Blender Git Loki

Cleanup: name of image poll function

Fix T70317: Equal clip range crashing in Hue Correct & RGB Curves Nodes

It takes many changes to support the drawing of zero-sized curves.
Best skip these cases to avoid crash.
Blender 2.79 had no support either.

Image: add resize operator

Now possible with new image undo,
was added for testing but seems generally useful.

Image: support storing full image buffers for each undo step

Update image undo to store buffers for each step:

- Undo buffers share tiles to avoid using too much memory.
- Undo support for different sized buffers
allowing operations such as crop or resize.
- Paint tiles have been split into separate API/storage.
- Painting speed wont be impacted significantly
since storing the extra tiles is done after the stroke & only
for the first undo step.

Resolves T61263, see D5939 for details.

Cleanup: convert some macros to functions

Cleanup: avoid multiple active vertex loops

Sculpt: enable 3D paint cursor for multires

Cleanup: internal sculpt refactoring related to multires, no user visible changes

Cleanup: slightly more efficient access to PBVH multires grid key

Cleanup: abstract sculpt floodfill code

Cleanup: avoid accessors, reduce memory usage, multithread dirty mask

Cleanup: make sculpt vertex random access API read-only

Cleanup: prefer PBVH iterator over random vertex access in some places

Cleanup: avoid unnecessary brush radius test in mask expand

Cleanup: don't go through sculpt accessor functions multiple times

Cleanup: compiler warning

BLI: optimize GSQueue implementation to allocate in chunks, like BLI_Stack

Fix T70206 Texture Paint: UV shadow doesnt show up

Fix T70325 EEVEE: Performance regression with large nodetrees

This was caused by nodeChainIter which is not linear complexity.
Introduce nodeChainIterBackwards to iterate backwards faster.

GPencil: New Tools for transforming UVs

The new tools are for translate, rotate and scale the UVs for any fill stroke using texture.

This was a missing option for UVs in grease pencil.