[mutter] DisplayConfig: make the dummy backend writable

[Giovanni Campagna <gcampagna src gnome org>]

commit c354e7e81b8ee1b3796838d609fd9a296b8e337c
Author: Giovanni Campagna <gcampagn redhat com>
Date:   Tue Jul 23 10:07:52 2013 +0200

    DisplayConfig: make the dummy backend writable
    
    Add a number of dummy outputs and modes to the dummy backend,
    and implement the writing bits.
    The only visible effect is that you can change the screen size,
    which resizes the output window.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=705670

 src/core/monitor-private.h |    3 +
 src/core/monitor.c         |  261 ++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 233 insertions(+), 31 deletions(-)
---
diff --git a/src/core/monitor-private.h b/src/core/monitor-private.h
index c159d2b..c66315a 100644
--- a/src/core/monitor-private.h
+++ b/src/core/monitor-private.h
@@ -73,6 +73,9 @@ struct _MetaOutput
   MetaOutput **possible_clones;
   unsigned int n_possible_clones;
 
+  /* Used when changing configuration */
+  gboolean is_dirty;
+
   /* The low-level bits used to build the high-level info
      in MetaMonitorInfo
 
diff --git a/src/core/monitor.c b/src/core/monitor.c
index 0a3aba1..78c1241 100644
--- a/src/core/monitor.c
+++ b/src/core/monitor.c
@@ -124,9 +124,22 @@ static int signals[SIGNALS_LAST];
 
 G_DEFINE_TYPE (MetaMonitorManager, meta_monitor_manager, G_TYPE_OBJECT);
 
+static void invalidate_logical_config (MetaMonitorManager *manager);
+
 static void
 make_dummy_monitor_config (MetaMonitorManager *manager)
 {
+  /* The dummy monitor config has:
+     - one enabled output, LVDS, primary, at 0x0 and 1024x768
+     - one free CRTC
+     - two disabled outputs
+     - three modes, 1024x768, 800x600 and 640x480
+     - no clones are possible (use different CRTCs)
+
+     Low-level IDs should be assigned sequentially, to
+     mimick what XRandR and KMS do
+  */
+
   manager->backend = META_BACKEND_DUMMY;
 
   manager->max_screen_width = 65535;
@@ -134,18 +147,28 @@ make_dummy_monitor_config (MetaMonitorManager *manager)
   manager->screen_width = 1024;
   manager->screen_height = 768;
 
-  manager->modes = g_new0 (MetaMonitorMode, 1);
-  manager->n_modes = 1;
+  manager->modes = g_new0 (MetaMonitorMode, 3);
+  manager->n_modes = 3;
 
   manager->modes[0].mode_id = 1;
-  manager->modes[0].width = manager->screen_width;
-  manager->modes[0].height = manager->screen_height;
+  manager->modes[0].width = 1024;
+  manager->modes[0].height = 768;
   manager->modes[0].refresh_rate = 60.0;
 
-  manager->crtcs = g_new0 (MetaCRTC, 1);
-  manager->n_crtcs = 1;
+  manager->modes[1].mode_id = 2;
+  manager->modes[1].width = 800;
+  manager->modes[1].height = 600;
+  manager->modes[1].refresh_rate = 60.0;
+
+  manager->modes[2].mode_id = 3;
+  manager->modes[2].width = 640;
+  manager->modes[2].height = 480;
+  manager->modes[2].refresh_rate = 60.0;
 
-  manager->crtcs[0].crtc_id = 2;
+  manager->crtcs = g_new0 (MetaCRTC, 2);
+  manager->n_crtcs = 2;
+
+  manager->crtcs[0].crtc_id = 4;
   manager->crtcs[0].rect.x = 0;
   manager->crtcs[0].rect.y = 0;
   manager->crtcs[0].rect.width = manager->modes[0].width;
@@ -154,11 +177,20 @@ make_dummy_monitor_config (MetaMonitorManager *manager)
   manager->crtcs[0].is_dirty = FALSE;
   manager->crtcs[0].logical_monitor = NULL;
 
