GPencil: Fill Dilate using negative values contract the fill area

This is requested by artist for some animation styles where is necessary to fill the area, but create a gap between fill and stroke.

Also some code cleanup and fix a bug in dilate for top area.

Reviewed By: pepeland, mendio

Differential Revision: https://developer.blender.org/D14082

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index 7ba2b3a4502..f3c7d2747ac 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -1615,12 +1615,13 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
       prop, "Stroke Extension", "Strokes end extension for closing gaps, use zero to disable");
   RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
 
-  /* Number of pixels to dilate fill area. */
+  /* Number of pixels to dilate fill area. Negative values contract the filled area. */
   prop = RNA_def_property(srna, "dilate", PROP_INT, PROP_PIXEL);
   RNA_def_property_int_sdna(prop, NULL, "dilate_pixels");
-  RNA_def_property_range(prop, 0, 20);
+  RNA_def_property_range(prop, -40, 40);
   RNA_def_property_int_default(prop, 1);
-  RNA_def_property_ui_text(prop, "Dilate", "Number of pixels to dilate fill area");
+  RNA_def_property_ui_text(
+      prop, "Dilate/Contract", "Number of pixels to expand or contract fill area");
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
   RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, NULL);