Refactor of proxies build operators

Split proxy build operator into three parts:
- Prepare context (IMB_anim_index_rebuild_context) which prepares all
  needed data and stores it in an anonymous structure used by specific
  builder lately.
- Build proxies/timecodes into temporary files (IMB_anim_index_rebuild)
  This function will build all selected proxies/timecodes into a temporary
  files so old proxies will be still available during building.
- Finish building proxies (IMB_anim_index_rebuild_finish) which copies
  temporary files over old proxies filed and releases all resources used
  by a context.

Context creation and finishing building happens in a main thread so
it's easy and safe to close all opened handles of proxies files and
refresh cache after rebuilding is finished.

This should finally fix #30315: Temporary proxy files are not erased and old proxys are not updated if the proxy is built more then once (windows)

1 files changed, 11 insertions, 4 deletions

diff --git a/source/blender/imbuf/IMB_imbuf.h b/source/blender/imbuf/IMB_imbuf.h
index 5f38142726f..dfd53a145f6 100644
--- a/source/blender/imbuf/IMB_imbuf.h
+++ b/source/blender/imbuf/IMB_imbuf.h
@@ -217,13 +217,19 @@ void IMB_anim_set_index_dir(struct anim * anim, const char * dir);
 int IMB_anim_index_get_frame_index(struct anim * anim, IMB_Timecode_Type tc,
                                    int position);
 
+struct IndexBuildContext;
+
+/* prepare context for proxies/imecodes builder */
+struct IndexBuildContext *IMB_anim_index_rebuild_context(struct anim *anim, IMB_Timecode_Type tcs_in_use,
+                                                         IMB_Proxy_Size proxy_sizes_in_use, int quality);
+
 /* will rebuild all used indices and proxies at once */
-void IMB_anim_index_rebuild(struct anim * anim, 
-                            IMB_Timecode_Type build_tcs,
-                            IMB_Proxy_Size build_preview_sizes,
-                            int build_quality,
+void IMB_anim_index_rebuild(struct IndexBuildContext *context,
                             short *stop, short *do_update, float *progress);
 
+/* finish rebuilding proxises/timecodes and free temporary contexts used */
+void IMB_anim_index_rebuild_finish(struct IndexBuildContext *context, short stop);
+
 /**
  * Return the length (in frames) of the given @a anim.
  */
@@ -243,6 +249,7 @@ int IMB_anim_get_fps(struct anim * anim,
  */
 struct anim *IMB_open_anim(const char *name, int ib_flags, int streamindex);
 void IMB_close_anim(struct anim *anim);
+void IMB_close_anim_proxies(struct anim *anim);
 
 
 /**