* heifsave: make it possible to use a specific encoder
* argument label: switch to leading capital letter
Co-authored-by: Kleis Auke Wolthuizen <github@kleisauke.nl>
* add VipsForeignHeifEncoder enum
* correct type
* implement reviewer feedback
Co-authored-by: Kleis Auke Wolthuizen <github@kleisauke.nl>
Use the bitwise OR assignment operator to ensure that derived
classes does not overwrite the flags from the base class. Also,
move the flags from `openslideload_source` to its base class.
since finish did not return an error code
also make sure we don't call target_end from inside _dispose, since that
can't signal error either
see https://github.com/libvips/libvips/issues/2801
Use GLib's i18n support instead of copying and pasting that
logic into its own header. This deprecates the vips/intl.h
header in favour of glib/gi18n.h.
tell buffer and target savers the file format
Currently, buffer and target savers are not told the format they should
write.
This is usually OK (the JPEG saver already knows it should write JPEG),
but some savers can write several formats, and these currently need an
extra parameter.
For example:
```ruby
buf = x.write_to_buffer ".bmp", format: "bmp"
```
The first ".bmp" gets libvips to pick magicksave, the second
`format:` param is necessary to tell magicksave to write BMP.
This patch adds stub subclasses so that the savers know the exact format. It also improves PPM save.
By default, a dynamically loadable module is built for libheif (i.e.
`--with-heif=module`) when:
* libheif is found;
* GModule is supported (`gmodule_supported` pkg-config variable).
This can be overridden on the command line with:
* `--without-heif` - to disable libheif usage;
* `--with-heif[=yes]` - to restore the previous behavior;
* `--disable-modules` - to disable the build of dynamic modules.
Defaults to no subsampling when Q>90 for consistency with jpegsave.
Deprecate VipsForeignJpegSubsample enum, replace with more generic
VipsForeignSubsample.
Supports both aom and rav1e encoders by limiting to a 0-8 range.
(The rav1e encoder accepts speed values of 9 and 10 but these
use 64x64 blocks more suited to video than images.)
During write, we often call vips__exif_update(). This updates the exif
block from the other image metadata prior to save.
Always copy the image before calling this.
See https://github.com/lovell/sharp/issues/1986
John Cupitt
Daniel Löbl
Kleis Auke Wolthuizen
Lovell Fuller
Philipp Trulson
Lovell Fuller