Commit: 8a288953cc1dfa2b6e03b3cce31083399a451ba6
Author: Bastien Montagne
Date:   Fri Jan 2 22:49:00 2015 +0100
Branches: master
https://developer.blender.org/rB8a288953cc1dfa2b6e03b3cce31083399a451ba6

Fix RNA Image.frame_duration.

If a video was loaded (e.g. from python) but never 'ibuf-acquired', its 
Image->anim
prop would still be NULL, returning useless '1' value as frame duration!

===================================================================

M       source/blender/makesrna/intern/rna_image.c

===================================================================

diff --git a/source/blender/makesrna/intern/rna_image.c 
b/source/blender/makesrna/intern/rna_image.c
index 141de51..397e03a 100644
--- a/source/blender/makesrna/intern/rna_image.c
+++ b/source/blender/makesrna/intern/rna_image.c
@@ -292,11 +292,21 @@ static int rna_Image_depth_get(PointerRNA *ptr)
 
 static int rna_Image_frame_duration_get(PointerRNA *ptr)
 {
-       Image *im = (Image *)ptr->data;
+       Image *ima = ptr->id.data;
+       int duration = 1;
+
+       if (!ima->anim) {
+               /* acquire ensures ima->anim is set, if possible! */
+               void *lock;
+               ImBuf *ibuf = BKE_image_acquire_ibuf(ima, NULL, &lock);
+               BKE_image_release_ibuf(ima, ibuf, lock);
+       }
+
+       if (ima->anim) {
+               duration = IMB_anim_get_duration(ima->anim, IMB_TC_RECORD_RUN);
+       }
 
-       if (im->anim)
-               return IMB_anim_get_duration(im->anim, IMB_TC_RECORD_RUN);
-       return 1;
+       return duration;
 }
 
 static int rna_Image_pixels_get_length(PointerRNA *ptr, int 
length[RNA_MAX_ARRAY_DIMENSION])

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