<html> <head> <style></style> </head> <body class='hmmessage'> Thank you very much for all the info!<div>I will try the workaround in the meantime and stay tuned :)<div> </div><div>Julien > Date: Sat, 27 Nov 2010 11:42:35 +0100 > Subject: Re: [cairo] cairo-1.10 regression? > From: ranma42@gmail.com > To: julien_bramary@msn.com > CC: cairo@cairographics.org > > On Fri, Nov 26, 2010 at 4:11 PM, Julien Bramary <julien_bramary@msn.com> wrote: > > Hey guys, > > I tried 1.10 today and found some odd glitches in my application. I narrowed > > it down to a vertical and horizontal line crossing showing > > strange artefacts. > > The concerned lines either have a non-integer width or non-integer starting > > and end points. > > Here is the code snippet I used to test this (the code before that paints > > the background to white): > > layer_0 = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 600, 600); > > cairo_t *cr = cairo_create (layer_0); > > cairo_set_source_rgb (cr, 1, 1, 1); > > cairo_paint (cr); > > double x = 50.323; > > double y = 50.768; > > cairo_set_operator (cr, CAIRO_OPERATOR_OVER); > > cairo_set_source_rgb (cr, 0.1f, 0.1f, 0.1f); > > cairo_set_line_width (cr, 6); > > cairo_move_to (cr, x, 0); > > cairo_line_to (cr, x, 600); > > cairo_move_to (cr, 0, y); > > cairo_line_to (cr, 600, y); > > cairo_stroke (cr); > > The screenshots attached clearly show that 1.8.10 is doing the right thing > > with the semi-transparent bits whereas 1.10.0 is not. > > Anyone seen this with 1.10? I couldn't find related bugs in the tracker. I > > just tried with latest Git version and it still happens. > > I can confirm the problem. It is caused by a bug in the implementation of the > rectilinear rasterizer. > > A temporary workaround might be to avoid the rectilinear rasterizer, for > example by adding a degenerate curve: > > cairo_rel_curve_to (cr, 0, 0, 0, 0, 0, 0); > > right before stroking. > > I'm working on fixing the implementation, but it will probably require some > nontrivial changes to the rectilinear rasterizer. > > Andrea </div></div> </body> </html>