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Seperate signs API from signs definitions

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Change modnames from *_lib to *_api
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# Font Lib API
This document describes Font Lib API. Font Lib 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.
## Provided methods
### get\_text\_size
**font\_lib.get\_text\_size(font\_name, text)**
Computes size for a given font and text
**font\_name**: Font name of registered font to use
**text**: Text to be rendered
**Returns**: rendered text width, height
### make\_line\_texture
**font\_lib.make\_line\_texture(font\_name, text, width, x, y)**
Builds texture part for a text line
**font\_name**: Font name of registered font to use
**text**: Text to be rendered
**texturew**: Width of the texture (extra text is not rendered)
**x**: Starting x position in texture
**y**: Vertical position of the line in texture
**Returns**: Texture string
### make\_multiline\_texture
**font\_lib.make\_multiline\_texture(font\_name, text, width, height, maxlines, halign, valign, color)**
Builds texture for a multiline colored text
**font\_name**: Font name of registered font to use
**text**: Text to be rendered
**texturew**: Width of the texture (extra text will be truncated)
**textureh**: Height of the texture
**maxlines**: Maximum number of lines
**halign**: Horizontal text align ("left", "right" or "center") (optional)
**valign**: Vertical text align ("top", "bottom" or "center") (optional)
**color**: Color of the text (optional)
**Returns**: Texture string
### register\_font
**font\_lib.register_font(font\_name, height, widths)**
Registers a new font in font_api.
**font\_name**: Name of the font to register (this name will be used to address the font later)
If registering different sizes of the same font, add size in the font name (e.g. times\_10, times\_12...).
**height**: Font height in pixels (all font textures should have the same height)
**widths** : Array of character widths in pixels, indexed by UTF codepoints
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
To ease that declaration, 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

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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
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
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As used herein, "this License" refers to version 3 of the GNU Lesser
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# Font Lib
This library for font display on entities (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.

