diff --git a/libs/gui/ISensorServer.cpp b/libs/gui/ISensorServer.cpp
index 7111092..0b76f37 100644
--- a/libs/gui/ISensorServer.cpp
+++ b/libs/gui/ISensorServer.cpp
@@ -55,7 +55,7 @@
         int32_t n = reply.readInt32();
         v.setCapacity(n);
         while (n--) {
-            reply.read(static_cast<Flattenable&>(s));
+            reply.read(s);
             v.add(s);
         }
         return v;
@@ -84,7 +84,7 @@
             size_t n = v.size();
             reply->writeInt32(n);
             for (size_t i=0 ; i<n ; i++) {
-                reply->write(static_cast<const Flattenable&>(v[i]));
+                reply->write(v[i]);
             }
             return NO_ERROR;
         } break;
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 07f62c4..e2604f8 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -26,14 +26,7 @@
 {
     status_t err;
 
-    size_t len = transparentRegion.write(NULL, 0);
-    err = output.writeInt32(len);
-    if (err < NO_ERROR) return err;
-
-    void* buf = output.writeInplace(len);
-    if (buf == NULL) return NO_MEMORY;
-
-    err = transparentRegion.write(buf, len);
+    err = output.write(transparentRegion);
     if (err < NO_ERROR) return err;
 
     // NOTE: regions are at the end of the structure
@@ -46,11 +39,8 @@
 status_t layer_state_t::read(const Parcel& input)
 {
     status_t err;
-    size_t len = input.readInt32();
-    void const* buf = input.readInplace(len);
-    if (buf == NULL) return NO_MEMORY;
 
-    err = transparentRegion.read(buf);
+    err = input.read(transparentRegion);
     if (err < NO_ERROR) return err;
 
     // NOTE: regions are at the end of the structure
@@ -77,8 +67,8 @@
     output.writeInt32(what);
     output.writeInt32(layerStack);
     output.writeInt32(orientation);
-    memcpy(output.writeInplace(sizeof(Rect)), &viewport, sizeof(Rect));
-    memcpy(output.writeInplace(sizeof(Rect)), &frame, sizeof(Rect));
+    output.write(viewport);
+    output.write(frame);
     return NO_ERROR;
 }
 
@@ -88,8 +78,8 @@
     what = input.readInt32();
     layerStack = input.readInt32();
     orientation = input.readInt32();
-    memcpy(&viewport, input.readInplace(sizeof(Rect)), sizeof(Rect));
-    memcpy(&frame,    input.readInplace(sizeof(Rect)), sizeof(Rect));
+    input.read(viewport);
+    input.read(frame);
     return NO_ERROR;
 }
 
diff --git a/libs/gui/Sensor.cpp b/libs/gui/Sensor.cpp
index 5cc76b4..c52a88f 100644
--- a/libs/gui/Sensor.cpp
+++ b/libs/gui/Sensor.cpp
@@ -98,7 +98,7 @@
     return mVersion;
 }
 
-size_t Sensor::getFlattenedSize() const
+size_t Sensor::getSize() const
 {
     return  sizeof(int32_t) + ((mName.length() + 3) & ~3) +
             sizeof(int32_t) + ((mVendor.length() + 3) & ~3) +
@@ -107,11 +107,6 @@
             sizeof(int32_t);
 }
 
-size_t Sensor::getFdCount() const
-{
-    return 0;
-}
-
 static inline
 size_t write(void* buffer, size_t offset, const String8& value) {
     memcpy(static_cast<char*>(buffer) + offset, value.string(), value.length());
@@ -130,12 +125,8 @@
     return sizeof(int32_t);
 }
 
-status_t Sensor::flatten(void* buffer, size_t size,
-        int fds[], size_t count) const
+status_t Sensor::flatten(void* buffer) const
 {
-    if (size < Sensor::getFlattenedSize())
-        return -ENOMEM;
-
     size_t offset = 0;
     offset += write(buffer, offset, int32_t(mName.length()));
     offset += write(buffer, offset, mName);
@@ -149,7 +140,6 @@
     offset += write(buffer, offset, mResolution);
     offset += write(buffer, offset, mPower);
     offset += write(buffer, offset, mMinDelay);
-
     return NO_ERROR;
 }
 
