This is probably a very simple question.
I am currently trying to set a jpeg(don't mind using a pdf or other
format) as the background image for a dialog
I am writing in carbon and I just cannot work out how to do this
I have looked at the API's and example code but nothing seems to help
I am trying to do this for a splash screen
I want the code to be both backwards and forwards compatible (so no
quick draw and no hiview)
which makes things complictated
Any help would be very much appreciated
Hi Simon,
A few tips first:
- you should specify a subject for your message
- since this is a Carbon question, it's more appropriate for the
carbon-dev mailing list than for quartz-dev
Your request that the solution use neither Quickdraw nor HIView is
very limiting. You almost have to use one or the other; not using
either doesn't leave you much room for a solution.
A solution that works on 10.2 and later would be:
- create a compositing window
- embed an HIImageView into the compositing window's content view.
Position it at the bottom of the window's view hierarchy.
- load the background image into memory using
CGImageCreateWithJPEGDataProvider
- set the HIImageView's image to be the CGImage that you've loaded
It's important to use a compositing window, because in a non-
compositing window, the controls in the window will erase their
content areas before drawing, and that will leave blocky white
splotches on your picture. It's possible to avoid this for some
controls by patching out the QD bottlenecks for the port while the
control is drawing, but not easy, so we highly recommend compositing
mode.
-eric
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