Sequencer display overlay option, this can show a border area from another time to help compare for color grading.

- Okey sets the border in the display.
- Okey resets the frame offset in the sequencer timeline.
- ghost icon in the header can enable/disable.
- frame offset can be relative or absolute (lock icon)

Not very happy that this commit adds a call to BKE_animsys_evaluate_animdata(scene, ...) in do_build_seq_array_recursively()
without this the offset frames dont have fcurves applied.
Though we will need something like this for prefetch frames to work too.

1 files changed, 65 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_sequencer.c b/source/blender/makesrna/intern/rna_sequencer.c
index c8b7299b539..0c60f04c2c2 100644
--- a/source/blender/makesrna/intern/rna_sequencer.c
+++ b/source/blender/makesrna/intern/rna_sequencer.c
@@ -521,6 +521,55 @@ static char *rna_SequenceColorBalance_path(PointerRNA *ptr)
 		return BLI_strdup("");
 }
 
+static void rna_SequenceEditor_overlay_lock_set(PointerRNA *ptr, int value)
+{
+	Scene *scene= ptr->id.data;
+	Editing *ed= seq_give_editing(scene, FALSE);
+
+	if(ed==NULL)
+		return;
+
+	/* convert from abs to relative and back */
+	if((ed->over_flag & SEQ_EDIT_OVERLAY_ABS)==0 && value) {
+		ed->over_cfra= scene->r.cfra + ed->over_ofs;
+		ed->over_flag |= SEQ_EDIT_OVERLAY_ABS;
+	}
+	else if((ed->over_flag & SEQ_EDIT_OVERLAY_ABS) && !value) {
+		ed->over_ofs= ed->over_cfra - scene->r.cfra;
+		ed->over_flag &= ~SEQ_EDIT_OVERLAY_ABS;
+	}
+}
+
+static int rna_SequenceEditor_overlay_frame_get(PointerRNA *ptr)
+{
+	Scene *scene= (Scene *)ptr->id.data;
+	Editing *ed= seq_give_editing(scene, FALSE);
+
+	if(ed==NULL)
+		return scene->r.cfra;
+
+	if(ed->over_flag & SEQ_EDIT_OVERLAY_ABS)
+		return ed->over_cfra - scene->r.cfra;
+	else
+		return ed->over_ofs;
+
+}
+
+static void rna_SequenceEditor_overlay_frame_set(PointerRNA *ptr, int value)
+{
+	Scene *scene= (Scene *)ptr->id.data;
+	Editing *ed= seq_give_editing(scene, FALSE);
+
+	if(ed==NULL)
+		return;
+
+
+	if(ed->over_flag & SEQ_EDIT_OVERLAY_ABS)
+		ed->over_cfra= (scene->r.cfra + value);
+	else
+		ed->over_ofs= value;
+}
+
 #else
 
 static void rna_def_strip_element(BlenderRNA *brna)
@@ -887,6 +936,22 @@ static void rna_def_editor(BlenderRNA *brna)
 	RNA_def_property_pointer_sdna(prop, NULL, "act_seq");
 	RNA_def_property_flag(prop, PROP_EDITABLE);
 
+	prop= RNA_def_property(srna, "show_overlay", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "over_flag", SEQ_EDIT_OVERLAY_SHOW);
+	RNA_def_property_ui_text(prop, "Draw Axes", "Partial overlay ontop of the sequencer");
+	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_SEQUENCER, NULL);
+
+	prop= RNA_def_property(srna, "overlay_lock", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "over_flag", SEQ_EDIT_OVERLAY_ABS);
+	RNA_def_property_ui_text(prop, "Overlay Lock", "");
+	RNA_def_property_boolean_funcs(prop, NULL, "rna_SequenceEditor_overlay_lock_set");
+	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_SEQUENCER, NULL);
+
+	/* access to fixed and relative frame */
+	prop= RNA_def_property(srna, "overlay_frame", PROP_INT, PROP_NONE);
+	RNA_def_property_ui_text(prop, "Overlay Offset", "");
+	RNA_def_property_int_funcs(prop, "rna_SequenceEditor_overlay_frame_get", "rna_SequenceEditor_overlay_frame_set", NULL);
+	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_SEQUENCER, NULL);
 	RNA_def_property_ui_text(prop, "Active Strip", "Sequencers active strip");
 }