--[[ Copyright (c) 2010 Manuel "Roujin" Wolf

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. --]]

-- Creates a dat and palette file from a single BMP image to be used in Graphics:loadRaw(...)
-- file: the target BMP image
-- Output goes to the same location of the BMP image
function makeRaw(file)
  if not file then
    print "Usage: lua mkraw.lua <bitmap-file>"
    print "Converts a bitmap into a raw .dat file and a .pal file"
    return
  end

  package.path = (debug.getinfo(1, "S").source:match("@(.*[" .. package.config
                 :sub(1, 1) .. "])") or "") .. "lib_" .. package.config:sub(5, 5)
                 .. ".lua" .. package.config:sub(3, 3) .. package.path
  local bmp = require("lib_bmp")

  local filename = file
  if not filename:match("%.bmp$") then
    print("Error: Extension must must be .bmp")
    return
  end
  local filename_base = filename:match"^(.*%.)[^.]*$"
  local dat, pal = filename_base .."dat", filename_base .. "pal"
  local bitmap = assert(bmp.open(filename))
  dat = assert(io.open(dat, "wb"))
  pal = assert(io.open(pal, "wb"))

  -- palette
  pal:write(bitmap.palette)
  pal:close()

  -- image data
  dat:write(assert(bmp.getPixels(bitmap)))
  dat:close()

  if bitmap.pal_size ~= 256 then
    print("Warning: palette size is " .. bitmap.pal_size .. ". Currently only palettes of size 256 will work in CorsixTH.")
  end
end
