3 files changed, 40 insertions, 0 deletions
diff --git a/source/blender/editors/include/ED_gpencil.h b/source/blender/editors/include/ED_gpencil.h
index d526b0841cc..e53f29ef6b7 100644
--- a/source/blender/editors/include/ED_gpencil.h
+++ b/source/blender/editors/include/ED_gpencil.h
@@ -30,6 +30,8 @@
 #ifndef __ED_GPENCIL_H__
 #define __ED_GPENCIL_H__
 
+#include "ED_numinput.h"
+
 struct ID;
 struct ListBase;
 struct bContext;
@@ -51,6 +53,33 @@ struct wmKeyConfig;
 
 
 /* ------------- Grease-Pencil Helpers ---------------- */
+typedef struct tGPDinterpolate_layer {
+	struct tGPDinterpolate_layer *next, *prev;
+
+	struct bGPDlayer *gpl;            /* layer */
+	struct bGPDframe *prevFrame;      /* frame before current frame (interpolate-from) */
+	struct bGPDframe *nextFrame;      /* frame after current frame (interpolate-to) */
+	struct bGPDframe *interFrame;     /* interpolated frame */
+	float factor;                     /* interpolate factor */
+
+} tGPDinterpolate_layer;
+
+/* Temporary interpolate operation data */
+typedef struct tGPDinterpolate {
+	struct Scene *scene;       /* current scene from context */
+	struct ScrArea *sa;        /* area where painting originated */
+	struct ARegion *ar;        /* region where painting originated */
+	struct bGPdata *gpd;       /* current GP datablock */
+
+	int cframe;                /* current frame number */
+	ListBase ilayers;   /* (tGPDinterpolate_layer) layers to be interpolated */
+	float shift;        /* -1/1 value for determining the displacement influence */
+	int flag;           /* flag from toolsettings */
+
+	NumInput num;       /* numeric input */
+	void *draw_handle_3d; /* handle for drawing strokes while operator is running 3d stuff */
+	void *draw_handle_screen; /* handle for drawing strokes while operator is running screen stuff */
+} tGPDinterpolate;
 
 /* Temporary 'Stroke Point' data 
  *
@@ -118,6 +147,7 @@ void ED_gpencil_draw_view2d(const struct bContext *C, bool onlyv2d);
 void ED_gpencil_draw_view3d(struct wmWindowManager *wm, struct Scene *scene, struct View3D *v3d, struct ARegion *ar, bool only3d);
 void ED_gpencil_draw_ex(struct Scene *scene, struct bGPdata *gpd, int winx, int winy,
                         const int cfra, const char spacetype);
+void ED_gp_draw_interpolation(struct tGPDinterpolate *tgpi, const int type);
 
 /* ----------- Grease-Pencil AnimEdit API ------------------ */
 bool  ED_gplayer_frames_looper(struct bGPDlayer *gpl, struct Scene *scene,
diff --git a/source/blender/editors/include/ED_numinput.h b/source/blender/editors/include/ED_numinput.h
index f9a22429fc2..00558a3a787 100644
--- a/source/blender/editors/include/ED_numinput.h
+++ b/source/blender/editors/include/ED_numinput.h
@@ -30,6 +30,8 @@
 #define NUM_STR_REP_LEN 64
 #define NUM_MAX_ELEMENTS 3
 
+struct wmEvent;
+
 typedef struct NumInput {
 	short  idx_max;                      /* idx_max < NUM_MAX_ELEMENTS */
 	int    unit_sys;
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 1f053c806b0..26a6fdd7d1f 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -393,6 +393,8 @@ struct uiLayout *UI_popup_menu_layout(uiPopupMenu *head);
 void UI_popup_menu_reports(struct bContext *C, struct ReportList *reports) ATTR_NONNULL();
 int UI_popup_menu_invoke(struct bContext *C, const char *idname, struct ReportList *reports) ATTR_NONNULL(1, 2);
 
+void UI_popup_menu_retval_set(const uiBlock *block, const int retval, const bool enable);
+
 /* Pie menus */
 typedef struct uiPieMenu uiPieMenu;
 
@@ -1019,6 +1021,12 @@ void ED_keymap_ui(struct wmKeyConfig *keyconf);
 void UI_drop_color_copy(struct wmDrag *drag, struct wmDropBox *drop);
 int UI_drop_color_poll(struct bContext *C, struct wmDrag *drag, const struct wmEvent *event);
 
+/* UI_OT_space_context_cycle direction */
+enum {
+	SPACE_CONTEXT_CYCLE_PREV,
+	SPACE_CONTEXT_CYCLE_NEXT,
+};
+
 bool UI_context_copy_to_selected_list(
         struct bContext *C, struct PointerRNA *ptr, struct PropertyRNA *prop,
         struct ListBase *r_lb, bool *r_use_path_from_id, char **r_path);