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

/**************************************************************************/
/*  style_box.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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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/**************************************************************************/

#include "style_box.h"
#include "scene/2d/canvas_item.h"

#include <limits.h>

bool StyleBox::test_mask(const Point2 &p_point, const Rect2 &p_rect) const {
	return true;
}

void StyleBox::set_default_margin(Margin p_margin, float p_value) {
	ERR_FAIL_INDEX((int)p_margin, 4);

	margin[p_margin] = p_value;
	emit_changed();
}
float StyleBox::get_default_margin(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0.0);

	return margin[p_margin];
}

float StyleBox::get_margin(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0.0);

	if (margin[p_margin] < 0) {
		return get_style_margin(p_margin);
	} else {
		return margin[p_margin];
	}
}

CanvasItem *StyleBox::get_current_item_drawn() const {
	return CanvasItem::get_current_item_drawn();
}

Size2 StyleBox::get_minimum_size() const {
	return Size2(get_margin(MARGIN_LEFT) + get_margin(MARGIN_RIGHT), get_margin(MARGIN_TOP) + get_margin(MARGIN_BOTTOM));
}

Point2 StyleBox::get_offset() const {
	return Point2(get_margin(MARGIN_LEFT), get_margin(MARGIN_TOP));
}

Size2 StyleBox::get_center_size() const {
	return Size2();
}

Rect2 StyleBox::get_draw_rect(const Rect2 &p_rect) const {
	return p_rect;
}

void StyleBox::_bind_methods() {
	ClassDB::bind_method(D_METHOD("test_mask", "point", "rect"), &StyleBox::test_mask);

	ClassDB::bind_method(D_METHOD("set_default_margin", "margin", "offset"), &StyleBox::set_default_margin);
	ClassDB::bind_method(D_METHOD("get_default_margin", "margin"), &StyleBox::get_default_margin);

	ClassDB::bind_method(D_METHOD("get_margin", "margin"), &StyleBox::get_margin);
	ClassDB::bind_method(D_METHOD("get_minimum_size"), &StyleBox::get_minimum_size);
	ClassDB::bind_method(D_METHOD("get_center_size"), &StyleBox::get_center_size);
	ClassDB::bind_method(D_METHOD("get_offset"), &StyleBox::get_offset);
	ClassDB::bind_method(D_METHOD("get_current_item_drawn"), &StyleBox::get_current_item_drawn);

	ClassDB::bind_method(D_METHOD("draw", "canvas_item", "rect"), &StyleBox::draw);

	ADD_GROUP("Content Margin", "content_margin_");
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "content_margin_left", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", MARGIN_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "content_margin_right", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", MARGIN_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "content_margin_top", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", MARGIN_TOP);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "content_margin_bottom", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", MARGIN_BOTTOM);
}

StyleBox::StyleBox() {
	for (int i = 0; i < 4; i++) {
		margin[i] = -1;
	}
}

void StyleBoxTexture::set_texture(Ref<Texture> p_texture) {
	if (texture == p_texture) {
		return;
	}
	texture = p_texture;
	if (p_texture.is_null()) {
		region_rect = Rect2(0, 0, 0, 0);
	} else {
		region_rect = Rect2(Point2(), texture->get_size());
	}
	emit_signal("texture_changed");
	emit_changed();
	_change_notify("texture");
}

Ref<Texture> StyleBoxTexture::get_texture() const {
	return texture;
}

void StyleBoxTexture::set_normal_map(Ref<Texture> p_normal_map) {
	if (normal_map == p_normal_map) {
		return;
	}
	normal_map = p_normal_map;
	emit_changed();
}

Ref<Texture> StyleBoxTexture::get_normal_map() const {
	return normal_map;
}

void StyleBoxTexture::set_margin_size(Margin p_margin, float p_size) {
	ERR_FAIL_INDEX((int)p_margin, 4);

	margin[p_margin] = p_size;
	emit_changed();
	static const char *margin_prop[4] = {
		"content_margin_left",
		"content_margin_top",
		"content_margin_right",
		"content_margin_bottom",
	};
	_change_notify(margin_prop[p_margin]);
}
float StyleBoxTexture::get_margin_size(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0.0);

	return margin[p_margin];
}

float StyleBoxTexture::get_style_margin(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0.0);

	return margin[p_margin];
}

Rect2 StyleBoxTexture::get_draw_rect(const Rect2 &p_rect) const {
	return p_rect.grow_individual(expand_margin[MARGIN_LEFT], expand_margin[MARGIN_TOP], expand_margin[MARGIN_RIGHT], expand_margin[MARGIN_BOTTOM]);
}

void StyleBoxTexture::draw(RID p_canvas_item, const Rect2 &p_rect) const {
	if (texture.is_null()) {
		return;
	}

	Rect2 rect = p_rect;
	Rect2 src_rect = region_rect;

	texture->get_rect_region(rect, src_rect, rect, src_rect);

	rect.position.x -= expand_margin[MARGIN_LEFT];
	rect.position.y -= expand_margin[MARGIN_TOP];
	rect.size.x += expand_margin[MARGIN_LEFT] + expand_margin[MARGIN_RIGHT];
	rect.size.y += expand_margin[MARGIN_TOP] + expand_margin[MARGIN_BOTTOM];

	RID normal_rid;
	if (normal_map.is_valid()) {
		normal_rid = normal_map->get_rid();
	}

