298 lines
10 KiB
Python
298 lines
10 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2000-2007 Donald N. Allingham
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Handles generation and access to thumbnails used in GRAMPS.
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"""
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#-------------------------------------------------------------------------
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#
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# Standard python modules
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#
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#-------------------------------------------------------------------------
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import os
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import md5
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#-------------------------------------------------------------------------
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#
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# GTK/Gnome modules
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#
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#-------------------------------------------------------------------------
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import gtk
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import gobject
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#-------------------------------------------------------------------------
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#
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# gramps modules
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#
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#-------------------------------------------------------------------------
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import const
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import Mime
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#-------------------------------------------------------------------------
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#
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# gconf - try loading gconf for GNOME based systems. If we find it, we
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# might be able to generate thumbnails for non-image files.
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#
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#-------------------------------------------------------------------------
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try:
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import gconf
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GCONF = True
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CLIENT = gconf.client_get_default()
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except ImportError:
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GCONF = False
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#-------------------------------------------------------------------------
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#
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# __get_gconf_string
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#
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#-------------------------------------------------------------------------
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def __get_gconf_string(key):
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"""
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Attempt to retrieve a value from the GNOME gconf database based of the
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passed key.
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@param key: GCONF key
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@type key: unicode
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@returns: Value associated with the GCONF key
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@rtype: unicode
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"""
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try:
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val = CLIENT.get_string(key)
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except gobject.GError:
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val = None
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return unicode(val)
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#-------------------------------------------------------------------------
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#
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# __get_gconf_bool
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#
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#-------------------------------------------------------------------------
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def __get_gconf_bool(key):
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"""
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Attempt to retrieve a value from the GNOME gconf database based of the
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passed key.
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@param key: GCONF key
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@type key: unicode
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@returns: Value associated with the GCONF key
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@rtype: bool
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"""
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try:
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val = CLIENT.get_bool(key)
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except gobject.GError:
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val = None
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return val
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#-------------------------------------------------------------------------
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#
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# __build_thumb_path
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#
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#-------------------------------------------------------------------------
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def __build_thumb_path(path, rectangle=None):
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"""
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Convert the specified path into a corresponding path for the thumbnail
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image. We do this by converting the original path into an MD5SUM value
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(which should be unique), adding the '.png' extension, and prepending
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with the GRAMPS thumbnail directory.
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@type path: unicode
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@param path: filename of the source file
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@type rectangle: tuple
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@param rectangle: subsection rectangle
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@rtype: unicode
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@returns: full path name to the corresponding thumbnail file.
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"""
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extra = ""
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if rectangle is not None:
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extra = "?" + str(rectangle)
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md5_hash = md5.md5(path+extra)
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return os.path.join(const.THUMB_DIR, md5_hash.hexdigest()+'.png')
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#-------------------------------------------------------------------------
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#
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# __create_thumbnail_image
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#
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#-------------------------------------------------------------------------
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def __create_thumbnail_image(src_file, mtype=None, rectangle=None):
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"""
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Generates the thumbnail image for a file. If the mime type is specified,
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and is not an 'image', then we attempt to find and run a thumbnailer
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utility to create a thumbnail. For images, we simply create a smaller
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image, scaled to thumbnail size.
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@param src_file: filename of the source file
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@type src_file: unicode
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@param mtype: mime type of the specified file (optional)
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@type mtype: unicode
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@param rectangle: subsection rectangle
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@type rectangle: tuple
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"""
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filename = __build_thumb_path(src_file, rectangle)
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if mtype and not mtype.startswith('image/'):
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# Not an image, so run the thumbnailer
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run_thumbnailer(mtype, src_file, filename)
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else:
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# build a thumbnail by scaling the image using GTK's built in
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# routines.
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try:
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pixbuf = gtk.gdk.pixbuf_new_from_file(src_file)
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width = pixbuf.get_width()
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height = pixbuf.get_height()
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if rectangle is not None:
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upper_x = min(rectangle[0], rectangle[2])/100.
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lower_x = max(rectangle[0], rectangle[2])/100.
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upper_y = min(rectangle[1], rectangle[3])/100.
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lower_y = max(rectangle[1], rectangle[3])/100.
