How to manually initialize a bitmap

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TSK

Re: How to manually initialize a bitmap

Posted on: 2011/6/27 11:38 #21

Just can't stay away

@Rogue

Thanks !

Rock lobster bit me - so I'm here forever
X1000 + AmigaOS 4.1 FE
"Anyone can build a fast CPU. The trick is to build a fast system." - Seymour Cray

Hans

Re: How to manually initialize a bitmap

Posted on: 2011/6/27 12:03 #22

Home away from home

Quote:

TSK wrote:
@Hans
Quote:
Chroma-keying is a different operation

I didn't mean real blue screen but how Apple does it changing background on the fly when you're sitting in front of a web cam.

In that situation you would have to use computer vision algorithms to segment the image into foreground and background, and turn that into an alpha mask. After that, you could use compositing to overlay the foreground over a new background.

Quote:

Quote:
You could start by creating an ARGB bitmap, and then use the fill rect operation to render a rectangle

Quote from Autodocs for SetRPAttrs() and RPTAG_APenColor: "The alpha part is currently ignored and should be set to 0xFF".

So it looks like no chance at the moment.

Use p96RectFill().

Hans

http://hdrlab.org.nz/ - Amiga OS 4 projects, programming articles and more.
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