	VisualServer::get_singleton()->canvas_item_add_nine_patch(p_canvas_item, rect, src_rect, texture->get_rid(), Vector2(margin[MARGIN_LEFT], margin[MARGIN_TOP]), Vector2(margin[MARGIN_RIGHT], margin[MARGIN_BOTTOM]), VS::NinePatchAxisMode(axis_h), VS::NinePatchAxisMode(axis_v), draw_center, modulate, normal_rid);
}

void StyleBoxTexture::set_draw_center(bool p_enabled) {
	draw_center = p_enabled;
	emit_changed();
}

bool StyleBoxTexture::is_draw_center_enabled() const {
	return draw_center;
}

Size2 StyleBoxTexture::get_center_size() const {
	if (texture.is_null()) {
		return Size2();
	}

	return region_rect.size - get_minimum_size();
}

void StyleBoxTexture::set_expand_margin_size(Margin p_expand_margin, float p_size) {
	ERR_FAIL_INDEX((int)p_expand_margin, 4);
	expand_margin[p_expand_margin] = p_size;
	emit_changed();
}

void StyleBoxTexture::set_expand_margin_size_individual(float p_left, float p_top, float p_right, float p_bottom) {
	expand_margin[MARGIN_LEFT] = p_left;
	expand_margin[MARGIN_TOP] = p_top;
	expand_margin[MARGIN_RIGHT] = p_right;
	expand_margin[MARGIN_BOTTOM] = p_bottom;
	emit_changed();
}

void StyleBoxTexture::set_expand_margin_size_all(float p_expand_margin_size) {
	for (int i = 0; i < 4; i++) {
		expand_margin[i] = p_expand_margin_size;
	}
	emit_changed();
}

float StyleBoxTexture::get_expand_margin_size(Margin p_expand_margin) const {
	ERR_FAIL_INDEX_V((int)p_expand_margin, 4, 0);
	return expand_margin[p_expand_margin];
}

void StyleBoxTexture::set_region_rect(const Rect2 &p_region_rect) {
	if (region_rect == p_region_rect) {
		return;
	}

	region_rect = p_region_rect;
	emit_changed();
	_change_notify("region");
}

Rect2 StyleBoxTexture::get_region_rect() const {
	return region_rect;
}

void StyleBoxTexture::set_h_axis_stretch_mode(AxisStretchMode p_mode) {
	ERR_FAIL_INDEX((int)p_mode, 3);
	axis_h = p_mode;
	emit_changed();
}

StyleBoxTexture::AxisStretchMode StyleBoxTexture::get_h_axis_stretch_mode() const {
	return axis_h;
}

void StyleBoxTexture::set_v_axis_stretch_mode(AxisStretchMode p_mode) {
	ERR_FAIL_INDEX((int)p_mode, 3);
	axis_v = p_mode;
	emit_changed();
}

StyleBoxTexture::AxisStretchMode StyleBoxTexture::get_v_axis_stretch_mode() const {
	return axis_v;
}

void StyleBoxTexture::set_modulate(const Color &p_modulate) {
	if (modulate == p_modulate) {
		return;
	}
	modulate = p_modulate;
	emit_changed();
}

Color StyleBoxTexture::get_modulate() const {
	return modulate;
}

void StyleBoxTexture::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_texture", "texture"), &StyleBoxTexture::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture"), &StyleBoxTexture::get_texture);

	ClassDB::bind_method(D_METHOD("set_normal_map", "normal_map"), &StyleBoxTexture::set_normal_map);
	ClassDB::bind_method(D_METHOD("get_normal_map"), &StyleBoxTexture::get_normal_map);

	ClassDB::bind_method(D_METHOD("set_margin_size", "margin", "size"), &StyleBoxTexture::set_margin_size);
	ClassDB::bind_method(D_METHOD("get_margin_size", "margin"), &StyleBoxTexture::get_margin_size);

	ClassDB::bind_method(D_METHOD("set_expand_margin_size", "margin", "size"), &StyleBoxTexture::set_expand_margin_size);
	ClassDB::bind_method(D_METHOD("set_expand_margin_all", "size"), &StyleBoxTexture::set_expand_margin_size_all);
	ClassDB::bind_method(D_METHOD("set_expand_margin_individual", "size_left", "size_top", "size_right", "size_bottom"), &StyleBoxTexture::set_expand_margin_size_individual);
	ClassDB::bind_method(D_METHOD("get_expand_margin_size", "margin"), &StyleBoxTexture::get_expand_margin_size);

	ClassDB::bind_method(D_METHOD("set_region_rect", "region"), &StyleBoxTexture::set_region_rect);
	ClassDB::bind_method(D_METHOD("get_region_rect"), &StyleBoxTexture::get_region_rect);

	ClassDB::bind_method(D_METHOD("set_draw_center", "enable"), &StyleBoxTexture::set_draw_center);
	ClassDB::bind_method(D_METHOD("is_draw_center_enabled"), &StyleBoxTexture::is_draw_center_enabled);

	ClassDB::bind_method(D_METHOD("set_modulate", "color"), &StyleBoxTexture::set_modulate);
	ClassDB::bind_method(D_METHOD("get_modulate"), &StyleBoxTexture::get_modulate);

	ClassDB::bind_method(D_METHOD("set_h_axis_stretch_mode", "mode"), &StyleBoxTexture::set_h_axis_stretch_mode);
	ClassDB::bind_method(D_METHOD("get_h_axis_stretch_mode"), &StyleBoxTexture::get_h_axis_stretch_mode);

	ClassDB::bind_method(D_METHOD("set_v_axis_stretch_mode", "mode"), &StyleBoxTexture::set_v_axis_stretch_mode);
	ClassDB::bind_method(D_METHOD("get_v_axis_stretch_mode"), &StyleBoxTexture::get_v_axis_stretch_mode);

	ADD_SIGNAL(MethodInfo("texture_changed"));