-  manager->outputs = g_new0 (MetaOutput, 1);
-  manager->n_outputs = 1;
+  manager->crtcs[1].crtc_id = 5;
+  manager->crtcs[1].rect.x = 0;
+  manager->crtcs[1].rect.y = 0;
+  manager->crtcs[1].rect.width = 0;
+  manager->crtcs[1].rect.height = 0;
+  manager->crtcs[1].current_mode = NULL;
+  manager->crtcs[1].is_dirty = FALSE;
+  manager->crtcs[1].logical_monitor = NULL;
+
+  manager->outputs = g_new0 (MetaOutput, 3);
+  manager->n_outputs = 3;
 
   manager->outputs[0].crtc = &manager->crtcs[0];
-  manager->outputs[0].output_id = 3;
+  manager->outputs[0].output_id = 6;
   manager->outputs[0].name = g_strdup ("LVDS");
   manager->outputs[0].vendor = g_strdup ("unknown");
   manager->outputs[0].product = g_strdup ("unknown");
@@ -167,14 +199,61 @@ make_dummy_monitor_config (MetaMonitorManager *manager)
   manager->outputs[0].height_mm = 125;
   manager->outputs[0].subpixel_order = COGL_SUBPIXEL_ORDER_UNKNOWN;
   manager->outputs[0].preferred_mode = &manager->modes[0];
-  manager->outputs[0].n_modes = 1;
-  manager->outputs[0].modes = g_new0 (MetaMonitorMode *, 1);
+  manager->outputs[0].n_modes = 3;
+  manager->outputs[0].modes = g_new0 (MetaMonitorMode *, 3);
   manager->outputs[0].modes[0] = &manager->modes[0];
-  manager->outputs[0].n_possible_crtcs = 1;
-  manager->outputs[0].possible_crtcs = g_new0 (MetaCRTC *, 1);
+  manager->outputs[0].modes[1] = &manager->modes[1];
+  manager->outputs[0].modes[2] = &manager->modes[2];
+  manager->outputs[0].n_possible_crtcs = 2;
+  manager->outputs[0].possible_crtcs = g_new0 (MetaCRTC *, 2);
   manager->outputs[0].possible_crtcs[0] = &manager->crtcs[0];
+  manager->outputs[0].possible_crtcs[1] = &manager->crtcs[1];
   manager->outputs[0].n_possible_clones = 0;
   manager->outputs[0].possible_clones = g_new0 (MetaOutput *, 0);
+
+  manager->outputs[1].crtc = NULL;
+  manager->outputs[1].output_id = 7;
+  manager->outputs[1].name = g_strdup ("HDMI");
+  manager->outputs[1].vendor = g_strdup ("unknown");
+  manager->outputs[1].product = g_strdup ("unknown");
+  manager->outputs[1].serial = g_strdup ("");
+  manager->outputs[1].width_mm = 510;
+  manager->outputs[1].height_mm = 287;
+  manager->outputs[1].subpixel_order = COGL_SUBPIXEL_ORDER_UNKNOWN;
+  manager->outputs[1].preferred_mode = &manager->modes[0];
+  manager->outputs[1].n_modes = 3;
+  manager->outputs[1].modes = g_new0 (MetaMonitorMode *, 3);
+  manager->outputs[1].modes[0] = &manager->modes[0];
+  manager->outputs[1].modes[1] = &manager->modes[1];
+  manager->outputs[1].modes[2] = &manager->modes[2];
+  manager->outputs[1].n_possible_crtcs = 2;
+  manager->outputs[1].possible_crtcs = g_new0 (MetaCRTC *, 2);
+  manager->outputs[1].possible_crtcs[0] = &manager->crtcs[0];
+  manager->outputs[1].possible_crtcs[1] = &manager->crtcs[1];
+  manager->outputs[1].n_possible_clones = 0;
+  manager->outputs[1].possible_clones = g_new0 (MetaOutput *, 0);
+
+  manager->outputs[2].crtc = NULL;
+  manager->outputs[2].output_id = 8;
+  manager->outputs[2].name = g_strdup ("VGA");
+  manager->outputs[2].vendor = g_strdup ("unknown");
+  manager->outputs[2].product = g_strdup ("unknown");
+  manager->outputs[2].serial = g_strdup ("");
+  manager->outputs[2].width_mm = 309;
+  manager->outputs[2].height_mm = 174;
+  manager->outputs[2].subpixel_order = COGL_SUBPIXEL_ORDER_UNKNOWN;
+  manager->outputs[2].preferred_mode = &manager->modes[0];
+  manager->outputs[2].n_modes = 3;
+  manager->outputs[2].modes = g_new0 (MetaMonitorMode *, 3);
+  manager->outputs[2].modes[0] = &manager->modes[0];
+  manager->outputs[2].modes[1] = &manager->modes[1];
+  manager->outputs[2].modes[2] = &manager->modes[2];
+  manager->outputs[2].n_possible_crtcs = 2;
+  manager->outputs[2].possible_crtcs = g_new0 (MetaCRTC *, 2);
+  manager->outputs[2].possible_crtcs[0] = &manager->crtcs[0];
+  manager->outputs[2].possible_crtcs[1] = &manager->crtcs[1];
+  manager->outputs[2].n_possible_clones = 0;
+  manager->outputs[2].possible_clones = g_new0 (MetaOutput *, 0);
 }
 
