[mutter] renderer-native: Use CRTC layout in stage view

[Jonas Ådahl <jadahl src gnome org>]

commit bc350f37f5ad152ea4f37bacd156553c8b7f7b2a
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Apr 14 10:44:16 2020 +0200

    renderer-native: Use CRTC layout in stage view
    
    The port to per CRTC views was incomplete; we still used the logical
    monitor layout as the stage view layout, while still using one view per
    CRTC.
    
    This worked fine for most cases, e.g. regular monitors, tiled or
    non-tiled, transformed or non-transformed. Where it broke, however, was
    when a monitor consists of multiple CRTCs. We already have the layout a
    CRTC corresponds to on the stage kept with the CRTC metadata, so use
    this directly.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1170
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1199`

 src/backends/native/meta-renderer-native.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index d1d713040..8d82ad7c4 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -3037,6 +3037,7 @@ meta_renderer_native_create_view (MetaRenderer       *renderer,
   float scale;
   int onscreen_width;
   int onscreen_height;
+  MetaRectangle view_layout;
   MetaRendererView *view;
   GError *error = NULL;
 
@@ -3108,8 +3109,11 @@ meta_renderer_native_create_view (MetaRenderer       *renderer,
   else
     scale = 1.0;
 
+  meta_rectangle_from_graphene_rect (&crtc->config->layout,
+                                     META_ROUNDING_STRATEGY_ROUND,
+                                     &view_layout);
   view = g_object_new (META_TYPE_RENDERER_VIEW,
-                       "layout", &logical_monitor->rect,
+                       "layout", &view_layout,
                        "scale", scale,
                        "framebuffer", onscreen,
                        "offscreen", offscreen,