David Rajchenbach-Teller b7f59691ec Rework image_cache_task to avoid using url as key during the loading of an image. ...

A `url` can be very large, in particular if it is a data: url, so using it as a key for lookups whenever we load a few bytes is not a very good idea. This patch introduces an intermediate `LoadKey` (internally, an u64) that makes hashmap lookups faster. Somewhere along the way, we also get rid of a few calls to `url.clone()`.

2015-10-14 08:08:31 +02:00

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