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sub_x = int(upper_x * width)
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sub_y = int(upper_y * height)
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sub_width = int((lower_x - upper_x) * width)
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sub_height = int((lower_y - upper_y) * height)
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if sub_width > 0 and sub_height > 0:
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pixbuf = pixbuf.subpixbuf(sub_x, sub_y, sub_width, sub_height)
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width = sub_width
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height = sub_height
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scale = const.THUMBSCALE / (float(max(width, height)))
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scaled_width = int(width * scale)
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scaled_height = int(height * scale)
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pixbuf = pixbuf.scale_simple(scaled_width, scaled_height,
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gtk.gdk.INTERP_BILINEAR)
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pixbuf.save(filename, "png")
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except:
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return
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#-------------------------------------------------------------------------
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#
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# run_thumbnailer
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#
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#-------------------------------------------------------------------------
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def run_thumbnailer(mime_type, src_file, dest_file, size=const.THUMBSCALE):
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"""
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This function attempts to generate a thumbnail image for a non-image.
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This includes things such as video and PDF files. This will currently
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only succeed if the GNOME environment is installed, since at this point,
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only the GNOME environment has the ability to generate thumbnails.
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@param mime_type: mime type of the source file
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@type mime_type: unicode
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@param src_file: filename of the source file
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@type src_file: unicode
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@param dest_file: destination file for the thumbnail image
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@type dest_file: unicode
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@param size: option parameters specifying the desired size of the
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thumbnail
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@type size: int
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@rtype: bool
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@returns: True if the thumbnail was successfully generated
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"""
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# only try this if GCONF is present, the thumbnailer has not been
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# disabled, and if the src_file actually exists
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if GCONF and const.USE_THUMBNAILER and os.path.isfile(src_file):
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# find the command and enable for the associated mime types by
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# querying the gconf database
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base = '/desktop/gnome/thumbnailers/%s' % mime_type.replace('/', '@')
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cmd = __get_gconf_string(base + '/command')
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enable = __get_gconf_bool(base + '/enable')
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# if we found the command and it has been enabled, then spawn
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# of the command to build the thumbnail
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if cmd and enable:
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sublist = {
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'%s' : "%d" % int(size),
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'%u' : src_file,
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'%o' : dest_file,
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}
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cmdlist = [ sublist.get(x, x) for x in cmd.split() ]
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os.spawnvpe(os.P_WAIT, cmdlist[0], cmdlist, os.environ)
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return True
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return False
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#-------------------------------------------------------------------------
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#
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# get_thumbnail_image
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#
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#-------------------------------------------------------------------------
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def get_thumbnail_image(src_file, mtype=None, rectangle=None):
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"""
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Return the thumbnail image (in GTK Pixbuf format) associated with the
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source file passed to the function. If no thumbnail could be found,
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the associated icon for the mime type is returned, or if that cannot be
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found, a generic document icon is returned.
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The image is not generated everytime, but only if the thumbnail does not
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exist, or if the source file is newer than the thumbnail.
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@param src_file: Source media file
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@type src_file: unicode
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@param mime_type: mime type of the source file
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@type mime_type: unicode
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@param rectangle: subsection rectangle
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@type rectangle: tuple
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@returns: thumbnail representing the source file
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@rtype: gtk.gdk.Pixbuf
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"""
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try:
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filename = get_thumbnail_path(src_file, mtype, rectangle)
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return gtk.gdk.pixbuf_new_from_file(filename)
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except (gobject.GError, OSError):
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if mtype:
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return Mime.find_mime_type_pixbuf(mtype)
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else:
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default = os.path.join(const.IMAGE_DIR, "document.png")
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return gtk.gdk.pixbuf_new_from_file(default)
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#-------------------------------------------------------------------------
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#
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# get_thumbnail_path
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#
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#-------------------------------------------------------------------------
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def get_thumbnail_path(src_file, mtype=None, rectangle=None):
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"""
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Return the path to the thumbnail image associated with the
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source file passed to the function. If the thumbnail does not exist,
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or if it is older than the source file, we create a new thumbnail image.
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@param src_file: Source media file
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@type src_file: unicode
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@param mime_type: mime type of the source file
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@type mime_type: unicode
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@param rectangle: subsection rectangle
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@type rectangle: tuple
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@returns: thumbnail representing the source file
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@rtype: gtk.gdk.Pixbuf
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"""
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filename = __build_thumb_path(src_file, rectangle)
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if not os.path.isfile(src_file):
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return os.path.join(const.IMAGE_DIR, "image-missing.png")
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else:
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if not os.path.isfile(filename):
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__create_thumbnail_image(src_file, mtype, rectangle)
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elif os.path.getmtime(src_file) > os.path.getmtime(filename):
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__create_thumbnail_image(src_file, mtype, rectangle)
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return os.path.abspath(filename)
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