#1207 HIGH Opportu: Image scaling has become a performance issue

[Zarro Boogs per Child]

#1207: Image scaling has become a performance issue
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  Reporter:  jg               |       Owner:  jg                        
      Type:  task             |      Status:  new                       
  Priority:  high             |   Milestone:  Opportunity (please help!)
 Component:  x window system  |     Version:                            
Resolution:                   |    Keywords:  power, performance        
  Verified:  0                |  
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Comment(by MitchellNCharity):

 I ran into this when prototyping an activity which used a lot of image
 zooming.  Part of the problem is that Cairo apparently used high-quality
 but expensive interpolation for image enlargement.  Image shrinking used a
 cruder but faster approach.  This was several months ago now.

 I got improved, but still insufficient, performace by pre-expanding the
 images on disk, so shrinking could be used instead of expanding.  My next
 step would be to try using an separate library for the image scaling,
 perhaps combined with incremental display (start with a low quality image,
 pause, and if zoom hasn't changed a second later, replace it with a high
 quality one).

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Ticket URL: <https://dev.laptop.org/ticket/1207#comment:5>
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