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config: tweak.surface-bit-depth: add support for 16-bit surfaces

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This adds supports for 16-bit surfaces, using the new
PIXMAN_a16b16g16r16 buffer format. This maps to
WL_SHM_FORMAT_ABGR16161616 (little-endian).

Use the new 16-bit surfaces by default, when
gamma-correct-blending=yes.
This commit is contained in:
Daniel Eklöf 2025-05-01 09:37:47 +02:00
parent 7354b94f73
commit 970e13db8d
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GPG key ID: 5BBD4992C116573F
10 changed files with 101 additions and 25 deletions
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29
doc/foot.ini.5.scd
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@ -207,7 +207,7 @@ empty string to be set, but it must be quoted: *KEY=""*)
Compared to the default (disabled), bright glyphs on a dark
background will appear thicker, and dark glyphs on a light
background will appear thinner.
FreeType can limit the effect of the latter, with a technique
called stem darkening. It is only available for CFF fonts
(OpenType, .otf) and disabled by default (in FreeType). You can
@ -221,12 +221,13 @@ empty string to be set, but it must be quoted: *KEY=""*)
font designer set the font weight based on incorrect rendering.
In order to represent colors faithfully, higher precision image
buffers are required. By default, foot will use 10-bit color
channels, if available, when gamma-correct blending is
enabled. However, the high precision buffers are slow; if you want
to use gamma-correct blending, but prefer speed (throughput and
input latency) over accurate colors, you can force 8-bit color
channels by setting *tweak.surface-bit-depth=8-bit*.
buffers are required. By default, foot will use either 16-bit, or
10-bit color channels, depending on availability, when
gamma-correct blending is enabled. However, the high precision
buffers are slow; if you want to use gamma-correct blending, but
prefer speed (throughput and input latency) over accurate colors,
you can force 8-bit color channels by setting
*tweak.surface-bit-depth=8-bit*.
Default: _no_.
@ -2023,7 +2024,7 @@ any of these options.
*surface-bit-depth*
Selects which RGB bit depth to use for image buffers. One of
*auto*, *8-bit*, or *10-bit*.
*auto*, *8-bit*, *10-bit* or *16-bit*.
*auto* chooses bit depth depending on other settings, and
availability.
@ -2033,12 +2034,14 @@ any of these options.
*10-bit* uses 10 bits for each RGB channel, and 2 bits for the
alpha channel. Thus, it provides higher precision color channels,
but a lower precision alpha channel. It is the default when
*gamma-correct-blending=yes*, if supported by the compositor.
but a lower precision alpha channel.
Note that *10-bit* is much slower than *8-bit*; if you want to use
gamma-correct blending, and if you prefer speed (throughput and
input latency) over accurate colors, you can set
*16-bit* 16 bits for each color channel, alpha included. If
available, this is the default when *gamma-correct-blending=yes*.
Note that both *10-bit* and *16-bit* are much slower than *8-bit*;
if you want to use gamma-correct blending, and if you prefer speed
(throughput and input latency) over accurate colors, you can set
*surface-bit-depth=8-bit* explicitly.
Default: _auto_