UV: internal changes to picking

Nothing user visible, only things needed for multi-object support,
making picking functions more flexible too.

- Support passing in an initialized hit-struct,
  so it's possible to do multiple nearest calls on the same hit data.
- Replace manhattan distance w/ squared distance
  so they can be compared.
- Return success to detect changes to a hit-data
  which might already be initialized (also more readable).

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_uv.c b/source/blender/editors/sculpt_paint/sculpt_uv.c
index 5ef9d4a6499..7b636530d61 100644
--- a/source/blender/editors/sculpt_paint/sculpt_uv.c
+++ b/source/blender/editors/sculpt_paint/sculpt_uv.c
@@ -650,9 +650,9 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
 		/* we need to find the active island here */
 		if (do_island_optimization) {
 			UvElement *element;
-			NearestHit hit;
+			UvNearestHit hit = UV_NEAREST_HIT_INIT;
 			Image *ima = CTX_data_edit_image(C);
-			uv_find_nearest_vert(scene, ima, em, co, NULL, &hit);
+			uv_find_nearest_vert(scene, ima, em, co, 0.0f, &hit);
 
 			element = BM_uv_element_get(data->elementMap, hit.efa, hit.l);
 			island_index = element->island;