Blender Git Loki

GPencil: Add invert mask option to Mask subpanel

GPencil: Make Mask panel as Subpanel

GPencil: Don't add mask layers to mask list

This avoid cyclic relations

GPencil: Back Mask Switch to 2 modes: ON/OFF

GPencil: New list of Masking Layers

This replaces the old unique layer for masking with a full list.

GPencil: Fix missing eyedropper options in toolbar

Merge branch 'greasepencil-object' into greasepencil-refactor

Merge branch 'master' into greasepencil-object

GPencil: Rename masking layer references when rename mask layer

GPencil: Use new BKE_gpencil_layer_named_get() instead of generic BLI

GPencil: Fix compiler warnings

GPencil: Refactor: Fix display bug of strokes endpoints

GPencil: Refactor: New linked mask system

The new system is more flexible and a bit simpler from the code side.

Each layer has a mask layer slot. If filled with a correct layer name,
the mask layer will be rendered again in a separate buffer. This buffer
will then be used in the blend pass to modulate the opacity of the layer.

This approach is not 100% equivalent to the standard layering in most 2D
applications if using varying alpha on a mask applied to multiple layers.
However this technique does support any ordering arrangement of the masks.

The layers used as mask can now still render normaly.

Merge branch 'greasepencil-object' into greasepencil-refactor

Merge branch 'master' into greasepencil-object

GPencil: Rename collision to boundbox

The initial use of the variables was collision, but now are used for more things, so it's better put a more general name.

GPencil: Fix merge errors

Also, the modiifer reuse precalculated bounding box data.

Merge branch 'greasepencil-object' into greasepencil-refactor

Conflicts:
source/blender/blenloader/intern/readfile.c

Merge branch 'master' into greasepencil-object

GPencil: Remove unused drawing code for interpolate operator