def __init__(self, infile, media_id=None, filext='jpg', tilesize=256):
"""Create a new Tiler for tiling the media given by `media_id` with the
image given by `infile`.
If `media_id` is omitted, it will be set to `infile`.
Tiles will be saved in the format indicated by `filext` and with the
dimensions given by `tilesize`.
"""
Thread.__init__(self)
self._infile = infile
self.__filext = filext
self.__tilesize = tilesize
if media_id:
self.__media_id = media_id
else:
self.__media_id = infile
self.__outpath = TileStore.get_media_path(self.__media_id)
self.__progress = 0.0
self.__logger = logging.getLogger(str(self))
self.error = None
def run(self):
"""Tile the image. If any errors are encountered then `self.error` will
be set to a string describing the error.
run() -> None
"""
self.__logger.debug("beginning tiling process")
self.__maxtilelevel = self.__calculate_maxtilelevel()
self.__numtiles = self.__calculate_numtiles()
## number of tiles that fit on the original image
self.__numtiles_across_total = \
(self._width+self.__tilesize-1)//self.__tilesize
self.__numtiles_down_total = \
(self._height+self.__tilesize-1)//self.__tilesize
## width and height of the right-most and bottom-most tiles
## respectively
self.__right_tiles_width = (self._width - 1) % self.__tilesize + 1
self.__bottom_tiles_height = (self._height - 1) % self.__tilesize + 1
try:
with TileStore.disk_lock:
## recursively tile the image
self.__tiles()
except Exception, e:
self.error = str(e)
outpath = TileStore.get_media_path(self.__media_id)
shutil.rmtree(outpath, ignore_errors=True)