Extensions/watermark.py

   1 # -*- coding: utf-8 -*-
   2 ############################################################
   3 # Copyright © 2005-2008  Benoît PIN <benoit.pin@ensmp.fr>  #
   4 # Plinn - http://plinn.org                                 #
   5 #                                                          #
   6 # This program is free software; you can redistribute it   #
   7 # and/or modify it under the terms of the Creative Commons #
   8 # "Attribution-Noncommercial 2.0 Generic"                  #
   9 # http://creativecommons.org/licenses/by-nc/2.0/           #
  10 ############################################################
  11 """
  12 $Id: watermark.py 622 2008-11-16 23:38:18Z pin $
  13 $URL: http://svn.luxia.fr/svn/labo/projects/zope/Portfolio/trunk/Extensions/watermark.py $
  14 """
  15
  16 from Globals import package_home
  17 from os import path
  18 from PIL.Image import open as imgopen
  19 from ImageDraw import Draw
  20 from PIL.ImageDraw import Draw
  21 from PIL.ImageFont import truetype
  22 from Products.Portfolio.Extensions import fontdir
  23 from Products.Photo.cache import memoizedmethod
  24
  25 class FontCache:
  26         def __init__(self) :
  27                 self._methodResultsCache = {}
  28
  29         @memoizedmethod('name', 'size', 'index')
  30         def get(self, name, size, index) :
  31                 fontfile = path.join(fontdir, name)
  32                 font = truetype(fontfile, size, index=index)
  33                 return font
  34
  35
  36 fontCache = FontCache()
  37
  38
  39 def addWatermark(self, image, text, size=20, margin_right=10, margin_bottom=10, font='verdana.ttf', index=0, encoding='utf-8') :
  40
  41         font = fontCache.get(font, size, index)
  42         text = text.decode(encoding)
  43         tw, th = font.getsize(text)
  44         iw, ih = image.size
  45
  46         d = Draw(image)
  47
  48         left, top = (iw - tw - margin_right, ih - th - margin_bottom)
  49
  50         d.text((left, top), text, font = font)