nanogui: [nanogui] GrCopyArea
Subject:
Re: [nanogui] GrCopyArea
From:
Jordan Crouse ####@####.####
Date:
15 Aug 2001 15:26:49 -0000
Message-Id: <01081509270805.21329@cosmic>
Unfortunately, while MWROP_SRCTRANSCOPY is defined, it has never been
implemented. Hopefully this will get changed soon, as there are lots of
people interested in getting this working. I don't know who specified these
defines in the first place (Greg, Alex??) but obviously somebody was
intending to get them working in the future.
A pixmap is very different from an MWIMAGEHDR. A pixmap is a drawable window
that is not drawn on the screen, but rather implemented in memory. It can be
drawn to just like a window. A MWIMAGEHDR (or GR_IMAGE_HDR for clients) is a
structure that contains information about an image. These two items are
completely different, and not associated in any way.
Jordan
On Wednesday 15 August 2001 09:14, Ib Jørgensen mentioned:
> Hi all
> We are using GrCopyArea to draw pixmaps on the screen and this works out
> very nicely. We would however like to not copy one specific colour.
> This seems to be possible since GrCopyArea takes a ROP to pass to the
> blitter, and in mwtypes.h we find the following definition:
>
> /* copy src -> dst except for transparent color in src*/
> #define MWROP_SRCTRANSCOPY 0x01000000L
>
> Just what we need. Now our problem is to set the correct transparent color
> in the appropriate struct. This should be a MWIMAGEHDR. - but we only have
> an id to the pixmap we are using - how do we get to the appropriate header?
>
> > Ib Jørgensen Lead Technical Consultant
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