[Bf-blender-cvs] [c98240139e8] blender-v2.83-release: Fix T76470: GPencil sequence interpolate crash when not enough frames in layer

[Antonio Vazquez]

Commit: c98240139e8ebfb5abdcc3734cbd5248cf313644
Author: Antonio Vazquez
Date:   Wed May 6 12:21:53 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rBc98240139e8ebfb5abdcc3734cbd5248cf313644

Fix T76470: GPencil sequence interpolate crash when not enough frames in layer

If try to interpolate a layer without an active a next frame, the interpolation 
failed.

Now, check for both frames before start interpolation.

===================================================================

M       source/blender/editors/gpencil/gpencil_interpolate.c

===================================================================

diff --git a/source/blender/editors/gpencil/gpencil_interpolate.c 
b/source/blender/editors/gpencil/gpencil_interpolate.c
index b6e84205815..5cb49600d05 100644
--- a/source/blender/editors/gpencil/gpencil_interpolate.c
+++ b/source/blender/editors/gpencil/gpencil_interpolate.c
@@ -970,12 +970,16 @@ static int gpencil_interpolate_seq_exec(bContext *C, 
wmOperator *op)
     bGPDstroke *gps_from, *gps_to;
     int cframe, fFrame;
 
+    /* Need a set of frames to interpolate. */
+    if ((gpl->actframe == NULL) || (gpl->actframe->next == NULL)) {
+      continue;
+    }
     /* all layers or only active */
     if (((flag & GP_TOOLFLAG_INTERPOLATE_ALL_LAYERS) == 0) && (gpl != 
active_gpl)) {
       continue;
     }
     /* only editable and visible layers are considered */
-    if (!BKE_gpencil_layer_is_editable(gpl) || (gpl->actframe == NULL)) {
+    if (!BKE_gpencil_layer_is_editable(gpl)) {
       continue;
     }

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