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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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--[[
font_api mod for Minetest - Library to add font display capability
to display_api mod.
(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)
font_api.registered_fonts = {}
-- Local variables
------------------
local default_font = false
-- Local functions
------------------
-- Split multiline text into array of lines, with <maxlines> maximum lines.
local function split_lines(text, maxlines)
local splits = text:split("\n")
if maxlines then
local lines = {}
for num = 1,maxlines do
lines[num] = splits[num]
end
return lines
else
return splits
end
end
-- 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
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 properties to be used according to font_name
local function 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
-- Returns next char, managing ascii and unicode plane 0 (0000-FFFF).
local function get_next_char(text, pos)
local msb = text:byte(pos)
-- 1 byte char, ascii equivalent codepoints
if msb < 0x80 then
return msb, pos + 1
end
-- 4 bytes char not managed (Only 16 bits codepoints are managed)
if msb >= 0xF0 then
return 0, pos + 4
end
-- 3 bytes char
if msb >= 0xE0 then
return (msb - 0xE0) * 0x1000
+ text:byte(pos + 1) % 0x40 * 0x40
+ text:byte(pos + 2) % 0x40,
pos + 3
end
-- 2 bytes char (little endian)
if msb >= 0xC2 then
return (msb - 0xC2) * 0x40 + text:byte(pos + 1),
pos + 2
end
-- Not an UTF char
return 0, pos + 1
end
-- API functions
----------------
-- Computes text size for a given font and text (ignores new lines)
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @return Rendered text (width, height)
function font_api.get_text_size(font_name, text)
local char
local width = 0
local pos = 1
local font = get_font(font_name)
if font == nil then
return 0, 0
else
while pos <= #text do
char, pos = get_next_char(text, pos)
-- Replace chars with no texture by the NULL(0) char
if font.widths[char] ~= nil then
width = width + font.widths[char]
else
width = width + font.widths[0]
end
end
end
return width, font.height
end
--- Builds texture part for a text line
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @param width Width of the texture (extra text is not rendered)
-- @param x Starting x position in texture
-- @param y Vertical position of the line in texture
-- @return Texture string
function font_api.make_line_texture(font_name, text, width, x, y)
local texture = ""
local char
local pos = 1
local font = get_font(font_name)
if font ~= nil then
while pos <= #text do
char, pos = get_next_char(text, pos)
-- Replace chars with no texture by the NULL(0) char
if font.widths[char] == nil then
print(string.format("["..font_api.name
.."] Missing char %d (%04x)",char,char))
char = 0
end
-- Add image only if it is visible (at least partly)
if x + font.widths[char] >= 0 and x <= width then
texture = texture..
string.format(":%d,%d=font_%s_%04x.png",
x, y, font.name, char)
end
x = x + font.widths[char]
end
end
return texture
end
--- Builds texture for a multiline colored text
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @param texturew Width of the texture (extra text will be truncated)
-- @param textureh Height of the texture
-- @param maxlines Maximum number of lines
-- @param halign Horizontal text align ("left"/"center"/"right") (optional)
-- @param valign Vertical text align ("top"/"center"/"bottom") (optional)
-- @param color Color of the text (optional)
-- @return Texture string
function font_api.make_multiline_texture(font_name, text, width, height,
maxlines, halign, valign, color)
local texture = ""
local lines = {}
local textheight = 0
local y, w, h
for num, line in pairs(split_lines(text, maxlines)) do
w, h = font_api.get_text_size(font_name, line)
lines[num] = { text = line, width = w, height = h, }
textheight = textheight + h
end
if #lines then
if valign == "top" then
y = 0
elseif valign == "bottom" then
y = height - textheight
else
y = (height - textheight) / 2
end
end
for _, line in pairs(lines) do
if halign == "left" then
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
0, y)
elseif halign == "right" then
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
width - line.width, y)
else
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
(width - line.width) / 2, y)
end
y = y + line.height
end
texture = string.format("[combine:%dx%d", width, height)..texture
if color then texture = texture.."^[colorize:"..color end
return texture
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 height Font height in pixels
-- @param widths Array of character widths in pixels, indexed by UTF codepoints
function font_api.register_font(font_name, height, widths)
if font_api.registered_fonts[font_name] ~= nil then
minetest.log("error", "Font \""..font_name.."\" already registered.")
return
end
if height == nil or height <= 0 then
minetest.log("error", "Font \""..font_name..
"\" must have a positive height.")
return
end
if type(widths) ~= "table" then
minetest.log("error", "Font \""..font_name..
"\" must have a widths array.")
return
end
if widths[0] == nil then
minetest.log("error", "Font \""..font_name..
"\" must have a char with codepoint 0 (=unknown char).")
return
end
font_api.registered_fonts[font_name] =
{ name = font_name, height = height, widths = widths }
-- Force to choose again default font
-- (allows use of fonts registered after start)
default_font = false
end
--- Standard on_display_update entity callback.
-- Node should have a corresponding display_entity with size, resolution and
-- maxlines fields and optionally halign, valign and color fields
-- @param pos Node position
-- @param objref Object reference of entity
function font_api.on_display_update(pos, objref)
local meta = minetest.get_meta(pos)
local text = meta:get_string("display_text")
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
local entity = objref:get_luaentity()
if entity and ndef.display_entities[entity.name] then
local def = ndef.display_entities[entity.name]
local font = get_font(def.font_name)
objref:set_properties({
textures={font_api.make_multiline_texture(
def.font_name, text,
def.size.x * def.resolution.x * font.height,
def.size.y * def.resolution.y * font.height,
def.maxlines, def.halign, def.valign, def.color)},
visual_size = def.size
})
end
end
-- Compatibility
font_lib = font_api

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default_font(Default font) string

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#!/bin/bash
scriptname=$(basename $0)
identify="identify"
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',
$font_height,
{ $font_widths }
);
" > font_$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