Re: TIFF compression support list

Am 28.09.23 um 18:02 schrieb Bob Friesenhahn:

> Oops!  Try using '#undef LZW_SUPPORT' instead.
> 
> There are many other FOO_SUPPORT options and if you want to prevent 
> some of those codecs, you might want to undefine those as well.

Hm, either I did something stupid or that doesn't work.  With the
attached patch, the build indicates LZW support, and I am able to create
an LZW compressed image.  At least tiffdump shows a compression tag 5
and file size is between RLE and Zip compression.

What is the expected result of requesting a non-existent compression type?

Best,
fux

$ hg diff coders/tiff.c
diff -r d97320e45918 coders/tiff.c
--- a/coders/tiff.c     Sat Sep 23 16:13:36 2023 -0500
+++ b/coders/tiff.c     Thu Sep 28 18:24:01 2023 +0200
@@ -63,6 +63,7 @@
 #  endif
 #  include "tiff.h"
 #  include "tiffio.h"
+#  undef LZW_SUPPORT
 #  if !defined(COMPRESSION_ADOBE_DEFLATE)
 #     define COMPRESSION_ADOBE_DEFLATE  8
 #  endif  /* !defined(COMPRESSION_ADOBE_DEFLATE) */