Currently the xwayland implementation of desktop surfaces doesn't do
anything when weston_desktop_surface_set_maximized/fullscreen() is called.
In order to support this, we have to add xwayland internal interfaces
for sending those requests to the xwayland window. Also, a xwayland desktop
surface states need to be handled better - the current way of assigning a
single state to each surface doesn't work - for example, if a view was
maximized, then fullscreen and then unfullscreened, we would lose the
maximized state. That's why this code handles states as bit masks of the
states.

Signed-off-by: Ilia Bozhinov <[email protected]>
---
 libweston-desktop/xwayland.c           | 74 +++++++++++++++++++++++-----------
 xwayland/window-manager.c              | 24 +++++++++++
 xwayland/xwayland-internal-interface.h |  2 +
 3 files changed, 77 insertions(+), 23 deletions(-)

diff --git a/libweston-desktop/xwayland.c b/libweston-desktop/xwayland.c
index 4f4b453f..8a105537 100644
--- a/libweston-desktop/xwayland.c
+++ b/libweston-desktop/xwayland.c
@@ -38,12 +38,12 @@
 #include "xwayland/xwayland-internal-interface.h"
 
 enum weston_desktop_xwayland_surface_state {
-       NONE,
-       TOPLEVEL,
-       MAXIMIZED,
-       FULLSCREEN,
-       TRANSIENT,
-       XWAYLAND,
+       NONE = 0,
+       TOPLEVEL = 1 << 0,
+       MAXIMIZED = 1 << 1,
+       FULLSCREEN = 1 << 2,
+       TRANSIENT = 1 << 3,
+       XWAYLAND = 1 << 4,
 };
 
 struct weston_desktop_xwayland {
@@ -178,7 +178,7 @@ weston_desktop_xwayland_surface_destroy(struct 
weston_desktop_surface *dsurface,
        if (surface->added)
                weston_desktop_api_surface_removed(surface->desktop,
                                                   surface->surface);
-       else if (surface->state == XWAYLAND)
+       else if (surface->state & XWAYLAND)
                weston_desktop_surface_unlink_view(surface->view);
 
        free(surface);
@@ -190,7 +190,25 @@ weston_desktop_xwayland_surface_get_maximized(struct 
weston_desktop_surface *dsu
 {
        struct weston_desktop_xwayland_surface *surface = user_data;
 
-       return surface->state == MAXIMIZED;
+       return surface->state & MAXIMIZED;
+}
+
+static void
+weston_desktop_xwayland_surface_set_maximized(struct weston_desktop_surface 
*dsurface,
+               void *user_data, bool maximized)
+{
+       struct weston_desktop_xwayland_surface *surface = user_data;
+       struct weston_surface *wsurface =
+               weston_desktop_surface_get_surface(surface->surface);
+
+       if (surface->state & FULLSCREEN)
+               return;
+
+       surface->client_interface->send_maximized(wsurface, maximized);
+       if (maximized)
+               surface->state |= MAXIMIZED;
+       else
+               surface->state &= ~MAXIMIZED;
 }
 
 static bool
@@ -199,7 +217,22 @@ weston_desktop_xwayland_surface_get_fullscreen(struct 
weston_desktop_surface *ds
 {
        struct weston_desktop_xwayland_surface *surface = user_data;
 
-       return surface->state == FULLSCREEN;
+       return surface->state & FULLSCREEN;
+}
+
+static void
+weston_desktop_xwayland_surface_set_fullscreen(struct weston_desktop_surface 
*dsurface,
+               void *user_data, bool fullscreen)
+{
+       struct weston_desktop_xwayland_surface *surface = user_data;
+       struct weston_surface *wsurface =
+               weston_desktop_surface_get_surface(surface->surface);
+
+       surface->client_interface->send_maximized(wsurface, fullscreen);
+       if (fullscreen)
+               surface->state |= FULLSCREEN;
+       else
+               surface->state &= ~FULLSCREEN;
 }
 
 static const struct weston_desktop_surface_implementation 
weston_desktop_xwayland_surface_internal_implementation = {
@@ -207,7 +240,9 @@ static const struct weston_desktop_surface_implementation 
weston_desktop_xwaylan
        .set_size = weston_desktop_xwayland_surface_set_size,
 
        .get_maximized = weston_desktop_xwayland_surface_get_maximized,
+       .set_maximized = weston_desktop_xwayland_surface_set_maximized,
        .get_fullscreen = weston_desktop_xwayland_surface_get_fullscreen,
+       .set_fullscreen = weston_desktop_xwayland_surface_set_fullscreen,
 
