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# Font API
This document describes Font API. Font API creates textures for font display on entities.
## Settings
### default_font
Name of the font to be used when no font is given. The font should be registered.
If no default\_font given or if default\_font given but not registered, the first registered font will be used as default.
## Use font_api with display_api (to display text on nodes)
### Base setup
Font_api offers a direct integration with display_api to display text on nodes.
First of all, create a display node with an entity.
To do this, refer to API.md in display_api mod, in particular "Howto register a display node".
The only requirement then is to connect the `on_display_update` callback of the display entity to `font_api.on_display_update`:
```
minetest.register_node("mymod:test_text_node", {
...
paramtype2 = "facedir",
...
groups = { display_api = 1, ... },
...
display_entities = {
["mymod:text"] = {
depth = -0.5 - display_api.entity_spacing,
on_display_update = font_api.on_display_update },
}
...
on_place = display_api.on_place,
on_construct = display_api.on_construct,
on_destruct = display_api.on_destruct,
on_rotate = display_api.on_rotate,
...
})
```
At this step, your node already displays text form "display_text" (by default) node meta. If you want to store your text into another meta data field, add a `meta_text` field to display entity definition.
But it uses defaults (default font, default size, default color). Likely you need something more.
### Style your text
Font style and size can be chosen by adding some more entries to the display_entities definition table.
#### Font size
Font size can be defined in various ways (maybe more in the future).
Start with a number of lines, and font_api will make it fit to the entity size.
* `maxlines` or `lines`: Number of maximum lines of text to be displayed. The font height will be adjusted accordingly.
Then specify the char width. Two methods available:
* `aspect_ratio`: Defines the aspect ratio of chars. Works with all fonts. Should not be used if `columns` is specified.
* `columns`: Only if using a fixed width font, specifies the number of columns to display.
#### Font style
* `font_name`: name of the font to use. Should correspond to a registered font (from a font mod). If not specified or font not found, default font is used.
* `color`: color to be used (default black).
* `halign`: Horizontal alignment: "left", "center" or "right" (default "center").
* `valign`: Vertical alignement: "top", "middle" or "bottom" (default "middle").
### Example
Using blue //botic// font, three lines height, aligned top left. Text stored in "text" node meta.
```
minetest.register_node("mymod:test_text_node", {
...
...
display_entities = {
["mymod:text"] = {
depth = -0.5 - display_api.entity_spacing,
on_display_update = font_api.on_display_update
meta_text = "text",
font_name = "botic",
color = "#0000FF",
maxlines = 3,
aspect_ratio = 0.5,
halign = "left",
valign = "top",
},
}
...
})
```
## Provided methods
### font_api.get_default_font_name()
Returns de default font name.
### font_api.register_font(font_name, font_def)
Register a new font.
* `font_name`: Name of the font to register. If registering different sizes of the same font, add size in the font name (e.g. times_10, times_12...).
* `font_def`: Font definition table (see **Font definition table** below).
### font_api.on_display_update(pos, objref)
Standard on_display_update entity callback.
* `pos`: Node position
* `objref`: Object reference of entity
Node should have a corresponding display_entity with size, resolution and maxlines fields and optionally halign, valign and color fields.
## Font definition table
Font definition table used by **font_api.register_font** and **font\_api.Font:new** may/can contain following elements:
* `height` (required): Font height in pixels (all font textures should have the same height) .
* `widths` (required): Array of character widths in pixels, indexed by UTF codepoints.
* `margintop` (optional): Margin (in texture pixels) added on top of each char texture.
* `marginbottom` (optional): Margin (in texture pixels) added at bottom of each char texture.
* `linespacing` (optional): Spacing (in texture pixels) between each lines.
`margintop`, `marginbottom` and `linespacing` can be negative numbers (default 0) and are to be used to adjust various font styles to each other.
Font attributes around a single char:\
![Font attributes on a char](doc/font.svg)
Font attributes effects on several lines:\
![Font attributes on lines](doc/lines.svg)
#### Additional requirements
Font must have a char 0 which will be used to display any unknown char.
All textures corresponding to the indexes in widths array should be present in textures directory with a name matching the pattern :
> font\_**{font_name}**_**{utf_code}**.png
**{font\_name}**: Name of the font as given in the first argument
**{utf\_code}**: UTF code of the char in 4 hexadecimal digits
Example : font_courrier_0041.png is for the "A" char in the "courrier" font.
To ease that declaration (specially to build the **widths** array), a shell is provided to build a {font\_name}.lua file from the texture files (see provided tools).
## Provided tools
Still in early stage of development, these tools are helpers to create font mods.
### make_font_texture.sh
This scripts takes a .ttf file as input and create one .png file per char, that can be used as font texture. Launch it from your future font mod directory.
__Advice__
This script works much better with pixels font, providing the correct height. There is no antialiasing at all, vector fonts and bad heights gives very ugly results.
__Syntax__
**make\_font\_texture.sh {fontfile} {fontname} {fontsize}**
**{fontfile}**: A TTF font file to use to create textures.
**{fontname}**: The font name to be used in font_api (should be simple, with no spaces).
**{fontsize}**: Font height to be rendered.
### make_font_lua.sh
This script analyses textures in textures directory and creates a font\_{font\_name}.lua files with a call to register_font with images information. Launch it from your future font mod directory.
Once the font\_{font\_name}.lua created, it can be included by a init.lua file or directly renamed to init.lua if you are creating a simple font mod.
__Syntax__
**make\_font_lua.sh {fontname}**
**{fontname}**: The font name to be used in font_api (same as given to make\_font\_texture.sh)
### An exemple generating a font mod
mkdir font_myfont
cd font_myfont
/<path_to_font_api>/tools/make_font_texture.sh myfont.ttf myfont 12
/<path_to_font_api>/tools/make_font_lua.sh myfont
mv font_myfont.lua init.lua
## Font class
A font usable with font API. This class is supposed to be for internal use but who knows.
