animcur: Run the timer from the device, not the screen

This is very slightly more efficient since the callback now doesn't need
to walk every input device, instead we know exactly which device's
cursor is being updated. AnimCurTimerNotify() gets outdented nicely as a
result. A more important side effect is that we can stop using the
TimerAbsolute mode and just pass in the relative delay.

In AnimCurSetCursorPosition, we no longer need to rearm the timer with
the new screen; it is enough to update the device's state. In
AnimCurDisplayCursor we need to notice when we're switching from
animated cursor to regular and cancel the existing timer.

Reviewed-by: Robert Morell <rmorell@nvidia.com>
Tested-by: Robert Morell <rmorell@nvidia.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

render/animcur.c

@@ -55,6 +55,7 @@ typedef struct _AnimCurElt {
 typedef struct _AnimCur {
     int nelt;                   /* number of elements in the elts array */
     AnimCurElt *elts;           /* actually allocated right after the structure */
+    OsTimerPtr timer;
 } AnimCurRec, *AnimCurPtr;
 
 typedef struct _AnimScrPriv {
@@ -65,8 +66,6 @@ typedef struct _AnimScrPriv {
     RealizeCursorProcPtr RealizeCursor;
     UnrealizeCursorProcPtr UnrealizeCursor;
     RecolorCursorProcPtr RecolorCursor;
-    OsTimerPtr timer;
-    Bool timer_set;
 } AnimCurScreenRec, *AnimCurScreenPtr;
 
 static unsigned char empty[4];
@@ -130,49 +129,27 @@ AnimCurCursorLimits(DeviceIntPtr pDev,
 static CARD32
 AnimCurTimerNotify(OsTimerPtr timer, CARD32 now, void *arg)
 {
-    ScreenPtr pScreen = arg;
+    DeviceIntPtr dev = arg;
+    ScreenPtr pScreen = dev->spriteInfo->anim.pScreen;
     AnimCurScreenPtr as = GetAnimCurScreen(pScreen);
-    DeviceIntPtr dev;
-    Bool activeDevice = FALSE;
-    CARD32 soonest = ~0;       /* earliest time to wakeup again */
-
-    for (dev = inputInfo.devices; dev; dev = dev->next) {
-        if (IsPointerDevice(dev) && pScreen == dev->spriteInfo->anim.pScreen) {
-            if (!activeDevice)
-                activeDevice = TRUE;
-
-            if ((INT32) (now - dev->spriteInfo->anim.time) >= 0) {
-                AnimCurPtr ac = GetAnimCur(dev->spriteInfo->anim.pCursor);
-                int elt = (dev->spriteInfo->anim.elt + 1) % ac->nelt;
-                DisplayCursorProcPtr DisplayCursor;
-
-                /*
-                 * Not a simple Unwrap/Wrap as this
-                 * isn't called along the DisplayCursor
-                 * wrapper chain.
-                 */
-                DisplayCursor = pScreen->DisplayCursor;
-                pScreen->DisplayCursor = as->DisplayCursor;
-                (void) (*pScreen->DisplayCursor) (dev,
-                                                  pScreen,
-                                                  ac->elts[elt].pCursor);
-                as->DisplayCursor = pScreen->DisplayCursor;
-                pScreen->DisplayCursor = DisplayCursor;
-
-                dev->spriteInfo->anim.elt = elt;
-                dev->spriteInfo->anim.time = now + ac->elts[elt].delay;
-            }
 
-            if (soonest > dev->spriteInfo->anim.time)
-                soonest = dev->spriteInfo->anim.time;
-        }
-    }
+    AnimCurPtr ac = GetAnimCur(dev->spriteInfo->anim.pCursor);
+    int elt = (dev->spriteInfo->anim.elt + 1) % ac->nelt;
+    DisplayCursorProcPtr DisplayCursor = pScreen->DisplayCursor;
 
