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color: reword set_tf_gamma

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Improve the definition and do not talk about gamma. Gamma is still in
the name, but maybe that's fine.

Change the encoding to support three decimals, I think that's well
enough.

Set some limits on the exponent so that compositor implementations do
not get into trouble with nonsense values.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2022-12-13 15:10:32 +02:00 • committed by Sebastian Wick
parent bbf09b8fe3
commit 997ec3e829
1 changed files with 10 additions and 4 deletions
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14
staging/color-management/color-management-v1.xml
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@ -509,13 +509,19 @@
</request>
<request name="set_tf_gamma">
<description summary="Set the Gamma curve">
Sets the transfer characteristics as a gamma curve.
<description summary="transfer characteristic as a power curve">
Sets the transfer characteristic to a power curve with the given
exponent. This curve represents the conversion from electrical to
optical pixel or color values.
Use decimal value to define the gamma (e.g. 22 for a 2.2 Gamma, 24 for a 2.4 Gamma, etc)
The curve exponent shall be multiplied by 10000 to get the argument
eexp value to carry precision of 4 decimals.
The curve exponent must be at least 1.0 and at most 10.0. Otherwise
the protocol error invalid_tf is raised.
</description>
<arg name="gamma" type="uint" summary="The gamma type (2.2, 2.4 etc)"/>
<arg name="eexp" type="uint" summary="the exponent * 10000"/>
</request>
<request name="set_primaries_cicp">