### font\_api.Font:new(def)
Create a new font object.
* `def` is a table containing font definition. See **Font definition table** above.
### font:get_char_width(codepoint)
Returns the width of char `codepoint` in texture pixels.
* `codepoint`: Unicode codepoint of char.
### font:get_height(nb_of_lines)
Returns line(s) height. Takes care of top and bottom margins and line spacing.
* `nb_of_lines`: Number of lines in the text.
### font:get_width(line)
Returns the width of a text line. Beware, if line contains any new line char, they are ignored.
* `line`: Line of text which the width will be computed.
### font:renter(text, texturew, textureh, style)
Builds texture for a multiline colored text.
* `text`: Text to be rendered.
* `texturew`: Width of the texture (extra text will be truncated).
* `textureh`: Height of the texture (extra text will be truncated).
* `style`: A table with style indications:
- `lines` or `maxlines`: Maximum number of lines (default none).
- `halign`: Horizontal text align: "left"/"center"/"right" (default "center")
- `valign`: Vertical text align: "top"/"middle"/"bottom" (default "middle")
- `color`: Color of the text (default black)

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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
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As used herein, "this License" refers to version 3 of the GNU Lesser
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# Font API
A library for rendernig text on textures (to be used with display_api for sign creation).
**Dependancies**: default
**License**: LGPL
(Default font taken from VanessaE's homedecor/signs_lib, originally under WTFPL)
**API**: See [API.md](https://github.com/pyrollo/display_modpack/blob/master/font_api/API.md) document please.
For more information, see the [forum topic](https://forum.minetest.net/viewtopic.php?t=13563) at the Minetest forums.
## Extra fonts
You can add fonts by installing fonts mod. Be aware that each font comes with numerous textures. This can result in slowing media downloading and/or client display.
Font mods can be found here:
* [Metro](https://github.com/pyrollo/display_modpack/tree/master/font_metro): A multipurpose font with many chars (uppercase, lowercase and accentuated latin letters, usual signs, cyrillic and greek letters).
* [OldWizard](https://github.com/pyrollo/font_oldwizard): An old style gothic font.
* [Botic](https://github.com/pyrollo/font_botic): A scifi style font.
## Deprecation notice (for modders)
### December 2018
Following object is deprecate, shows a warning in log when used:
* `font_lib` global table (use `font_api` global table instead);
This object will be removed in the future.

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Code by Pierre-Yves Rollo (pyrollo)
Contributors:
Andrzej Pieńkowski (apienk): Unicode support and tool for creating texturess

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display_api?

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Deprecation
function deprecated_global_table(deprecated_global_name, replacement_global_name)
assert(type(deprecated_global_name) == 'string', "deprecated_global_name should be a string.")
assert(type(replacement_global_name) == 'string', "replacement_global_name should be a string.")
assert(deprecated_global_name ~= '', "deprecated_global_name should not be empty.")
assert(replacement_global_name ~= '', "replacement_global_name should not be empty.")
assert(rawget(_G, deprecated_global_name) == nil, "deprecated global does not exist.")
if _G[replacement_global_name] == nil then
minetest.log('warning', string.format(
'Replacement global "%s" does not exists.', replacement_global_name))
return
end
local meta = {
deprecated = deprecated_global_name,
replacement = replacement_global_name,
__index = function(table, key)
local meta = getmetatable(table)
local dbg = debug.getinfo(2, "lS")
minetest.log("warning", string.format(
'Accessing deprecated "%s" table, "%s" should be used instead (%s:%d).',
meta.deprecated, meta.replacement, (dbg.short_src or 'unknown'),
(dbg.currentline or 0)))
return _G[meta.replacement][key]
end,
__newindex = function(table, key, value)
local meta = getmetatable(table)
local dbg = debug.getinfo(2, "lS")
minetest.log("warning", string.format(
'Accessing deprecated "%s" table, "%s" should be used instead (%s:%d).',
meta.deprecated, meta.replacement, (dbg.short_src or 'unknown'),
(dbg.currentline or 0)))
_G[meta.replacement][key]=value
end,
}
rawset(_G, deprecated_global_name, {})
setmetatable(_G[deprecated_global_name], meta)
end
-- deprecated(2) -- December 2018 - Deprecation of font_lib
deprecated_global_table('font_lib', 'font_api')

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Integration with display API
if minetest.get_modpath("display_api") then
--- Standard on_display_update entity callback.
-- Node should have properly configured display_entity.
-- @param pos Node position
-- @param objref Object reference of entity
font_api.on_display_update = function (pos, objref)
local meta = minetest.get_meta(pos)
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
local entity = objref:get_luaentity()
if not entity or not ndef.display_entities[entity.name] then
return
end
local def = ndef.display_entities[entity.name]
local font = font_api.get_font(meta:get_string("font") ~= ""
and meta:get_string("font") or def.font_name)
local text = meta:get_string(def.meta_text or "display_text")
-- Compute entity resolution accroding to given attributes
local texturew, textureh
textureh = font:get_height(def.lines or def.maxlines or 1)
if def.columns then
if font.fixedwidth then
texturew = def.columns * font.fixedwidth
if def.aspect_ratio then
minetest.log('warning', "[font_api] 'aspect_ratio' ignored because 'columns' is specified")
end
else
minetest.log('warning', "[font_api] 'columns' ignored because '"..font.name.."' is not a fixed width font.")
end
end
if not texturew then
if not def.aspect_ratio then
minetest.log('warning', "[font_api] No 'aspect_ratio' specified, using default 1.")
