Support for per-track Grease Pencil datablocks for motion tracking

Originally was needed to reach easy way of defining masks used for tracking
(do eliminate textures which doesn't belong to feature when tracking.

Implemented as alternative to GP datablock for clip and added switch between
per-clip and per-track GP datablocks -- internal limitations of GP doesn't
allow to display all GP datablocks easily.  So either you see.edit GP associated
with clip or with track.

GP strokes associated with track are relative to track's position, following
tracks during tracking and could be shared between several tracks.

Masking code presents in libmv and there's rasterizer of GP datablocks for
masks in blender's tracking module, but they still need to be glued together.

Some documentation cound be found at this page:

http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.64/Motion_Tracker#Grease_Pencil

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 98ff8ab70bf..cafe8ebefad 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -3003,6 +3003,12 @@ static void rna_def_space_clip(BlenderRNA *brna)
 		{0, NULL, 0, NULL, NULL}
 	};
 
+	static EnumPropertyItem gpencil_source_items[] = {
+		{SC_GPENCIL_SRC_CLIP, "CLIP", 0, "Clip", "Show grease pencil datablock which belongs to movie clip"},
+		{SC_GPENCIL_SRC_TRACK, "TRACK", 0, "Track", "Show grease pencil datablock which belongs to active track"},
+		{0, NULL, 0, NULL, NULL}
+	};
+
 	static EnumPropertyItem pivot_items[] = {
 		{V3D_CENTER, "BOUNDING_BOX_CENTER", ICON_ROTATE, "Bounding Box Center",
 		             "Pivot around bounding box center of selected object(s)"},
@@ -3212,6 +3218,13 @@ static void rna_def_space_clip(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Show Seconds", "Show timing in seconds not frames");
 	RNA_def_property_update(prop, NC_MOVIECLIP | ND_DISPLAY, NULL);
 
+	/* grease pencil source */
+	prop = RNA_def_property(srna, "grease_pencil_source", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "gpencil_src");
+	RNA_def_property_enum_items(prop, gpencil_source_items);
+	RNA_def_property_ui_text(prop, "Grease Pencil Source", "Where the grease pencil comes from");
+	RNA_def_property_update(prop, NC_MOVIECLIP | ND_DISPLAY, NULL);
+
 	/* pivot point */
 	prop = RNA_def_property(srna, "pivot_point", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "around");