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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.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
|
