A display attribute defines the Color and Style of all the characters rendered after the
attribute is applied.
At most 256 colors, picked from a 240 and 16 color palette, are possible for the background and
foreground. The 240 colors and 16 colors are points in different palettes. See Color for more
|Specifies the display attributes such that the final style and color values do not depend on
the previously applied display attribute. The display attributes can still depend on the
terminal's default colors (unfortunately).
|The style and color attributes can either be the terminal defaults. Or be equivalent to the
previously applied style. Or be a specific value.
Abstract data type representing a color.
Currently the foreground and background color are specified as points in either a:
- 16 color palette. Where the first 8 colors are equal to the 8 colors of the ISO 6429 (ANSI) 8
color palette and the second 8 colors are bright/vivid versions of the first 8 colors.
- 240 color palette. This palette is a regular sampling of the full RGB colorspace.
The 8 ISO 6429 (ANSI) colors are as follows:
The mapping from points in the 240 color palette to colors actually displayable by the terminal
depends on the number of colors the terminal claims to support. Which is usually determined by
the terminfo colors property. If this property is not being accurately reported then the color
reproduction will be incorrect.
If the terminal reports <= 16 colors then the 240 color palette points are only mapped to the 8
color pallete. I'm not sure of the RGB points for the bright colors which is why they are not
addressable via the 240 color palette.
If the terminal reports > 16 colors then the 240 color palette points are mapped to the nearest
points in a (color count - 16) subsampling of the 240 color palette.
All of this assumes the terminals are behaving similarly to xterm and rxvt when handling colors.
And that the individual colors have not been remapped by the user. There may be a way to verify
this through terminfo but I don't know it.
Seriously, terminal color support is INSANE.
|Standard 8-color ANSI terminal color codes.
|Bright/Vivid variants of the standard 8-color ANSI
|Styles are represented as an 8 bit word. Each bit in the word is 1 if the style attribute
assigned to that bit should be applied and 0 if the style attribute should not be applied.
The 6 possible style attributes:
( The invisible, protect, and altcharset display attributes some terminals support are not
supported via VTY.)
|true if the given Style value has the specified Style set.
|Set the foreground color of an Attr.
|Set the background color of an Attr.
|Add the given style attribute
|Sets the style, background color and foreground color to the default values for the terminal.
There is no easy way to determine what the default background and foreground colors are.
Keeps the style, background color and foreground color that was previously set. Used to
override some part of the previous style.
EG: current_style with_fore_color bright_magenta
Would be the currently applied style (be it underline, bold, etc) but with the foreground color
set to bright_magenta.
|Produced by Haddock version 2.4.2|