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Hello,
maybe someone else is working on JBIG2 support. If so this information
might be useful to him/her.
1.) The test data for JBIG2 (torture/testdata/TD0000*) is not correct.
With some search I found the source of the TD0000* files: It is the
second page of this document:
(http://www.circuitwizard.de/pdftex/old-jbig2/foo.pdf)
The TD00003 file is claimed as the result of decoding TD00001 and
TD00002, but if you attach the BPM header it shows an empty box.
Acroread and poppler are showing a JBIG2 halftone gradient.
I extracted the decoded bitmap from poppler (with pdfimages) and checked
the halftones against a screenshot from Adobe Reader. It's the same
bitmap.
Attached you find a patch with the correct TD00003 file.
2.) Even if you compile jbig2dec-0.11 for yourself with -DJBIG2_HALFTONE
enabled, the output of jbig2dec is with an empty box (without the
halftones). So the problem about halftones is not caused by the GNU PDF
code. This will cause a permanent failure of the unit test I am going to
create, until jbig2dec is able to handle halftone.
3.) I was confused by torture/testdata/TD0000*.desc that makes
statements about the global segment (singular). Later I found out, that
TD00001 contains 2 global segments. Therefore I changed the description
files to plural. (Of course it is a small thing, but it cost me hours of
debugging.)
Regards,
Georg
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# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: georg.gottleu...@uni-ulm.de-20110831125012-\
# qn4npav5fdwfr2sp
# target_branch: bzr://bzr.sv.gnu.org/pdf/libgnupdf/trunk/
# testament_sha1: c2be6e7e2cc6bb21d576fed178f7e9b396f6c710
# timestamp: 2011-08-31 14:50:39 +0200
# base_revision_id: aleksan...@gnu.org-20110829194024-0zfti9i7y1quev38
#
# Begin patch
=== modified file 'torture/testdata/TD00001.desc'
--- torture/testdata/TD00001.desc 2010-04-20 10:57:53 +0000
+++ torture/testdata/TD00001.desc 2011-08-31 12:50:12 +0000
@@ -1,1 +1,1 @@
-JBIG2 global segment for the page @file{TD00002}.
+JBIG2 global segments for the page @file{TD00002}.
=== modified file 'torture/testdata/TD00002.desc'
--- torture/testdata/TD00002.desc 2010-04-20 10:57:53 +0000
+++ torture/testdata/TD00002.desc 2011-08-31 12:50:12 +0000
@@ -1,1 +1,1 @@
-JBIG2 page using global segment @file{TD00001}.
+JBIG2 page using global segments @file{TD00001}.
=== modified file 'torture/testdata/TD00003'
Binary files torture/testdata/TD00003 2009-08-11 14:06:26 +0000 and
torture/testdata/TD00003 2011-08-31 12:50:12 +0000 differ
=== modified file 'torture/testdata/TD00003.desc'
--- torture/testdata/TD00003.desc 2009-01-10 00:45:53 +0000
+++ torture/testdata/TD00003.desc 2011-08-31 12:50:12 +0000
@@ -1,2 +1,2 @@
Decoded JBIG2 page bitmap from page @file{TD00002} and global
-segment @file{TD00001}.
+segments @file{TD00001}.
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