diff options
Diffstat (limited to 'font_api/font.lua')
| -rw-r--r-- | font_api/font.lua | 180 |
1 files changed, 86 insertions, 94 deletions
diff --git a/font_api/font.lua b/font_api/font.lua index a69e049..5794867 100644 --- a/font_api/font.lua +++ b/font_api/font.lua @@ -1,20 +1,19 @@ --[[ - 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/>. + 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 @@ -39,14 +38,15 @@ local function char_to_codepoint(str) local bytes = get_char_bytes(str) if bytes == 1 then return str:byte(1) - elseif bytes == 2 then + elseif bytes == 2 and str:byte(2) ~= nil then return (str:byte(1) - 0xC2) * 0x40 + str:byte(2) - elseif bytes == 3 then + 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 then -- Not tested + 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 @@ -54,20 +54,6 @@ local function char_to_codepoint(str) end end --- Split multiline text into array of lines, with <maxlines> maximum lines. --- Can not use minetest string.split as it has bug if first line(s) empty -local function split_lines(text, maxlines) - local lines = {} - local pos = 1 - repeat - local found = string.find(text, "\n", pos) - found = found or #text + 1 - lines[#lines + 1] = string.sub(text, pos, found - 1) - pos = found + 1 - until (maxlines and (#lines >= maxlines)) or (pos > (#text + 1)) - return lines -end - -------------------------------------------------------------------------------- --- Font class @@ -131,6 +117,12 @@ function Font:get_next_char(text) 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) @@ -189,94 +181,94 @@ function Font:get_width(line) 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 ---- Builds texture part for a text line --- @param line Text line to be rendered --- @param texturew 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 +--- Legacy make_text_texture method (replaced by "render" - Dec 2018) -function Font:make_line_texture(line, texturew, x, y) - local codepoint - local texture = "" - line = line or '' - - while line ~= '' do - codepoint, line = self:get_next_char(line) - - -- Add image only if it is visible (at least partly) - if x + self:get_char_width(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:get_char_width(codepoint) - end - - return texture +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 ---- Builds texture for a multiline colored text +--- Render text with the font in a view -- @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) +-- @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:make_text_texture(text, texturew, textureh, maxlines, - halign, valign, color) - local texture = "" +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 textheight = 0 - local y + 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)) - -- Split text into lines (limited to maxlines fist lines) - for num, line in pairs(split_lines(text, maxlines)) do - lines[num] = { text = line, width = self:get_width(line) } + if not #lines then + return "" end - textheight = self:get_height(#lines) + local x, y, codepoint + local texture = "" + local textheight = self:get_height(#lines) - if #lines then - if valign == "top" then - y = 0 - elseif valign == "bottom" then - y = textureh - textheight - else - y = (textureh - textheight) / 2 - end + 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 halign == "left" then - texture = texture.. - self:make_line_texture(line.text, texturew, - 0, y) - elseif halign == "right" then - texture = texture.. - self:make_line_texture(line.text, texturew, - texturew - line.width, y) + if style.halign == "left" then + x = 0 + elseif style.halign == "right" then + x = texturew - line.width else - texture = texture.. - self:make_line_texture(line.text, texturew, - (texturew - line.width) / 2, y) + 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 color then texture = texture.."^[colorize:"..color end + if style.color then + texture = texture.."^[colorize:"..style.color + end return texture end |