Fix T79484: Crash when viewing Movie Clip as a Background Image in a Camera

This seems to be caused by a change to the logic of movieclip_get_gputexture_ptr in rB97b597c.

Differential Revision: https://developer.blender.org/D8469

1 files changed, 17 insertions, 13 deletions

diff --git a/source/blender/blenkernel/intern/movieclip.c b/source/blender/blenkernel/intern/movieclip.c
index 04e61df1173..a5bd2ecf68a 100644
--- a/source/blender/blenkernel/intern/movieclip.c
+++ b/source/blender/blenkernel/intern/movieclip.c
@@ -1875,24 +1875,28 @@ static GPUTexture **movieclip_get_gputexture_ptr(MovieClip *clip,
                                                  MovieClipUser *cuser,
                                                  eGPUTextureTarget textarget)
 {
-  LISTBASE_FOREACH (MovieClip_RuntimeGPUTexture *, tex, &clip->runtime.gputextures) {
+  /* Check if we have an existing entry for that clip user. */
+  MovieClip_RuntimeGPUTexture *tex;
+  for (tex = clip->runtime.gputextures.first; tex; tex = tex->next) {
     if (memcmp(&tex->user, cuser, sizeof(MovieClipUser)) == 0) {
-      if (tex == NULL) {
-        tex = (MovieClip_RuntimeGPUTexture *)MEM_mallocN(sizeof(MovieClip_RuntimeGPUTexture),
-                                                         __func__);
+      break;
+    }
+  }
 
-        for (int i = 0; i < TEXTARGET_COUNT; i++) {
-          tex->gputexture[i] = NULL;
-        }
+  /* If not, allocate a new one. */
+  if (tex == NULL) {
+    tex = (MovieClip_RuntimeGPUTexture *)MEM_mallocN(sizeof(MovieClip_RuntimeGPUTexture),
+                                                     __func__);
 
-        memcpy(&tex->user, cuser, sizeof(MovieClipUser));
-        BLI_addtail(&clip->runtime.gputextures, tex);
-      }
-
-      return &tex->gputexture[textarget];
+    for (int i = 0; i < TEXTARGET_COUNT; i++) {
+      tex->gputexture[i] = NULL;
     }
+
+    memcpy(&tex->user, cuser, sizeof(MovieClipUser));
+    BLI_addtail(&clip->runtime.gputextures, tex);
   }
-  return NULL;
+
+  return &tex->gputexture[textarget];
 }
 
 GPUTexture *BKE_movieclip_get_gpu_texture(MovieClip *clip, MovieClipUser *cuser)