[cairo] Default line width == 2.0?

[Calum Robinson]

I have started a CoreGraphics (Mac OS X native drawing API) backend for 
Cairo, and so far I have had reasonable success, except for drawing 
lines.

The sample app I am using has only 2 Cairo drawing calls in it (taken 
from the snippets page):

cairo_move_to (cr, 0.5, 0.1);
cairo_line_to (cr, 0.9, 0.9);

When my CoreGraphics port draws this, is works, only the line is twice 
as thick as the screen. At a glance, this appears to be because 
CAIRO_GSTATE_LINE_WIDTH_DEFAULT is 2.0, but I get the impression that 
lines aren't set up to be twice as think as the default canvas size. 
What am I missing?


Calum Robinson
http://homepage.mac.com/calumr