intel-virtual-output: Do not resize the screen whilst all outputs are off

If all the outputs are off, we try to resize the screen to 1x1, which is
typically illegal. So, just keep the existing screen and xfer buffer for
next time it is enabled.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 25 insertions, 7 deletions

diff --git a/tools/virtual.c b/tools/virtual.c
index b891fd00..cba247bf 100644
--- a/tools/virtual.c
+++ b/tools/virtual.c
@@ -1073,17 +1073,34 @@ static int context_update(struct context *ctx)
 				y2 = v;
 		}
 
-		x2 -= x1;
-		y2 -= y1;
 		DBG(("%s fb bounds (%d, %d)x(%d, %d)\n", DisplayString(display->dpy),
 		     x1, y1, x2, y2));
 
+		XGrabServer(display->dpy);
 		res = _XRRGetScreenResourcesCurrent(display->dpy, display->root);
 		if (res == NULL)
-			continue;
+			goto ungrab;
 
-		XGrabServer(display->dpy);
+		if (x2 <= x1 || y2 <= y1) {
+			/* Nothing enabled, preserve the current fb, and turn everything off */
+			for (clone = display->clone; clone; clone = clone->next) {
+				struct output *dst = &clone->dst;
 
+				if (!dst->rr_crtc)
+					continue;
+
+				DBG(("%s: disabling output '%s'\n",
+				     DisplayString(dst->dpy), dst->name));
+				XRRSetCrtcConfig(dst->dpy, res, dst->rr_crtc, CurrentTime,
+						0, 0, None, RR_Rotate_0, NULL, 0);
+				dst->rr_crtc = 0;
+				dst->mode.id = 0;
+			}
+			goto free_res;
+		}
+
+		x2 -= x1;
+		y2 -= y1;
 		DBG(("%s: current size %dx%d, need %dx%d\n",
 		     DisplayString(display->dpy),
 		     display->width, display->height,
@@ -1100,7 +1117,7 @@ static int context_update(struct context *ctx)
 				DBG(("%s: disabling output '%s'\n",
 				     DisplayString(dst->dpy), dst->name));
 				XRRSetCrtcConfig(dst->dpy, res, dst->rr_crtc, CurrentTime,
-						0, 0, None, RR_Rotate_0, NULL, 0);
+						 0, 0, None, RR_Rotate_0, NULL, 0);
 				dst->rr_crtc = 0;
 				dst->mode.id = 0;
 			}
@@ -1230,9 +1247,10 @@ err:
 			dst->rr_crtc = rr_crtc;
 			(void)ret;
 		}
-		XUngrabServer(display->dpy);
-
+free_res:
 		XRRFreeScreenResources(res);
+ungrab:
+		XUngrabServer(display->dpy);
 	}
 
 	ctx->active = NULL;