7eba4ee43f
Introduce support for target_clones attribute ( #3280 )
...
This requires GLIBC 2.23+, plus either gcc 6+ or clang 14+.
- Provides build-time feature detection
- Use with (un)premultiply for ~10% perf gain on AVX CPUs
- Slightly increases binary size, so best to use sparingly
2023-01-16 10:45:37 +01:00
29e80ca43f
better 0 detection in unpremultiply
...
We were avoiding /0 by testing for alpha==0, however, this will still
allow very small values of alpha to generate +/- Inf. Instead, check for
abs(alpha)<epsilon.
Fixes some artifacts after unpremul.
2022-08-08 16:16:10 +01:00
0337c09700
Cleanup gettext handling ( #2695 )
...
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.
2022-02-27 15:27:28 +00:00
0623a05f48
remove vips_recip()
...
it wasn't really necessary, and it was rather slow
2021-03-05 20:19:05 +00:00
0407c365d1
better again
2021-02-27 20:47:29 +00:00
d3ccadf212
revise unpremultiply, again
...
We were not detecting division by zero carefully enough, nor clipping
the alpha range sufficiently in unpremultiply.
see https://github.com/libvips/libvips/issues/1941
also see https://github.com/libvips/libvips/pull/1675 for another
difficult test case
2021-02-27 15:16:25 +00:00
dbae22ab58
revise unpremultiply
...
We were clipping alpha very aggressively. With over- and under-shoot
ringing on edges, this could introduce extra fringes.
see https://github.com/libvips/libvips/pull/1675
2020-06-08 18:47:28 +01:00
712157cd16
better support for TIFFs with many alphas
...
The premultiplied alpha can be in any position, and it checks if there
is more than one ASSOCALPHA.
See https://github.com/libvips/libvips/issues/1471
2019-11-18 16:48:34 +00:00
f472df4444
block /0 in unpremultiply
2019-08-04 14:01:42 +01:00
bb81113312
add credits
2017-11-24 22:12:41 +00:00
7e23a140c4
~10% speedup by matching clipped alpha type with IN/OUT
...
Improves unpremultiply precision for float/double input
2017-11-24 19:20:29 +00:00
5bad0404c2
Update GObject annotations for libvips/conversion directory
2017-09-26 17:04:17 +01:00
362c7efdfc
argh reapply seq removal
2017-03-06 11:55:38 +00:00
e6b20cbd0f
Revert "remove stalling"
...
This reverts commit 959f412380
2017-02-27 10:26:32 +00:00
959f412380
remove stalling
2017-02-21 15:03:15 +00:00
dbbd2850a1
better max_alpha default
...
it used to default to 255, now it sniff the interpretation and defaults to
65535 for RGB16 and GREY16
see https://github.com/jcupitt/libvips/issues/449
2016-05-23 12:18:39 +01:00
1654ac7e5b
fix a comment
2016-05-16 14:32:52 +01:00
1ae92bb15f
make optional args into bullets
...
make docs easier to read
2016-05-02 10:12:37 +01:00
e69da1952d
fix a typo
...
thank you mayoung
see https://github.com/jcupitt/libvips/issues/382
2016-02-11 18:56:55 +00:00
07a1903390
use g_assert_not_reached()
...
we were using g_assert(0) ... g_assert_not_reached() makes the
intention clearer
2016-01-24 13:21:53 +00:00
ec52d1b922
change vips_flatten() alpha rules
...
now match vips_premultiply()
add tests
foreign knows about new logic
2015-05-09 12:10:42 +01:00
9dda68f8cd
final polish
2015-05-09 10:21:31 +01:00
05acd06661
fix up docs
2015-05-09 10:15:11 +01:00
472bf7dbc3
add vips_unpremultiply()
2015-05-08 10:26:23 +01:00
Lovell Fuller
John Cupitt
Kleis Auke Wolthuizen
Lovell Fuller
Alistair Thomas