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55 lines
1.6 KiB
Markdown
55 lines
1.6 KiB
Markdown
% notcurses_palette(3)
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% nick black <nickblack@linux.com>
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% v1.2.1
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# NAME
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notcurses_palette - operations on notcurses palettes
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# SYNOPSIS
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**#include <notcurses.h>**
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```c
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typedef struct palette256 {
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// We store the RGB values as a regular ol' channel
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uint32_t chans[256];
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} palette256;
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```
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**palette256* palette256_new(struct notcurses* nc);**
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**int palette256_use(struct notcurses* nc, const palette256* p);**
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**int palette256_set_rgb(palette256* p, int idx, int r, int g, int b);**
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**int palette256_set(palette256* p, int idx, unsigned rgb);**
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**int palette256_get_rgb(const palette256* p, int idx, int* restrict r, int* restrict g, int* restrict b);**
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**void palette256_free(palette256* p);**
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**bool notcurses_canchangecolors(const struct notcurses* nc);**
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# DESCRIPTION
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Some terminals only support 256 colors, but allow the full palette to be
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specified with arbitrary RGB colors. In all cases, it's more performant to use
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indexed colors, since it's much less data to write to the terminal. If you can
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limit yourself to 256 colors, that's probably for the best.
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In addition, palette-based color allows for very fast color cycling effects,
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since a single command can affect many cells on the screen.
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# RETURN VALUES
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Functions returning `int` return -1 on failure, or 0 on success. Failure is
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always due to invalid inputs. Functions returning `bool` are predicates, and
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return the requested value. Functions returning `unsigned` forms return the
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input, modified as requested.
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# SEE ALSO
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**notcurses(3)**, **notcurses_cell(3)**, **notcurses_channels(3)**,
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**notcurses_ncplane(3)**, **notcurses_output(3)**
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