Don't try to statically allocate 2x 8193 pointers

Maximum stack size is only 8KiB, this will try to allocate 8193 *
sizeof(void*) * 2 = 131088 bytes on the stack. This causes a crash in
some cases.

(cherry picked from commit c52f8906266cc9d95b8f609f5e14d4a17e130f94)

servers/visual/visual_server_canvas.cpp

@@ -33,11 +33,9 @@
 #include "visual_server_raster.h"
 #include "visual_server_viewport.h"
 
-void VisualServerCanvas::_render_canvas_item_tree(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate, RasterizerCanvas::Light *p_lights) {
+static const int z_range = VS::CANVAS_ITEM_Z_MAX - VS::CANVAS_ITEM_Z_MIN + 1;
 
-	static const int z_range = VS::CANVAS_ITEM_Z_MAX - VS::CANVAS_ITEM_Z_MIN + 1;
-	RasterizerCanvas::Item *z_list[z_range];
-	RasterizerCanvas::Item *z_last_list[z_range];
+void VisualServerCanvas::_render_canvas_item_tree(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate, RasterizerCanvas::Light *p_lights) {
 
 	memset(z_list, 0, z_range * sizeof(RasterizerCanvas::Item *));
 	memset(z_last_list, 0, z_range * sizeof(RasterizerCanvas::Item *));
@@ -1434,4 +1432,13 @@ bool VisualServerCanvas::free(RID p_rid) {
 }
 
 VisualServerCanvas::VisualServerCanvas() {
+
+	z_list = (RasterizerCanvas::Item **)memalloc(z_range * sizeof(RasterizerCanvas::Item *));
+	z_last_list = (RasterizerCanvas::Item **)memalloc(z_range * sizeof(RasterizerCanvas::Item *));
+}
+
+VisualServerCanvas::~VisualServerCanvas() {
+
+	memfree(z_list);
+	memfree(z_last_list);
 }

servers/visual/visual_server_canvas.h

@@ -155,6 +155,9 @@ private:
 	void _render_canvas_item(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate, int p_z, RasterizerCanvas::Item **z_list, RasterizerCanvas::Item **z_last_list, Item *p_canvas_clip, Item *p_material_owner);
 	void _light_mask_canvas_items(int p_z, RasterizerCanvas::Item *p_canvas_item, RasterizerCanvas::Light *p_masked_lights);
 
+	RasterizerCanvas::Item **z_list;
+	RasterizerCanvas::Item **z_last_list;
+
 public:
 	void render_canvas(Canvas *p_canvas, const Transform2D &p_transform, RasterizerCanvas::Light *p_lights, RasterizerCanvas::Light *p_masked_lights, const Rect2 &p_clip_rect);
 
@@ -247,6 +250,7 @@ public:
 
 	bool free(RID p_rid);
 	VisualServerCanvas();
+	~VisualServerCanvas();
 };
 
 #endif // VISUALSERVERCANVAS_H