Cleanup: split sequencer.c file

Move most functions into separate files.

File sequencer.c is reserved for alloc, free and duplicating functions.

There should be no functional changes.

source/blender/sequencer/intern/image_cache.h

@@ -0,0 +1,72 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2004 Blender Foundation.
+ * All rights reserved.
+ */
+
+#pragma once
+
+/** \file
+ * \ingroup sequencer
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ImBuf;
+struct Main;
+struct Scene;
+struct Sequence;
+struct SeqRenderData;
+
+#ifdef __cplusplus
+}
+#endif
+
+struct ImBuf *BKE_sequencer_cache_get(const struct SeqRenderData *context,
+                                      struct Sequence *seq,
+                                      float timeline_frame,
+                                      int type,
+                                      bool skip_disk_cache);
+void BKE_sequencer_cache_put(const struct SeqRenderData *context,
+                             struct Sequence *seq,
+                             float timeline_frame,
+                             int type,
+                             struct ImBuf *i,
+                             float cost,
+                             bool skip_disk_cache);
+bool BKE_sequencer_cache_put_if_possible(const struct SeqRenderData *context,
+                                         struct Sequence *seq,
+                                         float timeline_frame,
+                                         int type,
+                                         struct ImBuf *nval,
+                                         float cost,
+                                         bool skip_disk_cache);
+bool BKE_sequencer_cache_recycle_item(struct Scene *scene);
+void BKE_sequencer_cache_free_temp_cache(struct Scene *scene, short id, int timeline_frame);
+void BKE_sequencer_cache_destruct(struct Scene *scene);
+void BKE_sequencer_cache_cleanup_all(struct Main *bmain);
+void BKE_sequencer_cache_cleanup_sequence(struct Scene *scene,
+                                          struct Sequence *seq,
+                                          struct Sequence *seq_changed,
+                                          int invalidate_types,
+                                          bool force_seq_changed_range);
+bool BKE_sequencer_cache_is_full(struct Scene *scene);
+
+#ifdef __cplusplus
+}
+#endif