Fwd: [cairo] Text display tuning question // tr: Re: [cairo] Fast text rendering

Hi Mark,

Do you manage to gain the 1000 factor similar to the Cairo Guys ????

@+Maarten,

==============================================================


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Hi Maarten,

I'm not sure what you mean with this?

I'm doing experiments with Cairo and it appears that its text displaying is about 7x slower than VW's (GDI) text rendering (not 1000 times slower as mentioned in the mail you forwarded). I just wanted to know if there are techniques to make it display text at the same speed as GDI.

It could be related to the double buffering because when I don't do that, it becomes 2x faster, but double buffering is required.

I tried things where I would cache string renderings onto an image and try to repeatedly use that one instead of #showText. It works and it's faster as long as you can reuse strings, but it would be easier if the text displaying would just have the same (or comparable) performance as GDI where I don't have to do the caching.

Of course, this problem only occurs in cases where I have to display lots of text like for instance in an Excel-like grid of data.

Travis told me that one of the points on his agenda would be to look at performance issues concerning Cairo/Pango.

Mark

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Maarten MOSTERT
Sent: dinsdag 13 juli 2010 22:43
To: VWNC
Subject: [vwnc] Fwd: [cairo] Text display tuning question // tr: Re: [cairo] Fast text rendering

Hi Mark,

Do you manage to gain the 1000 factor similar to the Cairo Guys ????

@+Maarten,

==============================================================


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Hi Mark,

Le 14 juil. 2010 à 09:18, Mark Plas a écrit :

> Hi Maarten,
>
> I'm not sure what you mean with this?
>

The main thing I wanted to indicate you is to check out the Cairo discussion related to this subject (there are many).
The once I moved over where just the once that I spotted yesterday.

> I tried things where I would cache string renderings onto an image and try to repeatedly use that one instead of #showText. It works and it's faster as long as you can reuse strings, but it would be easier if the text displaying would just have the same (or comparable) performance as GDI where I don't have to do the caching.

Did you try to write your complete grid to a big Cairo image and show this as a whole ? ?

Regards,

@+Maarten,

PS.  Still disappointed that we lost.....




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" Did you try to write your complete grid to a big Cairo image and show this as a whole ? ?"

--> yes, that's what I do with groupWhile: []

-----Original Message-----
From: Maarten Mostert [mailto:[hidden email]]
Sent: woensdag 14 juli 2010 9:44
To: Mark Plas
Cc: VWNC
Subject: Re: [vwnc] Fwd: [cairo] Text display tuning question // tr: Re: [cairo] Fast text rendering

Hi Mark,

Le 14 juil. 2010 à 09:18, Mark Plas a écrit :

> Hi Maarten,
>
> I'm not sure what you mean with this?
>

The main thing I wanted to indicate you is to check out the Cairo discussion related to this subject (there are many).
The once I moved over where just the once that I spotted yesterday.

> I tried things where I would cache string renderings onto an image and try to repeatedly use that one instead of #showText. It works and it's faster as long as you can reuse strings, but it would be easier if the text displaying would just have the same (or comparable) performance as GDI where I don't have to do the caching.

Did you try to write your complete grid to a big Cairo image and show this as a whole ? ?

Regards,

@+Maarten,

PS.  Still disappointed that we lost.....




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Hi Mark,

Within your groupWhile: [] you could do something like:

anImage := CairoGraphics.ImageSurface
format: CairoGraphics.CairoFormat argb32
extent: self bounds corner.

anImageCR := anImage context.
self renderBackgroundOn: anImageCR.
self draw: anImageCR.

aCR sourceSurface: anImage offset:( self bounds origin).

I use this to avoid the OSX bugs but didnt test if it is actually faster.

Regards,

@+Maarten,
many).
> The once I moved over where just the once that I spotted yesterday.
>
> > I tried things where I would cache string renderings onto an image and try to repeatedly use that one instead of
#showText. It works and it's faster as long as you can reuse strings, but it would be easier if the text displaying
would just have the same (or comparable) performance as GDI where I don't have to do the caching.


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