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src/core/frontend/framebuffer_layout.cpp

@@ -27,22 +27,9 @@ FramebufferLayout DefaultFrameLayout(u32 width, u32 height) {
     // so just calculate them both even if the other isn't showing.
     FramebufferLayout res{width, height};
 
-    const auto window_aspect_ratio = static_cast<float>(height) / width;
-    float emulation_aspect_ratio;
-
-    switch (static_cast<Aspect>(Settings::values.aspect_ratio)) {
-    case Aspect::AspectDefault:
-        emulation_aspect_ratio = static_cast<float>(ScreenUndocked::Height) / ScreenUndocked::Width;
-        break;
-    case Aspect::Aspect21by9:
-        emulation_aspect_ratio = 9.f / 21;
-        break;
-    case Aspect::AspectStretch:
-        emulation_aspect_ratio = window_aspect_ratio;
-        break;
-    default:
-        emulation_aspect_ratio = static_cast<float>(ScreenUndocked::Height) / ScreenUndocked::Width;
-    }
+    const float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = EmulationAspectRatio(
+        static_cast<Aspect>(Settings::values.aspect_ratio), window_aspect_ratio);
 
     const Common::Rectangle<u32> screen_window_area{0, 0, width, height};
     Common::Rectangle<u32> screen = MaxRectangle(screen_window_area, emulation_aspect_ratio);
@@ -71,4 +58,17 @@ FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale) {
     return DefaultFrameLayout(width, height);
 }
 
+float EmulationAspectRatio(Aspect aspect, float window_aspect_ratio) {
+    switch (aspect) {
+    case Aspect::Default:
+        return static_cast<float>(ScreenUndocked::Height) / ScreenUndocked::Width;
+    case Aspect::Aspect21by9:
+        return 9.0f / 21.0f;
+    case Aspect::StretchToWindow:
+        return window_aspect_ratio;
+    default:
+        return static_cast<float>(ScreenUndocked::Height) / ScreenUndocked::Width;
+    }
+}
+
 } // namespace Layout

src/core/frontend/framebuffer_layout.h

@@ -19,9 +19,9 @@ enum ScreenDocked : u32 {
 };
 
 enum class Aspect {
-    AspectDefault,
+    Default,
     Aspect21by9,
-    AspectStretch,
+    StretchToWindow,
 };
 
 /// Describes the layout of the window framebuffer
@@ -54,4 +54,12 @@ FramebufferLayout DefaultFrameLayout(u32 width, u32 height);
  */
 FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale);
 
+/**
+ * Convenience method to determine emulation aspect ratio
+ * @param aspect Represents the index of aspect ratio in Settings::values.aspect_ratio
+ * @param window_aspect_ratio Current window aspect ratio
+ * @return Emulation render window aspect ratio
+ */
+float EmulationAspectRatio(Aspect aspect, float window_aspect_ratio);
+
 } // namespace Layout