GPencil: Add Fill option to determine the layers used for boundary strokes

This is a patch suggested in https://blender.community/c/rightclickselect/qggbbc/

The valid values are:

* Visible Layers.
* Active Layer.
* Layer Above active.
* Layer Below active.
* All layers Above active.
* All layers Below active.

Differential Revision: https://developer.blender.org/D8474

Some minor UI changes done in the original patch.

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index efc712544ca..aa8f20d4c8a 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -243,6 +243,15 @@ static EnumPropertyItem rna_enum_gpencil_fill_draw_modes_items[] = {
     {GP_FILL_DMODE_CONTROL, "CONTROL", 0, "Edit Lines", "Use edit lines as fill boundary limits"},
     {0, NULL, 0, NULL, NULL}};
 
+static EnumPropertyItem rna_enum_gpencil_fill_layers_modes_items[] = {
+    {GP_FILL_GPLMODE_VISIBLE, "VISIBLE", 0, "Visible", "Visible layers"},
+    {GP_FILL_GPLMODE_ACTIVE, "ACTIVE", 0, "Active", "Only active layer"},
+    {GP_FILL_GPLMODE_ABOVE, "ABOVE", 0, "Layer Above", "Layer above active"},
+    {GP_FILL_GPLMODE_BELOW, "BELOW", 0, "Layer Below", "Layer below active"},
+    {GP_FILL_GPLMODE_ALL_ABOVE, "ALL_ABOVE", 0, "All Above", "All layers above active"},
+    {GP_FILL_GPLMODE_ALL_BELOW, "ALL_BELOW", 0, "All Below", "All layers below active"},
+    {0, NULL, 0, NULL, NULL}};
+
 static EnumPropertyItem rna_enum_gpencil_brush_modes_items[] = {
     {GP_BRUSH_MODE_ACTIVE, "ACTIVE", 0, "Active", "Use current mode"},
     {GP_BRUSH_MODE_MATERIAL, "MATERIAL", 0, "Material", "Use always material mode"},
@@ -1646,6 +1655,12 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Mode", "Mode to draw boundary limits");
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
 
+  prop = RNA_def_property(srna, "fill_layer_mode", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_sdna(prop, NULL, "fill_layer_mode");
+  RNA_def_property_enum_items(prop, rna_enum_gpencil_fill_layers_modes_items);
+  RNA_def_property_ui_text(prop, "Layer Mode", "Layers used as boundaries");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+
   prop = RNA_def_property(srna, "brush_draw_mode", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_sdna(prop, NULL, "brush_draw_mode");
   RNA_def_property_enum_items(prop, rna_enum_gpencil_brush_modes_items);