layout: Resize the active surface when doing the split

This adds an intermediate geometry variable which is used to save and
restore to the original available geometry when destroying the split
surface. This takes care to inform the client that a new resize is
needed when the split surface is destroyed or when the split surface
is committed.

The width and height of the split surface is derived from the available
geometry area size (the available size of the background surface) but
this can further adapted to be based on the split window size (that is,
it could be specified by the client). This assumption is there to
simplify the implementation.

Bug-AGL: SPEC-3334

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ia484a922a7cbd314db2c878f81cb548458d1c1cd

3 files changed, 71 insertions, 6 deletions

diff --git a/src/desktop.c b/src/desktop.c
index d166626..7502d6c 100644
--- a/src/desktop.c
+++ b/src/desktop.c
@@ -126,6 +126,16 @@ desktop_surface_removed(struct weston_desktop_surface *dsurface, void *userdata)
 	else
 		return;
 
+	/* resize the active surface to the original size */
+	if (surface->role == IVI_SURFACE_ROLE_SPLIT_H ||
+	    surface->role == IVI_SURFACE_ROLE_SPLIT_V) {
+		if (output && output->active) {
+			ivi_layout_desktop_resize(output->active, output->area_saved);
+		}
+		/* restore the area back so we can re-use it again if needed */
+		output->area = output->area_saved;
+	}
+
 	/* reset the active surface as well */
 	if (output && output->active && output->active == surface) {
 		output->active->view->is_mapped = false;
diff --git a/src/ivi-compositor.h b/src/ivi-compositor.h
index c733ff0..99ef550 100644
--- a/src/ivi-compositor.h
+++ b/src/ivi-compositor.h
@@ -130,6 +130,7 @@ struct ivi_output {
 	 * In output-coorrdinate space.
 	 */
 	struct weston_geometry area;
+	struct weston_geometry area_saved;
 
 	struct ivi_surface *active;
 	struct ivi_surface *previous_active;
@@ -329,4 +330,8 @@ ivi_layout_split_committed(struct ivi_surface *surface);
 void
 ivi_layout_deactivate(struct ivi_compositor *ivi, const char *app_id);
 
+void
+ivi_layout_desktop_resize(struct ivi_surface *surface,
+			  struct weston_geometry area);
+
 #endif
diff --git a/src/layout.c b/src/layout.c
index f5beb9f..bcaf897 100644
--- a/src/layout.c
+++ b/src/layout.c
@@ -322,6 +322,26 @@ ivi_layout_fullscreen_committed(struct ivi_surface *surface)
 }
 
 void
+ivi_layout_desktop_resize(struct ivi_surface *surface,
+			  struct weston_geometry area)
+{
+	struct weston_desktop_surface *dsurf = surface->dsurface;
+	struct weston_view *view = surface->view;
+
+	int x = area.x;
+	int y = area.y;
+	int width = area.width;
+	int height = area.height;
+
+	weston_desktop_surface_set_size(dsurf,
+					width, height);
+
+	weston_view_set_position(view, x, y);
+	weston_view_update_transform(view);
+	weston_view_damage_below(view);
+}
+
+void
 ivi_layout_split_committed(struct ivi_surface *surface)
 {
 	struct ivi_compositor *ivi = surface->ivi;
@@ -335,8 +355,9 @@ ivi_layout_split_committed(struct ivi_surface *surface)
 
 	struct weston_view *view = surface->view;
 	struct weston_geometry geom;
-	int x;
-	int y;
+
+	int x, y;
+	int width, height;
 
 	x = woutput->x;
 	y = woutput->y;
@@ -345,27 +366,56 @@ ivi_layout_split_committed(struct ivi_surface *surface)
 		return;
 
 	geom = weston_desktop_surface_get_geometry(dsurface);
-	weston_log("(split) geom x %d, y %d, width %d, height %d\n", geom.x, geom.y,
-			geom.width, geom.height);
 
 	assert(surface->role == IVI_SURFACE_ROLE_SPLIT_H ||
 	       surface->role == IVI_SURFACE_ROLE_SPLIT_V);
 
-	weston_view_set_output(view, woutput);
+	/* save the previous area in order to recover it back when if this kind
+	 * of surface is being destroyed/removed */
+	output->area_saved = output->area;
 
 	switch (surface->role) {
 	case IVI_SURFACE_ROLE_SPLIT_V:
+		if (geom.width == woutput->width &&
+		    geom.height == woutput->height)
+			geom.width = (output->area.width / 2);
+
 		x += woutput->width - geom.width;
 		output->area.width -= geom.width;
+
+		width = woutput->width - x;
+		height = output->area.height;
+		y = output->area.y;
+
 		break;
 	case IVI_SURFACE_ROLE_SPLIT_H:
+		if (geom.width == woutput->width &&
+		    geom.height == woutput->height)
+			geom.height = (output->area.height / 2);
+
+		y = output->area.y;
 		output->area.y += geom.height;
 		output->area.height -= geom.height;
+
+		width = output->area.width;
+		height = output->area.height;
+
+		x = output->area.x;
+
 		break;
 	default:
-		abort();
+		assert(!"Invalid split orientation\n");
 	}
 
+	weston_desktop_surface_set_size(dsurface,
+					width, height);
+
+	/* resize the active surface first, output->area already contains
+	 * correct area to resize to */
+	if (output->active)
+		ivi_layout_desktop_resize(output->active, output->area);
+
+	weston_view_set_output(view, woutput);
 	weston_view_set_position(view, x, y);
 	weston_layer_entry_insert(&ivi->normal.view_list, &view->layer_link);