From d5ffa805b2b372a25badb670cc85ff7aaf29fca6 Mon Sep 17 00:00:00 2001
From: Richard Antalik <richardantalik@gmail.com>
Date: Tue, 21 May 2019 12:29:17 -0700
Subject: VSE: Don't store `cfra` in cache

Strips can move in time. Using cfra may give us erratic results.

Reviewed by: brecht

Differential Revision: https://developer.blender.org/D4898
---
 source/blender/blenkernel/intern/seqcache.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

(limited to 'source/blender/blenkernel/intern/seqcache.c')

diff --git a/source/blender/blenkernel/intern/seqcache.c b/source/blender/blenkernel/intern/seqcache.c
index 1c0aa63f590..f77b3e99e30 100644
--- a/source/blender/blenkernel/intern/seqcache.c
+++ b/source/blender/blenkernel/intern/seqcache.c
@@ -90,7 +90,6 @@ typedef struct SeqCacheKey {
   struct SeqCacheKey *link_next; /* Used for linking intermediate items to final frame */
   struct Sequence *seq;
   SeqRenderData context;
-  float cfra;
   float nfra;
   float cost;
   bool is_temp_cache;
@@ -232,14 +231,17 @@ static SeqCacheKey *seq_cache_choose_key(Scene *scene, SeqCacheKey *lkey, SeqCac
   SeqCacheKey *finalkey = NULL;
 
   if (rkey && lkey) {
-    if (lkey->cfra > rkey->cfra) {
+    int lkey_cfra = lkey->seq->start + lkey->nfra;
+    int rkey_cfra = rkey->seq->start + rkey->nfra;
+
+    if (lkey_cfra > rkey_cfra) {
       SeqCacheKey *swapkey = lkey;
       lkey = rkey;
       rkey = swapkey;
     }
 
-    int l_diff = scene->r.cfra - lkey->cfra;
-    int r_diff = rkey->cfra - scene->r.cfra;
+    int l_diff = scene->r.cfra - lkey_cfra;
+    int r_diff = rkey_cfra - scene->r.cfra;
 
     if (l_diff > r_diff) {
       finalkey = lkey;
@@ -319,7 +321,7 @@ static SeqCacheKey *seq_cache_get_item_for_removal(Scene *scene)
     if (key->cost <= scene->ed->recycle_max_cost) {
       cheap_count++;
       if (lkey) {
-        if (key->cfra < lkey->cfra) {
+        if (key->seq->start + key->nfra < lkey->seq->start + lkey->nfra) {
           lkey = key;
         }
       }
@@ -327,7 +329,7 @@ static SeqCacheKey *seq_cache_get_item_for_removal(Scene *scene)
         lkey = key;
       }
       if (rkey) {
-        if (key->cfra > rkey->cfra) {
+        if (key->seq->start + key->nfra > rkey->seq->start + rkey->nfra) {
           rkey = key;
         }
       }
@@ -425,7 +427,7 @@ void BKE_sequencer_cache_free_temp_cache(Scene *scene, short id, int cfra)
     SeqCacheKey *key = BLI_ghashIterator_getKey(&gh_iter);
     BLI_ghashIterator_step(&gh_iter);
 
-    if (key->is_temp_cache && key->creator_id == id && key->cfra != cfra) {
+    if (key->is_temp_cache && key->creator_id == id && key->seq->start + key->nfra != cfra) {
       BLI_ghash_remove(cache->hash, key, seq_cache_keyfree, seq_cache_valfree);
     }
   }
@@ -592,7 +594,6 @@ void BKE_sequencer_cache_put(
   key->cache_owner = cache;
   key->seq = seq;
   key->context = *context;
-  key->cfra = cfra;
   key->nfra = cfra - seq->start;
   key->type = type;
   key->cost = cost;
@@ -634,7 +635,7 @@ void BKE_sequencer_cache_put(
 void BKE_sequencer_cache_iterate(
     struct Scene *scene,
     void *userdata,
-    bool callback(void *userdata, struct Sequence *seq, int cfra, int cache_type, float cost))
+    bool callback(void *userdata, struct Sequence *seq, int nfra, int cache_type, float cost))
 {
   SeqCache *cache = seq_cache_get_from_scene(scene);
   if (!cache) {
@@ -650,7 +651,7 @@ void BKE_sequencer_cache_iterate(
     SeqCacheKey *key = BLI_ghashIterator_getKey(&gh_iter);
     BLI_ghashIterator_step(&gh_iter);
 
-    interrupt = callback(userdata, key->seq, key->cfra, key->type, key->cost);
+    interrupt = callback(userdata, key->seq, key->nfra, key->type, key->cost);
   }
 
   cache->last_key = NULL;
-- 
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