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Porter-Duff composition support? [message #650847]

Wed, 26 January 2011 19:26

Greg Brown

Messages: 16
Registered: December 2010

Junior Member

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

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

Thu, 27 January 2011 13:05

Lakshmi P Shanmugam

Messages: 279
Registered: July 2009
Location: India

Senior Member

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

Lakshmi P Shanmugam

[Updated on: Thu, 27 January 2011 13:07]

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

Thu, 27 January 2011 14:31

Greg Brown

Messages: 16
Registered: December 2010

Junior Member

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

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

Thu, 22 December 2011 14:59

Jim Mayer

Messages: 18
Registered: July 2009

Junior Member

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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