add note about libheif config to README

see eg. https://github.com/libvips/libvips/issues/1964
This commit is contained in:
John Cupitt 2021-01-16 18:56:14 +00:00
parent 9f20aa37ea
commit 179e9d1a11
1 changed files with 17 additions and 2 deletions

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@ -212,7 +212,7 @@ If libvips finds this library, it uses it for fourier transforms.
### lcms2
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
are available for transforming images with ICC profiles.
can be used to manipulate images with ICC profiles.
### libspng
@ -279,7 +279,22 @@ files: Aperio, Hamamatsu, Leica, MIRAX, Sakura, Trestle, and Ventana.
### libheif
If available, libvips can load and save HEIC and AVIF images.
If available, libvips can load and save HEIC and AVIF images. Your libheif (in
turn) needs to be built with the correct decoders and encoders. You can check
with eg.:
```
$ pkg-config libheif --print-variables
builtin_avif_decoder
builtin_avif_encoder
builtin_h265_decoder
builtin_h265_encoder
exec_prefix
includedir
libdir
pcfiledir
prefix
```
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