[Development] About copying the image buffer with alpha blending

Holger Hans Peter Freyther holger at freyther.de
Wed Aug 29 21:54:38 CEST 2012


On Wed, Aug 29, 2012 at 10:19:05AM +0200, Samuel Rødal wrote:
> On 08/29/2012 09:53 AM, ext song.7.liu at nokia.com wrote:
> 
> Are you also scaling or transforming the image? 30-50ms seems a bit much
> for just a blend operation as you say.

converting color format and depth? Do you have an example that reproduces
the behavior? A painttrace (okay still broken with Qt5). The thing that comes
very handy on Linux is  "perf record -g ./test_case" followed by a perf
report. Where does your testcase spend the time?

holger




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