1 files changed, 14 insertions, 8 deletions
diff --git a/Source/Core/VideoCommon/RenderBase.cpp b/Source/Core/VideoCommon/RenderBase.cpp
index 039da1f189..4c84350bb8 100644
--- a/Source/Core/VideoCommon/RenderBase.cpp
+++ b/Source/Core/VideoCommon/RenderBase.cpp
@@ -1251,7 +1251,14 @@ void Renderer::Swap(u32 xfb_addr, u32 fb_width, u32 fb_stride, u32 fb_height, u6
       {
         BindBackbuffer({{0.0f, 0.0f, 0.0f, 1.0f}});
         UpdateDrawRectangle();
-        RenderXFBToScreen(xfb_entry->texture.get(), xfb_rect);
+
+        // Adjust the source rectangle instead of using an oversized viewport to render the XFB.
+        auto render_target_rc = GetTargetRectangle();
+        auto render_source_rc = xfb_rect;
+        AdjustRectanglesToFitBounds(&render_target_rc, &xfb_rect, m_backbuffer_width,
+                                    m_backbuffer_height);
+        RenderXFBToScreen(render_target_rc, xfb_entry->texture.get(), render_source_rc);
+
         DrawImGui();
 
         // Present to the window system.
@@ -1319,23 +1326,22 @@ void Renderer::Swap(u32 xfb_addr, u32 fb_width, u32 fb_stride, u32 fb_height, u6
   }
 }
 
-void Renderer::RenderXFBToScreen(const AbstractTexture* texture, const MathUtil::Rectangle<int>& rc)
+void Renderer::RenderXFBToScreen(const MathUtil::Rectangle<int>& target_rc,
+                                 const AbstractTexture* source_texture,
+                                 const MathUtil::Rectangle<int>& source_rc)
 {
-  auto adjusted_rc = rc;
-  auto target_rc = GetTargetRectangle();
-  AdjustRectanglesToFitBounds(&target_rc, &adjusted_rc, m_backbuffer_width, m_backbuffer_height);
   if (g_ActiveConfig.stereo_mode == StereoMode::SBS ||
       g_ActiveConfig.stereo_mode == StereoMode::TAB)
   {
     MathUtil::Rectangle<int> left_rc, right_rc;
     std::tie(left_rc, right_rc) = ConvertStereoRectangle(target_rc);
 
-    m_post_processor->BlitFromTexture(left_rc, adjusted_rc, texture, 0);
-    m_post_processor->BlitFromTexture(right_rc, adjusted_rc, texture, 1);
+    m_post_processor->BlitFromTexture(left_rc, source_rc, source_texture, 0);
+    m_post_processor->BlitFromTexture(right_rc, source_rc, source_texture, 1);
   }
   else
   {
-    m_post_processor->BlitFromTexture(target_rc, adjusted_rc, texture, 0);
+    m_post_processor->BlitFromTexture(target_rc, source_rc, source_texture, 0);
   }
 }