[patch #8781] [back] Faster bitmap drawing on Cairo

[Fred Kiefer]

Update of patch #8781 (project gnustep):

                  Status:                    None => Done                   
             Assigned to:                    None => FredKiefer             
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

I tried your patch on my computer and here are the results.

Before:

fred@hugo:~/GNUstep/Examples/decimal> openapp ./speed.app/
2015-10-27 23:40:42.885 speed[3507:3507] Speed test for image of size: {width
= 512; height = 512}
2015-10-27 23:40:42.978 speed[3507:3507]  500 32-bit draws: 0.880506 sec.
2015-10-27 23:40:42.978 speed[3507:3507]  500 24-bit draws: 0.796557 sec.
2015-10-27 23:40:42.978 speed[3507:3507]  500 reads: 0.930946 sec.

After:

fred@hugo:~/GNUstep/Examples/decimal> openapp ./speed.app/
2015-10-27 23:44:25.920 speed[3888:3888] Speed test for image of size: {width
= 512; height = 512}
2015-10-27 23:44:25.922 speed[3888:3888]  500 32-bit draws: 0.810091 sec.
2015-10-27 23:44:25.922 speed[3888:3888]  500 24-bit draws: 0.776128 sec.
2015-10-27 23:44:25.922 speed[3888:3888]  500 reads: 0.958851 sec.


As you can see there are only minimal speed ups for the drawing cases and a
small slow down for the reading one. Overall my computer, which is rather old,
seems to be 10 times faster than your Raspberry Pi. Overall the variations
between different runs of the same code seem to be higher than between the
different code versions.

I will apply your patch anyway, as it helps on very slow machines.



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