backends: Excise MetaStageView to its own file

It was implemented together with MetaStageImpl, move it to a separate
file.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1862>

6 files changed, 267 insertions, 179 deletions

diff --git a/src/backends/meta-renderer-view.h b/src/backends/meta-renderer-view.h
index 703c3aabb..3f21c7c48 100644
--- a/src/backends/meta-renderer-view.h
+++ b/src/backends/meta-renderer-view.h
@@ -20,6 +20,7 @@
 
 #include "backends/meta-monitor-manager-private.h"
 #include "backends/meta-stage-impl-private.h"
+#include "backends/meta-stage-view-private.h"
 
 #define META_TYPE_RENDERER_VIEW (meta_renderer_view_get_type ())
 G_DECLARE_FINAL_TYPE (MetaRendererView, meta_renderer_view,
diff --git a/src/backends/meta-stage-impl-private.h b/src/backends/meta-stage-impl-private.h
index 678018551..ab3e0d391 100644
--- a/src/backends/meta-stage-impl-private.h
+++ b/src/backends/meta-stage-impl-private.h
@@ -46,15 +46,6 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC (MetaStageImpl, g_object_unref)
 
 #define META_TYPE_STAGE_VIEW (meta_stage_view_get_type ())
 
-G_DECLARE_DERIVABLE_TYPE (MetaStageView, meta_stage_view,
-                          META, STAGE_VIEW,
-                          ClutterStageView)
-
-struct _MetaStageViewClass
-{
-  ClutterStageViewClass parent_class;
-};
-
 struct _MetaStageImpl
 {
   GObject parent_instance;
diff --git a/src/backends/meta-stage-impl.c b/src/backends/meta-stage-impl.c
index f1ec55c83..447d267da 100644
--- a/src/backends/meta-stage-impl.c
+++ b/src/backends/meta-stage-impl.c
@@ -32,26 +32,13 @@
 #include <stdlib.h>
 #include <math.h>
 
+#include "backends/meta-stage-view-private.h"
 #include "clutter/clutter-mutter.h"
 #include "cogl/cogl.h"
 #include "core/util-private.h"
 
 #define MAX_STACK_RECTS 256
 
-typedef struct _MetaStageViewPrivate
-{
-  /* Damage history, in stage view render target framebuffer coordinate space.
-   */
-  ClutterDamageHistory *damage_history;
-
-  guint notify_presented_handle_id;
-
-  CoglFrameClosure *frame_cb_closure;
-} MetaStageViewPrivate;
-
-G_DEFINE_TYPE_WITH_PRIVATE (MetaStageView, meta_stage_view,
-                            CLUTTER_TYPE_STAGE_VIEW)
-
 typedef struct _MetaStageImplPrivate
 {
   int64_t global_frame_counter;
@@ -211,26 +198,6 @@ paint_damage_region (ClutterStageWindow *stage_window,
   cogl_framebuffer_pop_matrix (framebuffer);
 }
 
-typedef struct _NotifyPresentedClosure
-{
-  ClutterStageView *view;
-  ClutterFrameInfo frame_info;
-} NotifyPresentedClosure;
-
-static gboolean
-notify_presented_idle (gpointer user_data)
-{
-  NotifyPresentedClosure *closure = user_data;
-  MetaStageView *view = META_STAGE_VIEW (closure->view);
-  MetaStageViewPrivate *view_priv =
-    meta_stage_view_get_instance_private (view);
-
-  view_priv->notify_presented_handle_id = 0;
-  clutter_stage_view_notify_presented (closure->view, &closure->frame_info);
-
-  return G_SOURCE_REMOVE;
-}
-
 static void
 swap_framebuffer (ClutterStageWindow *stage_window,
                   ClutterStageView   *stage_view,
@@ -292,28 +259,10 @@ swap_framebuffer (ClutterStageWindow *stage_window,
   else
     {
       MetaStageView *view = META_STAGE_VIEW (stage_view);
-      MetaStageViewPrivate *view_priv =
-        meta_stage_view_get_instance_private (view);
-      NotifyPresentedClosure *closure;
 
