Cleanup: Use const when retrieving custom data layers

Knowing when layers are retrieved for write access will be essential
when adding proper copy-on-write support. This commit makes that
clearer by adding `const` where the retrieved data is not modified.

Ref T95842

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/pbvh_pixels.cc b/source/blender/blenkernel/intern/pbvh_pixels.cc
index 8b3fcffd9cd..40742ad36d5 100644
--- a/source/blender/blenkernel/intern/pbvh_pixels.cc
+++ b/source/blender/blenkernel/intern/pbvh_pixels.cc
@@ -108,7 +108,7 @@ struct EncodePixelsUserData {
   ImageUser *image_user;
   PBVH *pbvh;
   Vector<PBVHNode *> *nodes;
-  MLoopUV *ldata_uv;
+  const MLoopUV *ldata_uv;
 };
 
 static void do_encode_pixels(void *__restrict userdata,
@@ -283,7 +283,8 @@ static void update_pixels(PBVH *pbvh, Mesh *mesh, Image *image, ImageUser *image
     return;
   }
 
-  MLoopUV *ldata_uv = static_cast<MLoopUV *>(CustomData_get_layer(&mesh->ldata, CD_MLOOPUV));
+  const MLoopUV *ldata_uv = static_cast<const MLoopUV *>(
+      CustomData_get_layer(&mesh->ldata, CD_MLOOPUV));
   if (ldata_uv == nullptr) {
     return;
   }