crtc/native: Add API to check whether the CRTC supports hardware cursors

On a KMS backed CRTC, hardware cursor are supported when there are
cursor planes to assign them to. Note that when using legacy mode
setting, fake cursor planes are added when adequate.

On virtual CRTCs, used with virtual monitors, the equivalent of hardware
cursor are always supported, as they are sent using embedded PipeWire
stream metadata.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1991>

(cherry picked from commit e82685d04944026389ac0436bfc87550dfe48c82)

4 files changed, 30 insertions, 0 deletions

diff --git a/src/backends/native/meta-crtc-kms.c b/src/backends/native/meta-crtc-kms.c
index f1bc79146..d03fdd533 100644
--- a/src/backends/native/meta-crtc-kms.c
+++ b/src/backends/native/meta-crtc-kms.c
@@ -94,6 +94,16 @@ meta_crtc_kms_is_transform_handled (MetaCrtcNative       *crtc_native,
   return is_transform_handled (crtc_kms, transform);
 }
 
+static gboolean
+meta_crtc_kms_is_hw_cursor_supported (MetaCrtcNative *crtc_native)
+{
+  MetaCrtcKms *crtc_kms = META_CRTC_KMS (crtc_native);
+  MetaKmsCrtc *kms_crtc = meta_crtc_kms_get_kms_crtc (crtc_kms);
+  MetaKmsDevice *kms_device = meta_kms_crtc_get_device (kms_crtc);
+
+  return !!meta_kms_device_get_cursor_plane_for (kms_device, kms_crtc);
+}
+
 void
 meta_crtc_kms_apply_transform (MetaCrtcKms            *crtc_kms,
                                MetaKmsPlaneAssignment *kms_plane_assignment)
@@ -383,4 +393,5 @@ meta_crtc_kms_class_init (MetaCrtcKmsClass *klass)
   object_class->dispose = meta_crtc_kms_dispose;
 
   crtc_native_class->is_transform_handled = meta_crtc_kms_is_transform_handled;
+  crtc_native_class->is_hw_cursor_supported = meta_crtc_kms_is_hw_cursor_supported;
 }
diff --git a/src/backends/native/meta-crtc-native.c b/src/backends/native/meta-crtc-native.c
index 5e5751780..44e8d5088 100644
--- a/src/backends/native/meta-crtc-native.c
+++ b/src/backends/native/meta-crtc-native.c
@@ -33,6 +33,14 @@ meta_crtc_native_is_transform_handled (MetaCrtcNative       *crtc_native,
   return klass->is_transform_handled (crtc_native, transform);
 }
 
+gboolean
+meta_crtc_native_is_hw_cursor_supported (MetaCrtcNative *crtc_native)
+{
+  MetaCrtcNativeClass *klass = META_CRTC_NATIVE_GET_CLASS (crtc_native);
+
+  return klass->is_hw_cursor_supported (crtc_native);
+}
+
 static void
 meta_crtc_native_init (MetaCrtcNative *crtc_native)
 {
diff --git a/src/backends/native/meta-crtc-native.h b/src/backends/native/meta-crtc-native.h
index 0c16e5895..c373604ee 100644
--- a/src/backends/native/meta-crtc-native.h
+++ b/src/backends/native/meta-crtc-native.h
@@ -33,9 +33,12 @@ struct _MetaCrtcNativeClass
 
   gboolean (* is_transform_handled) (MetaCrtcNative       *crtc_native,
                                      MetaMonitorTransform  monitor_transform);
+  gboolean (* is_hw_cursor_supported) (MetaCrtcNative *crtc_native);
 };
 
 gboolean meta_crtc_native_is_transform_handled (MetaCrtcNative       *crtc_native,
                                                 MetaMonitorTransform  transform);
 
+gboolean meta_crtc_native_is_hw_cursor_supported (MetaCrtcNative *crtc_native);
+
 #endif /* META_CRTC_NATIVE_H */
diff --git a/src/backends/native/meta-crtc-virtual.c b/src/backends/native/meta-crtc-virtual.c
index eee346a23..60b59a3f2 100644
--- a/src/backends/native/meta-crtc-virtual.c
+++ b/src/backends/native/meta-crtc-virtual.c
@@ -45,6 +45,12 @@ meta_crtc_virtual_is_transform_handled (MetaCrtcNative       *crtc_native,
   return transform == META_MONITOR_TRANSFORM_NORMAL;
 }
 
+static gboolean
+meta_crtc_virtual_is_hw_cursor_supported (MetaCrtcNative *crtc_native)
+{
+  return TRUE;
+}
+
 static void
 meta_crtc_virtual_init (MetaCrtcVirtual *crtc_virtual)
 {
@@ -57,4 +63,6 @@ meta_crtc_virtual_class_init (MetaCrtcVirtualClass *klass)
 
   crtc_native_class->is_transform_handled =
     meta_crtc_virtual_is_transform_handled;
+  crtc_native_class->is_hw_cursor_supported =
+    meta_crtc_virtual_is_hw_cursor_supported;
 }