Re: supportsDrawGState

[Quentin Mathé]

Hi Fred,

Le 13 juin 2011 à 14:41, Fred Kiefer a écrit :

> I had to restrict the usage of the new image drawing mechanism for the cairo 
> backend to the cases where the clipping region is representable as a list of 
> rectangles. With the new drawing code we store and restore the GState and 
> this only works correctly when the clipping region is composed of rectangles.

I don't see where the gstate is saved/restored in the new drawing code and not 
in the old code path. I checked both Back and  Gui. Which lines are you 
referring to precisely?
In Back cairo_save() and cairo_restore() seems to be used in both cases. On the 
Gui side, PSgsave(), DPSgsave(), PSgrestore() or DPSgrestore() seems to be used 
in the same way in the two drawing methods.

> The problem became obvious in the JigSaw Application which is now part of GAP 
> and which does use non-rectangular shapes for its pieces. These pieces where 
> drawn incorrectly with the new drawing mechanism but correctly with the old 
> one.

Are they drawn correctly on Mac OS X?

> I would love to see a better solution for this, so feel free to suggest one.

Agreed :-)

Cheers,
Quentin.