diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index 1f1da35f823..27b519c4355 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -410,11 +410,8 @@ void ED_region_do_draw(bContext *C, ARegion *ar)
 	if (ar->drawrct.xmin == ar->drawrct.xmax)
 		ar->drawrct = ar->winrct;
 	else {
-		/* extra clip for safety (intersect the rects, could use API func) */
-		ar->drawrct.xmin = max_ii(ar->winrct.xmin, ar->drawrct.xmin);
-		ar->drawrct.ymin = max_ii(ar->winrct.ymin, ar->drawrct.ymin);
-		ar->drawrct.xmax = min_ii(ar->winrct.xmax, ar->drawrct.xmax);
-		ar->drawrct.ymax = min_ii(ar->winrct.ymax, ar->drawrct.ymax);
+		/* extra clip for safety */
+		BLI_rcti_isect(&ar->winrct, &ar->drawrct, &ar->drawrct);
 	}
 	
 	/* note; this sets state, so we can use wmOrtho and friends */
diff --git a/source/blender/editors/space_view3d/view3d_draw.c b/source/blender/editors/space_view3d/view3d_draw.c
index 61532e75ee9..2a4ab0a80b8 100644
--- a/source/blender/editors/space_view3d/view3d_draw.c
+++ b/source/blender/editors/space_view3d/view3d_draw.c
@@ -2953,10 +2953,8 @@ bool ED_view3d_calc_render_border(Scene *scene, View3D *v3d, ARegion *ar, rcti *
 		rect->ymax = v3d->render_border.ymax * ar->winy;
 	}
 
-	rect->xmin = CLAMPIS(ar->winrct.xmin + rect->xmin, ar->winrct.xmin, ar->winrct.xmax);
-	rect->ymin = CLAMPIS(ar->winrct.ymin + rect->ymin, ar->winrct.ymin, ar->winrct.ymax);
-	rect->xmax = CLAMPIS(ar->winrct.xmin + rect->xmax, ar->winrct.xmin, ar->winrct.xmax);
-	rect->ymax = CLAMPIS(ar->winrct.ymin + rect->ymax, ar->winrct.ymin, ar->winrct.ymax);
+	BLI_rcti_translate(rect, ar->winrct.xmin, ar->winrct.ymin);
+	BLI_rcti_isect(&ar->winrct, rect, rect);
 
 	return true;
 }