end
texturew = textureh * def.size.x / def.size.y / (def.aspect_ratio or 1)
end
objref:set_properties({
textures={ font:render(text, texturew, textureh, {
lines = def.maxlines or def.lines,
halign = def.halign,
valign = def.valign,
color = def.color} ) },
visual_size = def.size,
})
end
else
font_api.on_display_update = function (pos, objref)
minetest.log('error', '[font_api] font_api.on_display_update called but display_api mod not enabled.')
end
end

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- This is the unicode char fallback map. If a char is not present in
-- font, this maps indicates which char to try to use instead next.
return {
-- Lowercase chars
['a'] = 'A', ['b'] = 'B', ['c'] = 'C', ['d'] = 'D',
['e'] = 'E', ['f'] = 'F', ['g'] = 'G', ['h'] = 'H',
['i'] = 'I', ['j'] = 'J', ['k'] = 'K', ['l'] = 'L',
['m'] = 'M', ['n'] = 'N', ['o'] = 'O', ['p'] = 'P',
['q'] = 'Q', ['r'] = 'R', ['s'] = 'S', ['t'] = 'T',
['u'] = 'U', ['v'] = 'V', ['w'] = 'W', ['x'] = 'X',
['y'] = 'Y', ['z'] = 'Z',
-- Special
['¢'] = 'c', ['£'] = 'L', ['¥'] = 'Y', ['€'] = 'E',
['©'] = '(C)', ['®'] = '(R)', ['™'] = 'TM',
['ª'] = 'a', ['º'] = 'o',
['«'] = '"', ['»'] = '"', ['´'] = '\'',
['¹'] = '1', ['²'] = '2', ['³'] = '3',
['µ'] = 'u', ['¤'] = 'o',
['¼'] = '1/4', ['½'] = '1/2', ['¾'] = '3/4',
['⅛'] = '1/8', ['⅜'] = '3/8', ['⅝'] = '5/8', ['⅞'] = '7/8',
['¿'] = '?',
-- Upper case accents
['À'] = 'A', ['Á'] = 'A', ['Â'] = 'A', ['Ã'] = 'A',
['Ä'] = 'A', ['Å'] = 'A',
['Æ'] = 'AE', ['Ç'] = 'C',
['È'] = 'E', ['É'] = 'E', ['Ê'] = 'E', ['Ë'] = 'E',
['Ì'] = 'I', ['Í'] = 'I', ['Î'] = 'I', ['Ï'] = 'I',
['Ð'] = 'D', ['Ñ'] = 'N',
['Ò'] = 'O', ['Ó'] = 'O', ['Ô'] = 'O', ['Õ'] = 'O',
['Ö'] = 'O', ['Ø'] = 'O',
['Ú'] = 'U', ['Ù'] = 'U', ['Û'] = 'U', ['Ü'] = 'U',
['×'] = 'x', ['Ý'] = 'Y',
-- Lower case accents
['à'] = 'a', ['à'] = 'a', ['á'] = 'a', ['â'] = 'a',
['ã'] = 'a', ['ä'] = 'a', ['å'] = 'a',
['æ'] = 'ae', ['ç'] = 'c',
['è'] = 'e', ['é'] = 'e', ['ê'] = 'e', ['ë'] = 'e',
['ì'] = 'i', ['í'] = 'i', ['î'] = 'i', ['ï'] = 'i',
['ð'] = 'd', ['ñ'] = 'n',
['ò'] = 'o', ['ó'] = 'o', ['ô'] = 'o', ['õ'] = 'o',
['ö'] = 'o', ['ø'] = 'o',
['ù'] = 'u', ['ú'] = 'u', ['û'] = 'u', ['ü'] = 'u',
['ý'] = 'y', ['ÿ'] = 'y',
-- Extended latin A
['Ā'] = 'A', ['ā'] = 'a', ['Ă'] = 'A', ['ă'] = 'a',
['Ą'] = 'A', ['ą'] = 'a', ['Ć'] = 'C', ['ć'] = 'c',
['Ĉ'] = 'C', ['ĉ'] = 'c', ['Ċ'] = 'C', ['ċ'] = 'c',
['Č'] = 'C', ['č'] = 'c', ['Ď'] = 'D', ['ď'] = 'd',
['Đ'] = 'D', ['đ'] = 'd', ['Ē'] = 'E', ['ē'] = 'e',
['Ĕ'] = 'E', ['ĕ'] = 'e', ['Ė'] = 'E', ['ė'] = 'e',
['Ę'] = 'E', ['ę'] = 'e', ['Ě'] = 'E', ['ě'] = 'e',
['Ĝ'] = 'G', ['Ğ'] = 'G', ['ğ'] = 'g', ['ĝ'] = 'g',
['Ġ'] = 'G', ['ġ'] = 'g', ['Ģ'] = 'G', ['ģ'] = 'g',
['Ĥ'] = 'H', ['ĥ'] = 'h', ['Ħ'] = 'H', ['ħ'] = 'h',
['Ĩ'] = 'I', ['ĩ'] = 'i', ['Ī'] = 'I', ['ī'] = 'i',
['Ĭ'] = 'I', ['ĭ'] = 'i', ['Į'] = 'I', ['į'] = 'i',
