|Summary:||Wayland gtk clients broken by 38a242a: spans,image,gl: Add fast-path for simple copies|
|Component:||gl backend||Assignee:||cairo-bugs mailing list <cairo-bugs>|
|Status:||RESOLVED FIXED||QA Contact:||cairo-bugs mailing list <cairo-bugs>|
|i915 platform:||i915 features:|
Patch against 38a242a which fixes this bug
Description bugzilla 2012-04-02 16:34:14 UTC
When using gtk-based programs on wayland, cairo commit 38a242a "spans,image,gl: Add fast-path for simple copies" makes them corrupted. Specifically, I think, any partly-repainted regions become transparent, and remain so until the window is fully repainted. gnome-calculator demonstrates the problem quite nicely.
Comment 1 Darxus 2012-04-05 07:17:04 UTC
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
Comment 2 Uli Schlachter 2012-04-05 09:42:55 UTC
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. :-)
Comment 3 Darxus 2012-04-06 19:09:06 UTC
(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.
Comment 4 Darxus 2012-04-12 07:44:11 UTC
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
Comment 5 Darxus 2012-04-12 07:45:57 UTC
Ugh, please ignore the previous comment. That change did not fix this problem.
Comment 6 Darxus 2012-04-12 08:03:17 UTC
src/cairo-gl-spans-compositor.c - spans.copy_boxes = copy_boxes; +// spans.copy_boxes = copy_boxes; Doesn't seem to fix it either.
Comment 7 bugzilla 2012-04-13 13:21:42 UTC
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.
Comment 8 Chris Wilson 2012-05-04 02:16:17 UTC
commit 748dcdef4b67097c079a3ff98f970451428c24f3 Author: Chuanbo Weng <firstname.lastname@example.org> 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
on Dec 02, 2016 at 19:56:34.
(provided by the Example extension).