tiles & memory

[Boudewijn Rempt]

Just discussed on irc, and for the record:

I propose an addition to KisPaintDevice (and the underlying datamanager):

bool lockRegionInMemory(QRect)
bool unlockRegion(QRect)

both, of course, thoroughly mutexed so we're prepared for multi-threading. The 
idea is that the datamanager would keep the region in memory so, for 
instance, the convolution painter can work with pointers instead of 
laboriously copying the memory.

Relatedly: let's set the minimum number of tiles (64x64xchannelsxchanneldepth 
bytes) to at least 1000, and let's not allow the user to specify a value 
lower than that. Krita is an image editor, not a postage stamp editor!

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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