	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_texture", "get_texture");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "normal_map", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_normal_map", "get_normal_map");
	ADD_PROPERTY(PropertyInfo(Variant::RECT2, "region_rect"), "set_region_rect", "get_region_rect");
	ADD_GROUP("Margin", "margin_");
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "margin_left", PROPERTY_HINT_RANGE, "0,2048,1"), "set_margin_size", "get_margin_size", MARGIN_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "margin_right", PROPERTY_HINT_RANGE, "0,2048,1"), "set_margin_size", "get_margin_size", MARGIN_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "margin_top", PROPERTY_HINT_RANGE, "0,2048,1"), "set_margin_size", "get_margin_size", MARGIN_TOP);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "margin_bottom", PROPERTY_HINT_RANGE, "0,2048,1"), "set_margin_size", "get_margin_size", MARGIN_BOTTOM);
	ADD_GROUP("Expand Margin", "expand_margin_");
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_left", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin_size", "get_expand_margin_size", MARGIN_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_right", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin_size", "get_expand_margin_size", MARGIN_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_top", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin_size", "get_expand_margin_size", MARGIN_TOP);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_bottom", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin_size", "get_expand_margin_size", MARGIN_BOTTOM);
	ADD_GROUP("Axis Stretch", "axis_stretch_");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "axis_stretch_horizontal", PROPERTY_HINT_ENUM, "Stretch,Tile,Tile Fit"), "set_h_axis_stretch_mode", "get_h_axis_stretch_mode");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "axis_stretch_vertical", PROPERTY_HINT_ENUM, "Stretch,Tile,Tile Fit"), "set_v_axis_stretch_mode", "get_v_axis_stretch_mode");
	ADD_GROUP("Modulate", "modulate_");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "modulate_color"), "set_modulate", "get_modulate");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "draw_center"), "set_draw_center", "is_draw_center_enabled");

	BIND_ENUM_CONSTANT(AXIS_STRETCH_MODE_STRETCH);
	BIND_ENUM_CONSTANT(AXIS_STRETCH_MODE_TILE);
	BIND_ENUM_CONSTANT(AXIS_STRETCH_MODE_TILE_FIT);
}

StyleBoxTexture::StyleBoxTexture() {
	for (int i = 0; i < 4; i++) {
		margin[i] = 0;
		expand_margin[i] = 0;
	}
	draw_center = true;
	modulate = Color(1, 1, 1, 1);

	axis_h = AXIS_STRETCH_MODE_STRETCH;
	axis_v = AXIS_STRETCH_MODE_STRETCH;
}
StyleBoxTexture::~StyleBoxTexture() {
}

////////////////

void StyleBoxFlat::set_bg_color(const Color &p_color) {
	bg_color = p_color;
	emit_changed();
}

Color StyleBoxFlat::get_bg_color() const {
	return bg_color;
}

void StyleBoxFlat::set_border_color(const Color &p_color) {
	border_color = p_color;
	emit_changed();
}
Color StyleBoxFlat::get_border_color() const {
	return border_color;
}

void StyleBoxFlat::set_border_width_all(int p_size) {
	border_width[0] = p_size;
	border_width[1] = p_size;
	border_width[2] = p_size;
	border_width[3] = p_size;
	emit_changed();
}
int StyleBoxFlat::get_border_width_min() const {
	return MIN(MIN(border_width[0], border_width[1]), MIN(border_width[2], border_width[3]));
}

void StyleBoxFlat::set_border_width(Margin p_margin, int p_width) {
	ERR_FAIL_INDEX((int)p_margin, 4);
	border_width[p_margin] = p_width;
	emit_changed();
}

int StyleBoxFlat::get_border_width(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0);
	return border_width[p_margin];
}

void StyleBoxFlat::set_border_blend(bool p_blend) {
	blend_border = p_blend;
	emit_changed();
}
bool StyleBoxFlat::get_border_blend() const {
	return blend_border;
}

void StyleBoxFlat::set_corner_radius_all(int radius) {
	for (int i = 0; i < 4; i++) {
		corner_radius[i] = radius;
	}

	emit_changed();
}
void StyleBoxFlat::set_corner_radius_individual(const int radius_top_left, const int radius_top_right, const int radius_bottom_right, const int radius_bottom_left) {
	corner_radius[0] = radius_top_left;
	corner_radius[1] = radius_top_right;
	corner_radius[2] = radius_bottom_right;
	corner_radius[3] = radius_bottom_left;

	emit_changed();
}
int StyleBoxFlat::get_corner_radius_min() const {
	int smallest = corner_radius[0];
	for (int i = 1; i < 4; i++) {
		if (smallest > corner_radius[i]) {
			smallest = corner_radius[i];
		}
	}
	return smallest;
}

void StyleBoxFlat::set_corner_radius(const Corner p_corner, const int radius) {
	ERR_FAIL_INDEX((int)p_corner, 4);
	corner_radius[p_corner] = radius;
	emit_changed();
}
int StyleBoxFlat::get_corner_radius(const Corner p_corner) const {
	ERR_FAIL_INDEX_V((int)p_corner, 4, 0);
	return corner_radius[p_corner];
}

void StyleBoxFlat::set_expand_margin_size(Margin p_expand_margin, float p_size) {
	ERR_FAIL_INDEX((int)p_expand_margin, 4);
	expand_margin[p_expand_margin] = p_size;
	emit_changed();
}

void StyleBoxFlat::set_expand_margin_size_individual(float p_left, float p_top, float p_right, float p_bottom) {
	expand_margin[MARGIN_LEFT] = p_left;
	expand_margin[MARGIN_TOP] = p_top;
	expand_margin[MARGIN_RIGHT] = p_right;
	expand_margin[MARGIN_BOTTOM] = p_bottom;
	emit_changed();
}

void StyleBoxFlat::set_expand_margin_size_all(float p_expand_margin_size) {
	for (int i = 0; i < 4; i++) {
		expand_margin[i] = p_expand_margin_size;
	}
	emit_changed();
}

float StyleBoxFlat::get_expand_margin_size(Margin p_expand_margin) const {
	ERR_FAIL_INDEX_V((int)p_expand_margin, 4, 0.0);
	return expand_margin[p_expand_margin];
}
void StyleBoxFlat::set_draw_center(bool p_enabled) {
	draw_center = p_enabled;
	emit_changed();
}
bool StyleBoxFlat::is_draw_center_enabled() const {
	return draw_center;
}

void StyleBoxFlat::set_skew(Vector2 p_skew) {
	skew = p_skew;
	emit_changed();
}

Vector2 StyleBoxFlat::get_skew() const {
	return skew;
}

void StyleBoxFlat::set_shadow_color(const Color &p_color) {
	shadow_color = p_color;
	emit_changed();
}
Color StyleBoxFlat::get_shadow_color() const {
	return shadow_color;
}