['ı'] = 'i', ['İ'] = 'I', ['IJ'] = 'IJ', ['ij'] = 'ij',
['Ĵ'] = 'J', ['ĵ'] = 'j', ['ķ'] = 'k', ['Ķ'] = 'K',
['ĸ'] = 'k',
['Ĺ'] = 'L', ['ĺ'] = 'l', ['Ļ'] = 'L', ['ļ'] = 'l',
['Ľ'] = 'L', ['ľ'] = 'l', ['Ŀ'] = 'L', ['ŀ'] = 'l',
['Ł'] = 'L', ['ł'] = 'l', ['Ń'] = 'N', ['ń'] = 'n',
['Ņ'] = 'N', ['ņ'] = 'n', ['Ň'] = 'N', ['ň'] = 'n',
['ʼn'] = 'n', ['Ŋ'] = 'n', ['ŋ'] = 'n',
['Ō'] = 'O', ['ō'] = 'o', ['Ŏ'] = 'O', ['ŏ'] = 'o',
['ő'] = 'o', ['Ő'] = 'O', ['œ'] = 'oe', ['Œ'] = 'OE',
['Ŕ'] = 'R', ['ŕ'] = 'r', ['Ŗ'] = 'R', ['ŗ'] = 'r',
['Ř'] = 'R', ['ř'] = 'r', ['Ś'] = 'S', ['ś'] = 's',
['Ŝ'] = 'S', ['ŝ'] = 's', ['Ş'] = 'S', ['ş'] = 's',
['Š'] = 'S', ['š'] = 's', ['Ţ'] = 'T', ['ţ'] = 't',
['ť'] = 't', ['Ŧ'] = 'T', ['Ť'] = 'T', ['ŧ'] = 't',
['Ũ'] = 'U', ['ũ'] = 'u', ['Ū'] = 'U', ['ū'] = 'u',
['Ŭ'] = 'U', ['ŭ'] = 'u', ['Ů'] = 'U', ['ů'] = 'u',
['Ű'] = 'U', ['ű'] = 'u', ['Ų'] = 'U', ['ų'] = 'u',
['Ŵ'] = 'W', ['ŵ'] = 'w', ['Ŷ'] = 'Y', ['ŷ'] = 'y',
['Ÿ'] = 'Y',
['Ź'] = 'Z', ['ź'] = 'z', ['Ż'] = 'Z', ['ż'] = 'z',
['Ž'] = 'Z', ['ž'] = 'z', ['ſ'] = 's',
-- Extended latin B
['ƀ'] = 'b', ['Ɓ'] = 'B', ['Ƃ'] = 'B', ['ƃ'] = 'b',
['Ɔ'] = 'O',
['Ƈ'] = 'C', ['ƈ'] = 'c', ['Ɖ'] = 'D', ['Ɗ'] = 'D',
['Ƌ'] = 'D', ['ƌ'] = 'd', ['Ǝ'] = 'E', ['Ə'] = 'e',
['Ɛ'] = 'E',
['Ƒ'] = 'F', ['ƒ'] = 'f', ['Ɠ'] = 'G',
['ƕ'] = 'hv', ['Ɨ'] = 'I', ['Ƙ'] = 'K', ['ƙ'] = 'k',
['ƚ'] = 'l', ['Ɯ'] = 'M', ['Ɲ'] = 'N', ['ƞ'] = 'n',
['Ɵ'] = 'O',
['Ơ'] = 'O', ['ơ'] = 'o', ['Ƣ'] = 'OI', ['ƣ'] = 'oi',
['Ƥ'] = 'P', ['ƥ'] = 'p', ['Ʀ'] = 'YR',
['Ƨ'] = 'S', ['ƨ'] = 's', ['ƫ'] = 't',
['Ƭ'] = 'T', ['ƭ'] = 't', ['Ʈ'] = 'T',
['Ư'] = 'U', ['ư'] = 'u', ['Ʋ'] = 'V',
['Ƴ'] = 'Y', ['ƴ'] = 'y', ['Ƶ'] = 'Z', ['ƶ'] = 'z',
['ƻ'] = '2', ['Ƽ'] = '5', ['ƽ'] = '5',
['DŽ'] = 'DZ', ['Dž'] = 'Dz', ['dž'] = 'dz',
['LJ'] = 'LJ', ['Lj'] = 'Lj', ['lj'] = 'lj',
['NJ'] = 'NJ', ['Nj'] = 'Nj', ['nj'] = 'nj',
['Ǎ'] = 'A', ['ǎ'] = 'a', ['Ǐ'] = 'I', ['ǐ'] = 'i',
['Ǒ'] = 'O', ['ǒ'] = 'o', ['Ǔ'] = 'U', ['ǔ'] = 'u',
['Ǖ'] = 'U', ['ǖ'] = 'u', ['Ǘ'] = 'U', ['ǘ'] = 'u',
['Ǚ'] = 'U', ['ǚ'] = 'u', ['Ǜ'] = 'U', ['ǜ'] = 'u',
['ǝ'] = 'e',
['Ǟ'] = 'A', ['ǟ'] = 'a', ['Ǡ'] = 'A', ['ǡ'] = 'a',
['Ǣ'] = 'Æ', ['ǣ'] = 'æ', ['Ǥ'] = 'G', ['ǥ'] = 'g',
['Ǧ'] = 'G', ['ǧ'] = 'g', ['Ǩ'] = 'K', ['ǩ'] = 'k',
['Ǫ'] = 'Q', ['ǫ'] = 'q', ['Ǭ'] = 'Q', ['ǭ'] = 'q',
['ǰ'] = 'J',
['DZ'] = 'DZ', ['Dz'] = 'Dz', ['dz'] = 'dz',
['Ǵ'] = 'G', ['ǵ'] = 'g', ['Ƕ'] = 'H',
['Ǹ'] = 'N', ['ǹ'] = 'n', ['Ǻ'] = 'A', ['ǻ'] = 'a',
['Ǽ'] = 'Æ', ['ǽ'] = 'æ', ['Ǿ'] = 'Ø', ['ǿ'] = 'ø',
['Ȁ'] = 'A', ['ȁ'] = 'a', ['Ȃ'] = 'A', ['ȃ'] = 'a',
['Ȅ'] = 'E', ['ȅ'] = 'e', ['Ȇ'] = 'E', ['ȇ'] = 'e',
['Ȉ'] = 'I', ['ȉ'] = 'i', ['Ȋ'] = 'I', ['ȋ'] = 'i',
['Ȍ'] = 'O', ['ȍ'] = 'o', ['Ȏ'] = 'O', ['ȏ'] = 'o',
['Ȑ'] = 'R', ['ȑ'] = 'r', ['Ȓ'] = 'R', ['ȓ'] = 'r',
['Ȕ'] = 'U', ['ȕ'] = 'u', ['Ȗ'] = 'U', ['ȗ'] = 'u',
['Ș'] = 'S', ['ș'] = 's', ['Ț'] = 'T', ['ț'] = 't',
['Ȟ'] = 'H', ['ȟ'] = 'h', ['Ƞ'] = 'N',
['ȡ'] = 'd',
