[wx-dev]: Draw a lot of text in a short amount of time

[Armel Asselin]

Hi,

----- Original Message ----- 
From: "Angelina Geiger" <geiger at ems-wuensche.com>
Sent: Monday, June 23, 2008 4:49 PM
Subject: [wx-dev]: Draw a lot of text in a short amount of time
> Hello all,
>
> I have an application where I have to draw a lot of text within a short 
> amount of time. It's a custom widget which clears the drawing area and 
> draws some lines with text periodically (100-250ms).
>
> Now I'm experience an ugly performance problem. If my application runs the 
> X-Server needs nearly 30% CPU time. I've found out that my OnPaint handler 
> needs nearly 50ms. to draw and the most time is spent during 
> wxMemoryDC::DrawText.
there are two possibilities:
- either you draw very few text and the cost per glyph is very high (maybe 
some option/text rendering stuff slow), does it behave the same with any 
font/rendering/quality options?
- or you draw large amount of text, from which potentially only a small 
amount is really visible, in this case can you select the portions of text 
that you draw? (specific lines, or portions within lines...)

> Is there anyone out there who has an idea how to make this really fast?
>
> Thanks in advance.
>
> Regards Angelina

HIH
Armel