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Ben Morss f2aa2836ed
AVIF support (#671) 
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.
 		2021-03-03 21:35:56 -05:00
..
Makefile AVIF support (#671) 2021-03-03 21:35:56 -05:00
README.MSYS.md Update msys readme 2019-10-09 23:49:20 -07:00
deps.mk Added another Makefile. 2013-11-11 16:38:58 -05:00
run_tests.sh a few more shellcheck fixes 2021-02-08 18:18:27 -05:00

README.MSYS.md

MSYS Fallback Makefile

This is a simple, straightforward Makefile for building LibGD with MinGW on MSYS (or possibly Cygwin). It is here for anyone who doesn't want to deal with autotools or CMake on Windows or who can't get either of them working on their particular setup.

Note that this Makefile only builds the library and test cases; the standalone utilities are ignored. If you need those, you'll need to use one of the other build systems (or add them yourself.)

To build LibGD:

  1. Install MinGW and MSYS (see http://www.mingw.org/wiki/Getting_Started). You will need to install zip and unzip as well as the 32-bit C compiler and related tools.

  2. Install LibJpeg, LibPng, LibTiff, Zlib and FreeType from http://gnuwin32.sourceforge.net and install them all in c:/tools/GnuWin32/. (You can get these libraries from other places and/or install them in different locations, but you'll need to edit the Makefile accordingly if you do.)

  3. Skip ahead to the next step. If that doesn't work, edit the Makefile to fix what went wrong. Things to try include:

    • Ensure SRC contains an up-to-date list of source files. (Take a look at libgd_la_SOURCES src/Makefile.am for a reference.)
    • Ensure that the paths and #defines for unsupported libraries are commented out. They're nicely grouped into clusters to simplify that.

  4. cd to this directory and type:

    make
make check

    If both commands succeed, you're done. (Note that some of the testcases will fail, just because they test features not enabled here. This is fine. As long as most tests pass, you're probably okay.)

  5. Type

    make dist

    This will create libgd-win.zip, a zip file containing the new library and its dependants. Note that this step may pick up extra DLLs; it sweeps up all of the DLLs in the directories pointed to by *_DLLDIR Makefile variables.

    Before type "make dist", please make sure you have installed zip command in msys. Or you can try:

    • If you use msys, you can install msys-zip(lib, docs, lic) in MinGW Installation Manager/all package.

    • If you use msys2, you can install msys/zip by pacman and running:

      pacman -S msys/zip

    Alternately, you can copy the lib (in src/) to wherever it needs to go.

Stuff that Doesn't Work

  • LibXpm: It's probably nothing serious, just more trouble than it's worth.
  • LibFontconfig: I couldn't find Windows binaries for it anywhere reputable.