Single-threaded performance improvements in forward DWT for 5-3 and 9-7 (and other improvements)#1253

Merged

rouault merged 24 commits intouclouvain:masterfrom rouault:floating_point_irreversible_encoding

Oct 9, 2020

+3,100-2,014

Commits on May 20, 2020

Add multithreading support in the T1 (entropy phase) encoder
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Add multithreaded support in the DWT encoder.
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dwt.c: change sign of constants to match standard and compensate (no functional change)
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Encoder: use floating-point operations for irreversible transformation
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tcd.c: add comment
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compare_images.c: code reformatting
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Testing: revise testing of lossy encoding by comparing PEAK and MSE with original image
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opj_mct_encode_real(): add SSE optimization
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opj_j2k_setup_encoder(): add validation of tile width and height to avoid potential division by zero
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opj_dwt_encode_1_real(): avoid many bound comparisons, similarly to decoding side
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Irreversible decoding: align code more closely to the standard by avoid messing up with stepsize (no functional change)
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Irreversible compression/decompression DWT: use 1/K constant as per standard
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Irreversible decoding: partially revert previous commit, to fix failures in test suite
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bench_dwt.c: add a -I switch to test irreversible FWDT/IDWT
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Commits on May 21, 2020

Commits on May 24, 2020

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