Fix T81380: Playback set start/endframe operators can set negative

rendering range

The Allow Negative Frames option, introduced in rB21a2350248fd, allows
for negative frames, but this should only apply for playback and
animations, the rendering range should still be clamped to MINFRAME /
MAXFRAME, because rendering does not allow for negative frames. Preview
range should not be affected afaict (I am not aware of operators that
allow for rendering this range).

Maniphest Tasks: T81380

Differential Revision: https://developer.blender.org/D9112

1 files changed, 17 insertions, 2 deletions

diff --git a/source/blender/editors/animation/anim_ops.c b/source/blender/editors/animation/anim_ops.c
index 40cd368e02b..b52ff131b43 100644
--- a/source/blender/editors/animation/anim_ops.c
+++ b/source/blender/editors/animation/anim_ops.c
@@ -35,6 +35,7 @@
 #include "BKE_context.h"
 #include "BKE_global.h"
 #include "BKE_main.h"
+#include "BKE_report.h"
 #include "BKE_scene.h"
 #include "BKE_sequencer.h"
 
@@ -299,7 +300,7 @@ static bool anim_set_end_frames_poll(bContext *C)
   return false;
 }
 
-static int anim_set_sfra_exec(bContext *C, wmOperator *UNUSED(op))
+static int anim_set_sfra_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
   int frame;
@@ -315,6 +316,13 @@ static int anim_set_sfra_exec(bContext *C, wmOperator *UNUSED(op))
     scene->r.psfra = frame;
   }
   else {
+    /* Clamping should be in sync with 'rna_Scene_start_frame_set()'. */
+    int frame_clamped = frame;
+    CLAMP(frame_clamped, MINFRAME, MAXFRAME);
+    if (frame_clamped != frame) {
+      BKE_report(op->reports, RPT_WARNING, "Start frame clamped to valid rendering range");
+    }
+    frame = frame_clamped;
     scene->r.sfra = frame;
   }
 
@@ -347,7 +355,7 @@ static void ANIM_OT_start_frame_set(wmOperatorType *ot)
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-static int anim_set_efra_exec(bContext *C, wmOperator *UNUSED(op))
+static int anim_set_efra_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
   int frame;
@@ -363,6 +371,13 @@ static int anim_set_efra_exec(bContext *C, wmOperator *UNUSED(op))
     scene->r.pefra = frame;
   }
   else {
+    /* Clamping should be in sync with 'rna_Scene_end_frame_set()'. */
+    int frame_clamped = frame;
+    CLAMP(frame_clamped, MINFRAME, MAXFRAME);
+    if (frame_clamped != frame) {
+      BKE_report(op->reports, RPT_WARNING, "End frame clamped to valid rendering range");
+    }
+    frame = frame_clamped;
     scene->r.efra = frame;
   }