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Fix T93707: Dragging the tweaked NLA strip causes crash

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Earlier code assumed that the active strip was on the active track. This
commit detects when this assumption doesn't hold, and adds a more thorough
search of the active strip.
This commit is contained in:
Sybren A. Stüvel
2021-12-06 15:48:42 +01:00
parent 0e52af097f
commit b9c6ef4e8f
1 changed files with 47 additions and 17 deletions
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64
source/blender/blenkernel/intern/nla.c
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@@ -61,6 +61,15 @@
static CLG_LogRef LOG = {"bke.nla"};
/**
* Find the active track and strip.
*
* The active strip may or may not be on the active track.
*/
static void nla_tweakmode_find_active(const ListBase /* NlaTrack */ *nla_tracks,
NlaTrack **r_track_of_active_strip,
NlaStrip **r_active_strip);
/* *************************************************** */
/* Data Management */
@@ -309,6 +318,14 @@ static void update_active_track(AnimData *adt_dest, const AnimData *adt_source)
track_dest = track_dest->next;
}
/* If the above assumption failed to hold, do a more thorough search for the active strip. */
if (adt_source->actstrip != NULL && adt_dest->actstrip == NULL) {
nla_tweakmode_find_active(&adt_source->nla_tracks, &track_dest, &adt_dest->actstrip);
}
BLI_assert_msg((adt_source->actstrip == NULL) == (adt_dest->actstrip == NULL),
"Active strip did not copy correctly");
}
void BKE_nla_tracks_copy_from_adt(Main *bmain,
@@ -2086,29 +2103,17 @@ void BKE_nla_action_pushdown(AnimData *adt, const bool is_liboverride)
BKE_nlastrip_set_active(adt, strip);
}
/* Find the active strip + track combo, and set them up as the tweaking track,
* and return if successful or not.
*/
bool BKE_nla_tweakmode_enter(AnimData *adt)
static void nla_tweakmode_find_active(const ListBase /* NlaTrack */ *nla_tracks,
NlaTrack **r_track_of_active_strip,
NlaStrip **r_active_strip)
{
NlaTrack *nlt, *activeTrack = NULL;
NlaStrip *strip, *activeStrip = NULL;
/* verify that data is valid */
if (ELEM(NULL, adt, adt->nla_tracks.first)) {
return false;
}
/* If block is already in tweak-mode, just leave, but we should report
* that this block is in tweak-mode (as our returncode). */
if (adt->flag & ADT_NLA_EDIT_ON) {
return true;
}
/* go over the tracks, finding the active one, and its active strip
* - if we cannot find both, then there's nothing to do
*/
for (nlt = adt->nla_tracks.first; nlt; nlt = nlt->next) {
for (nlt = nla_tracks->first; nlt; nlt = nlt->next) {
/* check if active */
if (nlt->flag & NLATRACK_ACTIVE) {
/* store reference to this active track */
@@ -2127,7 +2132,7 @@ bool BKE_nla_tweakmode_enter(AnimData *adt)
*/
if (activeTrack == NULL) {
/* try last selected track for active strip */
for (nlt = adt->nla_tracks.last; nlt; nlt = nlt->prev) {
for (nlt = nla_tracks->last; nlt; nlt = nlt->prev) {
if (nlt->flag & NLATRACK_SELECTED) {
/* assume this is the active track */
activeTrack = nlt;
@@ -2149,6 +2154,31 @@ bool BKE_nla_tweakmode_enter(AnimData *adt)
}
}
*r_track_of_active_strip = activeTrack;
*r_active_strip = activeStrip;
}
/* Find the active strip + track combo, and set them up as the tweaking track,
* and return if successful or not.
*/
bool BKE_nla_tweakmode_enter(AnimData *adt)
{
NlaTrack *nlt, *activeTrack = NULL;
NlaStrip *strip, *activeStrip = NULL;
/* verify that data is valid */
if (ELEM(NULL, adt, adt->nla_tracks.first)) {
return false;
}
/* If block is already in tweak-mode, just leave, but we should report
* that this block is in tweak-mode (as our returncode). */
if (adt->flag & ADT_NLA_EDIT_ON) {
return true;
}
nla_tweakmode_find_active(&adt->nla_tracks, &activeTrack, &activeStrip);
if (ELEM(NULL, activeTrack, activeStrip, activeStrip->act)) {
if (G.debug & G_DEBUG) {
printf("NLA tweak-mode enter - neither active requirement found\n");