>
> >>> I've still not found time to have a closer look at the issue, sorry
> >>> (still on vacation more or less). Please try to debug it by
> >>> yourself also – I can only assist, since it's actually your job to
> >>> find the bug...
> >>
> >> Yes, I am working on it. If you could just give me a lead like
> >> where should I look upon and like possible sources of errors, it
> >> will be great help.
> >
> > I'm quite sure this is not a problem of `ftview'. Similarly, I'm
> > quite sure it is not a problem of FreeType's caching code either.
>
> I've now done some debugging:
>
> gdb --args /home/wl/git/freetype/freetype2-demos.parth/bin/ftstring 20
> cmr10.600gf
> (gdb) r
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff6817ea6 in __strcmp_ssse3 () from /lib64/libc.so.6
> (gdb) up
> #1 0x00000000004088af in my_face_requester (face_id=0x762110,
> lib=0x747df0, request_data=0x0, aface=0x770118) at src/ftcommon.c:239
> 239 if ( !strcmp( format, "Type 1" ) )
> (gdb) p format
> $1 = 0x0
> (gdb) l
> 234 if ( !error )
> 235 {
> 236 const char* format = FT_Get_Font_Format( *aface );
> 237
> 238
> 239 if ( !strcmp( format, "Type 1" ) )
> 240 {
> 241 char orig[5];
> 242 char* suffix = (char*)strrchr(
> font->filepathname, '.' );
> 243 int has_extension = suffix
> &&
>
> This clearly shows that the problem is in `FT_Get_Font_Format'; this
> function returns zero which looks very fishy according to its
> documentation.
>
> (gdb) b FT_Get_Font_Format
> (gdb) r
> Breakpoint 1, FT_Get_Font_Format (face=0x7703c0) at
> /home/wl/git/freetype/freetype2.parth/src/base/ftfntfmt.c:30
> 30 const char* result = NULL;
> (gdb) n
> 33 if ( face )
> (gdb)
> 34 FT_FACE_FIND_SERVICE( face, result, FONT_FORMAT );
> (gdb)
> 36 return result;
> (gdb) p result
> $2 = 0x0
>
> Obviously, there is a problem with the `FONT_FORMAT' service in the GF
> driver; let's check the winfnt driver for comparison.
>
> cd winfonts
> git grep FONT_FORMAT
> winfnt.c:#include FT_SERVICE_FONT_FORMAT_H
> winfnt.c: { FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_WINFNT },
>
> cd gf
> git grep FONT_FORMAT
> gfdrivr.c:#include FT_SERVICE_FONT_FORMAT_H
>
> Ouch, the service is completely missing...
>
> Tadaa!
>
> Have a look into `include/freetype/internal/services/svfntfmt.h'.
>
Yes! indeed! Thank you so much for that.
> Please tell me why you wasn't able to identify the problem by
> yourself!
Actually, I thought that these services are not a regular part of the module
and are defined only if there are functions of the driver required outside
the
driver, so I did not define them. But, I was unaware that the services are
used by the demo program. As I was first debugging with `ftview' and I was
going function by function to debug it and I was stuck at the `FTC'
functions.
Then when you told to debug through `ftstring', I thought to do it later
as I was in middle of learning about the `vf' fonts.
> Perhaps there is some missing documentation or a missing
> explanatory comment in the code...
>
Yes. I think so too.
Thank you
Parth
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