Stroke geometry modifiers

Added a set of stroke geometry modifiers to the Geometry tab of line styles
in the Parameter Editor mode.  Now the following stroke geometry modifiers are
available, each with a set of animateable parameters:
- Sampling: changes the resolution of stroke backbone polylines.
- Bezier Curve: replace stroke backbone with a Bezier approximation of the
  stroke backbone.
- Sinus Displacement: add sinus displacement to stroke backbone.
- Spatial Noise: add spatial noise to stroke backbone.
- Perlin Noise 1D: add one-dimensional Perlin noise to stroke backbone.
- Perlin Noise 2D: add two-dimensional Perlin noise to stroke backbone.
- Backbone Stretcher: stretch the beginning and the end of strokes.
- Tip Remover: remove a piece of stroke at the beginning and the end of strokes.

To branch users: When you have a .blend file with Freestyle options specified,
you may want to add a Sampling modifier with the 'sampling' value set to 5.
This value specifies a resolution of polylines for line drawing in Freestyle.
If no sampling modifier is specified, your line drawing will result in coarse
polylines.  Before geometry modifiers were introduced, this initial sampling
was automatically done.  Now the initial sampling is a tunable parameter that
can be omitted, allowing better control on polyline resolution.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_linestyle.h b/source/blender/blenkernel/BKE_linestyle.h
index ebbfe7c5559..ccf8e1c6b30 100644
--- a/source/blender/blenkernel/BKE_linestyle.h
+++ b/source/blender/blenkernel/BKE_linestyle.h
@@ -37,6 +37,7 @@
 #define LS_MODIFIER_TYPE_COLOR      1
 #define LS_MODIFIER_TYPE_ALPHA      2
 #define LS_MODIFIER_TYPE_THICKNESS  3
+#define LS_MODIFIER_TYPE_GEOMETRY   4
 
 struct Main;
 struct Object;
@@ -47,14 +48,17 @@ void FRS_free_linestyle(FreestyleLineStyle *linestyle);
 int FRS_add_linestyle_color_modifier(FreestyleLineStyle *linestyle, int type);
 int FRS_add_linestyle_alpha_modifier(FreestyleLineStyle *linestyle, int type);
 int FRS_add_linestyle_thickness_modifier(FreestyleLineStyle *linestyle, int type);
+int FRS_add_linestyle_geometry_modifier(FreestyleLineStyle *linestyle, int type);
 
 void FRS_remove_linestyle_color_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier);
 void FRS_remove_linestyle_alpha_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier);
 void FRS_remove_linestyle_thickness_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier);
+void FRS_remove_linestyle_geometry_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier);
 
 void FRS_move_linestyle_color_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier, int direction);
 void FRS_move_linestyle_alpha_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier, int direction);
 void FRS_move_linestyle_thickness_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier, int direction);
+void FRS_move_linestyle_geometry_modifier(FreestyleLineStyle *linestyle, LineStyleModifier *modifier, int direction);
 
 void FRS_list_modifier_color_ramps(FreestyleLineStyle *linestyle, ListBase *listbase);
 char *FRS_path_from_ID_to_color_ramp(FreestyleLineStyle *linestyle, ColorBand *color_ramp);