diff --git a/libs/ui/Rect.cpp b/libs/ui/Rect.cpp
index b480f3a..dcce21f 100644
--- a/libs/ui/Rect.cpp
+++ b/libs/ui/Rect.cpp
@@ -19,6 +19,8 @@
 
 namespace android {
 
+const Rect Rect::INVALID_RECT{0, 0, -1, -1};
+
 static inline int32_t min(int32_t a, int32_t b) {
     return (a < b) ? a : b;
 }
diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index 62ec35c..3810da4 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -53,6 +53,8 @@
     direction_RTL
 };
 
+const Region Region::INVALID_REGION(Rect::INVALID_RECT);
+
 // ----------------------------------------------------------------------------
 
 Region::Region() {
@@ -517,8 +519,12 @@
     Rect b(*prev);
     while (cur != tail) {
         if (cur->isValid() == false) {
-            ALOGE_IF(!silent, "%s: region contains an invalid Rect", name);
-            result = false;
+            // We allow this particular flavor of invalid Rect, since it is used
+            // as a signal value in various parts of the system
+            if (*cur != Rect::INVALID_RECT) {
+                ALOGE_IF(!silent, "%s: region contains an invalid Rect", name);
+                result = false;
+            }
         }
         if (cur->right > region_operator<Rect>::max_value) {
             ALOGE_IF(!silent, "%s: rect->right > max_value", name);
@@ -690,7 +696,9 @@
         const Region& lhs,
         const Rect& rhs, int dx, int dy)
 {
-    if (!rhs.isValid()) {
+    // We allow this particular flavor of invalid Rect, since it is used as a
+    // signal value in various parts of the system
+    if (!rhs.isValid() && rhs != Rect::INVALID_RECT) {
         ALOGE("Region::boolean_operation(op=%d) invalid Rect={%d,%d,%d,%d}",
                 op, rhs.left, rhs.top, rhs.right, rhs.bottom);
         return;