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 --- On Mon, 11/16/09, Niels Roest <ni...@directfb.org> wrote: From: Niels Roest <ni...@directfb.org> Subject: Re: [directfb-dev] Image and alpha mask problem To: "Jack W" <ji...@yahoo.com> Cc: directfb-us...@directfb.org Date: Monday, November 16, 2009, 12:57 PM Hi Jack, SetSourceMask has unfortunately no software fall-back option. This means: only supported if your graphics card supports this in hardware, currently seems to be limited to the Radeon series. hth Niels Jack W wrote: > Hi all, > > I want to get the semi-transparent image by using an alpha mask image (png) > on a normal image (jpg). My code is very simple. All the materials and a > screen shot are attached. I used SetSourceMask. But I cannot see the > transparent image. Can anyone help me? My system: CentOS and DirectFB 1.4. > > Thanks a lot. > > -Jack > > > ------------------------------------------------------------------------ > > _______________________________________________ > directfb-dev mailing list > directfb-dev@directfb.org > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev -- .------------------------------------------. | DirectFB - Hardware accelerated graphics | | http://www.directfb.org/ | "------------------------------------------"
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