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render: dim and brighten using linear rgb interpolation

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Adds setting tweak.dim-amount, similar to bold-text-in-bright-amount.

Closes #2006
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Sam McCall 2025-03-22 20:11:23 +01:00 • committed by Daniel Eklöf
parent 5f72f51ae8
commit 663c9082db
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7 changed files with 51 additions and 66 deletions
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doc/foot.ini.5.scd
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@ -396,7 +396,7 @@ empty string to be set, but it must be quoted: *KEY=""*)
*bold-text-in-bright*
Semi-boolean. When enabled, bold text is rendered in a brighter
color (in addition to using a bold font). The color is brightened
by increasing its luminance.
by blending it with white.
If set to *palette-based*, rather than a simple *yes|true*, colors
matching one of the 8 regular palette colors will be brightened
@ -986,8 +986,8 @@ can configure the background transparency with the _alpha_ option.
an entry in the color palette. Applications emit them by combining
a color value, and a "dim" attribute.
By default, foot implements this by reducing the luminance of the
current color. This is a generic approach that applies to both
By default, foot implements this by blending the current color
with black. This is a generic approach that applies to both
colors from the 256-color palette, as well as 24-bit RGB colors.
You can change this behavior by setting the *dimN* options. When
@ -999,7 +999,7 @@ can configure the background transparency with the _alpha_ option.
the corresponding *regularN* color will be used.
If the current color does not match any known color, it is dimmed
by reducing the luminance (i.e. the same behavior as if the *dimN*
by blending with black (i.e. the same behavior as if the *dimN*
options are unconfigured). 24-bit RGB colors will typically fall
into this category.
@ -1940,6 +1940,9 @@ any of these options.
Boolean. When enabled, foot will process sixel images. Default:
_yes_
*dim-amount*
Amount by which dimmed text is darkened. Default: _1.5_.
*bold-text-in-bright-amount*
Amount by which bold fonts are brightened when
*bold-text-in-bright* is set to *yes* (the *palette-based* variant