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Re: NSBitmapImageRep: RGB-data (565 mode)

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Re: NSBitmapImageRep: RGB-data (565 mode)

Subject: Re: NSBitmapImageRep: RGB-data (565 mode)
From: Troy Stephens <email@hidden>
Date: Thu, 30 Jun 2005 11:03:41 -0700

On Jun 29, 2005, at 3:24 PM, Mike Smith wrote:

Hi list,

I am having trouble creating NSImage from raw RGB data (565 mode). To
my understanding that NSBitmapImageRep initWithBitmapDataPlanes only
supports aligned bps.
How can I create a bitmap image from RGB data 585 mode?
Any sample code or suggestion will be greatly appreciated.

Thanks,
Mike

NSBitmapImageRep doesn't intrinsically support RGB 565-format pixel data; you'll need to first promote the data to RGB 888.

A useful trick is to replicate the high bits of each original sample value in the low bits of the new value. For the 5-bit 'R' and 'B' samples, for example, you'd shift the original value left 3 bits, and OR that with its top 3 bits, shifted down into the low 3 bit-positions:

new = (old << 3) | (old >> 2)

--
Troy Stephens
Cocoa Frameworks
Apple Computer, Inc.


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  >NSBitmapImageRep: RGB-data (565 mode) (From: Mike Smith <email@hidden>)




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