 #ifdef HAVE_RANDR
@@ -927,7 +1006,10 @@ apply_config_xrandr (MetaMonitorManager *manager,
       MetaCRTC *crtc = &manager->crtcs[i];
 
       if (crtc->is_dirty)
-        continue;
+        {
+          crtc->is_dirty = FALSE;
+          continue;
+        }
       if (crtc->current_mode == NULL)
         continue;
 
@@ -943,6 +1025,117 @@ apply_config_xrandr (MetaMonitorManager *manager,
 }
 #endif
 
+static void
+apply_config_dummy (MetaMonitorManager *manager,
+                    GVariantIter       *crtcs,
+                    GVariantIter       *outputs)
+{
+  GVariant *nested_outputs, *properties;
+  guint crtc_id, output_id, transform;
+  int new_mode, x, y;
+  unsigned i;
+  int screen_width = 0, screen_height = 0;
+
+  while (g_variant_iter_loop (crtcs, "(uiiiu aua{sv})",
+                              &crtc_id, &new_mode, &x, &y,
+                              &transform, &nested_outputs, NULL))
+    {
+      MetaCRTC *crtc = &manager->crtcs[crtc_id];
+      crtc->is_dirty = TRUE;
+
+      if (new_mode == -1)
+        {
+          crtc->rect.x = 0;
+          crtc->rect.y = 0;
+          crtc->rect.width = 0;
+          crtc->rect.height = 0;
+          crtc->current_mode = NULL;
+        }
+      else
+        {
+          MetaMonitorMode *mode;
+          MetaOutput *output;
+          int i, n_outputs;
+          guint output_id;
+
+          mode = &manager->modes[new_mode];
+
+          crtc->rect.x = x;
+          crtc->rect.y = y;
+          crtc->rect.width = mode->width;
+          crtc->rect.height = mode->height;
+          crtc->current_mode = mode;
+
+          screen_width = MAX (screen_width, x + mode->width);
+          screen_height = MAX (screen_height, y + mode->height);
+
+          n_outputs = g_variant_n_children (nested_outputs);
+          for (i = 0; i < n_outputs; i++)
+            {
+              g_variant_get_child (nested_outputs, i, "u", &output_id);
+
+              output = &manager->outputs[output_id];
+
+              output->is_dirty = TRUE;
+              output->crtc = crtc;
+            }
+        }
+    }
+
+  while (g_variant_iter_loop (outputs, "(u a{sv})",
+                              &output_id, &properties))
+    {
+      MetaOutput *output = &manager->outputs[output_id];
+      gboolean primary, presentation;
+
+      if (g_variant_lookup (properties, "primary", "b", &primary))
+        output->is_primary = primary;
+
+      if (g_variant_lookup (properties, "presentation", "b", &presentation))
+        output->is_presentation = presentation;
+    }
+
+  /* Disable CRTCs not mentioned in the list */
+  for (i = 0; i < manager->n_crtcs; i++)
+    {
+      MetaCRTC *crtc = &manager->crtcs[i];
+
+      crtc->logical_monitor = NULL;
+
+      if (crtc->is_dirty)
+        {
+          crtc->is_dirty = FALSE;
+          continue;
+        }
+
+      crtc->rect.x = 0;
+      crtc->rect.y = 0;
+      crtc->rect.width = 0;
+      crtc->rect.height = 0;
+      crtc->current_mode = NULL;
+    }
+
+  /* Disable outputs not mentioned in the list */
+  for (i = 0; i < manager->n_outputs; i++)
+    {
+      MetaOutput *output = &manager->outputs[i];
+
+      if (output->is_dirty)
+        {
+          output->is_dirty = FALSE;
+          continue;
+        }
+
+      output->crtc = NULL;
+      output->is_primary = FALSE;
+    }
+
+  manager->screen_width = screen_width;
+  manager->screen_height = screen_height;
+
+  invalidate_logical_config (manager);
+}
+
 static gboolean
 handle_apply_configuration  (MetaDBusDisplayConfig *skeleton,
                              GDBusMethodInvocation *invocation,
@@ -974,14 +1167,6 @@ handle_apply_configuration  (MetaDBusDisplayConfig *skeleton,
       return TRUE;
     }
 