['Ȣ'] = 'OU', ['ȣ'] = 'ou', ['Ȥ'] = 'Z', ['ȥ'] = 'z',
['Ȧ'] = 'A', ['ȧ'] = 'a', ['Ȩ'] = 'E', ['ȩ'] = 'e',
['Ȫ'] = 'O', ['ȫ'] = 'o', ['Ȭ'] = 'O', ['ȭ'] = 'o',
['Ȯ'] = 'O', ['ȯ'] = 'o', ['Ȱ'] = 'O', ['ȱ'] = 'o',
['Ȳ'] = 'Y', ['ȳ'] = 'y', ['ȴ'] = 'l',
['ȵ'] = 'n', ['ȶ'] = 't', ['ȷ'] = 'j',
['ȸ'] = 'db', ['ȹ'] = 'qp', ['Ⱥ'] = 'A',
['Ȼ'] = 'C', ['ȼ'] = 'c', ['Ƚ'] = 'L',
['Ⱦ'] = 'T', ['ȿ'] = 's', ['ɀ'] = 'z',
['Ƀ'] = 'B', ['Ʉ'] = 'U', ['Ʌ'] = 'V',
['Ɇ'] = 'E', ['ɇ'] = 'e', ['Ɉ'] = 'J', ['ɉ'] = 'j',
['Ɋ'] = 'Q', ['ɋ'] = 'q', ['Ɍ'] = 'R', ['ɍ'] = 'r',
['Ɏ'] = 'Y', ['ɏ'] = 'y', ['ɐ'] = 'a',
['ɓ'] = 'b', ['ɔ'] = 'o',
['ɕ'] = 'c', ['ɖ'] = 'd', ['ɗ'] = 'd',
['ɘ'] = 'e', ['ə'] = 'e', ['ɚ'] = 'e',
['ɛ'] = 'e', ['ɜ'] = 'e', ['ɝ'] = 'e', ['ɞ'] = 'e',
['ɟ'] = 'j',
['ɠ'] = 'g', ['ɡ'] = 'g', ['ɢ'] = 'G',
['ɥ'] = 'h', ['ɦ'] = 'h', ['ɧ'] = 'h',
['ɨ'] = 'i', ['ɪ'] = 'I',
['ɫ'] = 'l', ['ɬ'] = 'l', ['ɭ'] = 'l',
['ɮ'] = 'lz',
['ɯ'] = 'm', ['ɰ'] = 'm', ['ɱ'] = 'm',
['ɲ'] = 'n', ['ɳ'] = 'n', ['ɴ'] = 'N',
['ɵ'] = 'o', ['ɶ'] = 'Œ',
['ɹ'] = 'r', ['ɺ'] = 'r', ['ɻ'] = 'r',
['ɼ'] = 'r', ['ɽ'] = 'r', ['ɾ'] = 'r', ['ɿ'] = 'r',
}

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Fallback table
local fallbacks = dofile(font_api.path.."/fallbacks.lua")
-- Local functions
------------------
-- Returns number of UTF8 bytes of the first char of the string
local function get_char_bytes(str)
local msb = str:byte(1)
if msb ~= nil then
if msb < 0x80 then return 1 end
if msb >= 0xF0 then return 4 end
if msb >= 0xE0 then return 3 end
if msb >= 0xC2 then return 2 end
end
end
-- Returns the unicode codepoint of the first char of the string
local function char_to_codepoint(str)
local bytes = get_char_bytes(str)
if bytes == 1 then
return str:byte(1)
elseif bytes == 2 and str:byte(2) ~= nil then
return (str:byte(1) - 0xC2) * 0x40
+ str:byte(2)
elseif bytes == 3 and str:byte(2) ~= nil and str:byte(3) ~= nil then
return (str:byte(1) - 0xE0) * 0x1000
+ str:byte(2) % 0x40 * 0x40
+ str:byte(3) % 0x40
elseif bytes == 4 and str:byte(2) ~= nil and str:byte(3) ~= nil
and str:byte(4) ~= nil then -- Not tested
return (str:byte(1) - 0xF0) * 0x40000
+ str:byte(2) % 0x40 * 0x1000
+ str:byte(3) % 0x40 * 0x40
+ str:byte(4) % 0x40
end
end
--------------------------------------------------------------------------------
--- Font class
local Font = {}
font_api.Font = Font
function Font:new(def)
if type(def) ~= "table" then
minetest.log("error",
"[font_api] Font definition must be a table.")
return nil
end
if def.height == nil or def.height <= 0 then
minetest.log("error",
"[font_api] Font definition must have a positive height.")
return nil
end
if type(def.widths) ~= "table" then
minetest.log("error",
"[font_api] Font definition must have a widths array.")
return nil
end
if def.widths[0] == nil then
minetest.log("error",
"[font_api] Font must have a char with codepoint 0 (=unknown char).")