void StyleBoxFlat::set_shadow_size(const int &p_size) {
	shadow_size = p_size;
	emit_changed();
}
int StyleBoxFlat::get_shadow_size() const {
	return shadow_size;
}

void StyleBoxFlat::set_shadow_offset(const Point2 &p_offset) {
	shadow_offset = p_offset;
	emit_changed();
}
Point2 StyleBoxFlat::get_shadow_offset() const {
	return shadow_offset;
}

void StyleBoxFlat::set_anti_aliased(const bool &p_anti_aliased) {
	anti_aliased = p_anti_aliased;
	emit_changed();
}
bool StyleBoxFlat::is_anti_aliased() const {
	return anti_aliased;
}

void StyleBoxFlat::set_aa_size(const real_t &p_aa_size) {
	aa_size = CLAMP(p_aa_size, 0.01, 10);
	emit_changed();
}

float StyleBoxFlat::get_aa_size() const {
	return aa_size;
}

void StyleBoxFlat::set_corner_detail(const int &p_corner_detail) {
	corner_detail = CLAMP(p_corner_detail, 1, 20);
	emit_changed();
}

int StyleBoxFlat::get_corner_detail() const {
	return corner_detail;
}

Size2 StyleBoxFlat::get_center_size() const {
	return Size2();
}

inline void set_inner_corner_radius(const Rect2 style_rect, const Rect2 inner_rect, const real_t corner_radius[4], real_t *inner_corner_radius) {
	real_t border_left = inner_rect.position.x - style_rect.position.x;
	real_t border_top = inner_rect.position.y - style_rect.position.y;
	real_t border_right = style_rect.size.width - inner_rect.size.width - border_left;
	real_t border_bottom = style_rect.size.height - inner_rect.size.height - border_top;

	real_t rad;

	// Top left.
	rad = MIN(border_top, border_left);
	inner_corner_radius[0] = MAX(corner_radius[0] - rad, 0);

	// Top right;
	rad = MIN(border_top, border_right);
	inner_corner_radius[1] = MAX(corner_radius[1] - rad, 0);

	// Bottom right.
	rad = MIN(border_bottom, border_right);
	inner_corner_radius[2] = MAX(corner_radius[2] - rad, 0);

	// Bottom left.
	rad = MIN(border_bottom, border_left);
	inner_corner_radius[3] = MAX(corner_radius[3] - rad, 0);
}

inline void draw_ring(Vector<Vector2> &verts, Vector<int> &indices, Vector<Color> &colors, const Rect2 &style_rect, const real_t corner_radius[4],
		const Rect2 &ring_rect, const Rect2 &inner_rect, const Color &inner_color, const Color &outer_color, const int corner_detail, const Vector2 &skew, bool fill_center = false) {
	int vert_offset = verts.size();
	if (!vert_offset) {
		vert_offset = 0;
	}

	int adapted_corner_detail = (corner_radius[0] == 0 && corner_radius[1] == 0 && corner_radius[2] == 0 && corner_radius[3] == 0) ? 1 : corner_detail;

	real_t ring_corner_radius[4];
	set_inner_corner_radius(style_rect, ring_rect, corner_radius, ring_corner_radius);

	// Corner radius center points.
	Vector<Point2> outer_points;
	outer_points.push_back(ring_rect.position + Vector2(ring_corner_radius[0], ring_corner_radius[0])); //tl
	outer_points.push_back(Point2(ring_rect.position.x + ring_rect.size.x - ring_corner_radius[1], ring_rect.position.y + ring_corner_radius[1])); //tr
	outer_points.push_back(ring_rect.position + ring_rect.size - Vector2(ring_corner_radius[2], ring_corner_radius[2])); //br
	outer_points.push_back(Point2(ring_rect.position.x + ring_corner_radius[3], ring_rect.position.y + ring_rect.size.y - ring_corner_radius[3])); //bl

	real_t inner_corner_radius[4];
	set_inner_corner_radius(style_rect, inner_rect, corner_radius, inner_corner_radius);

	Vector<Point2> inner_points;
	inner_points.push_back(inner_rect.position + Vector2(inner_corner_radius[0], inner_corner_radius[0])); //tl
	inner_points.push_back(Point2(inner_rect.position.x + inner_rect.size.x - inner_corner_radius[1], inner_rect.position.y + inner_corner_radius[1])); //tr
	inner_points.push_back(inner_rect.position + inner_rect.size - Vector2(inner_corner_radius[2], inner_corner_radius[2])); //br
	inner_points.push_back(Point2(inner_rect.position.x + inner_corner_radius[3], inner_rect.position.y + inner_rect.size.y - inner_corner_radius[3])); //bl

	// Calculate the vertices.
	for (int corner_index = 0; corner_index < 4; corner_index++) {
		for (int detail = 0; detail <= adapted_corner_detail; detail++) {
			for (int inner_outer = 0; inner_outer < 2; inner_outer++) {
				real_t radius;
				Color color;
				Point2 corner_point;
				if (inner_outer == 0) {
					radius = inner_corner_radius[corner_index];
					color = inner_color;
					corner_point = inner_points[corner_index];
				} else {
					radius = ring_corner_radius[corner_index];
					color = outer_color;
					corner_point = outer_points[corner_index];
				}

				const float x = radius * (float)cos((double)corner_index * Math_PI / 2.0 + (double)detail / (double)adapted_corner_detail * Math_PI / 2.0 + Math_PI) + corner_point.x;
				const float y = radius * (float)sin((double)corner_index * Math_PI / 2.0 + (double)detail / (double)adapted_corner_detail * Math_PI / 2.0 + Math_PI) + corner_point.y;
				const float x_skew = -skew.x * (y - ring_rect.get_center().y);
				const float y_skew = -skew.y * (x - ring_rect.get_center().x);
				verts.push_back(Vector2(x + x_skew, y + y_skew));
				colors.push_back(color);
			}
		}
	}

	int ring_vert_count = verts.size() - vert_offset;

