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

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This adds supports for 16F surfaces (i.e. 16-bit floating point). We
haven't been able to support this until now, since there were no
corresponding pixman image type. Now there is.

Use the new 16f surfaces by default, when gamma-correct-blending=yes.
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Daniel Eklöf 2025-05-01 09:37:47 +02:00
parent 7354b94f73
commit 8faea42d9e
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9 changed files with 88 additions and 25 deletions
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30
doc/foot.ini.5.scd
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@ -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 *16f-bit*.
*auto* chooses bit depth depending on other settings, and
availability.
@ -2033,13 +2034,16 @@ 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
*surface-bit-depth=8-bit* explicitly.
*16f-bit* uses 16 bits (floating point) for each color channel,
alpha included. If available, this is the default when
*gamma-correct-blending=yes*.
Note that both *10-bit* and *16f-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_