return nil
end
local font = table.copy(def)
setmetatable(font, self)
self.__index = self
-- Check if fixedwidth
for codepoint, width in pairs(font.widths) do
font.fixedwidth = font.fixedwidth or width
if width ~= font.fixedwidth then
font.fixedwidth = nil
break
end
end
return font
end
--- Gets the next char of a text
-- @return Codepoint of first char,
-- @return Remaining string without this first char
function Font:get_next_char(text)
local bytes = get_char_bytes(text)
if bytes == nil then
minetest.log("warning",
"[font_api] Encountered a non UTF char, not displaying text.")
return nil, ''
end
local codepoint = char_to_codepoint(text)
if codepoint == nil then
minetest.log("warning",
"[font_api] Encountered a non UTF char, not displaying text.")
return nil, ''
end
-- Fallback mechanism
if self.widths[codepoint] == nil then
local char = text:sub(1, bytes)
if fallbacks[char] then
return self:get_next_char(fallbacks[char]..text:sub(bytes+1))
else
return 0, text:sub(bytes+1) -- Ultimate fallback
end
else
return codepoint, text:sub(bytes+1)
end
end
--- Returns the width of a given char
-- @param char : codepoint of the char
-- @return Char width
function Font:get_char_width(codepoint)
if self.fixedwidth then
return self.fixedwidth
elseif self.widths[codepoint] then
return self.widths[codepoint]
else
return self.widths[0]
end
end
--- Text height for multiline text including margins and line spacing
-- @param nb_of_lines : number of text lines (default 1)
-- @return Text height
function Font:get_height(nb_of_lines)
if nb_of_lines == nil then nb_of_lines = 1 end
if nb_of_lines > 0 then
return
(
(self.height or 0) +
(self.margintop or 0) +
(self.marginbottom or 0)
) * nb_of_lines +
(self.linespacing or 0) * (nb_of_lines -1)
else
return nb_of_lines == 0 and 0 or nil
end
end
--- Computes text width for a given text (ignores new lines)
-- @param line Line of text which the width will be computed.
-- @return Text width
function Font:get_width(line)
local codepoint
local width = 0
line = line or ''
while line ~= "" do
codepoint, line = self:get_next_char(line)
if codepoint == nil then return 0 end -- UTF Error
width = width + self:get_char_width(codepoint)
end
return width
end
--- Legacy make_text_texture method (replaced by "render" - Dec 2018)
function Font:make_text_texture(text, texturew, textureh, maxlines,
halign, valign, color)
return self:render(text, texturew, textureh, {
lines = maxlines,
valign = valign,
halign = halign,
color = color
})
end
--- Render text with the font in a view
-- @param text Text to be rendered
-- @param texturew Width (in pixels) of the texture (extra text will be truncated)
-- @param textureh Height (in pixels) of the texture (extra text will be truncated)
-- @param style Style of the rendering:
-- - lines: maximum number of text lines (if text is limited)
-- - halign: horizontal align ("left"/"center"/"right")
-- - valign: vertical align ("top"/"center"/"bottom")
-- - color: color of the text ("#rrggbb")
-- @return Texture string
function Font:render(text, texturew, textureh, style)
local style = style or {}
-- Split text into lines (and limit to style.lines # of lines)
local lines = {}
local pos = 1
local found, line
repeat
found = string.find(text, "\n", pos) or (#text + 1)
line = string.sub(text, pos, found - 1)
lines[#lines + 1] = { text = line, width = self:get_width(line) }
pos = found + 1
until (style.lines and (#lines >= style.lines)) or (pos > (#text + 1))
if not #lines then
return ""
end
local x, y, codepoint
local texture = ""
local textheight = self:get_height(#lines)
if style.valign == "top" then
y = 0
elseif style.valign == "bottom" then
y = textureh - textheight
else
y = (textureh - textheight) / 2
end
y = y + (self.margintop or 0)
for _, line in pairs(lines) do
if style.halign == "left" then
x = 0
elseif style.halign == "right" then
x = texturew - line.width
else
x = (texturew - line.width) / 2
end
while line.text ~= '' do
codepoint, line.text = self:get_next_char(line.text)
if codepoint == nil then return '' end -- UTF Error
-- Add image only if it is visible (at least partly)
if x + self.widths[codepoint] >= 0 and x <= texturew then
texture = texture..
string.format(":%d,%d=font_%s_%04x.png", x, y, self.name, codepoint)
end
x = x + self.widths[codepoint]
end
y = y + self:get_height() + (self.linespacing or 0)
end
texture = string.format("[combine:%dx%d", texturew, textureh)..texture
if style.color then
texture = texture.."^[colorize:"..style.color
end
return texture
end

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
local modname = minetest.get_current_modname()
local contexts = {}
minetest.register_on_leaveplayer(function(player)
if minetest.is_player(player) then
contexts[player:get_player_name()] = nil
end
end)
local function get_context(playername)
if not contexts[playername] then
contexts[playername] = { playername = playername }
end
return contexts[playername]
end
-- Show node formspec functions
local function show_node_formspec(playername, pos)
local meta = minetest.get_meta(pos)
-- Decontextualize formspec
local fs = meta:get_string('formspec')
if not fs then
return
end
-- Change context and currrent_name references to nodemeta references
-- Change context and currrent_name references to nodemeta references
local nodemeta = string.format("nodemeta:%i,%i,%i", pos.x, pos.y ,pos.z)
fs = fs:gsub("current_name", nodemeta)
fs = fs:gsub("context", nodemeta)
-- Change all ${} to their corresponding metadata values
local s, e
repeat
s, e = fs:find('%${.*}')
if s and e then
fs = fs:sub(1, s-1)..
minetest.formspec_escape(meta:get_string(fs:sub(s+2,e-1)))..
