From 8af989546907ad9fb491d940e1936d3bfc89276b Mon Sep 17 00:00:00 2001
From: Michel Dänzer <michel.daenzer@amd.com>
Date: Thu, 8 Mar 2018 18:48:28 +0100
Subject: Pass extents to amdgpu_scanout_do_update by value

amdgpu_scanout_extents_intersect could leave the scanout damage region
in an invalid state, triggering debugging checks in pixman:

*** BUG ***
In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Set a breakpoint on '_pixman_log_error' to debug
---
 src/amdgpu_drv.h      |  2 +-
 src/amdgpu_kms.c      | 24 ++++++++++++------------
 src/drmmode_display.c |  4 ++--
 3 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/src/amdgpu_drv.h b/src/amdgpu_drv.h
index acf6977..8a77b05 100644
--- a/src/amdgpu_drv.h
+++ b/src/amdgpu_drv.h
@@ -347,7 +347,7 @@ Bool amdgpu_dri3_screen_init(ScreenPtr screen);
 
 /* amdgpu_kms.c */
 Bool amdgpu_scanout_do_update(xf86CrtcPtr xf86_crtc, int scanout_id,
-			      PixmapPtr src_pix, BoxPtr extents);
+			      PixmapPtr src_pix, BoxRec extents);
 void AMDGPUWindowExposures_oneshot(WindowPtr pWin, RegionPtr pRegion
 #if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,16,99,901,0)
 				   , RegionPtr pBSRegion
diff --git a/src/amdgpu_kms.c b/src/amdgpu_kms.c
index b287fcc..7ec610f 100644
--- a/src/amdgpu_kms.c
+++ b/src/amdgpu_kms.c
@@ -804,21 +804,21 @@ amdgpu_dirty_update(ScrnInfoPtr scrn)
 
 Bool
 amdgpu_scanout_do_update(xf86CrtcPtr xf86_crtc, int scanout_id,
-			 PixmapPtr src_pix, BoxPtr extents)
+			 PixmapPtr src_pix, BoxRec extents)
 {
 	drmmode_crtc_private_ptr drmmode_crtc = xf86_crtc->driver_private;
-	RegionRec region = { .extents = *extents, .data = NULL };
+	RegionRec region = { .extents = extents, .data = NULL };
 	ScrnInfoPtr scrn = xf86_crtc->scrn;
 	ScreenPtr pScreen = scrn->pScreen;
 	DrawablePtr pDraw;
 
 	if (!xf86_crtc->enabled ||
 	    !drmmode_crtc->scanout[scanout_id].pixmap ||
-	    extents->x1 >= extents->x2 || extents->y1 >= extents->y2)
+	    extents.x1 >= extents.x2 || extents.y1 >= extents.y2)
 		return FALSE;
 
 	pDraw = &drmmode_crtc->scanout[scanout_id].pixmap->drawable;
-	if (!amdgpu_scanout_extents_intersect(xf86_crtc, extents))
+	if (!amdgpu_scanout_extents_intersect(xf86_crtc, &extents))
 		return FALSE;
 
 	if (drmmode_crtc->tear_free) {
@@ -860,9 +860,9 @@ amdgpu_scanout_do_update(xf86CrtcPtr xf86_crtc, int scanout_id,
 		pScreen->SourceValidate = NULL;
 		CompositePicture(PictOpSrc,
 				 src, NULL, dst,
-				 extents->x1, extents->y1, 0, 0, extents->x1,
-				 extents->y1, extents->x2 - extents->x1,
-				 extents->y2 - extents->y1);
+				 extents.x1, extents.y1, 0, 0, extents.x1,
+				 extents.y1, extents.x2 - extents.x1,
+				 extents.y2 - extents.y1);
 		pScreen->SourceValidate = SourceValidate;
 
  free_dst:
@@ -876,9 +876,9 @@ amdgpu_scanout_do_update(xf86CrtcPtr xf86_crtc, int scanout_id,
 
 		ValidateGC(pDraw, gc);
 		(*gc->ops->CopyArea)(&src_pix->drawable, pDraw, gc,
-				     xf86_crtc->x + extents->x1, xf86_crtc->y + extents->y1,
-				     extents->x2 - extents->x1, extents->y2 - extents->y1,
-				     extents->x1, extents->y1);
+				     xf86_crtc->x + extents.x1, xf86_crtc->y + extents.y1,
+				     extents.x2 - extents.x1, extents.y2 - extents.y1,
+				     extents.x1, extents.y1);
 		FreeScratchGC(gc);
 	}
 
@@ -908,7 +908,7 @@ amdgpu_scanout_update_handler(xf86CrtcPtr crtc, uint32_t frame, uint64_t usec,
 	    drmmode_crtc->dpms_mode == DPMSModeOn) {
 		if (amdgpu_scanout_do_update(crtc, drmmode_crtc->scanout_id,
 					     screen->GetWindowPixmap(screen->root),
-					     &region->extents))
+					     region->extents))
 			RegionEmpty(region);
 	}
 
@@ -989,7 +989,7 @@ amdgpu_scanout_flip(ScreenPtr pScreen, AMDGPUInfoPtr info,
 	scanout_id = drmmode_crtc->scanout_id ^ 1;
 	if (!amdgpu_scanout_do_update(xf86_crtc, scanout_id,
 				      pScreen->GetWindowPixmap(pScreen->root),
-				      &region->extents))
+				      region->extents))
 		return;
 	RegionEmpty(region);
 
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 3513c1f..85970d1 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -754,7 +754,7 @@ drmmode_crtc_scanout_update(xf86CrtcPtr crtc, DisplayModePtr mode,
 
 		amdgpu_scanout_do_update(crtc, scanout_id,
 					 screen->GetWindowPixmap(screen->root),
-					 box);
+					 *box);
 		amdgpu_glamor_finish(scrn);
 	}
 }
@@ -3079,7 +3079,7 @@ Bool amdgpu_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
 			}
 
 			amdgpu_scanout_do_update(crtc, scanout_id, new_front,
-						 &extents);
+						 extents);
 
 			drmmode_crtc_wait_pending_event(drmmode_crtc, pAMDGPUEnt->fd,
 							drmmode_crtc->scanout_update_pending);
-- 
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