Re: please....correct png support

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Re: please....correct png support
by Andrea Albarelli on Tuesday 11/Sep/2001, @05:07

I think the author was talking about full PNG support ... last time I checked the alpha channel in PNG wasn't supported ( alpha under 127 was transparent and >= 127 was visible ).

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Re: please....correct png support
by Richard Moore on Tuesday 11/Sep/2001, @05:12

Qt 3 uses the XRender extension to provide hardware accelerated alpha channel support. This means that the alpha information in an image with will be applied automatically when the image is drawn.

Rich.

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Re: please....correct png support
by Richard Stellingwerff on Tuesday 11/Sep/2001, @11:41

I wonder though, this X-Render thing is supposed to be so cool, but does it act on changes behind the alpha blended image? Because Mosfet's transparent menus do not update when a window beneath it (xchat for example) changes.

Now this usually isn't an issue with websites, but I was just wondering, is this a limitation of the X-Render, or just lazy coding from Mosfet (or anyone who uses the X-Render code)?

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Re: please....correct png support
by anonymous on Tuesday 11/Sep/2001, @15:38

I may be wrong, but I think that the X-Render extention it's not yet in place.

If I remember well, Mosfet make transparent menus by first saving in a buffer the image behind the menu and then showing it as the background of the menu; that is why it doesn't get updated when the real background does.

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Re: please....correct png support
by Daniel Molkentin on Wednesday 12/Sep/2001, @13:16

It is wrong. XFree has full support for XRender since 4.1 on almost all drivers.

Qt3 supports XRender. So from now on we can use XRender in KDE.

Greetings,

</daniel>

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Re: please....correct png support
by Marcus Camen on Tuesday 11/Sep/2001, @05:13

Yep. KDE doesn't fully support transparent PNGs.
Just look at http://www.libpng.org/pub/png/pngs-img.html with Mozilla and Konqueror or go to http://bugs.kde.org/db/20/20155.html .

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Re: please....correct png support
by oliv on Wednesday 12/Sep/2001, @00:54

Exactly what I meant :)
Thanks for precisingg my thought (for me, it was obvious, but it did not seem to actually be for everyone)

Treating PNG without the alpha channel is like dispaying a colour image in grayscale. Of course we can see something, but it's just wrong.

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