       g_debug ("fake offscreen swap (framebuffer: %p)", framebuffer);
-
-      closure = g_new0 (NotifyPresentedClosure, 1);
-      closure->view = stage_view;
-      closure->frame_info = (ClutterFrameInfo) {
-        .frame_counter = priv->global_frame_counter,
-        .refresh_rate = clutter_stage_view_get_refresh_rate (stage_view),
-        .presentation_time = g_get_monotonic_time (),
-        .flags = CLUTTER_FRAME_INFO_FLAG_NONE,
-        .sequence = 0,
-      };
+      meta_stage_view_perform_fake_swap (view, priv->global_frame_counter);
       priv->global_frame_counter++;
-
-      g_warn_if_fail (view_priv->notify_presented_handle_id == 0);
-      view_priv->notify_presented_handle_id =
-        g_idle_add_full (G_PRIORITY_DEFAULT,
-                         notify_presented_idle,
-                         closure, g_free);
     }
 }
 
@@ -438,8 +387,6 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
 {
   ClutterStageWindow *stage_window = CLUTTER_STAGE_WINDOW (stage_impl);
   MetaStageView *view = META_STAGE_VIEW (stage_view);
-  MetaStageViewPrivate *view_priv =
-    meta_stage_view_get_instance_private (view);
   CoglFramebuffer *fb = clutter_stage_view_get_framebuffer (stage_view);
   CoglFramebuffer *onscreen = clutter_stage_view_get_onscreen (stage_view);
   cairo_rectangle_int_t view_rect;
@@ -453,6 +400,7 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
   cairo_region_t *fb_clip_region;
   cairo_region_t *swap_region;
   ClutterDrawDebugFlag paint_debug_flags;
+  ClutterDamageHistory *damage_history;
   float fb_scale;
   int fb_width, fb_height;
   int buffer_age = 0;
@@ -478,11 +426,12 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
   else
     is_full_redraw = FALSE;
 
+  damage_history = meta_stage_view_get_damage_history (view);
+
   if (has_buffer_age)
     {
       buffer_age = cogl_onscreen_get_buffer_age (COGL_ONSCREEN (onscreen));
-      if (!clutter_damage_history_is_age_valid (view_priv->damage_history,
-                                                buffer_age))
+      if (!clutter_damage_history_is_age_valid (damage_history, buffer_age))
         {
           g_debug ("Invalid back buffer(age=%d): forcing full redraw",
                    buffer_age);
@@ -540,8 +489,7 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
   swap_with_damage = FALSE;
   if (has_buffer_age)
     {
-      clutter_damage_history_record (view_priv->damage_history,
-                                     fb_clip_region);
+      clutter_damage_history_record (damage_history, fb_clip_region);
 
       if (use_clipped_redraw)
         {
@@ -552,7 +500,7 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
               const cairo_region_t *old_damage;
 
               old_damage =
-                clutter_damage_history_lookup (view_priv->damage_history, age);
+                clutter_damage_history_lookup (damage_history, age);
               cairo_region_union (fb_clip_region, old_damage);
             }
 
@@ -563,7 +511,7 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl    *stage_impl,
           swap_with_damage = TRUE;
         }
 
-      clutter_damage_history_step (view_priv->damage_history);
+      clutter_damage_history_step (damage_history);
     }
 
