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Porter-Duff composition support? [message #650847]

Wed, 26 January 2011 14:26

Eclipse User

Hi again,
I'm wondering if the GC class provides any API for managing Porter-Duff composition rules. I didn't see one, but maybe I am just missing it.
Thanks,
Greg

Re: Porter-Duff composition support? [message #651014 is a reply to message #650847]

Thu, 27 January 2011 08:05

Eclipse User

Hi,

I'm not sure if you are looking for alpha blending. If so, see examples below (they use GC.setAlpha()) --
--> Advanced Graphics Example
--> Alpha Tab . You can see this in action by running the Graphics example

[Updated on: Thu, 27 January 2011 08:07] by Moderator

Re: Porter-Duff composition support? [message #651036 is a reply to message #651014]

Thu, 27 January 2011 09:31

Eclipse User

Alpha blending is part of it, but there are other rules that can be applied that define how overlapping shapes should be painted:

http://en.wikipedia.org/wiki/Porter-Duff

AWT represents these compositing rules in the AlphaComposite class:

http://download.oracle.com/javase/6/docs/api/java/awt/AlphaC omposite.html

I was just wondering if there was an equivalent in SWT.

Greg

Re: Porter-Duff composition support? [message #769704 is a reply to message #651036]

Thu, 22 December 2011 09:59

Eclipse User

The Porter Duff rules appear to be fully supported in Cairo. Support in SWT would allow the creation and manipulation of transparent images with the standard, hardware supported, graphics libraries. This would be a huge win for both ease of use and performance compared to the current, pixel by pixel manipulations required by the current API.

Are there any important SWT target platforms that don't support compositing rules now?

-- Jim

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