From: Rob Bradford <r...@linux.intel.com>

---
 src/shell.c |   68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 67 insertions(+), 1 deletions(-)

diff --git a/src/shell.c b/src/shell.c
index a28302b..c6108c3 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -631,6 +631,71 @@ shell_surface_set_popup(struct wl_client *client,
        shsurf->popup.y = y;
 }
 
+
+static void
+shell_surface_probe_area(struct wl_client *client,
+                        struct wl_resource *resource,
+                        int x,
+                        int y,
+                        int w,
+                        int h)
+{
+       struct shell_surface *shsurf = resource->data;
+       struct {
+               struct {
+                       int x;
+                       int y;
+               } tl, br;
+       } orig, new;
+
+       int output_w, output_h;
+
+       int new_x, new_y, new_w, new_h;
+
+       output_w = shsurf->surface->output->current->width;
+       output_h = shsurf->surface->output->current->height;
+
+       /* orig and new are in global co-ordinates */
+       orig.tl.x = shsurf->surface->geometry.x + x;
+       orig.tl.y = shsurf->surface->geometry.y + y;
+       orig.br.x = orig.tl.x + w;
+       orig.br.y = orig.tl.y + h;
+
+       new = orig;
+
+       /* Clamp the top left so it is inside */
+       if (orig.tl.x < 0)
+         new.tl.x = 0;
+       if (orig.tl.y < 0)
+         new.tl.y = 0;
+       if (orig.tl.x > output_w)
+         new.tl.x = output_w;
+       if (orig.tl.y > output_h)
+         new.tl.y = output_h;
+
+       /* Clamp the bottom right so it is inside */
+       if (orig.br.x < 0)
+         new.br.x = 0;
+       if (orig.br.y < 0)
+         new.br.y = 0;
+       if (orig.br.x > output_w)
+         new.br.x = output_w;
+       if (orig.br.y > output_h)
+         new.br.y = output_h;
+
+       /* Translate back into relative co-ordinates */
+       new_x = new.tl.x - shsurf->surface->geometry.x;
+       new_y = new.tl.y - shsurf->surface->geometry.y;
+       new_w = new.br.x - new.tl.x;
+       new_h = new.br.y - new.tl.y;
+
+       wl_resource_post_event(resource,
+                              WL_SHELL_SURFACE_VISIBLE_AREA,
+                              new_x, new_y,
+                              new_w, new_h);
+
+}
+
 static const struct wl_shell_surface_interface shell_surface_implementation = {
        shell_surface_move,
        shell_surface_resize,
@@ -638,7 +703,8 @@ static const struct wl_shell_surface_interface 
shell_surface_implementation = {
        shell_surface_set_transient,
        shell_surface_set_fullscreen,
        shell_surface_set_popup,
-       shell_surface_set_maximized
+       shell_surface_set_maximized,
+       shell_surface_probe_area,
 };
 
 static void
-- 
1.7.7.6

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