixed hintOriginY = curY;
@ -1389,14 +1389,22 @@
FT_TRACE4(( " div\n" ));
divisor = cf2_stack_popFixed( opStack );
dividend = cf2_stack_popFixed( opStack );
if ( font->isT1 && large_int )
{
divisor = (CF2_F16Dot16)cf2_stack_popInt( opStack );
dividend = (CF2_F16Dot16)cf2_stack_popInt( opStack );
large_int = FALSE;
}
else
{
divisor = cf2_stack_popFixed( opStack );
dividend = cf2_stack_popFixed( opStack );
}
cf2_stack_pushFixed( opStack,
FT_DivFix( dividend, divisor ) );
if ( font->isT1 )
large_int = FALSE;
}
continue; /* do not clear the stack */
@ -2237,9 +2245,40 @@
( byte3 << 8 ) |
byte4 );
FT_TRACE4(( " %.5f", v / 65536.0 ));
/* For Type 1: */
/* According to the specification, values > 32000 or < -32000 must */
/* be followed by a `div' operator to make the result be in the */
/* range [-32000;32000]. We expect that the second argument of */
/* `div' is not a large number. Additionally, we don't handle */
/* stuff like `<large1> <large2> <num> div <num> div' or */
/* <large1> <large2> <num> div div'. This is probably not allowed */
/* anyway. */
/* <large> <num> <num>+ div is not checked but should not be */
/* allowed as the large value remains untouched. */
if ( font->isT1 )
{
if ( v > 32000 || v < -32000 )
{
if ( large_int )
{
FT_ERROR(( "cf2_interpT2CharString (Type 1 mode):"
" no `div' after large integer\n" ));
}
else
large_int = TRUE;
}
FT_TRACE4(( " %d", v ));
cf2_stack_pushInt( opStack, (CF2_Int)v );
}
else
{
FT_TRACE4(( " %.5fF", v / 65536.0 ));
cf2_stack_pushFixed( opStack, v );
}
cf2_stack_pushFixed( opStack, v );
}
}
continue; /* don't clear stack */