@@ -171,8 +161,7 @@
     return sizeof(int32_t);
 }
 
-status_t Sensor::unflatten(void const* buffer, size_t size,
-        int fds[], size_t count)
+status_t Sensor::unflatten(void const* buffer, size_t size)
 {
     int32_t len;
     size_t offset = 0;
@@ -188,7 +177,6 @@
     offset += read(buffer, offset, &mResolution);
     offset += read(buffer, offset, &mPower);
     offset += read(buffer, offset, &mMinDelay);
-
     return NO_ERROR;
 }
 
diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index 2c7cdf0..a3d8b01 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -66,12 +66,6 @@
 {
 }
 
-Region::Region(const void* buffer)
-{
-    status_t err = read(buffer);
-    ALOGE_IF(err<0, "error %s reading Region from buffer", strerror(err));
-}
-
 Region::~Region()
 {
 }
@@ -561,55 +555,33 @@
 
 // ----------------------------------------------------------------------------
 
-ssize_t Region::write(void* buffer, size_t size) const
-{
-#if VALIDATE_REGIONS
-    validate(*this, "write(buffer)");
-#endif
-    const size_t count = mStorage.size();
-    const size_t sizeNeeded = sizeof(int32_t) + (1+count)*sizeof(Rect);
-    if (buffer != NULL) {
-        if (sizeNeeded > size) return NO_MEMORY;
-        int32_t* const p = static_cast<int32_t*>(buffer);
-        *p = count;
-        memcpy(p+1, &mBounds, sizeof(Rect));
-        if (count) {
-            memcpy(p+5, mStorage.array(), count*sizeof(Rect));
+size_t Region::getSize() const {
+    return (mStorage.size() + 1) * sizeof(Rect);
+}
+
+status_t Region::flatten(void* buffer) const {
+    Rect* rects = reinterpret_cast<Rect*>(buffer);
+    *rects++ = mBounds;
+    memcpy(rects, mStorage.array(), mStorage.size() * sizeof(Rect));
+    return NO_ERROR;
+}
+
+status_t Region::unflatten(void const* buffer, size_t size) {
+    mStorage.clear();
+    if (size >= sizeof(Rect)) {
+        Rect const* rects = reinterpret_cast<Rect const*>(buffer);
+        mBounds = *rects++;
+        size -= sizeof(Rect);
+        size_t count = size / sizeof(Rect);
+        if (count > 0) {
+            ssize_t err = mStorage.insertAt(0, count);
+            if (err < 0) {
+                return status_t(err);
+            }
+            memcpy(mStorage.editArray(), rects, count*sizeof(Rect));
         }
     }
-    return ssize_t(sizeNeeded);
-}
-
-ssize_t Region::read(const void* buffer)
-{
-    int32_t const* const p = static_cast<int32_t const*>(buffer); 
-    const size_t count = *p;
-    memcpy(&mBounds, p+1, sizeof(Rect));
-    mStorage.clear();
-    if (count) {
-        mStorage.insertAt(0, count);
-        memcpy(mStorage.editArray(), p+5, count*sizeof(Rect));
-    }
-#if VALIDATE_REGIONS
-    validate(*this, "read(buffer)");
-#endif
-    return ssize_t(sizeof(int32_t) + (1+count)*sizeof(Rect));
-}
-
-ssize_t Region::writeEmpty(void* buffer, size_t size)
-{
-    const size_t sizeNeeded = sizeof(int32_t) + sizeof(Rect);
-    if (sizeNeeded > size) return NO_MEMORY;
-    int32_t* const p = static_cast<int32_t*>(buffer); 
-    memset(p, 0, sizeNeeded);
-    return ssize_t(sizeNeeded);
-}
-
-bool Region::isEmpty(void* buffer)
-{
-    int32_t const* const p = static_cast<int32_t const*>(buffer); 
-    Rect const* const b = reinterpret_cast<Rect const *>(p+1);
-    return b->isEmpty();
+    return NO_ERROR;
 }
 
 // ----------------------------------------------------------------------------