From cfafcd2528f3eabf881ed2c7bbdcd59d5847de13 Mon Sep 17 00:00:00 2001
From: Jay Sorg <jay.sorg@gmail.com>
Date: Sun, 7 Mar 2021 00:49:09 -0800
Subject: [PATCH] use damage to track any lost screen changes

---
 module/rdp.h      |  1 +
 xrdpdev/xrdpdev.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/module/rdp.h b/module/rdp.h
index 04ce1913..125c7d90 100644
--- a/module/rdp.h
+++ b/module/rdp.h
@@ -325,6 +325,7 @@ struct _rdpRec
     int fd;
     /* egl */
     void *egl;
+    DamagePtr damage;
 };
 typedef struct _rdpRec rdpRec;
 typedef struct _rdpRec * rdpPtr;
diff --git a/xrdpdev/xrdpdev.c b/xrdpdev/xrdpdev.c
index 2dcce60d..e3121f10 100644
--- a/xrdpdev/xrdpdev.c
+++ b/xrdpdev/xrdpdev.c
@@ -87,7 +87,8 @@ Bool g_use_dri3 = TRUE;
   while (0)
 
 static int g_setup_done = 0;
-static OsTimerPtr g_timer = 0;
+static OsTimerPtr g_randr_timer = 0;
+static OsTimerPtr g_damage_timer = 0;
 
 static char g_xrdp_driver_name[] = XRDP_DRIVER_NAME;
 
@@ -367,6 +368,47 @@ rdpResizeSession(rdpPtr dev, int width, int height)
     return ok;
 }
 
+/*****************************************************************************/
+static void
+xorgxrdpDamageReport(DamagePtr pDamage, RegionPtr pRegion, void *closure)
+{
+    rdpPtr dev;
+    ScreenPtr pScreen;
+
+    LLOGLN(10, ("xorgxrdpDamageReport:"));
+    pScreen = (ScreenPtr)closure;
+    dev = rdpGetDevFromScreen(pScreen);
+    rdpClientConAddAllReg(dev, pRegion, &(pScreen->root->drawable));
+}
+
+/*****************************************************************************/
+static void
+xorgxrdpDamageDestroy(DamagePtr pDamage, void *closure)
+{
+    LLOGLN(0, ("xorgxrdpDamageDestroy:"));
+}
+
+/******************************************************************************/
+/* returns error */
+static CARD32
+rdpDeferredDamage(OsTimerPtr timer, CARD32 now, pointer arg)
+{
+    ScreenPtr pScreen;
+    rdpPtr dev;
+
+    pScreen = (ScreenPtr) arg;
+    dev = rdpGetDevFromScreen(pScreen);
+    dev->damage = DamageCreate(xorgxrdpDamageReport, xorgxrdpDamageDestroy,
+                               DamageReportRawRegion, TRUE,
+                               pScreen, pScreen);
+    if (dev->damage != NULL)
+    {
+        DamageSetReportAfterOp(dev->damage, TRUE);
+        DamageRegister(&(pScreen->root->drawable), dev->damage);
+    }
+    return 0;
+}
+
 /******************************************************************************/
 /* returns error */
 static CARD32
@@ -723,7 +765,8 @@ rdpScreenInit(ScreenPtr pScreen, int argc, char **argv)
 
     RegisterBlockAndWakeupHandlers(rdpBlockHandler1, rdpWakeupHandler1, pScreen);
 
-    g_timer = TimerSet(g_timer, 0, 10, rdpDeferredRandR, pScreen);
+    g_randr_timer = TimerSet(g_randr_timer, 0, 10, rdpDeferredRandR, pScreen);
+    g_damage_timer = TimerSet(g_damage_timer, 0, 10, rdpDeferredDamage, pScreen);
 
     if (rdpClientConInit(dev) != 0)
     {