-    if (activeDevice)
-        return soonest - now;
+    /*
+     * Not a simple Unwrap/Wrap as this isn't called along the DisplayCursor
+     * wrapper chain.
+     */
+    pScreen->DisplayCursor = as->DisplayCursor;
+    (void) (*pScreen->DisplayCursor) (dev, pScreen, ac->elts[elt].pCursor);
+    as->DisplayCursor = pScreen->DisplayCursor;
+    pScreen->DisplayCursor = DisplayCursor;
 
-    as->timer_set = FALSE;
-    return 0;
+    dev->spriteInfo->anim.elt = elt;
+    dev->spriteInfo->anim.time = now + ac->elts[elt].delay;
+
+    return ac->elts[elt].delay;
 }
 
 static Bool
@@ -198,17 +175,19 @@ AnimCurDisplayCursor(DeviceIntPtr pDev, ScreenPtr pScreen, CursorPtr pCursor)
                 pDev->spriteInfo->anim.pCursor = pCursor;
                 pDev->spriteInfo->anim.pScreen = pScreen;
 
-                if (!as->timer_set) {
-                    TimerSet(as->timer, TimerAbsolute, pDev->spriteInfo->anim.time,
-                             AnimCurTimerNotify, pScreen);
-                    as->timer_set = TRUE;
-                }
+                ac->timer = TimerSet(ac->timer, 0, ac->elts[0].delay,
+                                     AnimCurTimerNotify, pDev);
             }
         }
         else
             ret = TRUE;
     }
     else {
+        CursorPtr old = pDev->spriteInfo->anim.pCursor;
+
+        if (old && IsAnimCur(old))
+            TimerCancel(GetAnimCur(old)->timer);
+
         pDev->spriteInfo->anim.pCursor = 0;
         pDev->spriteInfo->anim.pScreen = 0;
         ret = (*pScreen->DisplayCursor) (pDev, pScreen, pCursor);
@@ -227,12 +206,6 @@ AnimCurSetCursorPosition(DeviceIntPtr pDev,
     Unwrap(as, pScreen, SetCursorPosition);
     if (pDev->spriteInfo->anim.pCursor) {
         pDev->spriteInfo->anim.pScreen = pScreen;
-
-        if (!as->timer_set) {
-            TimerSet(as->timer, TimerAbsolute, pDev->spriteInfo->anim.time,
-                     AnimCurTimerNotify, pScreen);
-            as->timer_set = TRUE;
-        }
     }
     ret = (*pScreen->SetCursorPosition) (pDev, pScreen, x, y, generateEvent);
     Wrap(as, pScreen, SetCursorPosition, AnimCurSetCursorPosition);
@@ -307,11 +280,6 @@ AnimCurInit(ScreenPtr pScreen)
         return FALSE;
 
     as = GetAnimCurScreen(pScreen);
-    as->timer = TimerSet(NULL, TimerAbsolute, 0, AnimCurTimerNotify, pScreen);
-    if (!as->timer) {
-        return FALSE;
-    }
-    as->timer_set = FALSE;
 
     Wrap(as, pScreen, CloseScreen, AnimCurCloseScreen);
 
@@ -359,10 +327,14 @@ AnimCursorCreate(CursorPtr *cursors, CARD32 *deltas, int ncursor,
 
     pCursor->id = cid;
 
+    ac = GetAnimCur(pCursor);
+    ac->timer = TimerSet(NULL, 0, 0, AnimCurTimerNotify, NULL);
+
     /* security creation/labeling check */
     rc = XaceHook(XACE_RESOURCE_ACCESS, client, cid, RT_CURSOR, pCursor,
                   RT_NONE, NULL, DixCreateAccess);
     if (rc != Success) {
+        TimerFree(ac->timer);
         dixFiniPrivates(pCursor, PRIVATE_CURSOR);
         free(pCursor);
         return rc;
@@ -372,7 +344,6 @@ AnimCursorCreate(CursorPtr *cursors, CARD32 *deltas, int ncursor,
      * Fill in the AnimCurRec
      */
     animCursorBits.refcnt++;
-    ac = GetAnimCur(pCursor);
     ac->nelt = ncursor;
     ac->elts = (AnimCurElt *) (ac + 1);