Hello, Zahra > Dear Andrey, > Thanks alot for your guidance, but when i change the buffer > data, image header is also changed, and when using > "gdk_pixbuf_loader_write", an error of "unrecognized image file > format" will be arised, this is because that the image format is > important for the loader. > is it any way to skip this restriction? > Thanks, > Zahra Zojaji No, this restriction cannot be skipped - even typed loader(created via gdk_pixbuf_loader_new_with_type()) need image header for loading image correctly.
But if you change buffer, can you also adjust header? By the way, pixbuf itself contains pixels as raw data - array of rows, each row is array of pixels (http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-gdk-pixbuf.html). May be, it is easier to manipulate with pixels of pixbuf itself? Or create copy of pixbuf, and manipulate with copy. Later you can synchronize pixbufs using gdk_pixbuf_copy or gdk_pixbuf_copy_area. > -----Original Message----- > From: Andrey Tsyvarev <tsyva...@ispras.ru> > To: zzoj...@aim.com > Cc: gtk-app-devel-list@gnome.org > Sent: Fri, 15 May 2009 5:39 pm > Subject: Re: How can I update the gdk-pixbuf raw data? > Hello, Zahra. You can use GdkPixbufLoader for retrieve pixbuf > from raw data. Code example: GdkPixbufLoader *loader = > gdk_pixbuf_loader_new(); gdk_pixbuf_loader_write(loader, buffer, > buffer_size, NULL); gdk_pixbuf_loader_close(loader, NULL); > GdkPixbuf* pixbuf = > gdk_pixbuf_copy(gdk_pixbuf_loader_get_pixbuf(loader)); > g_object_unref(loader); Now 'pixbuf' contains image, > previously stored in 'buffer'. If you want to do more complex > things, than simple restoring pixbuf from buffer, you may read > GdkPixbufLoader description > http://library.gnome.org/devel/gdk-pixbuf/stable/GdkPixbufLoader.html > > Hello, > I am new to GTK and have a problem with > gdk-pixbuf, How can I update the pixbuf raw data? > > There is a pixbuf constructed from an image file, I want > to > change raw data behind it and upload new data back to pixbuf. > I am > using the "gdk_pIxbuf_save_to_buffer" for accessing raw > data, but I > don't know how to upload the buffer back to the > pixbuf! > Thanks, in advance, > Zahra Zojaji > > _______________________________________________ > > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list -- > Andrey Tsyvarev Linux Verification Center, ISPRAS web: > http://www.linuxtesting.org e-mail: tsyva...@ispras.ru > We found the real 'Hotel California' and the 'Seinfeld' diner. > What will you find? Explore WhereItsAt.com. -- Andrey Tsyvarev Linux Verification Center, ISPRAS web: http://www.linuxtesting.org e-mail: tsyva...@ispras.ru _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
