dix: Extract CopySprite() utility

dix/inpututils.c

@@ -1220,3 +1220,29 @@ xi2mask_get_one_mask(const XI2Mask *mask, int deviceid)
 
     return mask->masks[deviceid];
 }
+
+/**
+ * Copies a sprite data from src to dst sprites.
+ *
+ * Returns FALSE on error.
+ */
+Bool
+CopySprite(SpritePtr src, SpritePtr dst)
+{
+    WindowPtr *trace;
+    if (src->spriteTraceGood > dst->spriteTraceSize) {
+        trace = reallocarray(dst->spriteTrace,
+                             src->spriteTraceSize, sizeof(*trace));
+        if (!trace) {
+            dst->spriteTraceGood = 0;
+            return FALSE;
+        }
+        dst->spriteTrace = trace;
+        dst->spriteTraceSize = src->spriteTraceGood;
+    }
+    memcpy(dst->spriteTrace, src->spriteTrace,
+           src->spriteTraceGood * sizeof(*trace));
+    dst->spriteTraceGood = src->spriteTraceGood;
+    return TRUE;
+}
+

dix/touch.c

@@ -500,7 +500,6 @@ TouchBuildDependentSpriteTrace(DeviceIntPtr dev, SpritePtr sprite)
 {
     int i;
     TouchClassPtr t = dev->touch;
-    WindowPtr *trace;
     SpritePtr srcsprite;
 
     /* All touches should have the same sprite trace, so find and reuse an
@@ -516,21 +515,7 @@ TouchBuildDependentSpriteTrace(DeviceIntPtr dev, SpritePtr sprite)
     else
         return FALSE;
 
-    if (srcsprite->spriteTraceGood > sprite->spriteTraceSize) {
-        trace = reallocarray(sprite->spriteTrace,
-                             srcsprite->spriteTraceSize, sizeof(*trace));
-        if (!trace) {
-            sprite->spriteTraceGood = 0;
-            return FALSE;
-        }
-        sprite->spriteTrace = trace;
-        sprite->spriteTraceSize = srcsprite->spriteTraceGood;
-    }
-    memcpy(sprite->spriteTrace, srcsprite->spriteTrace,
-           srcsprite->spriteTraceGood * sizeof(*trace));
-    sprite->spriteTraceGood = srcsprite->spriteTraceGood;
-
-    return TRUE;
+    return CopySprite(srcsprite, sprite);
 }
 
 /**

include/inpututils.h

@@ -70,4 +70,7 @@ size_t xi2mask_mask_size(const XI2Mask *mask);
 void xi2mask_set_one_mask(XI2Mask *xi2mask, int deviceid,
                           const unsigned char *mask, size_t mask_size);
 const unsigned char *xi2mask_get_one_mask(const XI2Mask *xi2mask, int deviceid);
+
+Bool CopySprite(SpritePtr src, SpritePtr dst);
+
 #endif