[Kde-pim] Review Request: speedup kmail.

[Jaime Torres Amate]

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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/101697/
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Review request for KDEPIM.


Summary
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NOTE: The patch is incomplete. It lacks a signal handler, remove some comments....
But I want to know if I'm using the right path, specially with the MessageItem fonts. Do I really need to store the fontKey for every item?
Also, is this ABI and binary compatible?

In any case, as you could see in the attached screenshots, it makes the method cachedFontHeight go from 70% cpu usage to 5% (cachedFontHeightKey) just showing my kmail bugs folder (with around 40.000 mails).


Diffs
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  messagelist/core/messageitem.h 832e861 
  messagelist/core/messageitem.cpp 6018fad 
  messagelist/core/messageitem_p.h cdf9ff1 
  messagelist/core/theme.h 2ebf66f 
  messagelist/core/theme.cpp bff6f86 
  messagelist/core/themedelegate.h 90abcb8 
  messagelist/core/themedelegate.cpp dad2847 

Diff: http://git.reviewboard.kde.org/r/101697/diff


Testing
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Kmail feels faster. Callgrind says that QFont.key() usage is almost neligible after the patch is applied.


Screenshots
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before the patch
  http://git.reviewboard.kde.org/r/101697/s/184/
after the patch
  http://git.reviewboard.kde.org/r/101697/s/185/


Thanks,

Jaime Torres

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