        .destroy = weston_desktop_xwayland_surface_destroy,
 };
@@ -260,16 +295,15 @@ create_surface(struct weston_desktop_xwayland *xwayland,
 static void
 set_toplevel(struct weston_desktop_xwayland_surface *surface)
 {
-       weston_desktop_xwayland_surface_change_state(surface, TOPLEVEL, NULL,
-                                                    0, 0);
+       surface->state |= TOPLEVEL;
+       surface->state &= ~(MAXIMIZED | FULLSCREEN);
 }
 
 static void
 set_toplevel_with_position(struct weston_desktop_xwayland_surface *surface,
                           int32_t x, int32_t y)
 {
-       weston_desktop_xwayland_surface_change_state(surface, TOPLEVEL, NULL,
-                                                    0, 0);
+       set_toplevel(surface);
        weston_desktop_api_set_xwayland_position(surface->desktop,
                                                 surface->surface, x, y);
 }
@@ -305,8 +339,7 @@ static void
 set_fullscreen(struct weston_desktop_xwayland_surface *surface,
               struct weston_output *output)
 {
-       weston_desktop_xwayland_surface_change_state(surface, FULLSCREEN, NULL,
-                                                    0, 0);
+       surface->state |= FULLSCREEN;
        weston_desktop_api_fullscreen_requested(surface->desktop,
                                                surface->surface, true, output);
 }
@@ -322,9 +355,7 @@ static int
 move(struct weston_desktop_xwayland_surface *surface,
      struct weston_pointer *pointer)
 {
-       if (surface->state == TOPLEVEL ||
-           surface->state == MAXIMIZED ||
-           surface->state == FULLSCREEN)
+       if (surface->state & (TOPLEVEL | MAXIMIZED | FULLSCREEN))
                weston_desktop_api_move(surface->desktop, surface->surface,
                                        pointer->seat, pointer->grab_serial);
        return 0;
@@ -334,9 +365,7 @@ static int
 resize(struct weston_desktop_xwayland_surface *surface,
        struct weston_pointer *pointer, uint32_t edges)
 {
-       if (surface->state == TOPLEVEL ||
-           surface->state == MAXIMIZED ||
-           surface->state == FULLSCREEN)
+       if (surface->state & (TOPLEVEL | MAXIMIZED | FULLSCREEN))
                weston_desktop_api_resize(surface->desktop, surface->surface,
                                          pointer->seat, pointer->grab_serial,
                                          edges);
@@ -363,8 +392,7 @@ set_window_geometry(struct weston_desktop_xwayland_surface 
*surface,
 static void
 set_maximized(struct weston_desktop_xwayland_surface *surface)
 {
-       weston_desktop_xwayland_surface_change_state(surface, MAXIMIZED, NULL,
-                                                    0, 0);
+       surface->state |= MAXIMIZED;
        weston_desktop_api_maximized_requested(surface->desktop,
                                               surface->surface, true);
 }
diff --git a/xwayland/window-manager.c b/xwayland/window-manager.c
index 13acc84e..ef07a7cd 100644
--- a/xwayland/window-manager.c
+++ b/xwayland/window-manager.c
@@ -2617,8 +2617,32 @@ send_position(struct weston_surface *surface, int32_t x, 
int32_t y)
        }
 }
 
+static void send_maximized(struct weston_surface *surface, bool maximized)
+{
+       struct weston_wm_window *window = get_wm_window(surface);
+
+       if (window->maximized_horz == maximized &&
+           window->maximized_vert == maximized)
+               return;
+
+       window->maximized_horz = window->maximized_vert = maximized;
+       weston_wm_window_set_net_wm_state(window);
+}
+
+static void send_fullscreen(struct weston_surface *surface, bool fullscreen)
+{
+       struct weston_wm_window *window = get_wm_window(surface);
+       if (window->fullscreen == fullscreen)
+               return;
+
+       window->fullscreen = fullscreen;
+       weston_wm_window_set_net_wm_state(window);
+}
+
 static const struct weston_xwayland_client_interface shell_client = {
        send_configure,
+       send_maximized,
+       send_fullscreen
 };
 
 static int
diff --git a/xwayland/xwayland-internal-interface.h 
b/xwayland/xwayland-internal-interface.h
index 10964440..48716b14 100644
--- a/xwayland/xwayland-internal-interface.h
+++ b/xwayland/xwayland-internal-interface.h
@@ -31,6 +31,8 @@ struct weston_desktop_xwayland_surface;
 
 struct weston_xwayland_client_interface {
        void (*send_configure)(struct weston_surface *surface, int32_t width, 
int32_t height);
+       void (*send_maximized)(struct weston_surface *surface, bool maximized);
+       void (*send_fullscreen)(struct weston_surface *surface, bool 
fullscreen);
 };
 
 struct weston_desktop_xwayland_interface {
-- 
2.13.0

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