From 52bbef1f55d17229684b0d76a478ec639c4032ed Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 7 Oct 2019 14:27:49 +0200
Subject: [PATCH xserver 21/24] xwayland: Fix emulated modes not being removed
 when screen rotation is used

The code building the mode-list does the following to deal with screen
rotation:

    if (need_rotate || xwl_output->rotation & (RR_Rotate_0 | RR_Rotate_180)) {
        mode_width = xwl_output->width;
        mode_height = xwl_output->height;
    } else {
        mode_width = xwl_output->height;
        mode_height = xwl_output->width;
    }

This means we need to do something similar in xwl_output_set_emulated_mode()
to determine if the mode being set is the actual (not-emulated) output mode
and we this should remove any emulated modes set by the client.

All callers of xwl_output_set_emulated_mode always pass a mode pointer
to a member of xwl_output->randr_output->modes, so we do not need to
duplicate this code, instead we can simply check that the passed in mode
is modes[0] which always is the actual output mode.

Acked-by: Olivier Fourdan <ofourdan@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 88342353de45e64f408c38bb10cd1506ba0f159a)
---
 hw/xwayland/xwayland-output.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/xwayland/xwayland-output.c b/hw/xwayland/xwayland-output.c
index 20c254962..7d705d919 100644
--- a/hw/xwayland/xwayland-output.c
+++ b/hw/xwayland/xwayland-output.c
@@ -309,8 +309,11 @@ xwl_output_remove_emulated_mode_for_client(struct xwl_output *xwl_output,
     struct xwl_emulated_mode *emulated_mode;
 
     emulated_mode = xwl_output_get_emulated_mode_for_client(xwl_output, client);
-    if (emulated_mode)
+    if (emulated_mode) {
+        DebugF("XWAYLAND: xwl_output_remove_emulated_mode: %dx%d\n",
+               emulated_mode->width, emulated_mode->height);
         memset(emulated_mode, 0, sizeof(*emulated_mode));
+    }
 }
 
 /* From hw/xfree86/common/xf86DefModeSet.c with some obscure modes dropped */
@@ -511,7 +514,8 @@ xwl_output_set_emulated_mode(struct xwl_output *xwl_output, ClientPtr client,
            from_vidmode ? "vidmode" : "randr",
            mode->mode.width, mode->mode.height);
 
-    if (mode->mode.width == xwl_output->width && mode->mode.height == xwl_output->height)
+    /* modes[0] is the actual (not-emulated) output mode */
+    if (mode == xwl_output->randr_output->modes[0])
         xwl_output_remove_emulated_mode_for_client(xwl_output, client);
     else
         xwl_output_add_emulated_mode_for_client(xwl_output, client, mode, from_vidmode);
-- 
2.25.2