	// Fill the indices and the colors for the border.
	for (int i = 0; i < ring_vert_count; i++) {
		indices.push_back(vert_offset + ((i + 0) % ring_vert_count));
		indices.push_back(vert_offset + ((i + 2) % ring_vert_count));
		indices.push_back(vert_offset + ((i + 1) % ring_vert_count));
	}

	if (fill_center) {
		//Fill the indices and the colors for the center.
		for (int index = 0; index < ring_vert_count / 2; index += 2) {
			int i = index;
			// Polygon 1.
			indices.push_back(vert_offset + i);
			indices.push_back(vert_offset + ring_vert_count - 4 - i);
			indices.push_back(vert_offset + i + 2);
			// Polygon 2.
			indices.push_back(vert_offset + i);
			indices.push_back(vert_offset + ring_vert_count - 2 - i);
			indices.push_back(vert_offset + ring_vert_count - 4 - i);
		}
	}
}

inline void adapt_values(int p_index_a, int p_index_b, real_t *adapted_values, const real_t *p_values, const real_t p_width, const real_t p_max_a, const real_t p_max_b) {
	if (p_values[p_index_a] + p_values[p_index_b] > p_width) {
		real_t factor;
		real_t new_value;

		factor = (real_t)p_width / (real_t)(p_values[p_index_a] + p_values[p_index_b]);

		new_value = (p_values[p_index_a] * factor);
		if (new_value < adapted_values[p_index_a]) {
			adapted_values[p_index_a] = new_value;
		}
		new_value = (p_values[p_index_b] * factor);
		if (new_value < adapted_values[p_index_b]) {
			adapted_values[p_index_b] = new_value;
		}
	} else {
		adapted_values[p_index_a] = MIN(p_values[p_index_a], adapted_values[p_index_a]);
		adapted_values[p_index_b] = MIN(p_values[p_index_b], adapted_values[p_index_b]);
	}
	adapted_values[p_index_a] = MIN(p_max_a, adapted_values[p_index_a]);
	adapted_values[p_index_b] = MIN(p_max_b, adapted_values[p_index_b]);
}

Rect2 StyleBoxFlat::get_draw_rect(const Rect2 &p_rect) const {
	Rect2 draw_rect = p_rect.grow_individual(expand_margin[MARGIN_LEFT], expand_margin[MARGIN_TOP], expand_margin[MARGIN_RIGHT], expand_margin[MARGIN_BOTTOM]);

	if (shadow_size > 0) {
		Rect2 shadow_rect = draw_rect.grow(shadow_size);
		shadow_rect.position += shadow_offset;
		draw_rect = draw_rect.merge(shadow_rect);
	}

	return draw_rect;
}

void StyleBoxFlat::draw(RID p_canvas_item, const Rect2 &p_rect) const {
	bool draw_border = (border_width[0] > 0) || (border_width[1] > 0) || (border_width[2] > 0) || (border_width[3] > 0);
	bool draw_shadow = (shadow_size > 0);
	if (!draw_border && !draw_center && !draw_shadow) {
		return;
	}

	Rect2 style_rect = p_rect.grow_individual(expand_margin[MARGIN_LEFT], expand_margin[MARGIN_TOP], expand_margin[MARGIN_RIGHT], expand_margin[MARGIN_BOTTOM]);
	if (Math::is_zero_approx(style_rect.size.width) || Math::is_zero_approx(style_rect.size.height)) {
		return;
	}

	const bool rounded_corners = (corner_radius[0] > 0) || (corner_radius[1] > 0) || (corner_radius[2] > 0) || (corner_radius[3] > 0);
	// Only enable antialiasing if it is actually needed. This improve performances
	// and maximizes sharpness for non-skewed StyleBoxes with sharp corners.
	const bool aa_on = (rounded_corners || !skew.is_zero_approx()) && anti_aliased;

	const bool blend_on = blend_border && draw_border;

	Color border_color_alpha = Color(border_color.r, border_color.g, border_color.b, 0);
	Color border_color_blend = (draw_center ? bg_color : border_color_alpha);
	Color border_color_inner = blend_on ? border_color_blend : border_color;

	// Adapt borders (prevent weird overlapping/glitchy drawings).
	real_t width = MAX(style_rect.size.width, 0);
	real_t height = MAX(style_rect.size.height, 0);
	real_t adapted_border[4] = { 1000000.0, 1000000.0, 1000000.0, 1000000.0 };
	adapt_values(MARGIN_TOP, MARGIN_BOTTOM, adapted_border, border_width, height, height, height);
	adapt_values(MARGIN_LEFT, MARGIN_RIGHT, adapted_border, border_width, width, width, width);

	// Adapt corners (prevent weird overlapping/glitchy drawings).
	real_t adapted_corner[4] = { 1000000.0, 1000000.0, 1000000.0, 1000000.0 };
	adapt_values(CORNER_TOP_RIGHT, CORNER_BOTTOM_RIGHT, adapted_corner, corner_radius, height, height - adapted_border[MARGIN_BOTTOM], height - adapted_border[MARGIN_TOP]);
	adapt_values(CORNER_TOP_LEFT, CORNER_BOTTOM_LEFT, adapted_corner, corner_radius, height, height - adapted_border[MARGIN_BOTTOM], height - adapted_border[MARGIN_TOP]);
	adapt_values(CORNER_TOP_LEFT, CORNER_TOP_RIGHT, adapted_corner, corner_radius, width, width - adapted_border[MARGIN_RIGHT], width - adapted_border[MARGIN_LEFT]);
	adapt_values(CORNER_BOTTOM_LEFT, CORNER_BOTTOM_RIGHT, adapted_corner, corner_radius, width, width - adapted_border[MARGIN_RIGHT], width - adapted_border[MARGIN_LEFT]);

