% notcurses_capabilities(3)
% nick black <nickblack@linux.com>
% v3.0.0

# NAME

notcurses_capabilities - runtime capability detection

# SYNOPSIS

**#include <notcurses/notcurses.h>**

**const char* notcurses_detected_terminal(const struct notcurses* ***nc***);**

**unsigned notcurses_supported_styles(const struct notcurses* ***nc***);**

**unsigned notcurses_palette_size(const struct notcurses* ***nc***);**

**bool notcurses_cantruecolor(const struct notcurses* ***nc***);**

**bool notcurses_canfade(const struct notcurses* ***nc***);**

**bool notcurses_canchangecolor(const struct notcurses* ***nc***);**

**bool notcurses_canopen_images(const struct notcurses* ***nc***);**

**bool notcurses_canopen_videos(const struct notcurses* ***nc***);**

**bool notcurses_canutf8(const struct notcurses* ***nc***);**

**bool notcurses_canhalfblock(const struct notcurses* ***nc***);**

**bool notcurses_canquadrant(const struct notcurses* ***nc***);**

**bool notcurses_cansextant(const struct notcurses* ***nc***);**

**bool notcurses_canbraille(const struct notcurses* ***nc***);**

**bool notcurses_canpixel(const struct notcurses* ***nc***);**

```c
typedef enum {
  NCPIXEL_NONE = 0,
  NCPIXEL_SIXEL,           // sixel
  NCPIXEL_LINUXFB,         // linux framebuffer
  NCPIXEL_ITERM2,          // iTerm2
  NCPIXEL_KITTY_STATIC,    // kitty pre-0.20.0
  NCPIXEL_KITTY_ANIMATED,  // kitty pre-0.22.0
  NCPIXEL_KITTY_SELFREF,   // kitty 0.22.0+, wezterm
} ncpixelimpl_e;
```

**ncpixelimpl_e notcurses_check_pixel_support(struct notcurses* ***nc***);**

# DESCRIPTION

**notcurses_detected_terminal** returns a free-form string describing
the detected terminal. Terminal detection takes into account any
specified terminal database (see **notcurses_init(3)**), the **TERM**,
**TERM_PROGRAM**, and **TERM_PROGRAM_VERSION** environment variables,
the response to a **XTGETTCAP[TN]** Device Control String, the response
to Primary, Secondary, and Tertiary Send Device Attributes control
sequences, and the phase of the moon. You should not build logic around
this response; all relevant properties of the terminal ought be
abstracted by Notcurses. This is only made available for diagnostics.

**notcurses_supported_styles** returns a bitmask representing those styles
for which the terminal advertises support.

**notcurses_palette_size** returns the size of the terminal's palette, used
for palette-indexed color. It will always return at least 1. This is
independent of RGB TrueColor support. No terminal is know to support
more than 256-indexed color.

**notcurses_cantruecolor** returns **true** if the terminal advertises
support for RGB TrueColor. Note that the RGB APIs of Notcurses can be used
even in the absence of terminal RGB support (Notcurses will map the RGB
values to the palette).

**notcurses_canfade** returns **true** if Notcurses has a means by which
it can effect fades.

**notcurses_canchangecolor** returns **true** if the terminal advertises
support for changing its palette entries.

**notcurses_canopen_images** returns **true** if Notcurses was built with
multimedia support.

**notcurses_canopen_video** returns **true** if Notcurses was built with
multimedia support capable of decoding videos.

**notcurses_canutf8** returns **true** if the configured locale uses
UTF-8 encoding, and the locale was successfully loaded.

**notcurses_cansextant** returns **true** if the heuristics suggest
that the terminal can properly render Unicode 13 sextants. Likewise,
**notcurses_canquadrant** and **notcurses_canhalfblock** return **true**
if the heuristics suggest that the terminal can properly render Unicode
quadrants and halfblocks, respectively. **notcurses_canbraille** returns
**true** if Unicode Braille is expected to work on the terminal. None of
these functions return **true** unless UTF-8 encoding is in use.

**notcurses_check_pixel_support** returns a non-zero pixel implementation
if bitmap support (via any mechanism) has been detected, and otherwise 0
(**NCPIXEL_NONE**). **notcurses_canpixel** folds this down to a boolean.

# NOTES

Some terminals advertise support for TrueColor, but then downsample or
otherwise degrade the provided RGB. In this case **notcurses_cantruecolor**
will return **true**, but the full spectrum will not be available.

# SEE ALSO

**notcurses(3)**,
**notcurses_init(3)**,
**notcurses_visual(3)**,
utf8(7)