Curves: new Grow/Shrink brush

This adds a new Grow/Shrink brush which is similar to the Length
brush in the old hair system.
* It's possible to switch between growing and shrinking by hold
  down ctrl and/or by changing the direction enum.
* 3d brush is supported.
* Different brush falloffs are supported.
* Supports scaling curves uniformly or shrinking/extrapolating
  them. Extrapolation is linear only in this patch.
* A minimum length settings helps to avoid creating zero-sized curves.

Differential Revision: https://developer.blender.org/D14474

1 files changed, 7 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_brush_enums.h b/source/blender/makesdna/DNA_brush_enums.h
index 18d82448d1f..96a97648ac9 100644
--- a/source/blender/makesdna/DNA_brush_enums.h
+++ b/source/blender/makesdna/DNA_brush_enums.h
@@ -461,8 +461,8 @@ typedef enum eBrushCurvesSculptTool {
   CURVES_SCULPT_TOOL_DELETE = 1,
   CURVES_SCULPT_TOOL_SNAKE_HOOK = 2,
   CURVES_SCULPT_TOOL_ADD = 3,
-  CURVES_SCULPT_TOOL_TEST1 = 4,
-  CURVES_SCULPT_TOOL_TEST2 = 5,
+  CURVES_SCULPT_TOOL_GROW_SHRINK = 4,
+  CURVES_SCULPT_TOOL_TEST1 = 5,
 } eBrushCurvesSculptTool;
 
 /** When #BRUSH_ACCUMULATE is used */
@@ -608,6 +608,11 @@ typedef enum eBrushFalloffShape {
   PAINT_FALLOFF_SHAPE_TUBE = 1,
 } eBrushFalloffShape;
 
+typedef enum eBrushCurvesSculptFlag {
+  BRUSH_CURVES_SCULPT_FLAG_SCALE_UNIFORM = (1 << 0),
+  BRUSH_CURVES_SCULPT_FLAG_GROW_SHRINK_INVERT = (1 << 1),
+} eBrushCurvesSculptFlag;
+
 #define MAX_BRUSH_PIXEL_RADIUS 500
 #define GP_MAX_BRUSH_PIXEL_RADIUS 1000