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Christian Hergert d122b66abc clutter/actor: avoid transform node for identity matrix
If the transform matrix is an identity, then positioning wont change and
we can avoid creating the transform node altogether. This is based on
a similar find in GTK today while reducing temporary allocations.

This cuts the number of transforms created in clutter_actor_paint() by
about half under light testing of GNOME Shell from 6.8% to 2.4% of
allocations.

Before:

    ALLOCATED      TOTAL    FUNCTION
[   20.4 MiB] [  21.20%]    clutter_actor_paint
[   11.0 MiB] [  11.45%]      clutter_paint_node_paint
[    6.6 MiB] [   6.84%]      clutter_transform_node_new
[    2.5 MiB] [   2.61%]      clutter_actor_node_new

After:

    ALLOCATED      TOTAL    FUNCTION
[   33.4 MiB] [  24.12%]    clutter_actor_paint
[   26.2 MiB] [  18.91%]      clutter_paint_node_paint
[    3.4 MiB] [   2.43%]      clutter_actor_node_new
[    3.3 MiB] [   2.41%]      clutter_transform_node_new

Allocation amounts will have differed due to different amounts of running
time, but the % of allocations has now dropped below
clutter_actor_node_new() which should be expected.

https://gitlab.gnome.org/GNOME/mutter/issues/1056
2020-02-20 06:41:34 +00:00
.gitlab/issue_templates gitlab: Add missing < in markdown comment tag 2020-02-14 03:10:28 +00:00
.gitlab-ci ci: Change instructions to use podman 2019-12-11 12:56:28 +01:00
clutter clutter/actor: avoid transform node for identity matrix 2020-02-20 06:41:34 +00:00
cogl cogl: GLES3 has sync objects 2020-02-19 17:55:46 +00:00
data wayland: Add setting/api to check the policy to set up the X11 display 2019-08-06 00:41:36 +00:00
doc Remove obsolete .cvsignore files 2019-01-10 11:50:54 -02:00
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src wayland: Move MetaWindow ownership to window owning roles 2020-02-19 22:34:28 +00:00
tools tools: Remove obsolete ppa-magic.py 2018-11-30 11:12:12 +08:00
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README.md README: Add contribution section 2019-02-14 15:38:46 +01:00

Mutter

Mutter is a Wayland display server and X11 window manager and compositor library.

When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.

When used on top of Xorg it acts as a X11 window manager and compositing manager.

It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.

Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork af Clutter, a scene graph and user interface toolkit.

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To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.

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