   if (use_clipped_redraw)
@@ -797,112 +745,3 @@ static void
 meta_stage_impl_init (MetaStageImpl *stage)
 {
 }
-
-static void
-frame_cb (CoglOnscreen  *onscreen,
-          CoglFrameEvent frame_event,
-          CoglFrameInfo *frame_info,
-          void          *user_data)
-{
-  ClutterStageView *stage_view = user_data;
-
-  if (frame_event == COGL_FRAME_EVENT_SYNC)
-    return;
-
-  if (cogl_frame_info_get_is_symbolic (frame_info))
-    {
-      clutter_stage_view_notify_ready (stage_view);
-    }
-  else
-    {
-      ClutterFrameInfo clutter_frame_info;
-      ClutterFrameInfoFlag flags = CLUTTER_FRAME_INFO_FLAG_NONE;
-
-      if (cogl_frame_info_is_hw_clock (frame_info))
-        flags |= CLUTTER_FRAME_INFO_FLAG_HW_CLOCK;
-
-      if (cogl_frame_info_is_zero_copy (frame_info))
-        flags |= CLUTTER_FRAME_INFO_FLAG_ZERO_COPY;
-
-      if (cogl_frame_info_is_vsync (frame_info))
-        flags |= CLUTTER_FRAME_INFO_FLAG_VSYNC;
-
-      clutter_frame_info = (ClutterFrameInfo) {
-        .frame_counter = cogl_frame_info_get_global_frame_counter (frame_info),
-        .refresh_rate = cogl_frame_info_get_refresh_rate (frame_info),
-        .presentation_time =
-          cogl_frame_info_get_presentation_time_us (frame_info),
-        .flags = flags,
-        .sequence = cogl_frame_info_get_sequence (frame_info),
-        .gpu_rendering_duration_ns =
-          cogl_frame_info_get_rendering_duration_ns (frame_info),
-        .cpu_time_before_buffer_swap_us =
-          cogl_frame_info_get_time_before_buffer_swap_us (frame_info),
-      };
-      clutter_stage_view_notify_presented (stage_view, &clutter_frame_info);
-    }
-}
-
-static void
-meta_stage_view_dispose (GObject *object)
-{
-  MetaStageView *view = META_STAGE_VIEW (object);
-  MetaStageViewPrivate *view_priv =
-    meta_stage_view_get_instance_private (view);
-  ClutterStageView *stage_view = CLUTTER_STAGE_VIEW (view);
-
-  g_clear_handle_id (&view_priv->notify_presented_handle_id, g_source_remove);
-  g_clear_pointer (&view_priv->damage_history, clutter_damage_history_free);
-
-  if (view_priv->frame_cb_closure)
-    {
-      CoglFramebuffer *framebuffer;
-
-      framebuffer = clutter_stage_view_get_onscreen (stage_view);
-      cogl_onscreen_remove_frame_callback (COGL_ONSCREEN (framebuffer),
-                                           view_priv->frame_cb_closure);
-      view_priv->frame_cb_closure = NULL;
-    }
-
-  G_OBJECT_CLASS (meta_stage_view_parent_class)->dispose (object);
-}
-
-static void
-meta_stage_view_constructed (GObject *object)
-{
-  MetaStageView *view = META_STAGE_VIEW (object);
-  MetaStageViewPrivate *view_priv =
-    meta_stage_view_get_instance_private (view);
-  ClutterStageView *stage_view = CLUTTER_STAGE_VIEW (view);
-  CoglFramebuffer *framebuffer;
-
-  framebuffer = clutter_stage_view_get_onscreen (stage_view);
-  if (framebuffer && COGL_IS_ONSCREEN (framebuffer))
-    {
-      view_priv->frame_cb_closure =
-        cogl_onscreen_add_frame_callback (COGL_ONSCREEN (framebuffer),
-                                          frame_cb,
-                                          stage_view,
-                                          NULL);
-    }
-
-  G_OBJECT_CLASS (meta_stage_view_parent_class)->constructed (object);
-}
-
-static void
-meta_stage_view_init (MetaStageView *view)
-{
-  MetaStageViewPrivate *view_priv =
-    meta_stage_view_get_instance_private (view);
-
-  view_priv->damage_history = clutter_damage_history_new ();
-}
-
-static void
-meta_stage_view_class_init (MetaStageViewClass *klass)
-{
-  GObjectClass *object_class = G_OBJECT_CLASS (klass);
-
-  object_class->constructed = meta_stage_view_constructed;
-  object_class->dispose = meta_stage_view_dispose;
-}
diff --git a/src/backends/meta-stage-view-private.h b/src/backends/meta-stage-view-private.h
new file mode 100644
index 000000000..aaf3f31eb
--- /dev/null
+++ b/src/backends/meta-stage-view-private.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2007,2008,2009,2010,2011  Intel Corporation.
+ * Copyright (C) 2021 Red Hat
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Written by:
+ *  Matthew Allum
+ *  Robert Bragg
+ *  Neil Roberts
+ *  Emmanuele Bassi
+ *
+ */
+
+#ifndef META_STAGE_VIEW_H
+#define META_STAGE_VIEW_H
+
+#include <cairo.h>
+
+#include "clutter/clutter-mutter.h"
+
+G_BEGIN_DECLS
+
+#define META_TYPE_STAGE_VIEW (meta_stage_view_get_type ())
+
+G_DECLARE_DERIVABLE_TYPE (MetaStageView,
+                          meta_stage_view,
+                          META, STAGE_VIEW,
+                          ClutterStageView)
+
+struct _MetaStageViewClass
+{
+  ClutterStageViewClass parent_class;
+};
+
+ClutterDamageHistory * meta_stage_view_get_damage_history (MetaStageView *view);
+void meta_stage_view_perform_fake_swap (MetaStageView *view,
+                                        int64_t        counter);
+
+#endif /* META_STAGE_VIEW_H */
diff --git a/src/backends/meta-stage-view.c b/src/backends/meta-stage-view.c
new file mode 100644
index 000000000..473943196
--- /dev/null
+++ b/src/backends/meta-stage-view.c
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2007,2008,2009,2010,2011  Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+ * Authors:
+ *  Matthew Allum
+ *  Robert Bragg
+ *  Neil Roberts
+ *  Emmanuele Bassi
+ */
+
+#include "config.h"
+
+#include "meta-stage-view-private.h"
+
+typedef struct _MetaStageViewPrivate
+{
+  /* Damage history, in stage view render target framebuffer coordinate space.
+   */
+  ClutterDamageHistory *damage_history;
+
+  guint notify_presented_handle_id;
+
+  CoglFrameClosure *frame_cb_closure;
+} MetaStageViewPrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE (MetaStageView, meta_stage_view,
+                            CLUTTER_TYPE_STAGE_VIEW)
+
+static void
+frame_cb (CoglOnscreen  *onscreen,
+          CoglFrameEvent frame_event,
+          CoglFrameInfo *frame_info,
+          void          *user_data)
+{
+  ClutterStageView *view = user_data;
+
+  if (frame_event == COGL_FRAME_EVENT_SYNC)
+    return;
+
+  if (cogl_frame_info_get_is_symbolic (frame_info))
+    {
+      clutter_stage_view_notify_ready (view);
+    }
+  else
+    {
+      ClutterFrameInfo clutter_frame_info;
+      ClutterFrameInfoFlag flags = CLUTTER_FRAME_INFO_FLAG_NONE;
+
+      if (cogl_frame_info_is_hw_clock (frame_info))
+        flags |= CLUTTER_FRAME_INFO_FLAG_HW_CLOCK;
+
+      if (cogl_frame_info_is_zero_copy (frame_info))
+        flags |= CLUTTER_FRAME_INFO_FLAG_ZERO_COPY;
+
+      if (cogl_frame_info_is_vsync (frame_info))
+        flags |= CLUTTER_FRAME_INFO_FLAG_VSYNC;
+
+      clutter_frame_info = (ClutterFrameInfo) {
+        .frame_counter = cogl_frame_info_get_global_frame_counter (frame_info),
+        .refresh_rate = cogl_frame_info_get_refresh_rate (frame_info),
+        .presentation_time =
+          cogl_frame_info_get_presentation_time_us (frame_info),
+        .flags = flags,
+        .sequence = cogl_frame_info_get_sequence (frame_info),
+        .gpu_rendering_duration_ns =
+          cogl_frame_info_get_rendering_duration_ns (frame_info),
+        .cpu_time_before_buffer_swap_us =
+          cogl_frame_info_get_time_before_buffer_swap_us (frame_info),
+      };
+      clutter_stage_view_notify_presented (view, &clutter_frame_info);
+    }
+}
+
+static void
+meta_stage_view_dispose (GObject *object)
+{
+  MetaStageView *view = META_STAGE_VIEW (object);
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+  ClutterStageView *stage_view = CLUTTER_STAGE_VIEW (view);
+
+  g_clear_handle_id (&priv->notify_presented_handle_id, g_source_remove);
+  g_clear_pointer (&priv->damage_history, clutter_damage_history_free);
+
+  if (priv->frame_cb_closure)
+    {
+      CoglFramebuffer *framebuffer;
+
+      framebuffer = clutter_stage_view_get_onscreen (stage_view);
+      cogl_onscreen_remove_frame_callback (COGL_ONSCREEN (framebuffer),
+                                           priv->frame_cb_closure);
+      priv->frame_cb_closure = NULL;
+    }
+
+  G_OBJECT_CLASS (meta_stage_view_parent_class)->dispose (object);
+}
+
+static void
+meta_stage_view_constructed (GObject *object)
+{
+  MetaStageView *view = META_STAGE_VIEW (object);
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+  ClutterStageView *stage_view = CLUTTER_STAGE_VIEW (view);
+  CoglFramebuffer *framebuffer;
+
+  framebuffer = clutter_stage_view_get_onscreen (stage_view);
+  if (framebuffer && COGL_IS_ONSCREEN (framebuffer))
+    {
+      priv->frame_cb_closure =
+        cogl_onscreen_add_frame_callback (COGL_ONSCREEN (framebuffer),
+                                          frame_cb,
+                                          view,
+                                          NULL);
+    }
+
+  G_OBJECT_CLASS (meta_stage_view_parent_class)->constructed (object);
+}
+
+static void
+meta_stage_view_init (MetaStageView *view)
+{
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+
+  priv->damage_history = clutter_damage_history_new ();
+}
+
+static void
+meta_stage_view_class_init (MetaStageViewClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->constructed = meta_stage_view_constructed;
+  object_class->dispose = meta_stage_view_dispose;
+}
+
+ClutterDamageHistory *
+meta_stage_view_get_damage_history (MetaStageView *view)
+{
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+
+  return priv->damage_history;
+}
+
+typedef struct _NotifyPresentedClosure
+{
+  ClutterStageView *view;
+  ClutterFrameInfo frame_info;
+} NotifyPresentedClosure;
+
+static gboolean
+notify_presented_idle (gpointer user_data)
+{
+  NotifyPresentedClosure *closure = user_data;
+  MetaStageView *view = META_STAGE_VIEW (closure->view);
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+
+  priv->notify_presented_handle_id = 0;
+  clutter_stage_view_notify_presented (closure->view, &closure->frame_info);
+
+  return G_SOURCE_REMOVE;
+}
+
+void
+meta_stage_view_perform_fake_swap (MetaStageView *view,
+                                   int64_t        counter)
+{
+  ClutterStageView *clutter_view = CLUTTER_STAGE_VIEW (view);
+  MetaStageViewPrivate *priv =
+    meta_stage_view_get_instance_private (view);
+  NotifyPresentedClosure *closure;
+
+  closure = g_new0 (NotifyPresentedClosure, 1);
+  closure->view = clutter_view;
+  closure->frame_info = (ClutterFrameInfo) {
+    .frame_counter = counter,
+    .refresh_rate = clutter_stage_view_get_refresh_rate (clutter_view),
+    .presentation_time = g_get_monotonic_time (),
+    .flags = CLUTTER_FRAME_INFO_FLAG_NONE,
+    .sequence = 0,
+  };
+
+  g_warn_if_fail (priv->notify_presented_handle_id == 0);
+  priv->notify_presented_handle_id =
+    g_idle_add_full (G_PRIORITY_DEFAULT,
+                     notify_presented_idle,
+                     closure, g_free);
+}
diff --git a/src/meson.build b/src/meson.build
index 9968a277f..8ea2df0fa 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -236,6 +236,8 @@ mutter_sources = [
   'backends/meta-stage-impl.c',
   'backends/meta-stage-impl-private.h',
   'backends/meta-stage-private.h',
+  'backends/meta-stage-view.c',
+  'backends/meta-stage-view-private.h',
   'backends/meta-viewport-info.c',
   'backends/meta-viewport-info.h',
   'backends/meta-virtual-monitor.c',