Blender Git Loki

Fix T75985: Texture paint brush gradients results in wrong color

A Colorband's CBData color **is not** considered `PROP_COLOR_GAMMA`.
A Brushes color **is** considered `PROP_COLOR_GAMMA`.
(PROP_COLOR_GAMMA is used for colors which would be color managed before
display, could be renamed to something better once...)

This leads to different rgb values in ColorBand.CBData of br->gradient
and brush->rgb for seemingly identical colors. (this is because color
pickers do differently in case block->is_color_gamma_picker/
ui_but_is_color_gamma)

Now it looks like `paint_brush_color_get` is expected to return a color
in sRGB (according to @jbakker this is for legacy reasons) so we need to
run the colorband colors through linear -> sRGB.

It might very well be the case that a much deeper cleanup in this area
is needed, this is just a fix to get gradient brush colors
consistent again...

Maniphest Tasks: T75985

Differential Revision: https://developer.blender.org/D7501

Fix animation player checkerboard drawing with alpha channels

Was using uninitialized theme values.

GHOST: fix WITH_GHOST_DEBUG option

Changing the order of include changes broke GHOST_DEBUG,
however it was using defines in a fragile way.

Fix by removing 'GHOST_DEBUG' and use 'WITH_GHOST_DEBUG' which
was already defined by CMake.

Cleanup: printf warning

Cleanup: clang-format

Cleanup: unused variable warnings

Task: Use TBB as Task Scheduler

This patch enables TBB as the default task scheduler. TBB stands for Threading Building Blocks and is developed by Intel. The library contains several threading patters. This patch maps blenders BLI_task_* function to their counterpart. After this patch we can add more patterns. A promising one is TBB:graph that can be used for depsgraph, draw manager and compositor.

Performance changes depends on the actual hardware. It was tested on different hardwares from laptops to workstations and we didn't detected any downgrade of the performance.
* Linux Xeon E5-2699 v4 got FPS boost from 12 to 17 using Spring's 04_010_A.anim.blend.
* AMD Ryzen Threadripper 2990WX 32-Core Animation playback goes from 9.5-10.5 FPS to 13.0-14.0 FPS on Agent 327 , 10_03_B.anim.blend.

Reviewed By: brecht, sergey

Differential Revision: https://developer.blender.org/D7475

CMake: use system include for generated headers

GHOST: initial Wayland support

Usable with the CMake option 'WITH_GHOST_WAYLAND'

The following functionality is working:

- Building with X11 and Wayland at the same time,
wayland is used when available.
- Keyboard, pointer handling.
- Cursor handling.
- Dedicated off-screen windows.
- Drag & drop.
- Copy & paste.
- Pointer grabbing.

See D6567 for further details.

More experiments

Correct horizonal size offset

Adjust from review for part 1

Merge branch 'panel-list-patch' into panel-list-patch-2

Remove unecessary argument, change variable name

Fix returning local variable

Merge branch 'panel-list-patch' into panel-list-patch-2

Finish review changes

Merge branch 'panel-list-patch' into panel-list-patch-2

Cleanup: Address various review comments

Use wt->wcol directly