ahocevar 2ee362a79b New tile image cache and tile queue improvements ...

We now reuse tile images by maintaining a cache of image elements with a
simplified LRU expiry policy (by order, not by timestamp). The tile queue
is bypassed for images that are available in the cache, so they can be
rendered immediately. And the tile queue itself loads more than just one
image at a time now (2 per layer url).

2012-12-23 16:57:24 +01:00

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