GPencil: Improve smooth operation

This patch makes the grease pencil smooth operation symmetric.
It also increases the performance a lot if strong smoothing is
required. Additionally there is an option for the position smooth
operation to keep the shape closer to the original for more iterations.

Since the result differs from the previous algorithm, versioning is used
to change the iterations and factor to match the old result.

Differential Revision: http://developer.blender.org/D14325

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index c86a852b0ea..b2b6bdbcffc 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -1355,7 +1355,8 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
   /* Smoothing factor for new strokes */
   prop = RNA_def_property(srna, "pen_smooth_factor", PROP_FLOAT, PROP_NONE);
   RNA_def_property_float_sdna(prop, NULL, "draw_smoothfac");
-  RNA_def_property_range(prop, 0.0, 2.0f);
+  RNA_def_property_range(prop, 0.0, 2.0);
+  RNA_def_property_ui_range(prop, 0.0, 1.0, 10, 3);
   RNA_def_property_ui_text(
       prop,
       "Smooth",
@@ -1366,7 +1367,7 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
   /* Iterations of the Smoothing factor */
   prop = RNA_def_property(srna, "pen_smooth_steps", PROP_INT, PROP_NONE);
   RNA_def_property_int_sdna(prop, NULL, "draw_smoothlvl");
-  RNA_def_property_range(prop, 1, 3);
+  RNA_def_property_range(prop, 0, 100);
   RNA_def_property_ui_text(prop, "Iterations", "Number of times to smooth newly created strokes");
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
   RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, NULL);