diff --git a/dlls/d2d1/d2d1_private.h b/dlls/d2d1/d2d1_private.h
index 2c1025264dd..07f71a0a608 100644
--- a/dlls/d2d1/d2d1_private.h
+++ b/dlls/d2d1/d2d1_private.h
@@ -62,8 +62,8 @@ extern struct d2d_settings d2d_settings DECLSPEC_HIDDEN;
 struct d2d_clip_stack
 {
     D2D1_RECT_F *stack;
-    unsigned int size;
-    unsigned int count;
+    size_t size;
+    size_t count;
 };
 
 struct d2d_error_state
@@ -486,6 +486,32 @@ static inline void *d2d_calloc(size_t count, size_t size)
     return heap_alloc(s);
 }
 
+static inline BOOL d2d_array_reserve(void **elements, size_t *capacity, size_t count, size_t size)
+{
+    size_t new_capacity, max_capacity;
+    void *new_elements;
+
+    if (count <= *capacity)
+        return TRUE;
+
+    max_capacity = ~(SIZE_T)0 / size;
+    if (count > max_capacity)
+        return FALSE;
+
+    new_capacity = max(4, *capacity);
+    while (new_capacity < count && new_capacity <= max_capacity / 2)
+        new_capacity *= 2;
+    if (new_capacity < count)
+        new_capacity = max_capacity;
+
+    if (!(new_elements = heap_realloc(*elements, new_capacity * size)))
+        return FALSE;
+
+    *elements = new_elements;
+    *capacity = new_capacity;
+    return TRUE;
+}
+
 static inline void d2d_matrix_multiply(D2D_MATRIX_3X2_F *a, const D2D_MATRIX_3X2_F *b)
 {
     D2D_MATRIX_3X2_F tmp = *a;
diff --git a/dlls/d2d1/geometry.c b/dlls/d2d1/geometry.c
index c8050849784..4a2f7d7ac85 100644
--- a/dlls/d2d1/geometry.c
+++ b/dlls/d2d1/geometry.c
@@ -562,33 +562,6 @@ static void d2d_rect_get_bezier_segment_bounds(D2D_RECT_F *bounds, const D2D1_PO
     d2d_rect_get_bezier_bounds(bounds, &q[0], &q[1], &q[2]);
 }
 
-static BOOL d2d_array_reserve(void **elements, size_t *capacity, size_t element_count, size_t element_size)
-{
-    size_t new_capacity, max_capacity;
-    void *new_elements;
-
-    if (element_count <= *capacity)
-        return TRUE;
-
-    max_capacity = ~(size_t)0 / element_size;
-    if (max_capacity < element_count)
-        return FALSE;
-
-    new_capacity = max(*capacity, 4);
-    while (new_capacity < element_count && new_capacity <= max_capacity / 2)
-        new_capacity *= 2;
-
-    if (new_capacity < element_count)
-        new_capacity = max_capacity;
-
-    if (!(new_elements = heap_realloc(*elements, new_capacity * element_size)))
-        return FALSE;
-
-    *elements = new_elements;
-    *capacity = new_capacity;
-    return TRUE;
-}
-
 static BOOL d2d_figure_insert_vertex(struct d2d_figure *figure, size_t idx, D2D1_POINT_2F vertex)
 {
     if (!d2d_array_reserve((void **)&figure->vertices, &figure->vertices_size,
diff --git a/dlls/d2d1/render_target.c b/dlls/d2d1/render_target.c
index cc820cf8a98..a202279c7d4 100644
--- a/dlls/d2d1/render_target.c
+++ b/dlls/d2d1/render_target.c
@@ -95,21 +95,8 @@ static BOOL d2d_clip_stack_push(struct d2d_clip_stack *stack, const D2D1_RECT_F
 {
     D2D1_RECT_F r;
 
-    if (stack->count == stack->size)
-    {
-        D2D1_RECT_F *new_stack;
-        unsigned int new_size;
-
-        if (stack->size > UINT_MAX / 2)
-            return FALSE;
-
-        new_size = stack->size * 2;
-        if (!(new_stack = heap_realloc(stack->stack, new_size * sizeof(*stack->stack))))
-            return FALSE;
-
-        stack->stack = new_stack;
-        stack->size = new_size;
-    }
+    if (!d2d_array_reserve((void **)&stack->stack, &stack->size, stack->count + 1, sizeof(*stack->stack)))
+        return FALSE;
 
     r = *rect;
     if (stack->count)