On 2/13/2013 3:12 AM, Justin Lebar wrote:
c) Consider adaptive techniques so that users who use this feature
heavily will store more screenshots (at the cost of more memory),
while those who don't use it won't pay a price.
Apart from the other solution of re-rendering directly from bfcache,
this seems like the obvious longer-term solution, and it ties in with
Josh's proposal about "ddd". I don't think there's any way to make
absolute judgements about whether 2.5MB or 5MB or 10MB is "reasonable"
for a feature, and there's a lot of room for adaptive data-driven
behavior here. If the computer is memory-constrained, then we should be
evicting all sorts of memory-based caches pretty aggressively, and this
is one of them. OTOH, if the computer has memory available, we should be
using *all* of it any place we can trade memory for speed.
Other possible technical tradeoffs that might be possible:
* render from bfcache if its present
* when we evict from bfcache, take a high-res snapshot
* when things go back far enough, compress or resample the image to a
low-res snapshot.
Is there a video/demo/feature page which explains what this feature
actually is? I've seen status updates about a new cool swipe thing, but
I don't actually know what problem its solving. Is this feature
mac-only, or is it starting out on mac and we'll be porting it back to
other platforms? Or is it touchscreen-only?
--BDS
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