GtkSnapshot and push_blur()

[gnumdk (Cédric Bellegarde)]

Hello, I’m trying to add a blur effect with GTK4 but there is a strange transparency effect around borders, any idea ?

class Picture(Gtk.Picture):
    def do_snapshot(self, snapshot):
        rect = Graphene.Rect()
        rect.init(
            0, 0, self.get_allocated_width(), self.get_allocated_height()
        )
        snapshot.push_blur(100)
        rgba=Gdk.RGBA()
        rgba.alpha = 0.5
        rgba.red = rgba.blue = rgba.green = 0
        Gtk.Picture.do_snapshot(self, snapshot)
        snapshot.pop()
        snapshot.append_color(rgba, rect)

[baedert (Timm Bäder)]

Not sure what you mean exactly or what the expected outcome should be, but…

1. That’s a rather large blur radius, you shouldn’t expect that to be usable performance-wise
2. Don’t use get_allocated_width/height. You want get_witdth()/get_height().

[gnumdk (Cédric Bellegarde)]

Here the same blur with Pillow library, there is no transparency on image borders.