On Tue, 2010-08-10 at 17:29 +0900, Alesh Slovak wrote: > Hello, > > Regarding GdkPixbufLoader's size-prepared signal, the documentation claims: > "This signal is emitted when the pixbuf loader has been fed the initial amount > of data that is required to figure out the size of the image that it will create." > > Which, to me, seems to imply that the signal is emitted only once. However, I am > receiving it almost as frequently as the area-updated signal. Bluefish uses the size-prepared signal to scale images while they are being written. The size-prepared signal is only emitted one. > <snip...> > > Furthermore, the documentation states: > "Applications can call gdk_pixbuf_loader_set_size() in response to this signal > to set the desired size to which the image should be scaled." > > 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? > > For the record, I am using gtkmm 2.4 on Debian testing and attempting to load > PNM data. I didn't get the feeling that this was a gtkmm specific issue, but I > could be wrong. I tried loading an PNM image in Bluefish's image dialog and it loaded correctly. Might try looking at the Bluefish code. However, it is written in C. http://bluefish.svn.sourceforge.net/viewvc/bluefish/trunk/bluefish/src/plugin_htmlbar/image_dialog.c?revision=5965&view=markup The pixbuf loader is created in image_dialog_set_preview(). The size-prepared signal is connected here. The image data is then read async. The read status is returned to image_dialog_load_preview(). If the image was successfully read, the code under OPENFILE_FINISHED is executed. This calls gdk_pixbuf_loader_write(). The size-prepared signal handler is called to scale the image, pbloader_size_prepared(). If the calls to gdk_pixbuf_loader_write() and gdk_pixbuf_loader_close() return successfully, then the pixbuf is read with gdk_pixbuf_loader_get_pixbuf(). Regards, Jim H _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
