bin/SpiffGtkWidgets/color.py

   1 # Copyright (C) 2008 Samuel Abels, http://debain.org
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License version 2, as
   5 # published by the Free Software Foundation.
   6 #
   7 # This program is distributed in the hope that it will be useful,
   8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 # GNU General Public License for more details.
  11 #
  12 # You should have received a copy of the GNU General Public License
  13 # along with this program; if not, write to the Free Software
  14 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15 import gtk.gdk
  16
  17 ########################
  18 # Explicit converters.
  19 ########################
  20 def str2gdk(name):
  21     return gtk.gdk.color_parse(name)
  22
  23 def int2gdk(i):
  24     red   = (i >> 24) & 0xff
  25     green = (i >> 16) & 0xff
  26     blue  = (i >>  8) & 0xff
  27     return gtk.gdk.Color(red * 256, green * 256, blue * 256)
  28
  29 def rgb2gdk(color):
  30     red   = color[0] * 65535.0
  31     green = color[1] * 65535.0
  32     blue  = color[2] * 65535.0
  33     return gtk.gdk.Color(red, green, blue)
  34
  35 def rgba2gdk(color):
  36     red   = color[0] * 65535.0
  37     green = color[1] * 65535.0
  38     blue  = color[2] * 65535.0
  39     value = color[3] * 65535.0 # not supported by gdk.Color
  40     return gtk.gdk.Color(red, green, blue)
  41
  42 def gdk2int(color):
  43     return (color.red   / 256 << 24) \
  44          | (color.green / 256 << 16) \
  45          | (color.blue  / 256 <<  8) \
  46          | 0xff
  47
  48 def gdk2rgb(color):
  49     return (color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0)
  50
  51 def gdk2rgba(color):
  52     return (color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0, 1)
  53
  54 ########################
  55 # Automatic converters.
  56 ########################
  57 def to_gdk(color):
  58     if isinstance(color, gtk.gdk.Color):
  59         return color
  60     elif type(color) == type(0) or type(color) == type(0l):
  61         return int2gdk(color)
  62     elif type(color) == type(''):
  63         return str2gdk(color)
  64     elif type(color) == type(()) and len(color) == 3:
  65         return rgb2gdk(color)
  66     elif type(color) == type(()) and len(color) == 4:
  67         return rgba2gdk(color)
  68     else:
  69         raise TypeError('%s is not a known color type' % type(color))
  70
  71 def to_int(color):
  72     return gdk2int(to_gdk(color))
  73
  74 def to_rgb(color):
  75     return gdk2rgb(to_gdk(color))
  76
  77 def to_rgba(color):
  78     return gdk2rgba(to_gdk(color))