[PATCH 2/2] Set DamageSetReportAfterOp to true for the damage extension

[Eric Anholt]

From: Kristian Høgsberg <krh at bitplanet.net>

Change the damage extension reporter to queue up events after we chain
to the wrapped functions.  Damage events are typically sent out after
the rendering happens anyway, since we submit batch buffers from the
flush callback chain and then flush client io buffers.  Compositing
managers relie on this order, and there is no way we could reliably
provide damage events to clients before the rendering happens anyway.

By queueing up the damage events before the rendering happens, there's
a risk that the client io buffer may overflow and send the damage
events to the client before the driver has even seen the rendering
request.  Reporting damage events after the rendering fixes this
corner case and better corresponds with how we expect this to work.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
Reviewed-by: Keith Packard <keithp at keithp.com>
(cherry picked from commit 8d7b7a0d71e0b89321b3341b781bc8845386def6)
[anholt: re-applied to revert the revert, now that the cause of the
revert is fixed]
---
 damageext/damageext.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/damageext/damageext.c b/damageext/damageext.c
index 4aa0ff3..754383d 100644
--- a/damageext/damageext.c
+++ b/damageext/damageext.c
@@ -217,6 +217,7 @@ ProcDamageCreate (ClientPtr client)
     if (!AddResource (stuff->damage, DamageExtType, (pointer) pDamageExt))
 	return BadAlloc;
 
+    DamageSetReportAfterOp (pDamageExt->pDamage, TRUE);
     DamageRegister (pDamageExt->pDrawable, pDamageExt->pDamage);
 
     if (pDrawable->type == DRAWABLE_WINDOW)
-- 
1.7.2.3