hex2bdf

#!/usr/local/bin/lua-5.1

-- Copyright (c) 2013-2014 The FreeBSD Foundation
-- All rights reserved.
--
-- This software was developed by Ed Maste under sponsorship from
-- The FreeBSD Foundation.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
--
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.

-- Convert from hex format fonts to BDF

-- Default to 8x16 if unspecified
char_width = 8
char_height = 16

function calculate_char_vals()
    char_width_bytes = math.ceil(char_width / 8)
    char_width_bits = char_width_bytes * 8
    char_bytes = char_width_bytes * char_height
end

function set_width(line, match)
    char_width = match[1]
    calculate_char_vals()
    return true
end

function set_height(line, match)
    char_height = match[1]
    calculate_char_vals()
    return true
end

chars = {}
glyph = {}
function read_char(line, match)
    c = tonumber(match[1], 16)
    table.insert(chars, c)
    glyph[c] = match[2]
end

function output_char(codepoint, hex)
    local per_row = hex:len() / char_height
    local double = per_row / 2 / char_width_bytes
    io.write(string.format([[STARTCHAR U+%04X
ENCODING %d
SWIDTH %d 0
DWIDTH %d 0
BBX %d %d 0 -2
BITMAP
]],
      codepoint,
      codepoint,
      500 * double,
      char_width * double,
      char_width * double,
      char_height))
    for i = 1, char_height do
        io.write(string.format("%s\n", hex:sub(1, per_row)))
        hex = hex:sub(per_row + 1)
    end
    io.write("ENDCHAR\n")
end

expressions = {
    ["# Width: (%d+)"] = set_width,
    ["# Height: (%d+)"] = set_height,
    ["(%x+):(%x+)"] = read_char,
}

calculate_char_vals()

for line in io.lines(arg[1]) do
    for exp,fn in pairs(expressions) do
        match = {line:match(exp)}
        if next(match) ~= nil and fn(line, match) then
            break
        end
    end
end

io.write(string.format([[STARTFONT 2.1
FONT -freebsd-misc-medium-r-normal--16-160-75-75-c-80-iso10646-1
SIZE 16 75 75
FONTBOUNDINGBOX %d %d 0 -2
STARTPROPERTIES 3
FONT_ASCENT %d
FONT_DESCENT 2
DEFAULT_CHAR 32
ENDPROPERTIES
]], char_width * 2, char_height, char_height - 2))
io.write(string.format("CHARS %d\n", #chars))

for i,codepoint in ipairs(chars) do
    output_char(codepoint, glyph[codepoint])
end

io.write("ENDFONT\n")