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April 2006
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2006.04.04 03:28 "Re: New OJPEG support", by Bob Friesenhahn
On Tue, 4 Apr 2006, Joris wrote:
>
> - I've not been able to test the longjump way to call LibJpeg
> functions... Some environments don't support longjump. This includes my
> own LibTiffDelphi build. Thus, I've included an alternative way of
> calling, triggered by the optional define LIBJPEG_ENCAP_EXTERNAL. If you
> define that, LibJpeg doesn't get called directly, but you have a chance
> to implement dedicated call encapsulators outside of tif_ojpeg.c. The
> use with this LIBJPEG_ENCAP_EXTERNAL is tested, but the default, direct
> longjump call usage without LIBJPEG_ENCAP_EXTERNAL is not. I must depend
> on you to do that and report any problems. Default is normal longjump,
> so you likely don't need to change anything.
Looks like you need to do
#include <setjmp.h>
in order to obtain a definition for jmp_buf. Otherwise compilation
fails at
JMP_BUF exit_jmpbuf;
This is ANSI C '89 standard so it should be reliable.
After including the missing header compilation fails at line 2217:
jpeg_create_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo)
{
SETJMP(sp->exit_jmpbuf)?
return(0):
{
jpeg_create_decompress(cinfo);
return(1);
}
}
With error:
/home/bfriesen/src/graphics/libtiff/libtiff/tif_ojpeg.c: In function
'jpeg_create_decompress_encap':
/home/bfriesen/src/graphics/libtiff/libtiff/tif_ojpeg.c:2217: error: syntax
error before 'return'
There are many similar errors.
It seems wise to at least test compilation in longjmp mode even if you
can't use the result under Delphi.
Bob