From d837f7003d22c5e0d5bd05d41e872e7ee331dfa4 Mon Sep 17 00:00:00 2001
From: Robert Mader <robert.mader@posteo.de>
Date: Mon, 22 Jan 2018 17:57:38 +0100
Subject: [PATCH xserver 05/24] xwayland: Use RandR 1.2 interface (rev 2)
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This adds the RandR 1.2 interface to xwayland and allows modes
advertised by the compositor to be set in an undistructive manner.

With this patch, applications that try to set the resolution will usually
succeed and work while other apps using the same xwayland
instance are not affected at all.

The RandR 1.2 interface will be needed to implement fake-mode-setting and
already makes applications work much cleaner and predictive when a mode
was set.

[hdegoede@redhat.com: Make crtc_set only succeed if the mode matches
 the desktop resolution]

Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit e89872f51aa834fa9d94a4ca4822f03b0341ab4f)
---
 hw/xwayland/xwayland-output.c | 81 +++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/hw/xwayland/xwayland-output.c b/hw/xwayland/xwayland-output.c
index 2ccc3ca60..67e99bdab 100644
--- a/hw/xwayland/xwayland-output.c
+++ b/hw/xwayland/xwayland-output.c
@@ -561,12 +561,80 @@ xwl_randr_get_info(ScreenPtr pScreen, Rotation * rotations)
     return TRUE;
 }
 
+#ifdef RANDR_10_INTERFACE
 static Bool
 xwl_randr_set_config(ScreenPtr pScreen,
                      Rotation rotation, int rate, RRScreenSizePtr pSize)
 {
     return FALSE;
 }
+#endif
+
+#if RANDR_12_INTERFACE
+static Bool
+xwl_randr_screen_set_size(ScreenPtr pScreen,
+                          CARD16 width,
+                          CARD16 height,
+                          CARD32 mmWidth, CARD32 mmHeight)
+{
+    return TRUE;
+}
+
+static Bool
+xwl_randr_crtc_set(ScreenPtr pScreen,
+                   RRCrtcPtr crtc,
+                   RRModePtr mode,
+                   int x,
+                   int y,
+                   Rotation rotation,
+                   int numOutputs, RROutputPtr * outputs)
+{
+    struct xwl_output *xwl_output = crtc->devPrivate;
+
+    if (!mode || (mode->mode.width  == xwl_output->width &&
+                  mode->mode.height == xwl_output->height)) {
+        RRCrtcChanged(crtc, TRUE);
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static Bool
+xwl_randr_crtc_set_gamma(ScreenPtr pScreen, RRCrtcPtr crtc)
+{
+    return TRUE;
+}
+
+static Bool
+xwl_randr_crtc_get_gamma(ScreenPtr pScreen, RRCrtcPtr crtc)
+{
+    return TRUE;
+}
+
+static Bool
+xwl_randr_output_set_property(ScreenPtr pScreen,
+                              RROutputPtr output,
+                              Atom property,
+                              RRPropertyValuePtr value)
+{
+    return TRUE;
+}
+
+static Bool
+xwl_output_validate_mode(ScreenPtr pScreen,
+                         RROutputPtr output,
+                         RRModePtr mode)
+{
+    return TRUE;
+}
+
+static void
+xwl_randr_mode_destroy(ScreenPtr pScreen, RRModePtr mode)
+{
+    return;
+}
+#endif
 
 Bool
 xwl_screen_init_output(struct xwl_screen *xwl_screen)
@@ -580,7 +648,20 @@ xwl_screen_init_output(struct xwl_screen *xwl_screen)
 
     rp = rrGetScrPriv(xwl_screen->screen);
     rp->rrGetInfo = xwl_randr_get_info;
+
+#if RANDR_10_INTERFACE
     rp->rrSetConfig = xwl_randr_set_config;
+#endif
+
+#if RANDR_12_INTERFACE
+    rp->rrScreenSetSize = xwl_randr_screen_set_size;
+    rp->rrCrtcSet = xwl_randr_crtc_set;
+    rp->rrCrtcSetGamma = xwl_randr_crtc_set_gamma;
+    rp->rrCrtcGetGamma = xwl_randr_crtc_get_gamma;
+    rp->rrOutputSetProperty = xwl_randr_output_set_property;
+    rp->rrOutputValidateMode = xwl_output_validate_mode;
+    rp->rrModeDestroy = xwl_randr_mode_destroy;
+#endif
 
     return TRUE;
 }
-- 
2.25.2