Re: Writing an image format

here is a reader for you

-- vim:set sw=4 ts=4:
--
-- This Lua script reads texture data from a .ppm file.
--
-- Copyright (C) 2009 Pim Goossens
--
-- 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 2 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/>, or write
-- to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-- Boston, MA 02110-1301 USA.

local f = io.open(..., 'rb')
if not f then
error('error while opening file ' .. (...))
end
-- Read the header
local magic = f:read()
if not magic == 'P6' then
error('not a PPM file')
end
local width, height, maxval = f:read("*n", "*n", "*n")
if not maxval == 255 then
error('expected maxval of 255')
end
-- Skip the single whitespace character following the maxval
f:read(1)
-- Now read the image data
data = "" * height * 3)
if #data < width * height * 3 then
error('insufficient data')
end
f:close()

return {
width = width;
height = height;
flags = 0;
data = "">}

On Tue, Oct 26, 2010 at 6:22 PM, Gabriel Duarte <confusosk8@gmail.com> wrote:

If you want, I got a code that handle a buffer and writes it into a .ppm file...

On Tue, Oct 26, 2010 at 8:20 PM, Daniel Aquino <mr.danielaquino@gmail.com> wrote:

Yea ppm is a simple option.

On Tue, Oct 26, 2010 at 6:19 PM, Gabriel Duarte <confusosk8@gmail.com> wrote:

Or write a .ppm file, only a header and after, just the RGB values :P

On Tue, Oct 26, 2010 at 8:05 PM, Patrick Mc(avery <spell_gooder_now@spellingbeewinnars.org> wrote:

Hi Mike

What about a .xpm file?

http://en.wikipedia.org/wiki/X_PixMap

They are bitmaps from text. You could always convert it to a .png later.

-Patrick

--
Gabriel Duarte
Linux User #471185
Rio de Janeiro - RJ
http://w3.impa.br/~gabrield

Phones:
(55) (21) 9463-7760 -> Mobile
(55) (21) 2464-9302 -> Home
(55) (21) 2529-5080 -> Work

--
Gabriel Duarte
Linux User #471185
Rio de Janeiro - RJ
http://w3.impa.br/~gabrield

Phones:
(55) (21) 9463-7760 -> Mobile
(55) (21) 2464-9302 -> Home
(55) (21) 2529-5080 -> Work