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--[[
Note on copyright:
The Unifont website (http://unifoundry.com/unifont/index.html) says that
the font files are licensed "under the GNU General Public License,
either version 2 or (at your option) a later version". Section 13 of the
GNU GPLv3 gives the "permission to link or combine any covered work with
a work licensed under version 3 of the GNU Affero General Public License
into a single combined work". The use of Unifont here should fall under
this case considering that
- Unifont is licensed under GNU GPLv2+, and, in this case, the terms of
the GNU GPLv3 is used here
- We are combining Unifont into advtrains, and the latter is licensed
under the GNU AGPLv3.
However, as I am not a lawyer, I can not be sure whether this
interpretation is legally accepted.
- Y.W.
]]
local tonumber, unpack = tonumber, unpack
local sbyte, schar, sformat, smatch, ssub = string.byte, string.char, string.format, string.match, string.sub
local tconcat = table.concat
local texture_dir = tconcat({advtrains.modpath, "textures", "unifont"}, DIR_DELIM)
minetest.mkdir(texture_dir)
local function texture_file(cp)
return sformat(cp < 65536 and "%s_%04x.bmp" or "%s_%06x.bmp", "advtrains_unifont", cp)
end
local function texture_path(cp)
return texture_dir .. DIR_DELIM .. texture_file(cp)
end
local cpwidth = {}
local function mbstocps(str)
local t = {}
local i = 1
while i <= #str do
local c = sbyte(str, i)
local bt = {}
i = i+1
if c < 128 then
-- nop
elseif c < 192 then
c = 0
elseif c < 224 then
bt = {sbyte(str, i, i)}
elseif c < 240 then
bt = {sbyte(str, i, i+1)}
elseif c < 248 then
bt = {sbyte(str, i, i+2)}
else
c = 0
end
for i = 1, #bt do
c = c*64+(bt[i]%64)
end
i = i + #bt
t[#t+1] = c
end
return t
end
local function renderer(opts)
local opts = opts or {}
local x0, y0 = (opts.x or 0), (opts.y or 0)
local width, height = opts.width, opts.height
local halign, valign = (opts.halign or 0.5), (opts.valign or 0.5)
local textcolor = opts.textcolor or "black"
local bgcolor = opts.bgcolor
local function break_lines(cps)
local lastline = {width = 0}
local lines = {lastline}
local i = 1
while i <= #cps do
local char = cps[i]
if char == 10 then
lastline = {width = 0}
lines[#lines+1] = lastline
elseif cpwidth[char] then
lastline.width = lastline.width + cpwidth[char]
lastline[#lastline+1] = char
end
i = i+1
end
return lines
end
return function(str)
local lines = break_lines(mbstocps(str))
local textheight = 16*#lines
local y = y0 + (height-textheight)*valign
local st = {
"[combine",
sformat("%dx%d", x0+width, y0+height)
}
for i = 1, #lines do
local line = lines[i]
local x = x0 + (width - line.width)*halign
for j = 1, #line do
local cp = line[j]
st[#st+1] = sformat("%d,%d=%s", x, y, texture_file(cp))
x = x + cpwidth[cp]
end
end
local prefix = ""
if bgcolor then
prefix = sformat("[combine:%dx%d:%d,%d=\\(advtrains_hud_bg.png\\^[resize\\:%dx%d\\^[colorize\\:%s\\:alpha\\)^",
x0+width, y0+height, x0, y0, width, height, bgcolor)
end
return sformat("(%s(%s^[makealpha:000000^[multiply:%s))", prefix, tconcat(st, ":"), textcolor)
end
end
local function render(str, opts)
return renderer(opts)(str)
end
-- Generate texture files
local bmp_headers = {}
for _, v in pairs {8, 16} do
bmp_headers[v] = tconcat{
"BM", -- starting bytes
"\125\0\0\0", -- file size
"\0\0\0\0", -- reserved fields
"\62\0\0\0", -- offset of the pixel array
"\40\0\0\0", -- BITMAPINFOHEADER
schar(v, 0, 0, 0), -- image width
"\16\0\0\0", -- image height
"\1\0", -- number of color planes (must be 1, apparently)
"\1\0", -- bits per pixel
"\0\0\0\0", -- no compression
"\64\0\0\0", -- size of the raw bitmap data
"\0\0\0\0\0\0\0\0", -- image resolution (irrelevant here)
"\2\0\0\0", -- number of colors in the palette
"\0\0\0\0", -- "important" colors
-- palette
"\0\0\0\0",
"\255\255\255\0",
}
end
local t0 = os.clock()
local f = io.open(advtrains.modpath .. DIR_DELIM .. "unifont.hex", "rb") or error("Cannot open unifont.hex")
for l in f:lines() do
local cp, raw = smatch(l, "^(%x+):(%x+)$")
local cp = tonumber(cp, 16) or error("Cannot parse codepoint from " .. cp)
local rowsize = #raw/16
local width = rowsize*4
cpwidth[cp] = width
local rowbytes = rowsize/2
local bytes = {bmp_headers[width]}
for i = 0, 15 do
local row = {}
local offset = i*rowsize
for j = 1, rowbytes do
local offset = offset+2*j-1
local data = ssub(raw, offset, offset+1)
row[j] = tonumber(data, 16)
end
for j = rowbytes+1, 4 do
row[j] = 0
end
bytes[17-i] = schar(unpack(row))
end
minetest.safe_file_write(texture_path(cp), tconcat(bytes))
end
minetest.log("action",sformat("[advtrains/unifont] Generated textures in %f seconds", os.clock()-t0))
return {
texture_dir = texture_dir,
renderer = renderer,
render = render
}
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