I solved this problem after few tests. I used SetPixelFormat to set ARGB when
the image surface was created, then modified the alpha value of each pixel. The
transparency works. Sorry to bother you guys.
-Jack
--- On Tue, 11/17/09, Jack W <ji...@yahoo.com> wrote:
From: Jack W <ji...@yahoo.com>
Subject: Re: [directfb-dev] Image and alpha mask problem
To: directfb-us...@directfb.org, directfb-dev@directfb.org
Date: Tuesday, November 17, 2009, 8:51 PM
Hi Niels,
I created a surface with a jpg file. But I found its pixel format was 24bits
RGB. There was no alpha, so I could not modify the alpha on this jpg surface by
using Lock/Unlock. (But the pixel format is 32bits ARGB if the loaded image
is png.)
My question is how to convert the jpg surface to 32bits (ARGB) surface so that
I can modify the transparency of the jpg image when I blit it on primary
surface.
Thanks a lot!
-Jack
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