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Offscreen context alignment issues

Subject: Offscreen context alignment issues
From: "R. Scott Thompson" <email@hidden>
Date: Mon, 21 Feb 2005 00:06:07 -0600
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Out of curiosity, more than any particular need to know, is there any hints for optimizing "row bytes" for the pixel buffers of offscreen graphics contexts?

For example, I know that Mac OS X and AltiVec like to have aligned data (16 byte aligned?) and that malloc works to ensure that alignment for memory blocks it allocates. I also know that vImage likes to have images where the rowbytes are not even powers of 2 (because "performance may be adversely affected for some functions").

Are there similar guidelines for getting the best performance out of an an offscreen Quartz bitmap context?

Scott

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