godot/scene/2d/parallax_layer.cpp
Hein-Pieter van Braam cacced7e50 Convert Object::cast_to() to the static version
Currently we rely on some undefined behavior when Object->cast_to() gets
called with a Null pointer. This used to work fine with GCC < 6 but
newer versions of GCC remove all codepaths in which the this pointer is
Null. However, the non-static cast_to() was supposed to be null safe.

This patch makes cast_to() Null safe and removes the now redundant Null
checks where they existed.

It is explained in this article: https://www.viva64.com/en/b/0226/
2017-08-24 23:08:24 +02:00

158 lines
5.5 KiB
C++

/*************************************************************************/
/* parallax_layer.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "parallax_layer.h"
#include "engine.h"
#include "parallax_background.h"
void ParallaxLayer::set_motion_scale(const Size2 &p_scale) {
motion_scale = p_scale;
ParallaxBackground *pb = Object::cast_to<ParallaxBackground>(get_parent());
if (pb && is_inside_tree()) {
Vector2 ofs = pb->get_final_offset();
float scale = pb->get_scroll_scale();
set_base_offset_and_scale(ofs, scale);
}
}
Size2 ParallaxLayer::get_motion_scale() const {
return motion_scale;
}
void ParallaxLayer::set_motion_offset(const Size2 &p_offset) {
motion_offset = p_offset;
ParallaxBackground *pb = Object::cast_to<ParallaxBackground>(get_parent());
if (pb && is_inside_tree()) {
Vector2 ofs = pb->get_final_offset();
float scale = pb->get_scroll_scale();
set_base_offset_and_scale(ofs, scale);
}
}
Size2 ParallaxLayer::get_motion_offset() const {
return motion_offset;
}
void ParallaxLayer::_update_mirroring() {
ParallaxBackground *pb = Object::cast_to<ParallaxBackground>(get_parent());
if (pb) {
RID c = pb->get_world_2d()->get_canvas();
RID ci = get_canvas_item();
VisualServer::get_singleton()->canvas_set_item_mirroring(c, ci, mirroring);
}
}
void ParallaxLayer::set_mirroring(const Size2 &p_mirroring) {
mirroring = p_mirroring;
if (mirroring.x < 0)
mirroring.x = 0;
if (mirroring.y < 0)
mirroring.y = 0;
_update_mirroring();
}
Size2 ParallaxLayer::get_mirroring() const {
return mirroring;
}
void ParallaxLayer::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_ENTER_TREE: {
orig_offset = get_position();
orig_scale = get_scale();
_update_mirroring();
} break;
}
}
void ParallaxLayer::set_base_offset_and_scale(const Point2 &p_offset, float p_scale) {
if (!is_inside_tree())
return;
if (Engine::get_singleton()->is_editor_hint())
return;
Point2 new_ofs = ((orig_offset + p_offset) * motion_scale) * p_scale + motion_offset;
if (mirroring.x) {
double den = mirroring.x * p_scale;
new_ofs.x -= den * ceil(new_ofs.x / den);
}
if (mirroring.y) {
double den = mirroring.y * p_scale;
new_ofs.y -= den * ceil(new_ofs.y / den);
}
set_position(new_ofs);
set_scale(Vector2(1, 1) * p_scale);
}
String ParallaxLayer::get_configuration_warning() const {
if (!Object::cast_to<ParallaxBackground>(get_parent())) {
return TTR("ParallaxLayer node only works when set as child of a ParallaxBackground node.");
}
return String();
}
void ParallaxLayer::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_motion_scale", "scale"), &ParallaxLayer::set_motion_scale);
ClassDB::bind_method(D_METHOD("get_motion_scale"), &ParallaxLayer::get_motion_scale);
ClassDB::bind_method(D_METHOD("set_motion_offset", "offset"), &ParallaxLayer::set_motion_offset);
ClassDB::bind_method(D_METHOD("get_motion_offset"), &ParallaxLayer::get_motion_offset);
ClassDB::bind_method(D_METHOD("set_mirroring", "mirror"), &ParallaxLayer::set_mirroring);
ClassDB::bind_method(D_METHOD("get_mirroring"), &ParallaxLayer::get_mirroring);
ADD_GROUP("Motion", "motion_");
ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion_scale"), "set_motion_scale", "get_motion_scale");
ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion_offset"), "set_motion_offset", "get_motion_offset");
ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion_mirroring"), "set_mirroring", "get_mirroring");
}
ParallaxLayer::ParallaxLayer() {
motion_scale = Size2(1, 1);
}