unifont: Load GNU Unifont font

In hexfont: 'GNU Unifont' Hex Fonts

Load GNU Unifont font

Description

The function unifont() loads in several GNU Unifont hex files as a single bittermelon::bm_font() object.

Usage

unifont(
  upper = TRUE,
  jp = FALSE,
  csur = TRUE,
  sample = FALSE,
  ucp = NULL,
  cache = getOption("unifont.cache", NULL)
)

Arguments

upper	Include glyphs above the Unicode Basic Multilingual plane.
jp	Use Japanese version of Chinese characters.
csur	Include (Under-)Conscript Unicode Registry glyphs.
sample	Add circle to "Combining" characters.
ucp	Character vector of Unicode Code Points: glyphs not in this vector won't be read in. If NULL (default) read every glyph in the font.
cache	If TRUE read a cached version of this font from tools::R_user_dir("hexfont", "cache") if it exists and if it does not exist than create a cached version of this font. If FALSE don't read or write a cached version of this font (even if it exists). If NULL read a cached version of this font if it exists but if it does not exist then don't create it. This argument is ignored if ucp is not NULL.

Value

A bittermelon::bm_font() object. If cache is TRUE then as a side effect may create an .rds file in tools::R_user_dir("hexfont", "cache").

Examples

# Much faster to load only the subset of GNU Unifont one needs
# Mandarin Chinese
if (require("bittermelon")) {
  s <- "\uff32\u5f88\u68d2\uff01"
  font <- unifont(ucp = str2ucp(s))
  bm <- as_bm_bitmap(s, font = font)
  print(bm, px = px_ascii)
}

# Emoji
if (require("bittermelon")) {
  s <- "\U0001f42d\U0001f432\U0001f435"
  font <- unifont(ucp = str2ucp(s))
  bm <- as_bm_bitmap(s, font = font)
  print(bm, px = px_ascii)
}

# Will take more than 5s on CRAN machines
# Compiling the entire font from the hex files takes a long time
system.time(font <- unifont(cache = FALSE))
prettyNum(length(font), big.mark = ",") # number of glyphs
# It is usually much faster to use a cached version of the font
if (file.exists(hexfont:::unifont_cache_filename())) {
  system.time({font_from_cache <- unifont(cache = TRUE)})
}

hexfont documentation built on April 4, 2025, 2:38 a.m.