Breeze widget style for KF5

[Hugo Pereira Da Costa]

On 08/12/2014 11:34 PM, Àlex Fiestas wrote:
> On Monday 11 August 2014 12:51:21 Milian Wolff wrote:
>> a) what's the advantage of having a native widget style, compared to using
>> QtCurve settings? Are there things missing / not implementable in QtCurve?
> We did some rought tests and QtCurve was waaaay slower than Oxygen (that at
> the same time was slower than Fusion).
>
> The test we did was re-painting widgets over and over with different styles and
> then measuring instructions and time iirc.
>
> Cheerz.
Hi Alex,

many thanks for doing this test (glad to hear that oxygen is not the 
biggest beast around :))

Now, to be honest, I'm not sure how 'relevant' the test is, and the 
outcome might well be very GPU related.
Oxygen, unlike QtCurve, uses a lot of QPixmap all over the place for 
rendering and caching, which is known to be quite expensive on some 
GPUs, and not at all on others.
Also, for the comparison to fusion, oxygen has tons of animations, which 
causes several (as opposed to one) localized repaints for basically each 
user interaction, and this will cost, naturally. (not sure what's the 
status of QtCurve with that respect).
In any case, I'd also be curious to see the outcome for the current 
breeze code (kde:scratch/hpereiradacosta/breeze), for which the 
rendering is supposedly much simpler than oxygen, and no caching is 
used. (but animations are there)

Best,

Hugo

>
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