From 912688326c0f9435660e86a2bdab049caa4b0e9f Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 26 Aug 2019 12:26:34 +0200
Subject: [PATCH xserver 12/14] xwayland: xwl_window_should_enable_viewport:
 Add extra test
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Games based on the allegro gaming library or on ClanLib-1.0 do not size
their window to match the fullscreen resolution, instead they use a
window covering the entire screen, drawing only the fullscreen resolution
part of it.

This commit adds a check for these games, so that we correctly apply a
viewport to them making fullscreen work properly for these games under
Xwayland.

Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 hw/xwayland/xwayland.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/hw/xwayland/xwayland.c b/hw/xwayland/xwayland.c
index ec1b7eee4..58252d2e8 100644
--- a/hw/xwayland/xwayland.c
+++ b/hw/xwayland/xwayland.c
@@ -636,6 +636,23 @@ xwl_window_should_enable_viewport(struct xwl_window *xwl_window,
         }
     }
 
+    /* 2. Test if the window uses override-redirect + vidmode
+     * and matches (fully covers) the entire screen.
+     * This path gets hit by: allegro4, ClanLib-1.0.
+     */
+    xwl_output = xwl_screen_get_first_output(xwl_screen);
+    emulated_mode = xwl_output_get_emulated_mode_for_client(xwl_output, owner);
+    if (xwl_output && xwl_window->window->overrideRedirect &&
+        emulated_mode && emulated_mode->from_vidmode &&
+        xwl_window->x == 0 && xwl_window->y == 0 &&
+        xwl_window->width  == xwl_screen->width &&
+        xwl_window->height == xwl_screen->height) {
+
+        *emulated_mode_ret = emulated_mode;
+        *xwl_output_ret = xwl_output;
+        return TRUE;
+    }
+
     return FALSE;
 }
 
-- 
2.23.0