On Wed, 2010-08-11 at 16:13 +0900, Alesh Slovak wrote: > >> But when I do this, the image data never makes it into the pixbuf, although the > >> pixbuf itself appears to get sized correctly. > > > > Are you trying to get the pixbuf from the loader too soon? > > This appears to be the case. I was getting the pixbuf from the loader in the > handler for the area-prepared signal, which worked just fine as long as I didn't > call gdk_pixbuf_loader_set_size() in the size-prepared handler. Quoting from the docs, "area_prepared", will be called as soon as the pixbuf of the desired has been allocated. You can obtain it by calling gdk_pixbuf_loader_get_pixbuf(). If you want to use it, simply ref it. In addition, no actual information will be passed in yet". >From that I would expect that no image data is written until area-updated is called. I wouldn't expect a call to gdk_pixbuf_loader_get_pixbuf() to produce a displayable image in area-prepared. > Getting the pixbuf in the area-updated handler fixes this particular problem. So > now I can get a scaled image out of the pixbuf loader. I am still receiving > multiple size-prepared signals, but it doesn't seem to be having any ill effects > as far as I can tell. I still find it strange that you are seeing multiple size-prepared signals. I've only ever seen it emitted once and from the docs I would only expect to see it once. Are you making multiple calls to gdk_pixbuf_loader_write()? I've never tried it. but according to the docs... "This will cause a pixbuf loader to parse the next count bytes of an image." >From that, I wonder if it would be possible to progressively show an image by making multiple calls to gdk_pixbuf_loader_write() and instead of passing the full size of image, just pass a specific number of bytes to parse until the image is fully loaded. Doing this would still allow using gdk_pixbuf_loader_set_size() to scale the image while it is loaded. > > I happened to notice one peculiar thing though, when I call > gdk_pixbuf_loader_set_size(), the area-updated signal is only ever called once, > after the image has finished loading. Thus, I can't update the display to show > the image loading progressively. I guess loading/displaying image data > progressively and scaling at the same time are not supported by GdkPixbufLoader? I've never tried to progressively load the image. Your seeing only one area-updated signal does make it sound like progressively loading and scaling the image with gdk_pixbuf_loader_set_size() is not supported. Regards, Jim H _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
