diff options
Diffstat (limited to 'font_api/font.lua')
| -rw-r--r-- | font_api/font.lua | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/font_api/font.lua b/font_api/font.lua deleted file mode 100644 index 5794867..0000000 --- a/font_api/font.lua +++ /dev/null @@ -1,274 +0,0 @@ ---[[ - 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 |