openjpeg/src/lib/openjp2/t1.c, branch floating_point_irreversible_encoding

T1 encoder: speed-up by aggressive inlining and more cache friendly data organization

2020-05-24T13:38:48Z

~ 9% speed improvement seen on 10980x10980 uint16 image, T36JTT_20160914T074612_B02.tif opj_compress time from 17.2s to 15.8s

Irreversible compression/decompression DWT: use 1/K constant as per standard

2020-05-20T18:31:28Z

The previous constant opj_c13318 was mysteriously equal to 2/K , and in the DWT, we had to divide K and opj_c13318 by 2... The issue was that the band->stepsize computation in tcd.c didn't take into account the log2gain of the band. The effect of this change is expected to be mostly equivalent to the previous situation, except some difference in rounding. But it leads to a dramatic reduction of the mean square error and peak error in the irreversible encoding of issue141.tif !

Irreversible decoding: align code more closely to the standard by avoid messing up with stepsize (no functional change)

2020-05-20T18:31:28Z

Encoder: use floating-point operations for irreversible transformation

2020-05-20T18:31:28Z

Add multithreading support in the T1 (entropy phase) encoder

2020-05-20T18:30:21Z

- API wise, opj_codec_set_threads() can be used on the encoding side - opj_compress has a -threads switch similar to opj_uncompress

opj_t1_encode_cblks: fix UBSAN signed integer overflow

2019-03-29T10:17:39Z

Fixes #1053 / CVE-2018-5727 Note: I don't consider this issue to be a security vulnerability, in practice. At least with gcc or clang compilers on x86_64 which generate the same assembly code with or without that fix.

Fix some potential overflow issues (#1161)

2018-10-31T19:44:30Z

* Fix some potential overflow issues Put sizeof to the beginning of the multiplication to enforce that size_t instead of smaller integer types is used for the calculation. This fixes warnings from LGTM: Multiplication result may overflow 'unsigned int' before it is converted to 'unsigned long'. It also allows removing some type casts. Signed-off-by: Stefan Weil * Fix code indentation Signed-off-by: Stefan Weil

Workaround Coverity CID 169392

2017-09-21T12:10:49Z

Avoid relying on operator precedence (raised by cppcheck)

2017-09-19T16:35:52Z

Fix warnings and errors when compiling with a c++ compiler (#1021)

2017-09-19T10:46:20Z