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This PR try to add avif speed for imagor.
It's said imagor doesn't support avif speed, while similar image cdns like thumbor and imgproxy do support.
In a test with wrk, imagor is faster than thumbor and imgproxy, and with a smallest Stdev.
Please note, libvips has changed to parameter from
speed
toeffort
in 2021, however,speed
still works.ref 1: https://www.libvips.org/API/current/VipsForeignSave.html#vips-heifsave-buffer
ref 2: https://github.com/libvips/libvips/blob/master/libvips/foreign/heifsave.c
(libvips would convert
effort
tospeed
again forheif
's api. :-)BTW,
heif
support differentspeed
for differentcodec
:aom 0-9, https://github.com/strukturag/libheif/blob/master/libheif/plugins/encoder_aom.cc
rav1e 0-10, https://github.com/strukturag/libheif/blob/master/libheif/plugins/encoder_rav1e.cc
svt 0-13, https://github.com/strukturag/libheif/blob/master/libheif/plugins/encoder_svt.cc