diff options
Diffstat (limited to 'font_api/init.lua')
| -rw-r--r-- | font_api/init.lua | 295 |
1 files changed, 6 insertions, 289 deletions
diff --git a/font_api/init.lua b/font_api/init.lua index f407f8b..2dc38ec 100644 --- a/font_api/init.lua +++ b/font_api/init.lua @@ -23,293 +23,12 @@ font_api = {} font_api.name = minetest.get_current_modname() font_api.path = minetest.get_modpath(font_api.name) -font_api.registered_fonts = {} --- Local variables ------------------- +-- Inclusions +------------- -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 +dofile(font_api.path.."/font.lua") +dofile(font_api.path.."/registry.lua") --- Standard on_display_update entity callback. -- Node should have a corresponding display_entity with size, resolution and @@ -325,11 +44,9 @@ function font_api.on_display_update(pos, objref) if entity and ndef.display_entities[entity.name] then local def = ndef.display_entities[entity.name] - local font = get_font(def.font_name) - + local font = font_api.get_font(meta:get_string("font") or def.font_name) objref:set_properties({ - textures={font_api.make_multiline_texture( - def.font_name, text, + textures={font:make_text_texture(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)}, |