Is AlphaBlend Implemented On Linux?
lazarus / 39-Graphics

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garlar27 · 2011-01-17 14:03

Is AlphaBlend Implemented On Linux?

if not:

Does any body knows if someone is working on it?


Thanks.

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cpalx · 2011-01-17 14:18

If the drivers are correctly installed then works perfeclty [in linux]

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garlar27 · 2011-01-17 15:08

How do I know f the drivers are correctly installed?

My Ubuntu 9.10 can show PNG's AlphaBlend correctly. but within Lazarus
apps it don't shows them as expected.

I've attached 2 PNGs the original (btnPre.png) and a screen capture of
a skinned button I'm doing where the AphaBlend isn't working.

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cpalx · 2011-01-17 16:18

what version of lazarus/fpc are you using?

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garlar27 · 2011-01-17 16:29

0.9.28.2-0 Beta
FPC 2.2.4

I just wanted to know if it was fixed in the new version or the svn

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vvzh · 2011-01-17 17:55

As of 0.9.30 branch, it does not work with GTK2 widgetset but works
with Qt. Though you will need libqt4pas to run Lazarus applications
built using Qt widgetset.

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garlar27 · 2011-01-17 20:16

Dough!!! 

Nobody is working to implement it in GTK2?

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Vincent Snijders · 2011-01-18 09:37

garlar27, this is your chance

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garlar27 · 2011-01-18 14:09

Well, I'm screwed...

I still don't have what it takes to do that (specially time)... May be
I'll try during my vacations...

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José Mejuto · 2011-01-18 18:38

Quote from: Vincent Snijders on January 18, 2011, 10:37:19 amgarlar27,
this is your chance

Hello,

Do you know the reason why a bitmap is being used for the mask instead
a pixmap ? Or why not a pixbuf is being used ?

I'm pretty new to gtk so I'm quite lost

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Vincent Snijders · 2011-01-19 07:51

Since you are quoting me, I will answer: No, I don't know.

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Marc · 2011-01-19 09:34

The simple reason is that in the beginneing there were no alpha
rendering functions in gtk. The only thing possible was masking. thats
why a bitmap is used.
And to keep lazarus a bit remote X friendly, all client side rendering
was avoided. Its on my roadmap to add support for drawing on a cairo
context (which supports alpha drawing)