Hi!
I both tried to make my background larger than the stage (suggested by
Tomas), and test-perspective, but the problem is still there.
Test-perspective was perfect. But test-perspective is not a real life
test to expose my problem. I modified it to have the problem reproduced.
Basically, I added a rotating image in the middle of the screen and the
problem appeared!
On my Nvidia FX-5200, running the Nvidia driver 1.0.9631 provided by
Ubuntu packages, I had a flashing red 1px ligne at the top of the
screen. It is not the whole line who's flashing, only 66% of it starting
from the right side. I am running Clutter 0.3.1 packaged for Feisty. Oh
and by the way, Clutter-gst-0.3.1 is missing from the repositories.
This can not be related to Cairo (as I first thought) since their is no
cairo code in this file. And it might not be perspective related.
Have a look for your self -- my test-perspective is attached
-- Pierre-Luc
Le vendredi 03 août 2007 à 10:11 +0100, Matthew Allum a écrit :
> I think this is a perspective 'bug' or GL feature where the perspective
> is slightly off and thus the stage appears slightly smaller (or larger)
> than the window pixels. I thought we'd fixed this but it could be you
> have a GL implementation that its not fixed for (what driver are you
> using) or your using an older version of clutter ?
>
> Can you also try running test-perspective and check you see 4 pixels, 1
> in each corner with a 1 pixel border ?
>
> -- Matthew
>
> On Fri, 2007-08-03 at 01:08 -0400, Pierre-Luc Beaudoin wrote:
> > Hi!
> >
> > I've noticed a rendering bug on my application (Sofa), and I'd like to
> > have your input on what might causing this problem. After I added a
> > cairo texture for background, when the screen is updated (by a
> > behavior for example), a 1 pixel line would blink at the top of the
> > screen. At first I though that my cairo texture wasn't big enough but
> > I make it larger than the screen and it didn't change a thing.
> >
> > Care to give it a look?
> >
> > The pixel line is white, which is the color of the stage. It looks
> > like the Cairo texture is redraw and their is a small round error. I
> > was able to reproduce this on 1024x768 and 1920x1200.
> >
> > Thanks!
> >
> > Pierre-Luc
>
#include <clutter/clutter.h>
// Call back for timeline
void rotate (ClutterTimeline *timeline,
gint frame_num,
gpointer actor) {
static float angle;
angle += 0.1;
ClutterActor * a = CLUTTER_ACTOR(actor);
clutter_actor_rotate_z(a, angle, clutter_actor_get_width(a)/2.0, clutter_actor_get_height(a)/2.0);
}
int
main (int argc, char *argv[])
{
ClutterActor *rect;
ClutterActor *stage;
ClutterColor red = {0xff, 0, 0, 0xff}, white = {0xff, 0xff, 0xff, 0xff};
ClutterTimeline * time;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
g_object_set (stage, "fullscreen", TRUE, NULL);
clutter_stage_set_color (CLUTTER_STAGE (stage), &red);
rect = clutter_rectangle_new_with_color (&white);
clutter_actor_set_size (rect,
clutter_actor_get_width(stage),
clutter_actor_get_height(stage));
clutter_actor_set_position (rect, 0, 0);
clutter_group_add (CLUTTER_GROUP (stage), rect);
rect = clutter_rectangle_new_with_color (&red);
clutter_actor_set_size (rect, 2, 2);
clutter_actor_set_position (rect, 1, 1);
clutter_group_add (CLUTTER_GROUP (stage), rect);
rect = clutter_rectangle_new_with_color (&red);
clutter_actor_set_size (rect, 2, 2);
clutter_actor_set_position (rect, clutter_actor_get_width(stage)-3, 1);
clutter_group_add (CLUTTER_GROUP (stage), rect);
rect = clutter_rectangle_new_with_color (&red);
clutter_actor_set_size (rect, 2, 2);
clutter_actor_set_position (rect, 1, clutter_actor_get_height(stage)-3);
clutter_group_add (CLUTTER_GROUP (stage), rect);
rect = clutter_rectangle_new_with_color (&red);
clutter_actor_set_size (rect, 2, 2);
clutter_actor_set_position (rect,
clutter_actor_get_width(stage)-3,
clutter_actor_get_height(stage)-3);
clutter_group_add (CLUTTER_GROUP (stage), rect);
//Rotating background
GdkPixbuf * pixbuf = gdk_pixbuf_new_from_file_at_size(
"/usr/share/icons/gnome/scalable/places/distributor-logo.svg",
clutter_actor_get_width(stage)/2.0,
clutter_actor_get_width(stage)/2.0,
NULL);
if (pixbuf){
rect = clutter_texture_new_from_pixbuf (pixbuf);
clutter_actor_set_position(rect, 0, 0);
clutter_actor_set_size(rect, clutter_actor_get_width(stage), clutter_actor_get_width(stage));
clutter_actor_set_opacity(rect, 64 );
clutter_actor_show_all (CLUTTER_ACTOR (rect));
clutter_group_add (CLUTTER_GROUP (stage), rect);
}
time = clutter_timeline_new (60, 360);
clutter_timeline_set_loop(time, TRUE);
g_signal_connect (time, "new-frame", G_CALLBACK (rotate), rect);
clutter_timeline_start(time);
//end of added stuff
clutter_actor_show_all (CLUTTER_ACTOR (stage));
clutter_main ();
return 0;
}
