Seperate signs API from signs definitions

Change modnames from *_lib to *_api

API.md

@@ -0,0 +1,110 @@
+# 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
+
+
+
+
+

LICENSE.txt

@@ -0,0 +1,166 @@
+                   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.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
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+

README.md

@@ -0,0 +1,14 @@
+# 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.
+

copyright.txt

@@ -0,0 +1,3 @@
+Code by Pierre-Yves Rollo (pyrollo)
+Contributors:
+Andrzej Pieńkowski (apienk): Unicode support and tool for creating texturess

init.lua

@@ -0,0 +1,343 @@
+--[[
+    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
+

settingtypes.txt

@@ -0,0 +1 @@
+default_font(Default font) string

tools/make_font_lua.sh

@@ -0,0 +1,56 @@
+#!/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
+

tools/make_font_textures.sh

@@ -0,0 +1,111 @@
+#!/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
+
+