monitor-manager/kms: Use KMS abstraction to get and set CRTC gamma

Still doesn't synchronize with frame drawing, but no point in doing that
until gamma is managed by mutter itself and not gnome-settings-daemon.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/634

src/backends/native/meta-kms-crtc.c

@@ -40,6 +40,17 @@ struct _MetaKmsCrtc
 
 G_DEFINE_TYPE (MetaKmsCrtc, meta_kms_crtc, G_TYPE_OBJECT)
 
+void
+meta_kms_crtc_set_gamma (MetaKmsCrtc    *crtc,
+                         MetaKmsUpdate  *update,
+                         int             size,
+                         const uint16_t *red,
+                         const uint16_t *green,
+                         const uint16_t *blue)
+{
+  meta_kms_update_set_crtc_gamma (update, crtc, size, red, green, blue);
+}
+
 MetaKmsDevice *
 meta_kms_crtc_get_device (MetaKmsCrtc *crtc)
 {
@@ -64,6 +75,36 @@ meta_kms_crtc_get_idx (MetaKmsCrtc *crtc)
   return crtc->idx;
 }
 
+static void
+read_gamma_state (MetaKmsCrtc       *crtc,
+                  MetaKmsImplDevice *impl_device,
+                  drmModeCrtc       *drm_crtc)
+{
+  MetaKmsCrtcState *current_state = &crtc->current_state;
+
+  if (current_state->gamma.size != drm_crtc->gamma_size)
+    {
+      current_state->gamma.size = drm_crtc->gamma_size;
+
+      current_state->gamma.red = g_realloc_n (current_state->gamma.red,
+                                              drm_crtc->gamma_size,
+                                              sizeof (uint16_t));
+      current_state->gamma.green = g_realloc_n (current_state->gamma.green,
+                                                drm_crtc->gamma_size,
+                                                sizeof (uint16_t));
+      current_state->gamma.blue = g_realloc_n (current_state->gamma.blue,
+                                               drm_crtc->gamma_size,
+                                               sizeof (uint16_t));
+    }
+
+  drmModeCrtcGetGamma (meta_kms_impl_device_get_fd (impl_device),
+                       crtc->id,
+                       current_state->gamma.size,
+                       current_state->gamma.red,
+                       current_state->gamma.green,
+                       current_state->gamma.blue);
+}
+
 static void
 meta_kms_crtc_read_state (MetaKmsCrtc       *crtc,
                           MetaKmsImplDevice *impl_device,
@@ -79,6 +120,8 @@ meta_kms_crtc_read_state (MetaKmsCrtc       *crtc,
     .is_drm_mode_valid = drm_crtc->mode_valid,
     .drm_mode = drm_crtc->mode,
   };
+
+  read_gamma_state (crtc, impl_device, drm_crtc);
 }
 
 void
@@ -109,6 +152,18 @@ meta_kms_crtc_new (MetaKmsImplDevice *impl_device,
   return crtc;
 }
 
+static void
+meta_kms_crtc_finalize (GObject *object)
+{
+  MetaKmsCrtc *crtc = META_KMS_CRTC (object);
+
+  g_clear_pointer (&crtc->current_state.gamma.red, g_free);
+  g_clear_pointer (&crtc->current_state.gamma.green, g_free);
+  g_clear_pointer (&crtc->current_state.gamma.blue, g_free);
+
+  G_OBJECT_CLASS (meta_kms_crtc_parent_class)->finalize (object);
+}
+
 static void
 meta_kms_crtc_init (MetaKmsCrtc *crtc)
 {
@@ -117,4 +172,7 @@ meta_kms_crtc_init (MetaKmsCrtc *crtc)
 static void
 meta_kms_crtc_class_init (MetaKmsCrtcClass *klass)
 {
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = meta_kms_crtc_finalize;
 }

src/backends/native/meta-kms-crtc.h

@@ -36,6 +36,14 @@ typedef struct _MetaKmsCrtcState
   uint32_t common_possible_crtcs;
   uint32_t common_possible_clones;
   uint32_t encoder_device_idxs;
+
+  struct {
+    uint16_t *red;
+    uint16_t *green;
+    uint16_t *blue;
+
+    int size;
+  } gamma;
 } MetaKmsCrtcState;
 
 #define META_TYPE_KMS_CRTC (meta_kms_crtc_get_type ())
@@ -43,6 +51,13 @@ G_DECLARE_FINAL_TYPE (MetaKmsCrtc, meta_kms_crtc,
                       META, KMS_CRTC,
                       GObject)
 
