Cppcheck report - Godot - branch: 3.x, commit: cd92ad0f69a842d94dc2d56f83cbd8f724ed2959 (2024-12-15): scene/2d/polygon_2d.cpp

/**************************************************************************/
/*  polygon_2d.cpp                                                        */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "polygon_2d.h"

#include "core/math/geometry.h"
#include "skeleton_2d.h"

#ifdef TOOLS_ENABLED
Dictionary Polygon2D::_edit_get_state() const {
	Dictionary state = Node2D::_edit_get_state();
	state["offset"] = offset;
	return state;
}

void Polygon2D::_edit_set_state(const Dictionary &p_state) {
	Node2D::_edit_set_state(p_state);
	set_offset(p_state["offset"]);
}

void Polygon2D::_edit_set_pivot(const Point2 &p_pivot) {
	set_position(get_transform().xform(p_pivot));
	set_offset(get_offset() - p_pivot);
}

Point2 Polygon2D::_edit_get_pivot() const {
	return Vector2();
}

bool Polygon2D::_edit_use_pivot() const {
	return true;
}

Rect2 Polygon2D::_edit_get_rect() const {
	if (rect_cache_dirty) {
		int l = polygon.size();
		PoolVector<Vector2>::Read r = polygon.read();
		item_rect = Rect2();
		for (int i = 0; i < l; i++) {
			Vector2 pos = r[i] + offset;
			if (i == 0) {
				item_rect.position = pos;
			} else {
				item_rect.expand_to(pos);
			}
		}
		rect_cache_dirty = false;
	}

	return item_rect;
}

bool Polygon2D::_edit_use_rect() const {
	return polygon.size() > 0;
}

bool Polygon2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
	Vector<Vector2> polygon2d = Variant(polygon);
	if (internal_vertices > 0) {
		polygon2d.resize(polygon2d.size() - internal_vertices);
	}
	return Geometry::is_point_in_polygon(p_point - get_offset(), polygon2d);
}
#endif

void Polygon2D::_skeleton_bone_setup_changed() {
	update();
}

void Polygon2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			// Must re-establish any existing links with skeletons on re-entering the tree.
			update();
		} break;
		case NOTIFICATION_EXIT_TREE: {
			// Always detach skeleton when exiting the tree, so skeletons don't inform
			// Polygon2Ds outside the tree that they have moved (this would be useless work).
			VS::get_singleton()->canvas_item_attach_skeleton(get_canvas_item(), RID());
		} break;
		case NOTIFICATION_DRAW: {
			if (polygon.size() < 3) {
				return;
			}

			Skeleton2D *skeleton_node = nullptr;
			if (has_node(skeleton)) {
				skeleton_node = Object::cast_to<Skeleton2D>(get_node(skeleton));
			}

			ObjectID new_skeleton_id = 0;

			if (skeleton_node) {
				VS::get_singleton()->canvas_item_attach_skeleton(get_canvas_item(), skeleton_node->get_skeleton());
				new_skeleton_id = skeleton_node->get_instance_id();

				// Sync the offset transform between the Polygon2D and the skeleton.
				// This is needed for accurate culling in VisualServer.
				Transform2D global_xform_skel = skeleton_node->get_global_transform();
				Transform2D global_xform_poly = get_global_transform();

				// find the difference
				Transform2D global_xform_offset = global_xform_skel.affine_inverse() * global_xform_poly;
				VS::get_singleton()->canvas_item_set_skeleton_relative_xform(get_canvas_item(), global_xform_offset);

			} else {
				VS::get_singleton()->canvas_item_attach_skeleton(get_canvas_item(), RID());
			}

			if (new_skeleton_id != current_skeleton_id) {
				Object *old_skeleton = ObjectDB::get_instance(current_skeleton_id);
				if (old_skeleton) {
					old_skeleton->disconnect("bone_setup_changed", this, "_skeleton_bone_setup_changed");
				}

				if (skeleton_node) {
					skeleton_node->connect("bone_setup_changed", this, "_skeleton_bone_setup_changed");
				}

				current_skeleton_id = new_skeleton_id;
			}

			Vector<Vector2> points;
			Vector<Vector2> uvs;
			Vector<int> bones;
			Vector<float> weights;

			int len = polygon.size();
			if ((invert || polygons.size() == 0) && internal_vertices > 0) {
				//if no polygons are around, internal vertices must not be drawn, else let them be
				len -= internal_vertices;
			}

			if (len <= 0) {
				return;
			}
			points.resize(len);

