On Oct 1, 2009, at 1:55 PM, Gabriel Zachmann wrote:
I am using Core Animation to display some images.
Is there an easy way to find out the following information?
1.
Query the properties GL_MAX_TEXTURE_SIZE and
GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB from the current OpenGL context
that Core Animation
must have acquired somewhere.
Well, it would suffice if I could get CA's current OpenGL context.
You can't get CA's GL context, so doing this directly is out (you
could query all the hardware on the system if you wanted and use the
min size of them all).
2. Find out the dimensions of an image on the disk, *before*
actually loading it into memory.
This should be possible both via ImageIO and NSImage.
The reason is that I occasionally get an error message saying
"CoreAnimation: X by Y image is too large for GPU, ignoring".
Are you on 10.5? On 10.6 Core Animation will break images up for you
so you should see this far less often (usually only when the image is
impossibly large).
If #1 is not easily achievable, then I guess I could hard-wire the
size to 2048x2048 for the moment. It's just not elegant.
This is actually more typical than you think :).
--
David Duncan
Apple DTS Animation and Printing
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