openjpeg/src/lib/openjp2/bench_dwt.c, branch master

Fix some typos (found by codespell)

2021-12-05T12:14:33Z

Signed-off-by: Stefan Weil

bench_dwt.c: add a -I switch to test irreversible FWDT/IDWT

2020-05-20T21:20:48Z

Add multithreaded support in the DWT encoder.

2020-05-20T18:30:21Z

Update the bench_dwt utility to have a -decode/-encode switch Measured performance gains for DWT encoder on a Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (4 cores, hyper threaded) Encoding time: $ ./bin/bench_dwt -encode -num_threads 1 time for dwt_encode: total = 8.348 s, wallclock = 8.352 s $ ./bin/bench_dwt -encode -num_threads 2 time for dwt_encode: total = 9.776 s, wallclock = 4.904 s $ ./bin/bench_dwt -encode -num_threads 4 time for dwt_encode: total = 13.188 s, wallclock = 3.310 s $ ./bin/bench_dwt -encode -num_threads 8 time for dwt_encode: total = 30.024 s, wallclock = 4.064 s Scaling is probably limited by memory access patterns causing memory access to be the bottleneck. The slightly worse results with threads==8 than with thread==4 is due to hyperthreading being not appropriate here.

bench_dwt: fix wrong index in iteration (issue found by Fethi Migaou)

2018-02-18T13:38:16Z

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

2017-09-19T10:46:20Z

Sub-tile decoding: only allocate tile component buffer of the needed dimension

2017-09-01T14:30:29Z

Instead of being the full tile size. * Use a sparse array mechanism to store code-blocks and intermediate stages of IDWT. * IDWT, DC level shift and MCT stages are done just on that smaller array. * Improve copy of tile component array to final image, by saving an intermediate buffer. * For full-tile decoding at reduced resolution, only allocate the tile buffer to the reduced size, instead of the full-resolution size.

Subtile decoding: only do 5x3 IDWT computations on relevant areas of tile-component buffer.

2017-08-18T13:08:51Z

This lowers 'bin/opj_decompress -i ../MAPA.jp2 -o out.tif -d 0,0,256,256' down to 0.860s

bench_dwt.c: fix signedness related warnings

2017-08-17T15:04:48Z

Add bench_dwt program (compiled only if BUILD_BENCH_DWT=ON)

2017-06-20T15:56:19Z