icon.py :  » Installer » Zero-Install » zeroinstall-injector-0.47 » zeroinstall » gtkui » Python Open Source

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Python Open Source » Installer » Zero Install 
Zero Install » zeroinstall injector 0.47 » zeroinstall » gtkui » icon.py
"""Loading icons."""
# Copyright (C) 2009, Thomas Leonard
# See the README file for details, or visit http://0install.net.

from zeroinstall import _
import gtk
from logging import warn,debug

def load_icon(icon_path, icon_width=None, icon_height=None):
  """Load icon from path. Icon MUST be in PNG format.
  @param icon_path: pathname of icon, or None to load nothing
  @return: a GdkPixbuf, or None on failure"""
  if not icon_path:
    return None

  def size_prepared_cb(loader, width, height):
    dest_width = icon_width or width
    dest_height = icon_height or height

    if dest_width == width and dest_height == height:
      return

    ratio_width = float(dest_width) / width
    ratio_height = float(dest_height) / height
    ratio = min(ratio_width, ratio_height)

    # preserve original ration
    if ratio_width != ratio:
      dest_width = int(math.ceil(width * ratio))
    elif ratio_height != ratio:
      dest_height = int(math.ceil(height * ratio))

    loader.set_size(int(dest_width), int(dest_height))

  # Restrict icon formats to avoid attacks
  for format in ('png', 'svg'):
    try:
      loader = gtk.gdk.PixbufLoader(format)
      if icon_width or icon_height:
        loader.connect('size-prepared', size_prepared_cb)
      try:
        loader.write(file(icon_path).read())
      finally:
        loader.close()
      return loader.get_pixbuf()
    except Exception, ex:
      debug(_("Failed to load icon: %s") % ex)

  warn(_("Failed to load cached icon"))
  return None
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