Fix T64421: crash using redraw timer benchmark

source/blender/windowmanager/intern/wm_draw.c

@@ -917,6 +917,17 @@ void WM_draw_region_free(ARegion *ar)
   ar->visible = 0;
 }
 
+void wm_draw_region_test(bContext *C, ScrArea *sa, ARegion *ar)
+{
+  /* Function for redraw timer benchmark. */
+  bool use_viewport = wm_region_use_viewport(sa, ar);
+  wm_draw_region_buffer_create(ar, false, use_viewport);
+  wm_draw_region_bind(ar, 0);
+  ED_region_do_draw(C, ar);
+  wm_draw_region_unbind(ar, 0);
+  ar->do_draw = false;
+}
+
 void WM_redraw_windows(bContext *C)
 {
   wmWindow *win_prev = CTX_wm_window(C);

source/blender/windowmanager/intern/wm_operators.c

@@ -3085,8 +3085,7 @@ static void redraw_timer_step(bContext *C,
 {
   if (type == eRTDrawRegion) {
     if (ar) {
-      ED_region_do_draw(C, ar);
-      ar->do_draw = false;
+      wm_draw_region_test(C, sa, ar);
     }
   }
   else if (type == eRTDrawRegionSwap) {
@@ -3110,8 +3109,7 @@ static void redraw_timer_step(bContext *C,
       for (ar_iter = sa_iter->regionbase.first; ar_iter; ar_iter = ar_iter->next) {
         if (ar_iter->visible) {
           CTX_wm_region_set(C, ar_iter);
-          ED_region_do_draw(C, ar_iter);
-          ar_iter->do_draw = false;
+          wm_draw_region_test(C, sa_iter, ar_iter);
         }
       }
     }
@@ -3156,6 +3154,7 @@ static int redraw_timer_exec(bContext *C, wmOperator *op)
   wmWindow *win = CTX_wm_window(C);
   ScrArea *sa = CTX_wm_area(C);
   ARegion *ar = CTX_wm_region(C);
+  wmWindowManager *wm = CTX_wm_manager(C);
   double time_start, time_delta;
   const int type = RNA_enum_get(op->ptr, "type");
   const int iter = RNA_int_get(op->ptr, "iterations");
@@ -3169,6 +3168,8 @@ static int redraw_timer_exec(bContext *C, wmOperator *op)
 
   time_start = PIL_check_seconds_timer();
 
+  wm_window_make_drawable(wm, win);
+
   for (a = 0; a < iter; a++) {
     redraw_timer_step(C, bmain, scene, depsgraph, win, sa, ar, type, cfra);
     iter_steps += 1;

source/blender/windowmanager/wm_draw.h

@@ -39,12 +39,14 @@ typedef struct wmDrawBuffer {
 
 struct ARegion;
 struct bContext;
+struct ScrArea;
 struct wmWindow;
 
 /* wm_draw.c */
 void wm_draw_update(struct bContext *C);
 void wm_draw_region_clear(struct wmWindow *win, struct ARegion *ar);
 void wm_draw_region_blend(struct ARegion *ar, int view, bool blend);
+void wm_draw_region_test(struct bContext *C, struct ScrArea *sa, struct ARegion *ar);
 
 struct GPUTexture *wm_draw_region_texture(struct ARegion *ar, int view);