fs:sub(e+1)
end
until s == nil
local context = get_context(playername)
context.node_pos = pos
-- Find node on_receive_fields
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
if ndef and ndef.on_receive_fields then
context.on_receive_fields = ndef.on_receive_fields
end
-- Show formspec
minetest.show_formspec(playername, modname..':context_formspec', fs)
end
minetest.register_on_player_receive_fields(function(player, formname, fields)
if formname ~= modname..':context_formspec' then
return
end
if not minetest.is_player(player) then
return true
end
local context = get_context(player:get_player_name())
if context.on_receive_fields then
context.on_receive_fields(context.pos, '', fields, player)
end
return true
end)
-- Specific functions
local function show_font_formspec(playername)
local context = get_context(playername)
local fonts = {}
for name, _ in pairs(font_api.registered_fonts) do
fonts[#fonts+1] = name
end
table.sort(fonts)
local fs = string.format(
"size[4,%s]%s%s%sbutton_exit[0,%s;4,1;cancel;Cancel]",
#fonts + 0.8, default.gui_bg, default.gui_bg_img, default.gui_slots,
#fonts)
for line = 1, #fonts do
local font = font_api.get_font(fonts[line])
local texture = font:make_text_texture(font.name, font:get_height()*5,
font:get_height()*1.2, 1, "center", "top", "#fff")
fs = string.format(
"%simage[0.1,%s;4.5,0.8;%s]button_exit[0,%s;4,1;font_%s;]",
fs, line-0.9, texture, line-1, font.name)
end
minetest.show_formspec(context.playername, modname..':font_list', fs)
end
minetest.register_on_player_receive_fields(function(player, formname, fields)
if formname ~= modname..':font_list' then
return
end
if not minetest.is_player(player) then
return true
end
local playername = player:get_player_name()
local context = get_context(playername)
if not context.pos
or minetest.is_protected(context.pos, playername) then
return true
end
if fields.quit == 'true' then
for name, _ in pairs(font_api.registered_fonts) do
if fields['font_'..name] then
local meta = minetest.get_meta(context.pos)
meta:set_string("font", name)
display_api.update_entities(context.pos)
end
end
if context.callback and type(context.callback) == "function" then
-- Using after to avoid the "double close" bug
minetest.after(0, context.callback, playername, context.pos)
else
-- Using after to avoid the "double close" bug
minetest.after(0, show_node_formspec, playername, context.pos)
end
end
return true
end)
-- @param player Player viewing the form
-- @param pos Node pos
-- @param callback function(playername, pos) to be called on form close
function font_api.show_font_list(player, pos, callback)
if minetest.is_player(player) then
local context = get_context(player:get_player_name())
context.pos = pos
context.callback = callback
show_font_formspec(player:get_player_name())
end
end

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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Global variables
-------------------
font_api = {}
font_api.name = minetest.get_current_modname()
font_api.path = minetest.get_modpath(font_api.name)
-- Inclusions
-------------
dofile(font_api.path.."/font.lua")
dofile(font_api.path.."/registry.lua")
dofile(font_api.path.."/fontform.lua")
if minetest.get_modpath("display_api") then
dofile(font_api.path.."/display_api.lua")
end
dofile(font_api.path.."/deprecation.lua")

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name=font_api
description=A library for rendernig text on textures
optional_depends=display_api

160
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--[[
font_api mod for Minetest - Library creating textures with fonts and text
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Global variables
-------------------
font_api.registered_fonts = {}
font_api.registered_fonts_number = 0
-- Local variables
------------------
local default_font = false
-- Local functions
------------------
-- Gets a default (settings or fist font)
local function get_default_font()
-- First call
if default_font == false then
default_font = nil
-- First, try with settings
local settings_font = minetest.settings:get("default_font")
if settings_font ~= nil and settings_font ~= "" then
default_font = font_api.registered_fonts[settings_font]
if default_font == nil then
minetest.log("warning", "Default font in settings (\""..
settings_font.."\") is not registered.")
end
end
-- If failed, choose first font without default = false
if default_font == nil then
for _, font in pairs(font_api.registered_fonts) do
if font.default then
default_font = font
break
end
end
end
-- If failed, chose first font
if default_font == nil then
for _, font in pairs(font_api.registered_fonts) do
default_font = font
break
end
end
-- Error, no font registered
if default_font == nil then
minetest.log("error",
"No font registred, unable to choose a default font.")
end
end
return default_font
end
--- Returns font object to be used according to font_name
-- @param font_name: Name of the font
-- @return Font object if font found (or default font)
function font_api.get_font(font_name)
local font = font_api.registered_fonts[font_name]
if font == nil then
local message
if font_name == nil then
message = "No font given"
else
message = "Font \""..font_name.."\" unregistered"
end
font = get_default_font()
if font ~= nil then
minetest.log("info", message..", using font \""..font.name.."\".")
end
end
return font
end
-- API functions
----------------
--- Returns de default font name
-- @return Default font name
function font_api.get_default_font_name()
return get_default_font().name
end
--- Register a new font
-- Textures corresponding to the font should be named after following patern :
-- font_<name>_<code>.png
-- <name> : name of the font
-- <code> : 4 digit hexadecimal unicode of the char
-- @param font_name Name of the font to register
-- If registering different sizes of the same font, add size in the font name
-- (e.g. times_10, times_12...).
-- @param def font definition. A associative array with following keys :
-- @key default True (by default) if this font may be used as default font
-- @key height (mandatory) Height in pixels of all font textures
-- @key widths (mandatory) Array of character widths in pixels, indexed by
-- UTF codepoints
-- @key margintop (optional) Margin (in texture pixels) added on top of each
-- char texture.
-- @key marginbottom (optional) dded at bottom of each char texture.
-- @key linespacing (optional) Spacing (in texture pixels) between each lines.
-- margintop, marginbottom and linespacing can be negative numbers (default 0)
-- and are to be used to adjust various font styles to each other.
