Blender Git Loki

Annotations: Set better default name for new annotation layers

Note: Many of the add layer operators still need tweaks,
but this is a good start for the main ones.

Annotations: Restore color selector per layer

This shows up in the layer list, making it possible to quickly change it
inline, and to see what color the strokes in the layer are using.

GP/Annotations: Provide usage hints about the "Poly" tool

Annotations: Don't respect the "on back" option

This is too complicated for an annotation tool

Remove "Continuous Drawing" flag/mode

* GP Object doesn't need this as it has a proper "Draw Mode"

* For Annotations, it just got in the way and was a confusing
modal+blocking nuissance that randomly activates when you just
want to draw a quick line

Annotations Fix: "Freehand" mode now works

Was over-zealous when removing code from the drawing operator
to remove all the non-essential additions here.

Now annotations work in some of the 2D views:
* Nodes/Image Editor are confirmed to work
* Sequencer Preview needs further work
* Movie Clip editor works

Fix stabilizer cursor after annotations

The cursor was drawn to wrong position after use annotations.

Cleanup: Change "Drawing Tools" panel to use the annotation tools, not old GP drawing operator

This panel is going away soon, to be replaced by the active tools system.
But in the meantime, we need to stop using this old panel as it will
cause crashes when used.

Fix: Errors in console when using annotations in viewport

Was caused by a missing poll callback for a GP object panel

Annotations: Put in place basic building blocks for Annoations UI (WIP)

This is still a rough draft, just restoring all the essential bits and
pieces to have a workable system.

Cleanup: Remove unused stuff

Cleanup: Move GP-Object specific UI panels to the appropriate file

3D Annotations: Restore ability to access annotations from the 3D view

For now, the "gpencil" context properties work as follows:
* If the active object is a GP Object, the GP data associated with
that is returned
* Otherwise, the Scene's GP data (i.e. annotations) are used

We may need to revise this later. But in the meantime, I'm restoring
this so that we have a quick way of figuring out what parts of the
annotation tool workflow are currently broken.

TODO: Note some struct members that should be moved to runtime data struct

Annotations: Properly initialise annotation datablocks

Annotations: Repurpose an ancient/rarely-used flag to indicate that a GP datablock is used for annotations

Cleanup: Move comments to sit above the right structs

Annotations: First steps towards having working annotations again

Copy-back (from 2.8) and split out "Annotations" drawing operator/rendering
code from the "GP Object" versions of the same code.

Notes:
* All "annotation" related things are now in the annotate_*.c files,
while "drawgpencil.c" and "gpencil_paint.c" are for the GP Object only
now. This will simplify maintenance of the two different usecases,
as the GP Object versions are significantly more complicated and filled
with extra cruft.

* The general "Grease Pencil" keymap (i.e. the one that allows DKEY+LMB-drag
to draw) is now for annotation usage only. For GP Objects, you can add a
blank GP Object, enter Draw Mode, and start drawing.

Code Changes:
* Removed all 2D drawing-code entrypoints from drawgpencil.c

* Cleaned up most of the annotate_paint.c and annotate_draw.c code
to remove stuff that annotations won't use (e.g. brushes, palettes,
fancy line effects, etc.) As much as possible, these have been restored
back to a pre 2.77 state - with the notable exception of per-layer
Onion Skinning, for which the settings were removed already.

Cleanup: Remove all mention of annotations from GP drawing operator

Set again mix pass to DEPTH_LESS

Using ALWAYS for this pass is wrong because when using several objects, only the less z-depth object is drawn.