On Jan 30, 2007, at 4:14 PM, Steve Christensen wrote:
Yes. For alpha, I'd like to be able to make changes relative to an
arbitrary current context alpha setting, i.e., CGContextSetAlpha
(theContext, CGContextGetAlpha(theContext) * 0.5) -- assuming a
CGContextGetAlpha function existed.
If you do this, you'll get the alpha double counted. Whatever alpha
you set for the context is automatically calculated into further
drawing operations on the context, including those that include alpha
drawing. So the effective alpha of any drawing operation is
pixelAlpha * contextAlpha.
--
David Duncan
Apple DTS Quartz and Printing
email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Carbon-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/carbon-dev/email@hidden
