nanogui: How to draw pixmap with transparency
Subject:
Re: [nanogui] How to draw pixmap with transparency
From:
Julian Smart ####@####.####
Date:
27 Feb 2002 10:20:16 -0000
Message-Id: <4.2.0.58.20020227100945.03875940@pop>
At 09:10 AM 1/22/02 -0700, Jordan Crouse wrote:
>You can draw any image type that supports transparency with the
>GrDrawImage*.
>However, at this point you can't blit (ie GrCopyArea) an image with <br>
>transparent parts, but that will be coming soon.
>
>Jordan
Has anyone perhaps used a series of GrCopyArea calls with different ROPs
to draw a pixmap transparently using another pixmap as mask? This is
what's done in the wxWindows WIN32 port (if the native Windows masked drawing isn't
implemented). I could try it myself but it would mostly be guesswork since the ROPs
for Nano-X are likely to be slightly different from WIN32's.
I'm at the point with the wxWindows for Nano-X port where transparent pixmap drawing
is needed in order for the widget set to render properly...
A separate question -- is there a Nano-X-approved to way to convert font sizes expressed
in points to a height in pixels? I currently use the pixels-per-cm value to calculate it
but I get > 40 pixels for a point size of 12, which is a bit excessive.
Thanks,
Julian
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