ivi-shell: convert from screen to global coordinates

In single screen, the coordinates of layer local coordinates are the
same as global coordinates. However, to support multi screens, the
layer-local coordinates shall be transformed to multi screen coordinates,
which is global coordinates. The abosolute coordinates of a screen in global
stored in (x,y) of output of its weston output so it shall be used to
transform layer-local to global coordinates.

Signed-off-by: Nobuhiko Tanibata <nobuhiko_tanibata@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

ivi-shell/ivi-layout.c

@@ -532,6 +532,7 @@ calc_inverse_matrix_transform(const struct weston_matrix *matrix,
  */
 static void
 calc_surface_to_global_matrix_and_mask_to_weston_surface(
+	struct ivi_layout_screen  *iviscrn,
 	struct ivi_layout_layer *ivilayer,
 	struct ivi_layout_surface *ivisurf,
 	struct weston_matrix *m,
@@ -539,6 +540,7 @@ calc_surface_to_global_matrix_and_mask_to_weston_surface(
 {
 	const struct ivi_layout_surface_properties *sp = &ivisurf->prop;
 	const struct ivi_layout_layer_properties *lp = &ivilayer->prop;
+	struct weston_output *output = iviscrn->output;
 	struct ivi_rectangle weston_surface_rect = { 0,
 						     0,
 						     ivisurf->surface->width,
@@ -566,7 +568,9 @@ calc_surface_to_global_matrix_and_mask_to_weston_surface(
 	 * coordinates to global coordinates, which is computed by
 	 * two steps,
 	 * - surface-local coordinates to layer-local coordinates
-	 * - layer-local coordinates to global coordinates
+	 * - layer-local coordinates to a single screen-local coordinates
+	 * - a single screen-local coordinates to multi screen coordinates,
+         *   which is global coordinates.
 	 */
 	calc_transformation_matrix(&surface_source_rect,
 				   &surface_dest_rect,
@@ -576,6 +580,8 @@ calc_surface_to_global_matrix_and_mask_to_weston_surface(
 				   &layer_dest_rect,
 				   lp->orientation, m);
 
+	weston_matrix_translate(m, output->x, output->y, 0.0f);
+
 	/* this intersected ivi_rectangle would be used for masking
 	 * weston_surface
 	 */
@@ -622,7 +628,7 @@ update_prop(struct ivi_layout_screen  *iviscrn,
 		weston_matrix_init(&ivisurf->transform.matrix);
 
 		calc_surface_to_global_matrix_and_mask_to_weston_surface(
-			ivilayer, ivisurf, &ivisurf->transform.matrix, &r);
+			iviscrn, ivilayer, ivisurf, &ivisurf->transform.matrix, &r);
 
 		weston_view_set_mask(tmpview, r.x, r.y, r.width, r.height);
 		wl_list_insert(&tmpview->geometry.transformation_list,