gEDA-dev: Xrender support for lesstif PCB

[Peter Clifton]

On Fri, 2007-11-30 at 12:49 +0000, Kai-Martin Knaak wrote:
> On Fri, 30 Nov 2007 01:56:44 +0000, Peter Clifton wrote:
> 
> > Cairo has opacity built in, so no need for XRender calls. ARGB, where A
> > is opacity. You may / may not need to set the surface up for it.
> > 
> > As suggested for PCB, drawing layers to spearate off-screen surfaces
> > (from cairo_surface_create_similar()), then compositing layer by layer
> > onto the main drawable might be the way forward.
> 
> Has anyone checked how inkscape does transparency? This app seems to cope 
> with thousands strokes and polygons without crippling delay.  

Current versions don't use cairo.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)