+void meta_kms_crtc_set_gamma (MetaKmsCrtc    *crtc,
+                              MetaKmsUpdate  *update,
+                              int             size,
+                              const uint16_t *red,
+                              const uint16_t *green,
+                              const uint16_t *blue);
+
 MetaKmsDevice * meta_kms_crtc_get_device (MetaKmsCrtc *crtc);
 
 const MetaKmsCrtcState * meta_kms_crtc_get_current_state (MetaKmsCrtc *crtc);

src/backends/native/meta-kms-impl-simple.c

@@ -284,6 +284,35 @@ process_mode_set (MetaKmsImpl     *impl,
   return TRUE;
 }
 
+static gboolean
+process_crtc_gamma (MetaKmsImpl       *impl,
+                    MetaKmsCrtcGamma  *gamma,
+                    GError           **error)
+{
+  MetaKmsCrtc *crtc = gamma->crtc;
+  MetaKmsDevice *device = meta_kms_crtc_get_device (crtc);
+  MetaKmsImplDevice *impl_device = meta_kms_device_get_impl_device (device);
+  int fd;
+  int ret;
+
+  fd = meta_kms_impl_device_get_fd (impl_device);
+  ret = drmModeCrtcSetGamma (fd, meta_kms_crtc_get_id (crtc),
+                             gamma->size,
+                             gamma->red,
+                             gamma->green,
+                             gamma->blue);
+  if (ret != 0)
+    {
+      g_set_error (error, G_IO_ERROR, g_io_error_from_errno (-ret),
+                   "drmModeCrtcSetGamma on CRTC %u failed: %s",
+                   meta_kms_crtc_get_id (crtc),
+                   g_strerror (-ret));
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
 static gboolean
 is_timestamp_earlier_than (uint64_t ts1,
                            uint64_t ts2)
@@ -708,6 +737,14 @@ meta_kms_impl_simple_process_update (MetaKmsImpl    *impl,
         goto discard_page_flips;
     }
 
+  for (l = meta_kms_update_get_crtc_gammas (update); l; l = l->next)
+    {
+      MetaKmsCrtcGamma *gamma = l->data;
+
+      if (!process_crtc_gamma (impl, gamma, error))
+        goto discard_page_flips;
+    }
+
   for (l = meta_kms_update_get_page_flips (update); l; l = l->next)
     {
       MetaKmsPageFlip *page_flip = l->data;

src/backends/native/meta-kms-update-private.h

@@ -59,6 +59,15 @@ typedef struct _MetaKmsConnectorProperty
   uint64_t value;
 } MetaKmsConnectorProperty;
 
+typedef struct _MetaKmsCrtcGamma
+{
+  MetaKmsCrtc *crtc;
+  int size;
+  uint16_t *red;
+  uint16_t *green;
+  uint16_t *blue;
+} MetaKmsCrtcGamma;
+
 typedef struct _MetaKmsPageFlip
 {
   MetaKmsCrtc *crtc;
@@ -77,6 +86,13 @@ void meta_kms_update_set_connector_property (MetaKmsUpdate    *update,
                                              uint32_t          prop_id,
                                              uint64_t          value);
 
+void meta_kms_update_set_crtc_gamma (MetaKmsUpdate  *update,
+                                     MetaKmsCrtc    *crtc,
+                                     int             size,
+                                     const uint16_t *red,
+                                     const uint16_t *green,
+                                     const uint16_t *blue);
+
 void meta_kms_plane_assignment_set_plane_property (MetaKmsPlaneAssignment *plane_assignment,
                                                    uint32_t                prop_id,
                                                    uint64_t                value);
@@ -89,6 +105,8 @@ GList * meta_kms_update_get_page_flips (MetaKmsUpdate *update);
 
 GList * meta_kms_update_get_connector_properties (MetaKmsUpdate *update);
 
+GList * meta_kms_update_get_crtc_gammas (MetaKmsUpdate *update);
+
 gboolean meta_kms_update_has_mode_set (MetaKmsUpdate *update);
 
 #endif /* META_KMS_UPDATE_PRIVATE_H */

src/backends/native/meta-kms-update.c

@@ -34,6 +34,7 @@ struct _MetaKmsUpdate
   GList *plane_assignments;
   GList *page_flips;
   GList *connector_properties;
+  GList *crtc_gammas;
 };
 
 static MetaKmsProperty *
@@ -142,6 +143,39 @@ meta_kms_update_set_connector_property (MetaKmsUpdate    *update,
                                                  prop);
 }
 
