tree e81eac9e31889a7c987c735d5e08ca2cca04be67
parent 170a8104867fa818d329d85921012c922577c955
author Nigel Tao <nigeltao@golang.org> 1611278955 +1100
committer Nigel Tao <nigeltao@golang.org> 1611281742 +1100

Be able to test and bench the libspng library

That's libspng with an 's', instead of libpng without an 's'.

Wuffs' std/png and std/zlib implementations have not been fully
optimized yet, but as a snapshot, here's how it compares with these
"mimic" libraries, libspng and libpng.

On a mid-range x86_64 laptop:

Wuffs/clang9:
wuffs_png_decode_image_19k_8bpp/clang9                    91.9MB/s ± 0%
wuffs_png_decode_image_40k_24bpp/clang9                    128MB/s ± 0%
wuffs_png_decode_image_77k_8bpp/clang9                     342MB/s ± 0%
wuffs_png_decode_image_552k_32bpp_ignore_checksum/clang9   324MB/s ± 0%
wuffs_png_decode_image_552k_32bpp_verify_checksum/clang9   258MB/s ± 0%
wuffs_png_decode_image_4002k_24bpp/clang9                  127MB/s ± 0%

Wuffs/gcc10:
wuffs_png_decode_image_19k_8bpp/gcc10                     94.3MB/s ± 0%
wuffs_png_decode_image_40k_24bpp/gcc10                     131MB/s ± 0%
wuffs_png_decode_image_77k_8bpp/gcc10                      348MB/s ± 1%
wuffs_png_decode_image_552k_32bpp_ignore_checksum/gcc10    319MB/s ± 0%
wuffs_png_decode_image_552k_32bpp_verify_checksum/gcc10    269MB/s ± 0%
wuffs_png_decode_image_4002k_24bpp/gcc10                   131MB/s ± 0%

libspng/clang9:
mimic_png_decode_image_19k_8bpp/clang9                    59.3MB/s ± 1%
mimic_png_decode_image_40k_24bpp/clang9                   78.4MB/s ± 0%
mimic_png_decode_image_77k_8bpp/clang9                     189MB/s ± 0%
mimic_png_decode_image_552k_32bpp_ignore_checksum/clang9   235MB/s ± 0%
mimic_png_decode_image_552k_32bpp_verify_checksum/clang9   203MB/s ± 0%
mimic_png_decode_image_4002k_24bpp/clang9                  110MB/s ± 0%

libspng/gcc10:
mimic_png_decode_image_19k_8bpp/gcc10                     59.5MB/s ± 0%
mimic_png_decode_image_40k_24bpp/gcc10                    77.6MB/s ± 0%
mimic_png_decode_image_77k_8bpp/gcc10                      188MB/s ± 0%
mimic_png_decode_image_552k_32bpp_ignore_checksum/gcc10    223MB/s ± 0%
mimic_png_decode_image_552k_32bpp_verify_checksum/gcc10    193MB/s ± 0%
mimic_png_decode_image_4002k_24bpp/gcc10                   109MB/s ± 0%

libpng (Debian_Testing_Bullseye /usr/lib/x86_64-linux-gnu/libpng.so):
mimic_png_decode_image_19k_8bpp                           58.3MB/s ± 0%
mimic_png_decode_image_40k_24bpp                          73.1MB/s ± 0%
mimic_png_decode_image_77k_8bpp                            177MB/s ± 0%
mimic_png_decode_image_552k_32bpp_ignore_checksum               skipped
mimic_png_decode_image_552k_32bpp_verify_checksum          146MB/s ± 0%
mimic_png_decode_image_4002k_24bpp                         104MB/s ± 0%