			{
				PoolVector<Vector2>::Read polyr = polygon.read();
				for (int i = 0; i < len; i++) {
					points.write[i] = polyr[i] + offset;
				}
			}

			if (invert) {
				Rect2 bounds;
				int highest_idx = -1;
				float highest_y = -1e20;
				float sum = 0;

				for (int i = 0; i < len; i++) {
					if (i == 0) {
						bounds.position = points[i];
					} else {
						bounds.expand_to(points[i]);
					}
					if (points[i].y > highest_y) {
						highest_idx = i;
						highest_y = points[i].y;
					}
					int ni = (i + 1) % len;
					sum += (points[ni].x - points[i].x) * (points[ni].y + points[i].y);
				}

				bounds = bounds.grow(invert_border);

				Vector2 ep[7] = {
					Vector2(points[highest_idx].x, points[highest_idx].y + invert_border),
					Vector2(bounds.position + bounds.size),
					Vector2(bounds.position + Vector2(bounds.size.x, 0)),
					Vector2(bounds.position),
					Vector2(bounds.position + Vector2(0, bounds.size.y)),
					Vector2(points[highest_idx].x - CMP_EPSILON, points[highest_idx].y + invert_border),
					Vector2(points[highest_idx].x - CMP_EPSILON, points[highest_idx].y),
				};

				if (sum > 0) {
					SWAP(ep[1], ep[4]);
					SWAP(ep[2], ep[3]);
					SWAP(ep[5], ep[0]);
					SWAP(ep[6], points.write[highest_idx]);
				}

				points.resize(points.size() + 7);
				for (int i = points.size() - 1; i >= highest_idx + 7; i--) {
					points.write[i] = points[i - 7];
				}

				for (int i = 0; i < 7; i++) {
					points.write[highest_idx + i + 1] = ep[i];
				}

				len = points.size();
			}

			if (texture.is_valid()) {
				Transform2D texmat(tex_rot, tex_ofs);
				texmat.scale(tex_scale);
				Size2 tex_size = texture->get_size();

				uvs.resize(len);

				if (points.size() == uv.size()) {
					PoolVector<Vector2>::Read uvr = uv.read();

					for (int i = 0; i < len; i++) {
						uvs.write[i] = texmat.xform(uvr[i]) / tex_size;
					}

				} else {
					for (int i = 0; i < len; i++) {
						uvs.write[i] = texmat.xform(points[i]) / tex_size;
					}
				}
			}

			if (skeleton_node && !invert && bone_weights.size()) {
				//a skeleton is set! fill indices and weights
				int vc = len;
				bones.resize(vc * 4);
				weights.resize(vc * 4);

				int *bonesw = bones.ptrw();
				float *weightsw = weights.ptrw();

				for (int i = 0; i < vc * 4; i++) {
					bonesw[i] = 0;
					weightsw[i] = 0;
				}

				for (int i = 0; i < bone_weights.size(); i++) {
					if (bone_weights[i].weights.size() != points.size()) {
						continue; //different number of vertices, sorry not using.
					}
					if (!skeleton_node->has_node(bone_weights[i].path)) {
						continue; //node does not exist
					}
					Bone2D *bone = Object::cast_to<Bone2D>(skeleton_node->get_node(bone_weights[i].path));
					if (!bone) {
						continue;
					}

					int bone_index = bone->get_index_in_skeleton();
					PoolVector<float>::Read r = bone_weights[i].weights.read();
					for (int j = 0; j < vc; j++) {
						if (r[j] == 0.0) {
							continue; //weight is unpainted, skip
						}
						//find an index with a weight
						for (int k = 0; k < 4; k++) {
							if (weightsw[j * 4 + k] < r[j]) {
								//this is less than this weight, insert weight!
								for (int l = 3; l > k; l--) {
									weightsw[j * 4 + l] = weightsw[j * 4 + l - 1];
									bonesw[j * 4 + l] = bonesw[j * 4 + l - 1];
								}
								weightsw[j * 4 + k] = r[j];
								bonesw[j * 4 + k] = bone_index;
								break;
							}
						}
					}
				}