+static void
+meta_kms_crtc_gamma_free (MetaKmsCrtcGamma *gamma)
+{
+  g_free (gamma->red);
+  g_free (gamma->green);
+  g_free (gamma->blue);
+  g_free (gamma);
+}
+
+void
+meta_kms_update_set_crtc_gamma (MetaKmsUpdate  *update,
+                                MetaKmsCrtc    *crtc,
+                                int             size,
+                                const uint16_t *red,
+                                const uint16_t *green,
+                                const uint16_t *blue)
+{
+  MetaKmsCrtcGamma *gamma;
+
+  g_assert (!meta_kms_update_is_sealed (update));
+
+  gamma = g_new0 (MetaKmsCrtcGamma, 1);
+  *gamma = (MetaKmsCrtcGamma) {
+    .crtc = crtc,
+    .size = size,
+    .red = g_memdup (red, size * sizeof *red),
+    .green = g_memdup (green, size * sizeof *green),
+    .blue = g_memdup (blue, size * sizeof *blue),
+  };
+
+  update->crtc_gammas = g_list_prepend (update->crtc_gammas, gamma);
+}
+
 void
 meta_kms_update_page_flip (MetaKmsUpdate                 *update,
                            MetaKmsCrtc                   *crtc,
@@ -225,6 +259,12 @@ meta_kms_update_get_connector_properties (MetaKmsUpdate *update)
   return update->connector_properties;
 }
 
+GList *
+meta_kms_update_get_crtc_gammas (MetaKmsUpdate *update)
+{
+  return update->crtc_gammas;
+}
+
 gboolean
 meta_kms_update_has_mode_set (MetaKmsUpdate *update)
 {
@@ -258,6 +298,7 @@ meta_kms_update_free (MetaKmsUpdate *update)
                     (GDestroyNotify) meta_kms_mode_set_free);
   g_list_free_full (update->page_flips, g_free);
   g_list_free_full (update->connector_properties, g_free);
+  g_list_free_full (update->crtc_gammas, (GDestroyNotify) meta_kms_crtc_gamma_free);
 
   g_free (update);
 }

src/backends/native/meta-monitor-manager-kms.c

@@ -367,20 +367,16 @@ meta_monitor_manager_kms_get_crtc_gamma (MetaMonitorManager  *manager,
                                          unsigned short     **green,
                                          unsigned short     **blue)
 {
-  MetaGpu *gpu = meta_crtc_get_gpu (crtc);
-  int kms_fd = meta_gpu_kms_get_fd (META_GPU_KMS (gpu));
-  drmModeCrtc *kms_crtc;
+  MetaKmsCrtc *kms_crtc;
+  const MetaKmsCrtcState *crtc_state;
 
-  kms_crtc = drmModeGetCrtc (kms_fd, crtc->crtc_id);
+  kms_crtc = meta_crtc_kms_get_kms_crtc (crtc);
+  crtc_state = meta_kms_crtc_get_current_state (kms_crtc);
 
-  *size = kms_crtc->gamma_size;
-  *red = g_new (unsigned short, *size);
-  *green = g_new (unsigned short, *size);
-  *blue = g_new (unsigned short, *size);
-
-  drmModeCrtcGetGamma (kms_fd, crtc->crtc_id, *size, *red, *green, *blue);
-
-  drmModeFreeCrtc (kms_crtc);
+  *size = crtc_state->gamma.size;
+  *red = g_memdup (crtc_state->gamma.red, *size * sizeof **red);
+  *green = g_memdup (crtc_state->gamma.green, *size * sizeof **green);
+  *blue = g_memdup (crtc_state->gamma.blue, *size * sizeof **blue);
 }
 
 static char *
@@ -453,20 +449,25 @@ meta_monitor_manager_kms_set_crtc_gamma (MetaMonitorManager *manager,
                                          unsigned short     *green,
                                          unsigned short     *blue)
 {
-  MetaGpu *gpu = meta_crtc_get_gpu (crtc);
-  int kms_fd = meta_gpu_kms_get_fd (META_GPU_KMS (gpu));
+  MetaBackend *backend = meta_monitor_manager_get_backend (manager);
+  MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend);
+  MetaKms *kms = meta_backend_native_get_kms (backend_native);
+  MetaKmsCrtc *kms_crtc;
   g_autofree char *gamma_ramp_string = NULL;
-  int ret;
+  MetaKmsUpdate *kms_update;
+  g_autoptr (GError) error = NULL;
 
   gamma_ramp_string = generate_gamma_ramp_string (size, red, green, blue);
   g_debug ("Setting CRTC (%ld) gamma to %s", crtc->crtc_id, gamma_ramp_string);
 
-  ret = drmModeCrtcSetGamma (kms_fd, crtc->crtc_id, size, red, green, blue);
-  if (ret != 0)
-    {
-      g_warning ("Failed to set CRTC (%ld) Gamma: %s",
-                 crtc->crtc_id, g_strerror (-ret));
-    }
+  kms_update = meta_kms_ensure_pending_update (kms);
+
+  kms_crtc = meta_crtc_kms_get_kms_crtc (crtc);
+  meta_kms_crtc_set_gamma (kms_crtc, kms_update,
+                           size, red, green, blue);
+
+  if (!meta_kms_post_pending_update_sync (kms, &error))
+    g_warning ("Failed to CRTC gamma: %s", error->message);
 }
 
 static void