------------------------------------------------------------------------------
-- Image class 
------------------------------------------------------------------------------
local ctrl = {
  nick = "image",
  parent = iup.WIDGET,
  subdir = "elem",
  creation = "nns", -- fake definition
  callback = {},
  createfunc = [[ 
static int Image (lua_State * L)
{
  int w, h, c, num_colors;
  unsigned char *pixels;
  Ihandle* ih;
  char str[20];

  if (lua_istable(L, 1))
  {
    int i, j;

    /* get the number of lines */
    h = iuplua_getn(L, 1);  

    /* get the number of columns of the first line */
    lua_pushinteger(L, 1);
    lua_gettable(L, 1);
    w = iuplua_getn(L, -1);  
    lua_pop(L, 1);
    
    pixels = (unsigned char *) malloc (h*w);

    for (i=1; i<=h; i++)
    {
      lua_pushinteger(L, i);
      lua_gettable(L, 1);
      for (j=1; j<=w; j++)
      {
        int idx = (i-1)*w+(j-1);
        lua_pushinteger(L, j);
        lua_gettable(L, -2);
        pixels[idx] = (unsigned char)lua_tointeger(L, -1);
        lua_pop(L, 1);
      }
      lua_pop(L, 1);
    }
    
    ih = IupImage(w,h,pixels);  
    free(pixels);

    num_colors = iuplua_getn(L, 2);
    num_colors = num_colors>255? 255: num_colors;
    for(c=1; c<=num_colors; c++)
    {
      lua_rawgeti(L, 2, c);
      sprintf(str, "%d", c);
      IupStoreAttribute(ih, str, lua_tostring(L,-1));
      lua_pop(L, 1);
    }
  }
  else
  {
    w = (int)luaL_checkinteger(L, 1);
    h = (int)luaL_checkinteger(L, 2);
    pixels = iuplua_checkuchar_array(L, 3, w*h);
    ih = IupImage(w, h, pixels);
    free(pixels);

    num_colors = iuplua_getn(L, 4);
    num_colors = num_colors>256? 256: num_colors;
    for(c=1; c<=num_colors; c++)
    {
      lua_rawgeti(L, 4, c);
      sprintf(str, "%d", c-1);
      IupStoreAttribute(ih, str, lua_tostring(L,-1));
      lua_pop(L, 1);
    }
  }

  iuplua_plugstate(L, ih);
  iuplua_pushihandle_raw(L, ih);
  return 1;
} 
 
]]
}

function ctrl.createElement(class, param)
   if (param.width and param.height and param.pixels) then
     return iup.Image(param.width, param.height, param.pixels, param.colors)
   else
     return iup.Image(param, param.colors)
   end
end

iup.RegisterWidget(ctrl)
iup.SetClass(ctrl, "iupWidget")