				//normalize the weights
				for (int i = 0; i < vc; i++) {
					float tw = 0;
					for (int j = 0; j < 4; j++) {
						tw += weightsw[i * 4 + j];
					}
					if (tw == 0) {
						continue; //unpainted, do nothing
					}

					//normalize
					for (int j = 0; j < 4; j++) {
						weightsw[i * 4 + j] /= tw;
					}
				}
			}

			Vector<Color> colors;
			if (vertex_colors.size() == points.size()) {
				colors.resize(len);
				PoolVector<Color>::Read color_r = vertex_colors.read();
				for (int i = 0; i < len; i++) {
					colors.write[i] = color_r[i];
				}
			} else {
				colors.push_back(color);
			}

			//			Vector<int> indices = Geometry::triangulate_polygon(points);
			//			VS::get_singleton()->canvas_item_add_triangle_array(get_canvas_item(), indices, points, colors, uvs, texture.is_valid() ? texture->get_rid() : RID());

			if (invert || polygons.size() == 0) {
				Vector<int> indices = Geometry::triangulate_polygon(points);
				if (indices.size()) {
					VS::get_singleton()->canvas_item_add_triangle_array(get_canvas_item(), indices, points, colors, uvs, bones, weights, texture.is_valid() ? texture->get_rid() : RID(), -1, RID(), antialiased);
				}
			} else {
				//draw individual polygons
				Vector<int> total_indices;
				for (int i = 0; i < polygons.size(); i++) {
					PoolVector<int> src_indices = polygons[i];
					int ic = src_indices.size();
					if (ic < 3) {
						continue;
					}
					PoolVector<int>::Read r = src_indices.read();

					Vector<Vector2> tmp_points;
					tmp_points.resize(ic);

					for (int j = 0; j < ic; j++) {
						int idx = r[j];
						ERR_CONTINUE(idx < 0 || idx >= points.size());
						tmp_points.write[j] = points[r[j]];
					}
					Vector<int> indices = Geometry::triangulate_polygon(tmp_points);
					int ic2 = indices.size();
					const int *r2 = indices.ptr();

					int bic = total_indices.size();
					total_indices.resize(bic + ic2);
					int *w2 = total_indices.ptrw();

					for (int j = 0; j < ic2; j++) {
						w2[j + bic] = r[r2[j]];
					}
				}

				if (total_indices.size()) {
					VS::get_singleton()->canvas_item_add_triangle_array(get_canvas_item(), total_indices, points, colors, uvs, bones, weights, texture.is_valid() ? texture->get_rid() : RID(), -1, RID(), antialiased);
				}
			}

		} break;
	}
}

void Polygon2D::set_polygon(const PoolVector<Vector2> &p_polygon) {
	polygon = p_polygon;
	rect_cache_dirty = true;
	update();
}

PoolVector<Vector2> Polygon2D::get_polygon() const {
	return polygon;
}

void Polygon2D::set_internal_vertex_count(int p_count) {
	internal_vertices = p_count;
}

int Polygon2D::get_internal_vertex_count() const {
	return internal_vertices;
}

void Polygon2D::set_uv(const PoolVector<Vector2> &p_uv) {
	uv = p_uv;
	update();
}

PoolVector<Vector2> Polygon2D::get_uv() const {
	return uv;
}

void Polygon2D::set_polygons(const Array &p_polygons) {
	polygons = p_polygons;
	update();
}

Array Polygon2D::get_polygons() const {
	return polygons;
}

void Polygon2D::set_color(const Color &p_color) {
	color = p_color;
	update();
}
Color Polygon2D::get_color() const {
	return color;
}

void Polygon2D::set_vertex_colors(const PoolVector<Color> &p_colors) {
	vertex_colors = p_colors;
	update();
}
PoolVector<Color> Polygon2D::get_vertex_colors() const {
	return vertex_colors;
}

void Polygon2D::set_texture(const Ref<Texture> &p_texture) {
	texture = p_texture;

