From 8b597fbc5fe8baa021f23fd4cd89af03f1f8a5c8 Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Sat, 24 Jan 2026 22:41:33 +0100
Subject: [PATCH] render_output_size

---
 app/src/screen.c   | 31 +++++++++++++++----------------
 app/src/util/sdl.c | 19 +++++++++++++++++++
 app/src/util/sdl.h |  3 +++
 3 files changed, 37 insertions(+), 16 deletions(-)

diff --git a/app/src/screen.c b/app/src/screen.c
index 9776063e..f10e8560 100644
--- a/app/src/screen.c
+++ b/app/src/screen.c
@@ -148,34 +148,33 @@ sc_screen_update_content_rect(struct sc_screen *screen) {
     assert(screen->video);
 
     struct sc_size content_size = screen->content_size;
-    // The drawable size is the window size * the HiDPI scale
-    struct sc_size drawable_size =
-        sc_sdl_get_window_size_in_pixels(screen->window);
+    struct sc_size render_size =
+        sc_sdl_get_render_output_size(screen->renderer);
 
     SDL_Rect *rect = &screen->rect;
 
-    if (is_optimal_size(drawable_size, content_size)) {
+    if (is_optimal_size(render_size, content_size)) {
         rect->x = 0;
         rect->y = 0;
-        rect->w = drawable_size.width;
-        rect->h = drawable_size.height;
+        rect->w = render_size.width;
+        rect->h = render_size.height;
         return;
     }
 
-    bool keep_width = content_size.width * drawable_size.height
-                    > content_size.height * drawable_size.width;
+    bool keep_width = content_size.width * render_size.height
+                    > content_size.height * render_size.width;
     if (keep_width) {
         rect->x = 0;
-        rect->w = drawable_size.width;
-        rect->h = drawable_size.width * content_size.height
-                                      / content_size.width;
-        rect->y = (drawable_size.height - rect->h) / 2;
+        rect->w = render_size.width;
+        rect->h = render_size.width * content_size.height
+                                    / content_size.width;
+        rect->y = (render_size.height - rect->h) / 2;
     } else {
         rect->y = 0;
-        rect->h = drawable_size.height;
-        rect->w = drawable_size.height * content_size.width
-                                       / content_size.height;
-        rect->x = (drawable_size.width - rect->w) / 2;
+        rect->h = render_size.height;
+        rect->w = render_size.height * content_size.width
+                                     / content_size.height;
+        rect->x = (render_size.width - rect->w) / 2;
     }
 }
 
diff --git a/app/src/util/sdl.c b/app/src/util/sdl.c
index 07921817..84ce357d 100644
--- a/app/src/util/sdl.c
+++ b/app/src/util/sdl.c
@@ -130,6 +130,25 @@ sc_sdl_hide_window(SDL_Window *window) {
     }
 }
 
+struct sc_size
+sc_sdl_get_render_output_size(SDL_Renderer *renderer) {
+    int width;
+    int height;
+    bool ok = SDL_GetRenderOutputSize(renderer, &width, &height);
+    if (!ok) {
+        LOGE("Could not get render output size: %s", SDL_GetError());
+        LOGE("Please report the error");
+        // fatal error
+        abort();
+    }
+
+    struct sc_size size = {
+        .width = width,
+        .height = height,
+    };
+    return size;
+}
+
 bool
 sc_sdl_render_clear(SDL_Renderer *renderer) {
     bool ok = SDL_RenderClear(renderer);
diff --git a/app/src/util/sdl.h b/app/src/util/sdl.h
index 78b8319e..bdd748c2 100644
--- a/app/src/util/sdl.h
+++ b/app/src/util/sdl.h
@@ -34,6 +34,9 @@ sc_sdl_show_window(SDL_Window *window);
 void
 sc_sdl_hide_window(SDL_Window *window);
 
+struct sc_size
+sc_sdl_get_render_output_size(SDL_Renderer *renderer);
+
 bool
 sc_sdl_render_clear(SDL_Renderer *renderer);