Hi guys,
Just swap the alpha and blue channels. Problem solved.
-Chilton
On Thursday, May 25, 2006, at 09:37AM, David Niemeijer <email@hidden> wrote:
>-- originally posted a few days ago, but now changed the title to
>better match the question
>
>Hi Mike,
>
>At 9:26 -0700 26/4/06, Mike Paquette wrote:
>>OpenGL can help here, as it includes the ability to convert pixel
>>formats, and can even deal with hardware-specific pixel reading
>>problems such as microtiling, or getting the correct framebuffer
>>when full screen buffer swapping (the GL version of page flipping)
>>is in effect. OpenGL will also use a DMA transfer for reading the
>>framebuffer content, where available.
>>
>>OpenGL provides both a synchronous read path suitable for simple
>>screen captures using glReadPixels, and a fast asynchronous path
>>using the texture read mechanism, which is a bit more complex, but
>>works well for repeated capture operations, such as screencasting or
>>recording a movie from the screen.
>>
>>Here's a simple mechanism that can be used to read a rectangle from
>>a display to a CGImageRef, as an example to help you get started.
>>It's more comment than code:
>
>Your code sample works pretty well, except for one thing. On Intel
>machines the colors look pretty awkward. I am sure some swapping
>needs to take place, but not being a quartz/opengl specialist, I am
>not sure what the best approach would be. Would you mind indicating
>what would need to be done to make the sample code work correctly on
>both Intel and PowerPC?
>
>Thanks,
>
>david.
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