source/blender/draw/engines/overlay/overlay_onion_skin.cc

@@ -21,6 +21,8 @@ void OVERLAY_onion_skin_populate(OVERLAY_Data *vedata, Object *ob)
   OVERLAY_PrivateData *pd = vedata->stl->pd;
   DRWShadingGroup *grp = pd->onion_skin_grp;
 
+  const DRWContextState *draw_ctx = DRW_context_state_get();
+
   float color[3] = {1, 1, 0};
   DRW_shgroup_uniform_vec3_copy(grp, "color", color);
   DRW_shgroup_uniform_float_copy(grp, "alpha", 0.2f);

source/blender/editors/animation/CMakeLists.txt

@@ -29,6 +29,7 @@ set(SRC
   anim_ipo_utils.c
   anim_markers.c
   anim_motion_paths.c
+  anim_onion_skin.c
   anim_ops.c
   drivers.c
   fmodifier_ui.c

source/blender/editors/include/ED_onion_skin.h

@@ -0,0 +1,2 @@
+
+void ED_operatortypes_onion_skin(void);

source/blender/editors/space_api/spacetypes.c

@@ -41,6 +41,7 @@
 #include "ED_mesh.h"
 #include "ED_node.h"
 #include "ED_object.h"
+#include "ED_onion_skin.h"
 #include "ED_paint.h"
 #include "ED_physics.h"
 #include "ED_render.h"
@@ -105,6 +106,7 @@ void ED_spacetypes_init(void)
   ED_operatortypes_curves();
   ED_operatortypes_armature();
   ED_operatortypes_marker();
+  ED_operatortypes_onion_skin();
   ED_operatortypes_metaball();
   ED_operatortypes_sound();
   ED_operatortypes_render();

source/blender/makesdna/DNA_scene_types.h

@@ -1875,6 +1875,11 @@ enum {
 /** \name Scene ID-Block
  * \{ */
 
+typedef struct SceneOnionSkin {
+  SceneOnionSkin *prev, *next;
+  Mesh *mesh;
+} SceneOnionSkin;
+
 typedef struct Scene {
   ID id;
   /** Animation data (must be immediately after id for utilities to use it). */
@@ -1994,6 +1999,7 @@ typedef struct Scene {
   struct SceneDisplay display;
   struct SceneEEVEE eevee;
   struct SceneGpencil grease_pencil_settings;
+  struct ListBase onion_skin_cache /* SceneOnionSkin */;
 } Scene;
 
 /** \} */