I'm trying to implement KDE4.4 oxygen style for XFWM4, but currently i can only use solid color, because radial gradient is impossible to implement - lack of stretching is the greatest problem, and the fact that fragments (1-5) sizes are defined by title text size makes it even worse. I'd like to have a way to use single stretchable background image.
As i have found, Oxygen style can't be implemented via images. There needs to exist a theming engine API for this.
I have also had difficulty (it's impossible) porting themes to xfwm4 due to a lack of title image stretching, for example Reluna 3 by bant. A large number of windows and KDE themes are unportable due to this limitation, making it harder to reach for the low-hanging fruit when theming XFCE. The minimum fix for this would be allowing some (maybe just the center one) of the titlebar images to be smoothly scaled rather than tiled. Thank you, -Shira