	/*if (texture.is_valid()) {
		uint32_t flags=texture->get_flags();
		flags&=~Texture::FLAG_REPEAT;
		if (tex_tile)
			flags|=Texture::FLAG_REPEAT;

		texture->set_flags(flags);
	}*/
	update();
}
Ref<Texture> Polygon2D::get_texture() const {
	return texture;
}

void Polygon2D::set_texture_offset(const Vector2 &p_offset) {
	tex_ofs = p_offset;
	update();
}
Vector2 Polygon2D::get_texture_offset() const {
	return tex_ofs;
}

void Polygon2D::set_texture_rotation(float p_rot) {
	tex_rot = p_rot;
	update();
}
float Polygon2D::get_texture_rotation() const {
	return tex_rot;
}

void Polygon2D::set_texture_rotation_degrees(float p_rot) {
	set_texture_rotation(Math::deg2rad(p_rot));
}
float Polygon2D::get_texture_rotation_degrees() const {
	return Math::rad2deg(get_texture_rotation());
}

void Polygon2D::set_texture_scale(const Size2 &p_scale) {
	tex_scale = p_scale;
	update();
}
Size2 Polygon2D::get_texture_scale() const {
	return tex_scale;
}

void Polygon2D::set_invert(bool p_invert) {
	invert = p_invert;
	update();
}
bool Polygon2D::get_invert() const {
	return invert;
}

void Polygon2D::set_antialiased(bool p_antialiased) {
	antialiased = p_antialiased;
	update();
}
bool Polygon2D::get_antialiased() const {
	return antialiased;
}

void Polygon2D::set_invert_border(float p_invert_border) {
	invert_border = p_invert_border;
	update();
}
float Polygon2D::get_invert_border() const {
	return invert_border;
}

void Polygon2D::set_offset(const Vector2 &p_offset) {
	offset = p_offset;
	rect_cache_dirty = true;
	update();
	_change_notify("offset");
}

Vector2 Polygon2D::get_offset() const {
	return offset;
}

void Polygon2D::add_bone(const NodePath &p_path, const PoolVector<float> &p_weights) {
	Bone bone;
	bone.path = p_path;
	bone.weights = p_weights;
	bone_weights.push_back(bone);
}
int Polygon2D::get_bone_count() const {
	return bone_weights.size();
}
NodePath Polygon2D::get_bone_path(int p_index) const {
	ERR_FAIL_INDEX_V(p_index, bone_weights.size(), NodePath());
	return bone_weights[p_index].path;
}
PoolVector<float> Polygon2D::get_bone_weights(int p_index) const {
	ERR_FAIL_INDEX_V(p_index, bone_weights.size(), PoolVector<float>());
	return bone_weights[p_index].weights;
}
void Polygon2D::erase_bone(int p_idx) {
	ERR_FAIL_INDEX(p_idx, bone_weights.size());
	bone_weights.remove(p_idx);
}

void Polygon2D::clear_bones() {
	bone_weights.clear();
}

void Polygon2D::set_bone_weights(int p_index, const PoolVector<float> &p_weights) {
	ERR_FAIL_INDEX(p_index, bone_weights.size());
	bone_weights.write[p_index].weights = p_weights;
	update();
}
void Polygon2D::set_bone_path(int p_index, const NodePath &p_path) {
	ERR_FAIL_INDEX(p_index, bone_weights.size());
	bone_weights.write[p_index].path = p_path;
	update();
}

