lib/gears/surface.lua.in

   1 ---------------------------------------------------------------------------
   2 -- @author Uli Schlachter
   3 -- @copyright 2012 Uli Schlachter
   4 -- @release @AWESOME_VERSION@
   5 ---------------------------------------------------------------------------
   6
   7 local setmetatable = setmetatable
   8 local type = type
   9 local capi = { awesome = awesome }
  10 local cairo = require("lgi").cairo
  11
  12 -- This checks for '<= 0.5' because there are git versions after 0.6 which still
  13 -- identify themselves as 0.6 but already have the needed cairo support
  14 local ver_major,ver_minor = string.match(require('lgi.version'),'(%d)%.(%d)')
  15 if ( (tonumber(ver_major)<=0) and (tonumber(ver_minor)<=5) ) then
  16     error("lgi too old, need at least version 0.6.1")
  17 end
  18
  19 -- gears.surface
  20 local surface = { mt = {} }
  21
  22 --- Try to convert the argument into an lgi cairo surface.
  23 -- This is usually needed for loading images by file name.
  24 function surface.load(_surface)
  25     -- Nil is not changed
  26     if not _surface then
  27         return nil
  28     end
  29     -- lgi cairo surfaces don't get changed either
  30     if cairo.Surface:is_type_of(_surface) then
  31         return _surface
  32     end
  33     -- Strings are assumed to be file names and get loaded
  34     if type(_surface) == "string" then
  35         _surface = capi.awesome.load_image(_surface)
  36     end
  37     -- Everything else gets forced into a surface
  38     return cairo.Surface(_surface, true)
  39 end
  40
  41 function surface.mt:__call(...)
  42     return surface.load(...)
  43 end
  44
  45 return setmetatable(surface, surface.mt)
  46
  47 -- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80