-- TODO: Add something to remove common accent if not defined in font
function font_api.register_font(font_name, font_def)
if font_api.registered_fonts[font_name] ~= nil then
minetest.log("error", "Font \""..font_name.."\" already registered.")
return
end
local font = font_api.Font:new(font_def)
if font == nil then
minetest.log("error", "Unable to register font \""..font_name.."\".")
return
end
font.name = font_name
font_api.registered_fonts[font_name] = font
font_api.registered_fonts_number = font_api.registered_fonts_number + 1
-- Force to choose again default font
-- (allows use of fonts registered after start)
default_font = false
minetest.log("action", "New font registered in font_api: "..font_name..".")
end

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default_font(Default font) string

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#!/bin/bash
scriptname=$(basename $0)
identify="identify"
usage() {
echo "Usage: $0 fontname"
echo "fontname: The name of the font. Must correspond to existing texture/font_<fontname>_????.png files"
}
if [ $# -ne 1 ]
then
usage
exit 1
fi
font_name=$1
for f in textures/font_${font_name}_????.png
do
if [[ $f =~ textures/font_${font_name}_([0-9a-fA-F]{4}).png ]]
then
code=$((16#${BASH_REMATCH[1]}))
size=$(identify $f | cut -d " " -f 3)
w=$(echo $size | cut -d "x" -f 1)
h=$(echo $size | cut -d "x" -f 2)
if [ -z "$font_height" ]
then
font_height=$h
else
if [ $font_height -ne $h ]
then
echo "Error : $f as height of $h pixels, previous textures have a height of $font_height pixels. All textures should have the same height."
fi
fi
if [ -z "$font_widths" ]
then
font_widths="[$code]=$w"
else
font_widths="$font_widths, [$code]=$w"
fi
fi
done
echo "--[[
$luafile generated by $scriptname $(LANG=en_US date)
--]]
font_api.register_font(
'$font_name',
{
height = $font_height,
widths = {
$font_widths
},
}
);
" > font_$font_name.lua
if grep -q font_api depends.txt &>/dev/null
then
echo "font_api already in depends.txt."
else
echo "adding font_api to depends.txt."
echo "font_api" >> depends.txt
fi

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#!/bin/bash
# This program generates a bitmap font for font_api mod for Minetest game.
# (c) Andrzej Pieńkowski <pienkowski.andrzej@gmail.com>
# (c) Pierre-Yves Rollo <dev@pyrollo.com>
# License: GPL
usage() {
echo "Usage: $0 fontfile fontname fontsize"
echo "fontfile: A TTF font file to use to create textures."
echo "fontname: The font name to be used in font_api (should be simple, with no spaces)."
echo "fontsize: Font height to be rendered."
}
if [ $# -ne 3 ]
then
usage
exit 1
fi
fontfile=$1
fontname=$2
fontsize=$3
if [ ! -r "$fontfile" ]
then
echo "$fontfile not readable."
exit 1
fi
# check imagemagick
hash convert &>/dev/null
if [ $? -eq 1 ]; then
echo -e "Error: This program requires convert from ImageMagick! Please install it by typing 'sudo apt-get install imagemagick' in terminal."
abort=1
fi
# check ttx
hash ttx &>/dev/null
if [ $? -eq 1 ]; then
echo -e "Error: This program requires ttx from FontTools! Please install it by typing 'sudo apt-get install fonttools' in terminal."
abort=1
fi
if [ $abort ]
then
exit 1
fi
generate() {
for i in $(seq $((0x$1)) $((0x$2)))
do
if echo "$codepoints" | grep -qi $(printf "0x%x" $i)
then
hex=$(printf "%04x" $i)
echo -e "Generating textures/font_${fontname}_$hex.png file for \"\\U$hex\" char."
if [[ "$hex" == "005c" ]] # Backslash char
then
convert -background none -fill black -font "$fontfile" -pointsize $fontsize label:"\\\\" -colorspace gray -channel alpha -threshold 50% textures/font_${fontname}_$hex.png
else
convert -background none -fill black -font "$fontfile" -pointsize $fontsize label:"$(echo -en "\\U$hex")" -colorspace gray -channel alpha -threshold 50% textures/font_${fontname}_$hex.png
fi
fi
done
}
mkdir textures
# Reads all available code points in the font.
codepoints=$(ttx -o - "$fontfile" | grep "<map code=" | cut -d \" -f 2)
# Mandatory chars
generate 0020 007f
# generate space and null characters
if [ ! -f "textures/font_${fontname}_0030.png" ]; then
echo "Error: Something wrong happened! Font was not generated!"
exit 1
else
size=$(identify textures/font_${fontname}_0030.png | cut -d " " -f 3)
if ! [[ $fontHeight =~ $re ]] ; then
echo "Error: Something wrong happened! Generated files might be broken!"
exit 1
else
w=$(expr $(echo $size | cut -d x -f 1) - 1)
h=$(expr $(echo $size | cut -d x -f 2) - 1)
# Space char
convert -size $size xc:transparent -colorspace gray textures/font_${fontname}_0020.png
# Null char
convert -size $size xc:transparent -colorspace gray -stroke black -fill transparent -strokewidth 1 -draw "rectangle 0,0 $w,$h" textures/font_${fontname}_0000.png
fi
fi
# Optional Unicode pages (see https://en.wikipedia.org/wiki/Unicode) :
# 00a0-00ff Latin-1 Supplement (full)
generate 00a0 00ff
# 0100-017f Latin Extended-A (full)
generate 0100 017f
# 0370-03ff Greek (full)
generate 0370 03ff
# 0400-04ff Cyrilic (full)
generate 0400 04ff
# 2000-206f General Punctuation (Limited to Dashes)
generate 2010 2015
# 2000-206f General Punctuation (Limited to Quotes)
generate 2018 201F
# 20a0-20cf Currency Symbols (Limited to Euro symbol)
generate 20ac 20ac