-  if (manager->backend != META_BACKEND_XRANDR)
-    {
-      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
-                                             G_DBUS_ERROR_NOT_SUPPORTED,
-                                             "Changing configuration is not supported by the backend");
-      return TRUE;
-    }
-
   /* Validate all arguments */
   g_variant_iter_init (&crtc_iter, crtcs);
   while (g_variant_iter_loop (&crtc_iter, "(uiiiuaua{sv})",
@@ -1091,7 +1276,11 @@ handle_apply_configuration  (MetaDBusDisplayConfig *skeleton,
 
   g_variant_iter_init (&crtc_iter, crtcs);
   g_variant_iter_init (&output_iter, outputs);
-  apply_config_xrandr (manager, &crtc_iter, &output_iter);
+
+  if (manager->backend == META_BACKEND_XRANDR)
+    apply_config_xrandr (manager, &crtc_iter, &output_iter);
+  else
+    apply_config_dummy (manager, &crtc_iter, &output_iter);
 
   meta_dbus_display_config_complete_apply_configuration (skeleton, invocation);
   return TRUE;
@@ -1197,13 +1386,28 @@ meta_monitor_manager_get_screen_size (MetaMonitorManager *manager,
   *height = manager->screen_height;
 }
 
+static void
+invalidate_logical_config (MetaMonitorManager *manager)
+{
+  MetaMonitorInfo *old_monitor_infos;
+
+  old_monitor_infos = manager->monitor_infos;
+
+  manager->serial++;
+  make_logical_config (manager);
+
+  g_signal_emit (manager, signals[MONITORS_CHANGED], 0);
+
+  g_free (old_monitor_infos);
+}
+
 gboolean
 meta_monitor_manager_handle_xevent (MetaMonitorManager *manager,
                                     XEvent             *event)
 {
   MetaOutput *old_outputs;
   MetaCRTC *old_crtcs;
-  MetaMonitorInfo *old_monitor_infos;
+
   MetaMonitorMode *old_modes;
   int n_old_outputs;
 
@@ -1219,17 +1423,12 @@ meta_monitor_manager_handle_xevent (MetaMonitorManager *manager,
   /* Save the old structures, so they stay valid during the update */
   old_outputs = manager->outputs;
   n_old_outputs = manager->n_outputs;
-  old_monitor_infos = manager->monitor_infos;
   old_modes = manager->modes;
   old_crtcs = manager->crtcs;
 
-  manager->serial ++;
   read_current_config (manager);
-  make_logical_config (manager);
+  invalidate_logical_config (manager);
 
-  g_signal_emit (manager, signals[MONITORS_CHANGED], 0);
-
-  g_free (old_monitor_infos);
   free_output_array (old_outputs, n_old_outputs);
   g_free (old_modes);
   g_free (old_crtcs);