Demand for AVIF support on the web is growing, as the word gets out
about this new file format which allows higher-quality encoding at
smaller sizes. Core contributors to major open-source CMSs are
interested in auto-generating AVIF images! They've been simply
waiting for support to appear in libgd.
This PR aims to meet the growing demand, and to help bring smaller,
more beautiful images to more of the web - to sites created by
experienced developers and CMS users alike.
This PR adds support by incorporating libavif in addition to the
existing libheif support. It's generally felt that libavif has
more complete support for the AVIF format. libavif is also used
by the Chromium project and squoosh.app.
In this PR, I've endeavored to incorporate the latest research into
best practices for AVIF encoding - not just for default quantizer
values, but also an algorithm for determining the number of
horizontal tiles, vertical tiles, and threads.
Fixes#557.
The standard behavior in distros nowadays is to build shared libs and
omit static libs. Split the build knobs in cmake to support this. It
also matches what's available with the autotools build.
Using the addon kills the build immediately if we're throttled, so move
the logic to our main script where we have much better control over it.
This also let's us filter out duplicate builds -- instead of posting all
4 (current) matrix builds, we just post the first one. The coverage is
pretty much the same.
Many of the tests open files in local paths for writing which leaves a
variety of temp files in the tests subdirs. This ends up failing in a
few scenarios like out of tree builds or cmake builds.
Add a few helper functions to the common gdtest module to quickly get
handles to temp files for the tests to leverage.
Pull the script code out into a real bash script so we can do a lot more
easily w/out having to worry about YAML syntax.
While we're here, expand the autotool testing and add some basic cmake
build tests too.
Ben Morss
Mike Frysinger
willson-chen
willson-chen
Christoph M. Becker