	Rect2 infill_rect = style_rect.grow_individual(-adapted_border[MARGIN_LEFT], -adapted_border[MARGIN_TOP], -adapted_border[MARGIN_RIGHT], -adapted_border[MARGIN_BOTTOM]);

	Rect2 border_style_rect = style_rect;
	if (aa_on) {
		for (int i = 0; i < 4; i++) {
			if (border_width[i] > 0) {
				border_style_rect = border_style_rect.grow_margin((Margin)i, -aa_size);
			}
		}
	}

	Vector<Point2> verts;
	Vector<int> indices;
	Vector<Color> colors;
	Vector<Point2> uvs;

	// Create shadow
	if (draw_shadow) {
		Rect2 shadow_inner_rect = style_rect;
		shadow_inner_rect.position += shadow_offset;

		Rect2 shadow_rect = style_rect.grow(shadow_size);
		shadow_rect.position += shadow_offset;

		Color shadow_color_transparent = Color(shadow_color.r, shadow_color.g, shadow_color.b, 0);

		draw_ring(verts, indices, colors, shadow_inner_rect, adapted_corner,
				shadow_rect, shadow_inner_rect, shadow_color, shadow_color_transparent, corner_detail, skew);

		if (draw_center) {
			draw_ring(verts, indices, colors, shadow_inner_rect, adapted_corner,
					shadow_inner_rect, shadow_inner_rect, shadow_color, shadow_color, corner_detail, skew, true);
		}
	}

	// Create border (no AA).
	if (draw_border && !aa_on) {
		draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
				border_style_rect, infill_rect, border_color_inner, border_color, corner_detail, skew);
	}

	// Create infill (no AA).
	if (draw_center && (!aa_on || blend_on || !draw_border)) {
		draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
				infill_rect, infill_rect, bg_color, bg_color, corner_detail, skew, true);
	}

	if (aa_on) {
		real_t aa_border_width[4];
		real_t aa_fill_width[4];
		if (draw_border) {
			for (int i = 0; i < 4; i++) {
				if (border_width[i] > 0) {
					aa_border_width[i] = aa_size;
					aa_fill_width[i] = 0;
				} else {
					aa_border_width[i] = 0;
					aa_fill_width[i] = aa_size;
				}
			}
		} else {
			for (int i = 0; i < 4; i++) {
				aa_border_width[i] = 0;
				aa_fill_width[i] = aa_size;
			}
		}

		Rect2 infill_inner_rect = infill_rect.grow_individual(-aa_border_width[MARGIN_LEFT], -aa_border_width[MARGIN_TOP],
				-aa_border_width[MARGIN_RIGHT], -aa_border_width[MARGIN_BOTTOM]);

		if (draw_center) {
			if (!blend_on && draw_border) {
				Rect2 infill_inner_rect_aa = infill_inner_rect.grow_individual(aa_border_width[MARGIN_LEFT], aa_border_width[MARGIN_TOP],
						aa_border_width[MARGIN_RIGHT], aa_border_width[MARGIN_BOTTOM]);
				// Create infill within AA border.
				draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
						infill_inner_rect_aa, infill_inner_rect_aa, bg_color, bg_color, corner_detail, skew, true);
			}

			if (!blend_on || !draw_border) {
				Rect2 infill_rect_aa = infill_rect.grow_individual(aa_fill_width[MARGIN_LEFT], aa_fill_width[MARGIN_TOP],
						aa_fill_width[MARGIN_RIGHT], aa_fill_width[MARGIN_BOTTOM]);

				Color alpha_bg = Color(bg_color.r, bg_color.g, bg_color.b, 0);

				// Create infill fake AA gradient.
				draw_ring(verts, indices, colors, style_rect, adapted_corner,
						infill_rect_aa, infill_rect, bg_color, alpha_bg, corner_detail, skew);
			}
		}

		if (draw_border) {
			Rect2 infill_rect_aa = infill_rect.grow_individual(aa_border_width[MARGIN_LEFT], aa_border_width[MARGIN_TOP],
					aa_border_width[MARGIN_RIGHT], aa_border_width[MARGIN_BOTTOM]);
			Rect2 style_rect_aa = style_rect.grow_individual(aa_border_width[MARGIN_LEFT], aa_border_width[MARGIN_TOP],
					aa_border_width[MARGIN_RIGHT], aa_border_width[MARGIN_BOTTOM]);
			Rect2 border_style_rect_aa = border_style_rect.grow_individual(aa_border_width[MARGIN_LEFT], aa_border_width[MARGIN_TOP],
					aa_border_width[MARGIN_RIGHT], aa_border_width[MARGIN_BOTTOM]);

			// Create border.
			draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
					border_style_rect_aa, ((blend_on) ? infill_rect : infill_rect_aa), border_color_inner, border_color, corner_detail, skew);

			if (!blend_on) {
				// Create inner border fake AA gradient.
				draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
						infill_rect_aa, infill_rect, border_color_blend, border_color, corner_detail, skew);
			}

			// Create outer border fake AA gradient.
			draw_ring(verts, indices, colors, border_style_rect, adapted_corner,
					style_rect_aa, border_style_rect_aa, border_color, border_color_alpha, corner_detail, skew);
		}
	}

	// Compute UV coordinates.
	Rect2 uv_rect = style_rect.grow(aa_on ? aa_size : 0);
	uvs.resize(verts.size());
	for (int i = 0; i < verts.size(); i++) {
		uvs.write[i].x = (verts[i].x - uv_rect.position.x) / uv_rect.size.width;
		uvs.write[i].y = (verts[i].y - uv_rect.position.y) / uv_rect.size.height;
	}

	// Draw stylebox.
	VisualServer *vs = VisualServer::get_singleton();
	vs->canvas_item_add_triangle_array(p_canvas_item, indices, verts, colors, uvs);
}

float StyleBoxFlat::get_style_margin(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0.0);
	return border_width[p_margin];
}
void StyleBoxFlat::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_bg_color", "color"), &StyleBoxFlat::set_bg_color);
	ClassDB::bind_method(D_METHOD("get_bg_color"), &StyleBoxFlat::get_bg_color);

