[mutter] crtc/kms: Use plane formats if no IN_FORMATS

[Jonas Ådahl <jadahl src gnome org>]

commit 0789c3fb9f2536b05f6e09cdedbbee1a40b6e089
Author: Pekka Paalanen <pekka paalanen collabora com>
Date:   Mon Nov 19 13:20:37 2018 +0200

    crtc/kms: Use plane formats if no IN_FORMATS
    
    If the IN_FORMATS property is not found, copy the formats from the DRM
    plane instead. This is the fallback for getting a list of formats the
    primary plane supports when DRM universal planes capability is enabled.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/341

 src/backends/native/meta-crtc-kms.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
---
diff --git a/src/backends/native/meta-crtc-kms.c b/src/backends/native/meta-crtc-kms.c
index 2cc477808..3f423f966 100644
--- a/src/backends/native/meta-crtc-kms.c
+++ b/src/backends/native/meta-crtc-kms.c
@@ -211,6 +211,21 @@ free_modifier_array (GArray *array)
   g_array_free (array, TRUE);
 }
 
+static void
+set_formats_from_array (MetaCrtc       *crtc,
+                        const uint32_t *formats,
+                        size_t          n_formats)
+{
+  MetaCrtcKms *crtc_kms = crtc->driver_private;
+  size_t i;
+
+  for (i = 0; i < n_formats; i++)
+    {
+      g_hash_table_insert (crtc_kms->formats_modifiers,
+                           GUINT_TO_POINTER (formats[i]), NULL);
+    }
+}
+
 static void
 parse_formats (MetaCrtc *crtc,
                int       kms_fd,
@@ -372,6 +387,14 @@ init_crtc_rotations (MetaCrtc *crtc,
                   parse_formats (crtc, kms_fd, props->prop_values[fmts_idx]);
                   drmModeFreeProperty (prop);
                 }
+
+              /* fall back to universal plane formats without modifiers */
+              if (g_hash_table_size (crtc_kms->formats_modifiers) == 0)
+                {
+                  set_formats_from_array (crtc,
+                                          drm_plane->formats,
+                                          drm_plane->count_formats);
+                }
             }
 
           if (props)