Array Polygon2D::_get_bones() const {
	Array bones;
	for (int i = 0; i < get_bone_count(); i++) {
		// Convert path property to String to avoid errors due to invalid node path in editor,
		// because it's relative to the Skeleton2D node and not Polygon2D.
		bones.push_back(String(get_bone_path(i)));
		bones.push_back(get_bone_weights(i));
	}
	return bones;
}
void Polygon2D::_set_bones(const Array &p_bones) {
	ERR_FAIL_COND(p_bones.size() & 1);
	clear_bones();
	for (int i = 0; i < p_bones.size(); i += 2) {
		// Convert back from String to NodePath.
		add_bone(NodePath(p_bones[i].operator String()), p_bones[i + 1]);
	}
}

void Polygon2D::set_skeleton(const NodePath &p_skeleton) {
	if (skeleton == p_skeleton) {
		return;
	}
	skeleton = p_skeleton;
	update();
}

NodePath Polygon2D::get_skeleton() const {
	return skeleton;
}

void Polygon2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_polygon", "polygon"), &Polygon2D::set_polygon);
	ClassDB::bind_method(D_METHOD("get_polygon"), &Polygon2D::get_polygon);

	ClassDB::bind_method(D_METHOD("set_uv", "uv"), &Polygon2D::set_uv);
	ClassDB::bind_method(D_METHOD("get_uv"), &Polygon2D::get_uv);

	ClassDB::bind_method(D_METHOD("set_color", "color"), &Polygon2D::set_color);
	ClassDB::bind_method(D_METHOD("get_color"), &Polygon2D::get_color);

	ClassDB::bind_method(D_METHOD("set_polygons", "polygons"), &Polygon2D::set_polygons);
	ClassDB::bind_method(D_METHOD("get_polygons"), &Polygon2D::get_polygons);

	ClassDB::bind_method(D_METHOD("set_vertex_colors", "vertex_colors"), &Polygon2D::set_vertex_colors);
	ClassDB::bind_method(D_METHOD("get_vertex_colors"), &Polygon2D::get_vertex_colors);

	ClassDB::bind_method(D_METHOD("set_texture", "texture"), &Polygon2D::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture"), &Polygon2D::get_texture);

	ClassDB::bind_method(D_METHOD("set_texture_offset", "texture_offset"), &Polygon2D::set_texture_offset);
	ClassDB::bind_method(D_METHOD("get_texture_offset"), &Polygon2D::get_texture_offset);

	ClassDB::bind_method(D_METHOD("set_texture_rotation", "texture_rotation"), &Polygon2D::set_texture_rotation);
	ClassDB::bind_method(D_METHOD("get_texture_rotation"), &Polygon2D::get_texture_rotation);

	ClassDB::bind_method(D_METHOD("set_texture_rotation_degrees", "texture_rotation"), &Polygon2D::set_texture_rotation_degrees);
	ClassDB::bind_method(D_METHOD("get_texture_rotation_degrees"), &Polygon2D::get_texture_rotation_degrees);

	ClassDB::bind_method(D_METHOD("set_texture_scale", "texture_scale"), &Polygon2D::set_texture_scale);
	ClassDB::bind_method(D_METHOD("get_texture_scale"), &Polygon2D::get_texture_scale);

	ClassDB::bind_method(D_METHOD("set_invert", "invert"), &Polygon2D::set_invert);
	ClassDB::bind_method(D_METHOD("get_invert"), &Polygon2D::get_invert);

	ClassDB::bind_method(D_METHOD("set_antialiased", "antialiased"), &Polygon2D::set_antialiased);
	ClassDB::bind_method(D_METHOD("get_antialiased"), &Polygon2D::get_antialiased);

	ClassDB::bind_method(D_METHOD("set_invert_border", "invert_border"), &Polygon2D::set_invert_border);
	ClassDB::bind_method(D_METHOD("get_invert_border"), &Polygon2D::get_invert_border);

	ClassDB::bind_method(D_METHOD("set_offset", "offset"), &Polygon2D::set_offset);
	ClassDB::bind_method(D_METHOD("get_offset"), &Polygon2D::get_offset);