	ClassDB::bind_method(D_METHOD("set_border_color", "color"), &StyleBoxFlat::set_border_color);
	ClassDB::bind_method(D_METHOD("get_border_color"), &StyleBoxFlat::get_border_color);

	ClassDB::bind_method(D_METHOD("set_border_width_all", "width"), &StyleBoxFlat::set_border_width_all);
	ClassDB::bind_method(D_METHOD("get_border_width_min"), &StyleBoxFlat::get_border_width_min);

	ClassDB::bind_method(D_METHOD("set_border_width", "margin", "width"), &StyleBoxFlat::set_border_width);
	ClassDB::bind_method(D_METHOD("get_border_width", "margin"), &StyleBoxFlat::get_border_width);

	ClassDB::bind_method(D_METHOD("set_border_blend", "blend"), &StyleBoxFlat::set_border_blend);
	ClassDB::bind_method(D_METHOD("get_border_blend"), &StyleBoxFlat::get_border_blend);

	ClassDB::bind_method(D_METHOD("set_corner_radius_individual", "radius_top_left", "radius_top_right", "radius_bottom_right", "radius_bottom_left"), &StyleBoxFlat::set_corner_radius_individual);
	ClassDB::bind_method(D_METHOD("set_corner_radius_all", "radius"), &StyleBoxFlat::set_corner_radius_all);

	ClassDB::bind_method(D_METHOD("set_corner_radius", "corner", "radius"), &StyleBoxFlat::set_corner_radius);
	ClassDB::bind_method(D_METHOD("get_corner_radius", "corner"), &StyleBoxFlat::get_corner_radius);

	ClassDB::bind_method(D_METHOD("set_expand_margin", "margin", "size"), &StyleBoxFlat::set_expand_margin_size);
	ClassDB::bind_method(D_METHOD("set_expand_margin_all", "size"), &StyleBoxFlat::set_expand_margin_size_all);
	ClassDB::bind_method(D_METHOD("set_expand_margin_individual", "size_left", "size_top", "size_right", "size_bottom"), &StyleBoxFlat::set_expand_margin_size_individual);
	ClassDB::bind_method(D_METHOD("get_expand_margin", "margin"), &StyleBoxFlat::get_expand_margin_size);

	ClassDB::bind_method(D_METHOD("set_draw_center", "draw_center"), &StyleBoxFlat::set_draw_center);
	ClassDB::bind_method(D_METHOD("is_draw_center_enabled"), &StyleBoxFlat::is_draw_center_enabled);

	ClassDB::bind_method(D_METHOD("set_skew", "skew"), &StyleBoxFlat::set_skew);
	ClassDB::bind_method(D_METHOD("get_skew"), &StyleBoxFlat::get_skew);

	ClassDB::bind_method(D_METHOD("set_shadow_color", "color"), &StyleBoxFlat::set_shadow_color);
	ClassDB::bind_method(D_METHOD("get_shadow_color"), &StyleBoxFlat::get_shadow_color);

	ClassDB::bind_method(D_METHOD("set_shadow_size", "size"), &StyleBoxFlat::set_shadow_size);
	ClassDB::bind_method(D_METHOD("get_shadow_size"), &StyleBoxFlat::get_shadow_size);

	ClassDB::bind_method(D_METHOD("set_shadow_offset", "offset"), &StyleBoxFlat::set_shadow_offset);
	ClassDB::bind_method(D_METHOD("get_shadow_offset"), &StyleBoxFlat::get_shadow_offset);

	ClassDB::bind_method(D_METHOD("set_anti_aliased", "anti_aliased"), &StyleBoxFlat::set_anti_aliased);
	ClassDB::bind_method(D_METHOD("is_anti_aliased"), &StyleBoxFlat::is_anti_aliased);

	ClassDB::bind_method(D_METHOD("set_aa_size", "size"), &StyleBoxFlat::set_aa_size);
	ClassDB::bind_method(D_METHOD("get_aa_size"), &StyleBoxFlat::get_aa_size);

	ClassDB::bind_method(D_METHOD("set_corner_detail", "detail"), &StyleBoxFlat::set_corner_detail);
	ClassDB::bind_method(D_METHOD("get_corner_detail"), &StyleBoxFlat::get_corner_detail);

	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "bg_color"), "set_bg_color", "get_bg_color");

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "draw_center"), "set_draw_center", "is_draw_center_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "skew"), "set_skew", "get_skew");

	ADD_GROUP("Border Width", "border_width_");
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "border_width_left", PROPERTY_HINT_RANGE, "0,1024,1"), "set_border_width", "get_border_width", MARGIN_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "border_width_top", PROPERTY_HINT_RANGE, "0,1024,1"), "set_border_width", "get_border_width", MARGIN_TOP);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "border_width_right", PROPERTY_HINT_RANGE, "0,1024,1"), "set_border_width", "get_border_width", MARGIN_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "border_width_bottom", PROPERTY_HINT_RANGE, "0,1024,1"), "set_border_width", "get_border_width", MARGIN_BOTTOM);

	ADD_GROUP("Border", "border_");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "border_color"), "set_border_color", "get_border_color");

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "border_blend"), "set_border_blend", "get_border_blend");

	ADD_GROUP("Corner Radius", "corner_radius_");
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "corner_radius_top_left", PROPERTY_HINT_RANGE, "0,1024,1"), "set_corner_radius", "get_corner_radius", CORNER_TOP_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "corner_radius_top_right", PROPERTY_HINT_RANGE, "0,1024,1"), "set_corner_radius", "get_corner_radius", CORNER_TOP_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "corner_radius_bottom_right", PROPERTY_HINT_RANGE, "0,1024,1"), "set_corner_radius", "get_corner_radius", CORNER_BOTTOM_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "corner_radius_bottom_left", PROPERTY_HINT_RANGE, "0,1024,1"), "set_corner_radius", "get_corner_radius", CORNER_BOTTOM_LEFT);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "corner_detail", PROPERTY_HINT_RANGE, "1,20,1"), "set_corner_detail", "get_corner_detail");

