From 2bf2217b1a0695db73e1b770353c3e1c4580dfd7 Mon Sep 17 00:00:00 2001
From: Markus Sauermann <6299227+Sauermann@users.noreply.github.com>
Date: Thu, 31 Mar 2022 22:40:26 +0200
Subject: Calculate window input event transform only on window change

---
 scene/main/viewport.cpp | 11 ++++-------
 scene/main/window.cpp   |  8 ++++++++
 scene/main/window.h     |  2 ++
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 549cc19cb1..8b6305b3a4 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -1108,14 +1108,11 @@ Viewport::PositionalShadowAtlasQuadrantSubdiv Viewport::get_positional_shadow_at
 }
 
 Transform2D Viewport::_get_input_pre_xform() const {
-	Transform2D pre_xf;
-
-	if (to_screen_rect.size.x != 0 && to_screen_rect.size.y != 0) {
-		pre_xf.columns[2] = -to_screen_rect.position;
-		pre_xf.scale(Vector2(size) / to_screen_rect.size);
+	const Window *this_window = Object::cast_to<Window>(this);
+	if (this_window) {
+		return this_window->window_transform.affine_inverse();
 	}
-
-	return pre_xf;
+	return Transform2D();
 }
 
 Ref<InputEvent> Viewport::_make_input_local(const Ref<InputEvent> &ev) {
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index 64869b2936..dc04941ae7 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -668,6 +668,7 @@ void Window::_update_viewport_size() {
 	Rect2i attach_to_screen_rect(Point2i(), size);
 	Transform2D stretch_transform;
 	float font_oversampling = 1.0;
+	window_transform = Transform2D();
 
 	if (content_scale_mode == CONTENT_SCALE_MODE_DISABLED || content_scale_size.x == 0 || content_scale_size.y == 0) {
 		font_oversampling = content_scale_factor;
@@ -754,11 +755,18 @@ void Window::_update_viewport_size() {
 				Size2 scale = Vector2(screen_size) / Vector2(final_size_override);
 				stretch_transform.scale(scale);
 
+				window_transform.translate_local(margin);
 			} break;
 			case CONTENT_SCALE_MODE_VIEWPORT: {
 				final_size = (viewport_size / content_scale_factor).floor();
 				attach_to_screen_rect = Rect2(margin, screen_size);
 
+				window_transform.translate_local(margin);
+				if (final_size.x != 0 && final_size.y != 0) {
+					Transform2D scale_transform;
+					scale_transform.scale(Vector2(attach_to_screen_rect.size) / Vector2(final_size));
+					window_transform *= scale_transform;
+				}
 			} break;
 		}
 	}
diff --git a/scene/main/window.h b/scene/main/window.h
index 786f0ada38..c019730cac 100644
--- a/scene/main/window.h
+++ b/scene/main/window.h
@@ -152,6 +152,8 @@ private:
 
 	Viewport *embedder = nullptr;
 
+	Transform2D window_transform;
+
 	friend class Viewport; //friend back, can call the methods below
 
 	void _window_input(const Ref<InputEvent> &p_ev);
-- 
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