Fix T64618: Cycles crash with point density texture on Windows

A better solution would be to not use the callback mechanism anymore for
cases like this where the dependency graph will free volume data, but
that would be a bigger refactor.

1 files changed, 11 insertions, 0 deletions

diff --git a/intern/cycles/render/image.cpp b/intern/cycles/render/image.cpp
index cf1c5fbb446..431e9230cb4 100644
--- a/intern/cycles/render/image.cpp
+++ b/intern/cycles/render/image.cpp
@@ -412,6 +412,17 @@ int ImageManager::add_image(const string &filename,
   return type_index_to_flattened_slot(slot, type);
 }
 
+void ImageManager::add_image_user(int flat_slot)
+{
+  ImageDataType type;
+  int slot = flattened_slot_to_type_index(flat_slot, &type);
+
+  Image *image = images[type][slot];
+  assert(image && image->users >= 1);
+
+  image->users++;
+}
+
 void ImageManager::remove_image(int flat_slot)
 {
   ImageDataType type;