[Webkit-unassigned] [Bug 27292] Improve handling of <canvas> path operations on an empty path.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=27292





--- Comment #4 from Dean McNamee <deanm at chromium.org>  2009-07-15 03:10:04 PDT ---
(In reply to comment #3)
> Differs from Firefox, looks like the control point vs endpoint, but I really
> don't see how control point could ever make any sense.  I'll look at their code
> today, and maybe file a bug with them.
> 
> (In reply to comment #2)
> > (From update of attachment 32772 [details] [details])
> > In general this seems okay to me -- how does the output compare to firefox?

Ok, so Firefox just passes this directly to cairo:

162 void
163 gfxContext::LineTo(const gfxPoint& pt)
164 {
165     cairo_line_to(mCairo, pt.x, pt.y);
166 }

And Cairo has the control point behavior:

http://cairographics.org/manual/cairo-paths.html#cairo-curve-to

If there is no current point before the call to cairo_curve_to() this function
will behave as if preceded by a call to cairo_move_to(cr, x1, y1).

I think they should cairo_has_current_point() and cairo_move_to the endpoints
if not.  I'll file a bug with Mozilla.  I wonder why Cairo has this behavior.

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