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119 lines
4.3 KiB
Markdown
119 lines
4.3 KiB
Markdown
% notcurses_capabilities(3)
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% nick black <nickblack@linux.com>
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% v3.0.9
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# NAME
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notcurses_capabilities - runtime capability detection
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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**const char* notcurses_detected_terminal(const struct notcurses* ***nc***);**
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**unsigned notcurses_supported_styles(const struct notcurses* ***nc***);**
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**unsigned notcurses_palette_size(const struct notcurses* ***nc***);**
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**bool notcurses_cantruecolor(const struct notcurses* ***nc***);**
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**bool notcurses_canfade(const struct notcurses* ***nc***);**
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**bool notcurses_canchangecolor(const struct notcurses* ***nc***);**
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**bool notcurses_canopen_images(const struct notcurses* ***nc***);**
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**bool notcurses_canopen_videos(const struct notcurses* ***nc***);**
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**bool notcurses_canutf8(const struct notcurses* ***nc***);**
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**bool notcurses_canhalfblock(const struct notcurses* ***nc***);**
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**bool notcurses_canquadrant(const struct notcurses* ***nc***);**
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**bool notcurses_cansextant(const struct notcurses* ***nc***);**
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**bool notcurses_canbraille(const struct notcurses* ***nc***);**
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**bool notcurses_canpixel(const struct notcurses* ***nc***);**
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```c
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typedef enum {
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NCPIXEL_NONE = 0,
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NCPIXEL_SIXEL, // sixel
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NCPIXEL_LINUXFB, // linux framebuffer
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NCPIXEL_ITERM2, // iTerm2
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NCPIXEL_KITTY_STATIC, // kitty pre-0.20.0
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NCPIXEL_KITTY_ANIMATED, // kitty pre-0.22.0
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NCPIXEL_KITTY_SELFREF, // kitty 0.22.0+, wezterm
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} ncpixelimpl_e;
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```
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**ncpixelimpl_e notcurses_check_pixel_support(struct notcurses* ***nc***);**
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# DESCRIPTION
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**notcurses_detected_terminal** returns a free-form string describing
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the detected terminal. Terminal detection takes into account any
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specified terminal database (see **notcurses_init(3)**), the **TERM**,
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**TERM_PROGRAM**, and **TERM_PROGRAM_VERSION** environment variables,
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the response to a **XTGETTCAP[TN]** Device Control String, the response
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to Primary, Secondary, and Tertiary Send Device Attributes control
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sequences, and the phase of the moon. You should not build logic around
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this response; all relevant properties of the terminal ought be
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abstracted by Notcurses. This is only made available for diagnostics.
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**notcurses_supported_styles** returns a bitmask representing those styles
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for which the terminal advertises support.
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**notcurses_palette_size** returns the size of the terminal's palette, used
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for palette-indexed color. It will always return at least 1. This is
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independent of RGB TrueColor support. No terminal is know to support
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more than 256-indexed color.
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**notcurses_cantruecolor** returns **true** if the terminal advertises
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support for RGB TrueColor. Note that the RGB APIs of Notcurses can be used
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even in the absence of terminal RGB support (Notcurses will map the RGB
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values to the palette).
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**notcurses_canfade** returns **true** if Notcurses has a means by which
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it can effect fades.
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**notcurses_canchangecolor** returns **true** if the terminal advertises
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support for changing its palette entries.
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**notcurses_canopen_images** returns **true** if Notcurses was built with
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multimedia support.
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**notcurses_canopen_video** returns **true** if Notcurses was built with
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multimedia support capable of decoding videos.
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**notcurses_canutf8** returns **true** if the configured locale uses
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UTF-8 encoding, and the locale was successfully loaded.
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**notcurses_cansextant** returns **true** if the heuristics suggest
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that the terminal can properly render Unicode 13 sextants. Likewise,
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**notcurses_canquadrant** and **notcurses_canhalfblock** return **true**
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if the heuristics suggest that the terminal can properly render Unicode
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quadrants and halfblocks, respectively. **notcurses_canbraille** returns
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**true** if Unicode Braille is expected to work on the terminal. None of
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these functions return **true** unless UTF-8 encoding is in use.
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**notcurses_check_pixel_support** returns a non-zero pixel implementation
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if bitmap support (via any mechanism) has been detected, and otherwise 0
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(**NCPIXEL_NONE**). **notcurses_canpixel** folds this down to a boolean.
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# NOTES
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Some terminals advertise support for TrueColor, but then downsample or
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otherwise degrade the provided RGB. In this case **notcurses_cantruecolor**
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will return **true**, but the full spectrum will not be available.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_init(3)**,
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**notcurses_visual(3)**,
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utf8(7)
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