Verified mentioned first bad commit glitches, and commit before it works.  With wayland 0.85.

Video of problem here:  http://www.chaosreigns.com/wayland/demos/2012-04-03-wayland-gtk-glitches.html

Something caught my eye in that commit:

(In function composite_boxes(), cairo-gl-spans-compositor.c, line 371)

-    _cairo_gl_operand_translate (&setup.mask, -src_x, -src_y);
+    _cairo_gl_operand_translate (&setup.src, -src_x, -src_y);

From the surrounding code, I see that this change makes sense. However, it seems unrelated to the rest of this commit. Could someone check if just reverting this change makes the problems go away?

Disclaimer: I have no clue what I am doing here. :-)

(In reply to comment #2)
> seems unrelated to the rest of this commit. Could someone check if just
> reverting this change makes the problems go away?

I tried, it didn't help.

Created attachment 59861 [details] [review]
Patch against 38a242a which fixes this bug

Just

-       spans.draw_image_boxes = draw_image_boxes;
+//     spans.draw_image_boxes = draw_image_boxes;

in src/cairo-gl-spans-compositor.c

Ugh, please ignore the previous comment.  That change did not fix this problem.

src/cairo-gl-spans-compositor.c

-       spans.copy_boxes = copy_boxes;
+//     spans.copy_boxes = copy_boxes;

Doesn't seem to fix it either.

Created attachment 59939 [details] [review]
patch?

The attached sign-swap in _cairo_gl_operand_translate fixes this bug for me. I've checked gnome-calculator and gtk3-demo in wayland, and this fixes both of them.

I don't understand the code well enough to know why this fixes it, or why it was this way in the first place.

commit 748dcdef4b67097c079a3ff98f970451428c24f3
Author: Chuanbo Weng <strgnm@gmail.com>
Date:   Fri May 4 08:53:20 2012 +0800

    gl: fix the translate value in copy_boxes.
    
    Fixes 36 test cases (such as push-group-color)
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48221