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Fix Savannah bug #29846. 

Previously we discovered fonts which used `setcurrentpoint' to set
the initial point of a contour to 0,0.  This caused FreeType to
raise an error, because the `setcurrentpoint' operator is only
supposed to be used with the results from an OtherSubr subroutine.

This was fixed by simply ignoring the error and carrying on.

Now we have found a font which uses setcurrentpoint to actually
establish a non-zero point for a contour during the course of a
glyph program.  FWIW, these files may be produced by an application
called `Intaglio' on the Mac, when converting TrueType fonts to
Type 1.

The fix allows the new invalid behaviour, the old invalid behaviour
and real proper usage of the operator to work the same way as Adobe
interpreters apparently do.

(t1_decoder_parse_charstrings): Make `setcurrentpoint' use the top
two elements of the stack to establish unconditionally the current x
and y coordinates.

Make the `flex' subroutine handling (OtherSubr 0) put the current
x,y coordinates onto the stack, instead of two dummy uninitialised
values.
This commit is contained in:
Ken Sharp 2010-05-11 00:03:33 +02:00 committed by Werner Lemberg
parent 54e63755f3
commit 88169b107a
2 changed files with 33 additions and 1 deletions
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30
ChangeLog
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@ -1,5 +1,33 @@
2010-04-14 Ken Sharp <ken.sharp@artifex.com>
2010-05-10 Ken Sharp <ken.sharp@artifex.com>
Fix Savannah bug #29846.
Previously we discovered fonts which used `setcurrentpoint' to set
the initial point of a contour to 0,0. This caused FreeType to
raise an error, because the `setcurrentpoint' operator is only
supposed to be used with the results from an OtherSubr subroutine.
This was fixed by simply ignoring the error and carrying on.
Now we have found a font which uses setcurrentpoint to actually
establish a non-zero point for a contour during the course of a
glyph program. FWIW, these files may be produced by an application
called `Intaglio' on the Mac, when converting TrueType fonts to
Type 1.
The fix allows the new invalid behaviour, the old invalid behaviour
and real proper usage of the operator to work the same way as Adobe
interpreters apparently do.
(t1_decoder_parse_charstrings): Make `setcurrentpoint' use the top
two elements of the stack to establish unconditionally the current x
and y coordinates.
Make the `flex' subroutine handling (OtherSubr 0) put the current
x,y coordinates onto the stack, instead of two dummy uninitialised
values.
2010-04-14 Ken Sharp <ken.sharp@artifex.com>
Fix Savannah bug #29444.
* src/psaux/psobjs.c (t1_builder_start_point): Accept (invalid)

4
src/psaux/t1decode.c
View File

@ -777,6 +777,8 @@
}
/* the two `results' are popped by the following setcurrentpoint */
top[0] = x;
top[1] = y;
known_othersubr_result_cnt = 2;
break;
@ -1481,6 +1483,8 @@
}
else
#endif
x = top[0];
y = top[1];
decoder->flex_state = 0;
break;