def prepare(self, streams):
        for f in self.prepare_filters:
            map(f, streams)
        return streams

    # state icon: bookmark star, or deleted mark
    def prepare_filter_icons(self, row):
        if conf.show_bookmarks:
        if conf.show_bookmarks:# and "bookmarks" in self.parent.channels:
            # and "bookmarks" in self.parent.channels:
            row["favourite"] = self.parent.bookmarks.is_in(row.get("url", "file:///tmp/none"))
            # this should really go into bookmarks plugin itself,
            # disadvantage: would decelerate processing loop further
        if not row.get("state"):
            if row.get("favourite"):
                row["state"] = gtk.STOCK_ABOUT
            if row.get("deleted"):
                row["state"] = gtk.STOCK_DELETE

    

    
# Check for valid image binary, possibly convert or resize, then save to cache filename
def store_image(imgdata, fn, resize=None):

    # Convert accepted formats -- even PNG for filtering now
    if re.match(br'^(.PNG|GIF\d+|.{0,15}JFIF|\x00\x00\x01\x00|.{0,255}<svg[^>]+svg)', imgdata):
    if re.match(br'^(.PNG|GIF\d+|.{0,15}(Exif|JFIF)|\x00\x00\x01\x00|.{0,255}<svg[^>]+svg)', imgdata):
        try:
            # Read from byte/str
            image = Image.open(BytesIO(imgdata))
            log.FAVICON_IMAGE_TO_PNG(image, image.size, resize)

            # Resize
            if resize and image.size[0] > resize: