ee-wayland: use frame callbacks exclusively to determine render timing

when running in a wayland compositor, the ideal mode of operation is to
only prepare/send frames when the compositor has finished with the previous
frame

to achieve this, manual rendering can be toggled upon creating and completing
a frame callback, ensuring that a canvas never has multiple pending buffers at
any given time

fix T2784

4 files changed, 24 insertions, 10 deletions

diff --git a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c
index 41b0112d57..2ba972f82b 100644
--- a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c
+++ b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c
@@ -1263,12 +1263,13 @@ _ecore_evas_wl_common_pre_render(Ecore_Evas *ee)
 static void
 _anim_cb_animate(void *data, struct wl_callback *callback, uint32_t serial EINA_UNUSED)
 {
-   Ecore_Evas_Engine_Wl_Data *wdata = data;
-
-   if ((wdata->anim_callback) && (callback != wdata->anim_callback)) return;
+   Ecore_Evas *ee = data;
+   Ecore_Evas_Engine_Wl_Data *wdata;
 
+   wdata = ee->engine.data;
    wl_callback_destroy(callback);
    wdata->anim_callback = NULL;
+   ecore_evas_manual_render_set(ee, 0);
 }
 
 static const struct wl_callback_listener _anim_listener =
@@ -1276,6 +1277,18 @@ static const struct wl_callback_listener _anim_listener =
    _anim_cb_animate
 };
 
+void
+_ecore_evas_wl_common_render_pre(void *data, Evas *evas EINA_UNUSED, void *event EINA_UNUSED)
+{
+   Ecore_Evas *ee = data;
+   Ecore_Evas_Engine_Wl_Data *wdata;
+
+   wdata = ee->engine.data;
+   wdata->anim_callback = wl_surface_frame(ecore_wl_window_surface_get(wdata->win));
+   wl_callback_add_listener(wdata->anim_callback, &_anim_listener, ee);
+   ecore_evas_manual_render_set(ee, 1);
+}
+
 void 
 _ecore_evas_wl_common_render_updates(void *data, Evas *evas EINA_UNUSED, void *event)
 {
@@ -1286,13 +1299,7 @@ _ecore_evas_wl_common_render_updates(void *data, Evas *evas EINA_UNUSED, void *e
 
    ee->in_async_render = EINA_FALSE;
 
-   if (_ecore_evas_wl_common_render_updates_process(ee, ev->updated_area))
-     {
-        Ecore_Evas_Engine_Wl_Data *wdata = ee->engine.data;
-
-        wdata->anim_callback = wl_surface_frame(ecore_wl_window_surface_get(wdata->win));
-        wl_callback_add_listener(wdata->anim_callback, &_anim_listener, wdata);
-     }
+   _ecore_evas_wl_common_render_updates_process(ee, ev->updated_area);
 
    if (ee->delayed.alpha_changed)
      {
diff --git a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_egl.c b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_egl.c
index 367546d693..4871283fd2 100644
--- a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_egl.c
+++ b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_egl.c
@@ -227,6 +227,9 @@ ecore_evas_wayland_egl_new_internal(const char *disp_name, unsigned int parent,
      evas_event_callback_add(ee->evas, EVAS_CALLBACK_RENDER_POST, 
                              _ecore_evas_wl_common_render_updates, ee);
 
+   evas_event_callback_add(ee->evas, EVAS_CALLBACK_RENDER_PRE,
+			     _ecore_evas_wl_common_render_pre, ee);
+
    /* FIXME: This needs to be set based on theme & scale */
    if (ee->prop.draw_frame)
      evas_output_framespace_set(ee->evas, fx, fy, fw, fh);
diff --git a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_private.h b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_private.h
index 48e9a3ff7a..7929ab32f5 100644
--- a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_private.h
+++ b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_private.h
@@ -74,6 +74,7 @@ void _ecore_evas_wl_common_post_render(Ecore_Evas *ee);
 int  _ecore_evas_wl_common_render(Ecore_Evas *ee);
 void _ecore_evas_wl_common_screen_geometry_get(const Ecore_Evas *ee, int *x, int *y, int *w, int *h);
 void _ecore_evas_wl_common_screen_dpi_get(const Ecore_Evas *ee, int *xdpi, int *ydpi);
+void _ecore_evas_wl_common_render_pre(void *data, Evas *evas EINA_UNUSED, void *event);
 void _ecore_evas_wl_common_render_updates(void *data, Evas *evas, void *event);
 void _ecore_evas_wl_common_rotation_set(Ecore_Evas *ee, int rotation, int resize);
 void _ecore_evas_wl_common_borderless_set(Ecore_Evas *ee, Eina_Bool on);
diff --git a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_shm.c b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_shm.c
index 4d3af44303..530b3ce7d1 100644
--- a/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_shm.c
+++ b/src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_shm.c
@@ -222,6 +222,9 @@ ecore_evas_wayland_shm_new_internal(const char *disp_name, unsigned int parent,
      evas_event_callback_add(ee->evas, EVAS_CALLBACK_RENDER_POST,
 			     _ecore_evas_wl_common_render_updates, ee);
 
+   evas_event_callback_add(ee->evas, EVAS_CALLBACK_RENDER_PRE,
+			     _ecore_evas_wl_common_render_pre, ee);
+
    /* FIXME: This needs to be set based on theme & scale */
    if (ee->prop.draw_frame)
      evas_output_framespace_set(ee->evas, fx, fy, fw, fh);