Porter/Duff Image Compositing Article - Internet News - News

Internet News : Porter/Duff Image Compositing Article

Posted by Rogue on 2008/8/25 17:17:33 (2835 reads) News by the same author

Since Porter/Duff style image compositing will be part of AmigaOS 4.1, I've decided to try and start a series of articles on the topic. Part one is now up, and can be found here. I want to extend this series in the future, and also go into the programming itself, including sample code.

Part one is just a general overview of the concept of Porter/Duff image compositing, with no programming knowledge required. Part 2 will go into the theory of operation and explain the basic usage in AmigaOS 4.1.

Feedback is appreciated.

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Author	Thread
TSK	Published: 2008/8/25 17:49 Updated: 2008/8/25 17:49
Just can't stay away Joined: 02/23/2007 From: Finland, the land of Santa, sauna, sisu and salmiakki Comments: 1210	Re: Porter/Duff Image Compositing Article @Rogue Thanks making this article ! (Pole)

TMTisFree	Published: 2008/8/25 17:49 Updated: 2008/8/25 17:49
Just popping in Joined: 12/05/2006 From: Nice, so nice Comments: 163	Re: Porter/Duff Image Compositing Article Ah, at least some doc. about features of OS4.1. Much appreciated, thank you. Bye, TMTisFree

nubechecorre	Published: 2008/8/25 18:03 Updated: 2008/8/25 18:03
Just can't stay away Joined: 11/24/2006 From: Sanremo Comments: 1910	Re: Porter/Duff Image Compositing Article Thanks ^_^

glames	Published: 2008/8/25 20:03 Updated: 2008/8/25 20:03
Not too shy to talk Joined: 11/28/2006 From: France, Nantes Comments: 258	Re: Porter/Duff Image Compositing Article @Rogue, Thanks! glames

ZeroG	Published: 2008/8/25 20:07 Updated: 2008/8/25 20:07
Not too shy to talk Joined: 12/08/2006 From: Germany Comments: 394	Re: Porter/Duff Image Compositing Article @Rogue Nice article. Does 4.1 has its own PDIC-API, or does the system use Cairo internally to do PDIC?

Menthos	Published: 2008/8/25 20:12 Updated: 2008/8/25 20:12
Just popping in Joined: 11/29/2006 From: Bure�, Sweden Comments: 103	Re: Porter/Duff Image Compositing Article Thanks! Looking forward to the next chapter!

noelfuller	Published: 2008/8/26 8:25 Updated: 2008/8/26 8:25
Just popping in Joined: 07/21/2008 From: Auckland, New Zealand Comments: 19	Re: Porter/Duff Image Compositing Article Now that is an excellent introduction. I hope everyone reads it. Noel

Atheist	Published: 2008/8/26 10:15 Updated: 2008/8/26 10:15
Quite a regular Joined: 11/28/2006 From: Vancouver, B.C., Canada Comments: 759	Re: Porter/Duff Image Compositing Article Thank you Rogue. I'm not a programmer, but it's appreciated that you've gone to this trouble. Hey, if it's not taught by you (or any from AOS4.x dev team), they'll learn it in the streets, and we all know how that turns out.

DBAlex	Published: 2008/8/26 12:45 Updated: 2008/8/26 12:46
Just popping in Joined: 07/20/2008 From: UK Comments: 34	Re: Porter/Duff Image Compositing Article @Rogue Cool! I've seen demos of Cairo on Linux before... very impressive stuff... and this also opens up the possibility for scalable icons (SVG) etc (Infact SVG datatypes are allready available for AmigaOS) One thing I would like to ask though... are the OS4 interface elements (Window "Gradient" & Style etc) Now drawn with Cairo completely or are they still bitmaps? And if they aren't, are there any plans to draw them with Cairo in the future? Cheers, Alex.

salass00	Published: 2008/8/26 13:26 Updated: 2008/8/26 13:26
Just can't stay away Joined: 11/30/2006 From: Finland Comments: 1899	Re: Porter/Duff Image Compositing Article @DBAlex Note that there are actually two "svg" formats. First there is the rather obscure SuperView Graphics format which is supported by Andreas Kleinert's svg datatype and is a bitmap format. Then there is the Scalable Vector Graphics format which is supported by my svg.datatype for OS4, which makes use of libsvg/libsvg-cairo and afxgroup's cairo port (on OS4Depot) to render the svg vector graphics.

Rogue	Published: 2008/8/26 13:49 Updated: 2008/8/26 13:49
Quite a regular Joined: 11/24/2006 From: Comments: 624	Re: Porter/Duff Image Compositing Article Compositing is implemented as a single call in graphics.library. You can use it without touching Cairo, in fact, I've written two programs that make use of it. One displays a real-time thumbnail preview of the screen, the other is a lens that can zoom the screen with the mouse wheel. Should make commodities out of them, really.

Rogue	Published: 2008/8/26 13:51 Updated: 2008/8/26 13:51
Quite a regular Joined: 11/24/2006 From: Comments: 624	Re: Porter/Duff Image Compositing Article @DBAlex Cairo isn't used internally yet, only the compositing. Cairo was included mostly to have it available; in the future, more and more stuff will make use of it though.

Snuffy	Published: 2008/8/28 19:36 Updated: 2008/8/28 19:36
Just can't stay away Joined: 12/06/2006 From: Michigan Comments: 1027	Re: Porter/Duff Image Compositing Article Thanks for article. If I read again three more times I might learn something!