Cleanup: Use const in curves sculpt code

This makes it much clearer what data is supposed to be modified
and what data is just used to influence the operation. The new
`BKE_paint_brush_for_read` function isn't great design, but it
can be removed or renamed if similar changes are applied to
more places.

Also pass pointers explicitly to `sample_curves_3d_brush` rather
than reusing the `bContext`. This makes it clearer what data the
function actually needs.

Differential Revision: https://developer.blender.org/D14967

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index 03cbcf575c3..c39ab22ce3a 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -180,6 +180,7 @@ struct Paint *BKE_paint_get_active_from_context(const struct bContext *C);
 ePaintMode BKE_paintmode_get_active_from_context(const struct bContext *C);
 ePaintMode BKE_paintmode_get_from_tool(const struct bToolRef *tref);
 struct Brush *BKE_paint_brush(struct Paint *paint);
+const struct Brush *BKE_paint_brush_for_read(const struct Paint *p);
 void BKE_paint_brush_set(struct Paint *paint, struct Brush *br);
 struct Palette *BKE_paint_palette(struct Paint *paint);
 void BKE_paint_palette_set(struct Paint *p, struct Palette *palette);