Re: [pygame] Perf - No. of rects vs area of rects

[Jason Marshall <jmm0@xxxxxxxxx>]

Number of rects is not very important. 

The total area is much more important. Also, aligning surface widths to multiples of 16 and blitting to locations on the x axis that are multiples of 16 can help the performance of the blitting. (I just learned that from this mailing list.) Setting the source surface's RLEACCEL flag helps if there is a lot of solid coloration in your source surface.

This script reduces the update area as much as possible:

  https://bitbucket.org/jmm0/optimize_dirty_rects/downloads

Jason

From: Abhas Bhattacharya <abhasbhattacharya2@xxxxxxxxx>

To: pygame-mirror-on-google-groups@xxxxxxxxxxxxxxxx
Sent: Saturday, June 14, 2014 8:13 PM
Subject: [pygame] Perf - No. of rects vs area of rects

Does the performance of pygame.update depend solely on no. of rects or total area of all rects passed to it?

I was thinking of a small speedup by splitting two intersecting rects into three non-intersecting rects, which will reduce the toal area, but increase the no. of rects.

Its probably a very small gain, and might result in a actual loss if the no. of rects explode. But if I know for sure that performance depende solely on one factor or the other, small gains like h=this might be possible.