def get(self, tiles):
for metatile in tiles:
metaimage = None if metatile.data is None else Image.open(
StringIO(metatile.data))
for tilecoord in metatile.tilecoord:
if metatile.error:
tile = Tile(tilecoord)
tile.metadata = metatile.metadata
tile.error = metatile.error
yield tile
continue
if metatile.data is None:
tile = Tile(tilecoord)
tile.metadata = metatile.metadata
tile.error = "Metatile data is None"
yield tile
continue
x = self.border + (tilecoord.x -
metatile.tilecoord.x) * self.tile_size
y = self.border + (tilecoord.y -
metatile.tilecoord.y) * self.tile_size
image = metaimage.crop(
(x, y, x + self.tile_size, y + self.tile_size))
string_io = StringIO()
image.save(string_io, FORMAT_BY_CONTENT_TYPE[self.format])
yield Tile(tilecoord,
data=string_io.getvalue(),
content_type=self.format,
**metatile.metadata)