	ADD_GROUP("Expand Margin", "expand_margin_");
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_left", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin", "get_expand_margin", MARGIN_LEFT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_right", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin", "get_expand_margin", MARGIN_RIGHT);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_top", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin", "get_expand_margin", MARGIN_TOP);
	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "expand_margin_bottom", PROPERTY_HINT_RANGE, "0,2048,1"), "set_expand_margin", "get_expand_margin", MARGIN_BOTTOM);

	ADD_GROUP("Shadow", "shadow_");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "shadow_color"), "set_shadow_color", "get_shadow_color");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "shadow_size", PROPERTY_HINT_RANGE, "0,100,1,or_greater"), "set_shadow_size", "get_shadow_size");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "shadow_offset"), "set_shadow_offset", "get_shadow_offset");

	ADD_GROUP("Anti Aliasing", "anti_aliasing_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "anti_aliasing"), "set_anti_aliased", "is_anti_aliased");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "anti_aliasing_size", PROPERTY_HINT_RANGE, "0.01,10,0.001"), "set_aa_size", "get_aa_size");
}

StyleBoxFlat::StyleBoxFlat() {
	bg_color = Color(0.6, 0.6, 0.6);
<--- Variable 'bg_color' 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 'bg_color' a value by passing the value to the constructor in the initialization list.
	shadow_color = Color(0, 0, 0, 0.6);
	border_color = Color(0.8, 0.8, 0.8);

	blend_border = false;
	draw_center = true;
	anti_aliased = true;

	shadow_size = 0;
	shadow_offset = Point2(0, 0);
	corner_detail = 8;
	aa_size = 0.625;

	border_width[0] = 0;
	border_width[1] = 0;
	border_width[2] = 0;
	border_width[3] = 0;

	expand_margin[0] = 0;
	expand_margin[1] = 0;
	expand_margin[2] = 0;
	expand_margin[3] = 0;

	corner_radius[0] = 0;
	corner_radius[1] = 0;
	corner_radius[2] = 0;
	corner_radius[3] = 0;
}
StyleBoxFlat::~StyleBoxFlat() {
}

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

void StyleBoxLine::set_thickness(int p_thickness) {
	thickness = p_thickness;
	emit_changed();
}
int StyleBoxLine::get_thickness() const {
	return thickness;
}

void StyleBoxLine::set_vertical(bool p_vertical) {
	vertical = p_vertical;
	emit_changed();
}
bool StyleBoxLine::is_vertical() const {
	return vertical;
}

void StyleBoxLine::set_grow_end(float p_grow_end) {
	grow_end = p_grow_end;
	emit_changed();
}
float StyleBoxLine::get_grow_end() const {
	return grow_end;
}

void StyleBoxLine::set_grow_begin(float p_grow_begin) {
	grow_begin = p_grow_begin;
	emit_changed();
}
float StyleBoxLine::get_grow_begin() const {
	return grow_begin;
}

void StyleBoxLine::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_color", "color"), &StyleBoxLine::set_color);
	ClassDB::bind_method(D_METHOD("get_color"), &StyleBoxLine::get_color);
	ClassDB::bind_method(D_METHOD("set_thickness", "thickness"), &StyleBoxLine::set_thickness);
	ClassDB::bind_method(D_METHOD("get_thickness"), &StyleBoxLine::get_thickness);
	ClassDB::bind_method(D_METHOD("set_grow_begin", "offset"), &StyleBoxLine::set_grow_begin);
	ClassDB::bind_method(D_METHOD("get_grow_begin"), &StyleBoxLine::get_grow_begin);
	ClassDB::bind_method(D_METHOD("set_grow_end", "offset"), &StyleBoxLine::set_grow_end);
	ClassDB::bind_method(D_METHOD("get_grow_end"), &StyleBoxLine::get_grow_end);
	ClassDB::bind_method(D_METHOD("set_vertical", "vertical"), &StyleBoxLine::set_vertical);
	ClassDB::bind_method(D_METHOD("is_vertical"), &StyleBoxLine::is_vertical);

	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_color", "get_color");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "grow_begin", PROPERTY_HINT_RANGE, "-300,300,1"), "set_grow_begin", "get_grow_begin");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "grow_end", PROPERTY_HINT_RANGE, "-300,300,1"), "set_grow_end", "get_grow_end");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "thickness", PROPERTY_HINT_RANGE, "0,100"), "set_thickness", "get_thickness");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "vertical"), "set_vertical", "is_vertical");
}

float StyleBoxLine::get_style_margin(Margin p_margin) const {
	ERR_FAIL_INDEX_V((int)p_margin, 4, 0);

	if (vertical) {
		if (p_margin == MARGIN_LEFT || p_margin == MARGIN_RIGHT) {
			return thickness / 2.0;
		}
	} else if (p_margin == MARGIN_TOP || p_margin == MARGIN_BOTTOM) {
		return thickness / 2.0;
	}

	return 0;
}
Size2 StyleBoxLine::get_center_size() const {
	return Size2();
}

void StyleBoxLine::draw(RID p_canvas_item, const Rect2 &p_rect) const {
	VisualServer *vs = VisualServer::get_singleton();
	Rect2i r = p_rect;

	if (vertical) {
		r.position.y -= grow_begin;
		r.size.y += (grow_begin + grow_end);
		r.size.x = thickness;
	} else {
		r.position.x -= grow_begin;
		r.size.x += (grow_begin + grow_end);
		r.size.y = thickness;
	}

	vs->canvas_item_add_rect(p_canvas_item, r, color);
}

StyleBoxLine::StyleBoxLine() {
	grow_begin = 1.0;
	grow_end = 1.0;
	thickness = 1;
	color = Color(0.0, 0.0, 0.0);
<--- Variable 'color' 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 'color' a value by passing the value to the constructor in the initialization list.
	vertical = false;
}
StyleBoxLine::~StyleBoxLine() {}