Re: How can i create a alpha channel GdkPixbuf from a GdkPixmap and a GdkBitmap?

[Dov Grobgeld <dov grobgeld gmail com>]

Just loop over the bitmap bit by bit and modify the alpha channel of the corresponding pixbuf pixel to 0. Or did I miss something?

Regards,
Dov

On Mon, May 10, 2010 at 08:52, Lothar Scholz <llothar web de> wrote:

Hello gtk-list,

I have a programmatically created and drawn clipmask and the server
side pixmap. But i can't find out how i can create a pixbuf from these
two.


I got so far that this code gets me a pixbuf with an alphachannel
of all white pixels:

pixbuf = gdk_pixbuf_get_from_drawable(NULL,image->pixmap,NULL,0,0,0,0,-1,-1);
new_pixbuf = gdk_pixbuf_add_alpha(pixbuf,TRUE,255,255,255); //TODO
g_object_unref(pixbuf);
pixbuf = new_pixbuf;


Unfortunately this is not good enough for my problem.


--
Best regards,
 Lothar                          mailto:llothar web de

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