From bc51d937f348cb884dfb702b7e5f7522cdda51f2 Mon Sep 17 00:00:00 2001
From: Sky Leite <sky@leite.dev>
Date: Wed, 18 Feb 2026 22:25:25 -0300
Subject: [PATCH] Backends: SDL2: Fix incorrect screen clipping when
 SDL_RenderSetLogicalSize is used

---
 backends/imgui_impl_sdl2.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/backends/imgui_impl_sdl2.cpp b/backends/imgui_impl_sdl2.cpp
index f578977c45ec..f3417b4b8458 100644
--- a/backends/imgui_impl_sdl2.cpp
+++ b/backends/imgui_impl_sdl2.cpp
@@ -870,7 +870,13 @@ static void ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(SDL_Window* window,
 {
     int w, h;
     int display_w, display_h;
-    SDL_GetWindowSize(window, &w, &h);
+
+    SDL_RenderGetLogicalSize(renderer, &w, &h);
+    if (w == 0 || h == 0)
+    { // GetLogicalSize returns 0, 0 when it is unset
+        SDL_GetWindowSize(window, &w, &h);
+    }
+
     if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
         w = h = 0;
     if (renderer != nullptr)