Fix wrong detection of alpha for grayscale images, after recent changes

Differential Revision: https://developer.blender.org/D14286

2 files changed, 5 insertions, 8 deletions

diff --git a/source/blender/blenkernel/BKE_image.h b/source/blender/blenkernel/BKE_image.h
index b3001ecc880..a5a2d57f9d3 100644
--- a/source/blender/blenkernel/BKE_image.h
+++ b/source/blender/blenkernel/BKE_image.h
@@ -371,7 +371,7 @@ void BKE_image_merge(struct Main *bmain, struct Image *dest, struct Image *sourc
 bool BKE_image_scale(struct Image *image, int width, int height);
 
 /**
- * Check if texture has alpha (depth=32).
+ * Check if texture has alpha (planes == 32 || planes == 16).
  */
 bool BKE_image_has_alpha(struct Image *image);
 
diff --git a/source/blender/blenkernel/intern/image.c b/source/blender/blenkernel/intern/image.c
index 8a212ed0d7d..e01f8cb76c8 100644
--- a/source/blender/blenkernel/intern/image.c
+++ b/source/blender/blenkernel/intern/image.c
@@ -5853,17 +5853,14 @@ void BKE_image_user_file_path_ex(ImageUser *iuser, Image *ima, char *filepath, b
   BLI_path_abs(filepath, ID_BLEND_PATH_FROM_GLOBAL(&ima->id));
 }
 
-bool BKE_image_has_alpha(struct Image *image)
+bool BKE_image_has_alpha(Image *image)
 {
-  ImBuf *ibuf;
   void *lock;
-  int planes;
-
-  ibuf = BKE_image_acquire_ibuf(image, NULL, &lock);
-  planes = (ibuf ? ibuf->planes : 0);
+  ImBuf *ibuf = BKE_image_acquire_ibuf(image, NULL, &lock);
+  const int planes = (ibuf ? ibuf->planes : 0);
   BKE_image_release_ibuf(image, ibuf, lock);
 
-  if (planes == 32) {
+  if (planes == 32 || planes == 16) {
     return true;
   }