#8822 NORM Not Tri: Create an mmap'able icon cache

[Zarro Boogs per Child]

#8822: Create an mmap'able icon cache
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   Reporter:  benzea         |       Owner:  marco        
       Type:  defect         |      Status:  new          
   Priority:  normal         |   Milestone:  Not Triaged  
  Component:  sugar-toolkit  |     Version:  not specified
 Resolution:                 |    Keywords:               
Next_action:  never set      |    Verified:  0            
  Blockedby:                 |    Blocking:               
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Comment(by benzea):

 I'll attach a preliminary patche. The code needs some cleanup, but it is
 able to cache and return the masks (no normal image cache yet). The lookup
 in the cache file is filename based, and there are two classes:

 SugarIconCache:
  * lookup_icon(filename, size)
  * new(cache_filename)

 SugarIconCacheBuilder:
  * add_icon(filename, size)
  * write(cache_filename)

 There is currently also a public method render_masks, that returns the
 same data as a lookup in the IconCache would.

 The write happens atomically, and SugarIconCache will recheck after 5
 minutes, whether the cache has been updated, and reloads it if it did
 change.

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Ticket URL: <http://dev.laptop.org/ticket/8822#comment:1>
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