On May 31, 2006, at 11:07 AM, Olaf Krzikalla wrote:
Hi,
actually I have two questions:
1. How can I obtain an CGLayer from an HIView?
Suppose I have an HIView and need a CGLayer compatible with that
view. I
have to use CGLayerCreateWithContext. Hence I need a CGContext. But
according to the docs the only time I have a CGContext is during
handling of
a paint message (creating a CGContext from a QD port is no option,
because
its deprecated and in some scenarios I even have no QD port).
All this leads to the weird fact, that I have to create a dummy
CGLayer
during the first paint message, which later I can use to create my
actual
CGLayers. I don't think that this is an intended user story of
CGLayer...
At this point I don't believe we have any recommended way to use
CGLayer with HIView. We haven't investigated what it would take to do
this properly.
2. Can I prevent background drawing in an HIView?
Suppose I have an HIView with metal attribute set. Profiling has
shown, that
drawing the metal background is an important factor in terms of
performance.
Also I know that the content of my whole HIView (the client area of
the
window) actually is opaque. That is, all the metal background
drawing after
an invalidate is always overdrawn and thus redundant. Can I supress
the
background drawing ?
Yes, just set the Opaque feature bit on your HIView:
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Quartz-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quartz-dev/email@hidden
