New freehand curve drawing tool

- Access with Shift-LMB or from the 'Create' toolbar tab.
- Uses curve fitting for bezier curves, with error and corner angle options.
- Optional tablet pressure to curve radius mapping.
- Depth can use the cursor or optionally draw onto the surface,
  for the entire stroke or using the stroke start.
- Stroke plane can optionally be perpendicular to, or aligned to the surface normal.
- Optional radius tapering and for start/end points.
- Supports operator redo and calling from Python.

1 files changed, 36 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index a8f78f6bb34..1ace2b42f15 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1266,6 +1266,40 @@ typedef enum {
 	UNIFIED_PAINT_BRUSH_ALPHA_PRESSURE  = (1 << 4)
 } UnifiedPaintSettingsFlags;
 
+
+typedef struct CurvePaintSettings {
+	char curve_type;
+	char flag;
+	char depth_mode;
+	char surface_plane;
+	int error_threshold;
+	float radius_min, radius_max;
+	float radius_taper_start, radius_taper_end;
+	float radius_offset;
+	float corner_angle;
+} CurvePaintSettings;
+
+/* CurvePaintSettings.flag */
+enum {
+	CURVE_PAINT_FLAG_CORNERS_DETECT             = (1 << 0),
+	CURVE_PAINT_FLAG_PRESSURE_RADIUS            = (1 << 1),
+	CURVE_PAINT_FLAG_DEPTH_STROKE_ENDPOINTS     = (1 << 2),
+};
+
+/* CurvePaintSettings.depth_mode */
+enum {
+	CURVE_PAINT_PROJECT_CURSOR              = 0,
+	CURVE_PAINT_PROJECT_SURFACE             = 1,
+};
+
+/* CurvePaintSettings.surface_plane */
+enum {
+	CURVE_PAINT_SURFACE_PLANE_NORMAL_VIEW           = 0,
+	CURVE_PAINT_SURFACE_PLANE_NORMAL_SURFACE        = 1,
+	CURVE_PAINT_SURFACE_PLANE_VIEW                  = 2,
+};
+
+
 /* *************************************************************** */
 /* Stats */
 
@@ -1417,6 +1451,8 @@ typedef struct ToolSettings {
 	/* Unified Paint Settings */
 	struct UnifiedPaintSettings unified_paint_settings;
 
+	struct CurvePaintSettings curve_paint_settings;
+
 	struct MeshStatVis statvis;
 } ToolSettings;