	ClassDB::bind_method(D_METHOD("add_bone", "path", "weights"), &Polygon2D::add_bone);
	ClassDB::bind_method(D_METHOD("get_bone_count"), &Polygon2D::get_bone_count);
	ClassDB::bind_method(D_METHOD("get_bone_path", "index"), &Polygon2D::get_bone_path);
	ClassDB::bind_method(D_METHOD("get_bone_weights", "index"), &Polygon2D::get_bone_weights);
	ClassDB::bind_method(D_METHOD("erase_bone", "index"), &Polygon2D::erase_bone);
	ClassDB::bind_method(D_METHOD("clear_bones"), &Polygon2D::clear_bones);
	ClassDB::bind_method(D_METHOD("set_bone_path", "index", "path"), &Polygon2D::set_bone_path);
	ClassDB::bind_method(D_METHOD("set_bone_weights", "index", "weights"), &Polygon2D::set_bone_weights);

	ClassDB::bind_method(D_METHOD("set_skeleton", "skeleton"), &Polygon2D::set_skeleton);
	ClassDB::bind_method(D_METHOD("get_skeleton"), &Polygon2D::get_skeleton);

	ClassDB::bind_method(D_METHOD("set_internal_vertex_count", "internal_vertex_count"), &Polygon2D::set_internal_vertex_count);
	ClassDB::bind_method(D_METHOD("get_internal_vertex_count"), &Polygon2D::get_internal_vertex_count);

	ClassDB::bind_method(D_METHOD("_set_bones", "bones"), &Polygon2D::_set_bones);
	ClassDB::bind_method(D_METHOD("_get_bones"), &Polygon2D::_get_bones);

	ClassDB::bind_method(D_METHOD("_skeleton_bone_setup_changed"), &Polygon2D::_skeleton_bone_setup_changed);

	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_color", "get_color");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "offset"), "set_offset", "get_offset");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "antialiased"), "set_antialiased", "get_antialiased");

	ADD_GROUP("Texture", "");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_texture", "get_texture");

	ADD_GROUP("Texture", "texture_");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "texture_offset"), "set_texture_offset", "get_texture_offset");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "texture_scale", PROPERTY_HINT_LINK), "set_texture_scale", "get_texture_scale");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "texture_rotation_degrees", PROPERTY_HINT_RANGE, "-360,360,0.1,or_lesser,or_greater"), "set_texture_rotation_degrees", "get_texture_rotation_degrees");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "texture_rotation", PROPERTY_HINT_NONE, "", 0), "set_texture_rotation", "get_texture_rotation");

	ADD_GROUP("Skeleton", "");
	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "skeleton", PROPERTY_HINT_NODE_PATH_VALID_TYPES, "Skeleton2D"), "set_skeleton", "get_skeleton");

	ADD_GROUP("Invert", "invert_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "invert_enable"), "set_invert", "get_invert");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "invert_border", PROPERTY_HINT_RANGE, "0.1,16384,0.1"), "set_invert_border", "get_invert_border");

	ADD_GROUP("Data", "");
	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "polygon"), "set_polygon", "get_polygon");
	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "uv"), "set_uv", "get_uv");
	ADD_PROPERTY(PropertyInfo(Variant::POOL_COLOR_ARRAY, "vertex_colors"), "set_vertex_colors", "get_vertex_colors");
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "polygons"), "set_polygons", "get_polygons");
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "bones", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "_set_bones", "_get_bones");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "internal_vertex_count", PROPERTY_HINT_RANGE, "0,1000"), "set_internal_vertex_count", "get_internal_vertex_count");
}

Polygon2D::Polygon2D() {
	invert = false;
	invert_border = 100;
	antialiased = false;
	tex_rot = 0;
	tex_tile = true;
	tex_scale = Vector2(1, 1);
<--- Variable 'tex_scale' is assigned in constructor body. Consider performing initialization in initialization list. [+]
When an object of a class is created, the constructors of all member variables are called consecutively in the order the variables are declared, even if you don't explicitly write them to the initialization list. You could avoid assigning 'tex_scale' a value by passing the value to the constructor in the initialization list.
	color = Color(1, 1, 1);
	rect_cache_dirty = true;
	internal_vertices = 0;
	current_skeleton_id = 0;
}

Polygon2D::~Polygon2D() {
	// Most definitely don't want to leave references to this deleted canvas item
	// in the skeleton.
	if (get_canvas_item().is_valid()) {
		VS::get_singleton()->canvas_item_attach_skeleton(get_canvas_item(), RID());
	}
}