framebuffer: Add hybrid layout mode to FrameLayoutFromResolutionScale (#807)

* framebuffer: Add hybrid layout mode to FrameLayoutFromResolutionScale

* framebuffer_layout.cpp: Moved seemingly misplaced `default` case to proper location

* framebuffer_layout.cpp: Fixed incorrect calculation of framebuffer dimensions for hybrid layout

* framebuffer_layout.cpp: Made implicit cast from float to int explicit

---------

Co-authored-by: Kleidis <167202775+kleidis@users.noreply.github.com>

src/core/frontend/framebuffer_layout.cpp

@@ -1,4 +1,4 @@
-// Copyright 2016 Citra Emulator Project
+// Copyright Citra Emulator Project / Azahar Emulator Project
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
@@ -443,6 +443,24 @@ FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale, bool is_secondar
                                     Settings::values.upright_screen.GetValue(), 1,
                                     Settings::SmallScreenPosition::MiddleRight);
 
+        case Settings::LayoutOption::HybridScreen:
+            height = Core::kScreenTopHeight * res_scale;
+
+            if (Settings::values.swap_screen.GetValue()) {
+                width = Core::kScreenBottomWidth;
+            } else {
+                width = Core::kScreenTopWidth;
+            }
+            // 2.25f comes from HybridScreenLayout's scale_factor value.
+            width = static_cast<int>((width + (Core::kScreenTopWidth / 2.25f)) * res_scale);
+
+            if (Settings::values.upright_screen.GetValue()) {
+                std::swap(width, height);
+            }
+
+            return HybridScreenLayout(width, height, Settings::values.swap_screen.GetValue(),
+                                      Settings::values.upright_screen.GetValue());
+
         case Settings::LayoutOption::Default:
         default:
             width = Core::kScreenTopWidth * res_scale;