diff --git a/libs/gui/bufferqueue/1.0/H2BGraphicBufferProducer.cpp b/libs/gui/bufferqueue/1.0/H2BGraphicBufferProducer.cpp
index e64ba9b..cee1b81 100644
--- a/libs/gui/bufferqueue/1.0/H2BGraphicBufferProducer.cpp
+++ b/libs/gui/bufferqueue/1.0/H2BGraphicBufferProducer.cpp
@@ -1061,7 +1061,7 @@
 
 status_t H2BGraphicBufferProducer::attachBuffer(
         int* outSlot, const sp<GraphicBuffer>& buffer) {
-    AnwBuffer tBuffer;
+    AnwBuffer tBuffer{};
     wrapAs(&tBuffer, *buffer);
     status_t fnStatus;
     status_t transStatus = toStatusT(mBase->attachBuffer(tBuffer,
@@ -1076,7 +1076,7 @@
         int slot,
         const QueueBufferInput& input,
         QueueBufferOutput* output) {
-    HGraphicBufferProducer::QueueBufferInput tInput;
+    HGraphicBufferProducer::QueueBufferInput tInput{};
     native_handle_t* nh;
     if (!wrapAs(&tInput, &nh, input)) {
         ALOGE("H2BGraphicBufferProducer::queueBuffer - "
diff --git a/libs/gui/bufferqueue/2.0/B2HGraphicBufferProducer.cpp b/libs/gui/bufferqueue/2.0/B2HGraphicBufferProducer.cpp
index e039593..e891ec5 100644
--- a/libs/gui/bufferqueue/2.0/B2HGraphicBufferProducer.cpp
+++ b/libs/gui/bufferqueue/2.0/B2HGraphicBufferProducer.cpp
@@ -15,7 +15,7 @@
  */
 
 //#define LOG_NDEBUG 0
-#define LOG_TAG "H2BGraphicBufferProducer@2.0"
+#define LOG_TAG "B2HGraphicBufferProducer@2.0"
 
 #include <android-base/logging.h>
 
@@ -30,13 +30,38 @@
 #include <vndk/hardware_buffer.h>
 
 namespace android {
-
 namespace hardware {
 namespace graphics {
 namespace bufferqueue {
 namespace V2_0 {
 namespace utils {
 
+namespace /* unnamed */ {
+
+using BQueueBufferInput = ::android::
+        IGraphicBufferProducer::QueueBufferInput;
+using HQueueBufferInput = ::android::hardware::graphics::bufferqueue::V2_0::
+        IGraphicBufferProducer::QueueBufferInput;
+using BQueueBufferOutput = ::android::
+        IGraphicBufferProducer::QueueBufferOutput;
+using HQueueBufferOutput = ::android::hardware::graphics::bufferqueue::V2_0::
+        IGraphicBufferProducer::QueueBufferOutput;
+
+using ::android::hardware::graphics::bufferqueue::V2_0::utils::b2h;
+using ::android::hardware::graphics::bufferqueue::V2_0::utils::h2b;
+
+bool b2h(BQueueBufferOutput const& from, HQueueBufferOutput* to) {
+    to->width = from.width;
+    to->height = from.height;
+    to->transformHint = static_cast<int32_t>(from.transformHint);
+    to->numPendingBuffers = from.numPendingBuffers;
+    to->nextFrameNumber = from.nextFrameNumber;
+    to->bufferReplaced = from.bufferReplaced;
+    return true;
+}
+
+} // unnamed namespace
+
 // B2HGraphicBufferProducer
 // ========================
 
@@ -161,11 +186,7 @@
         int32_t slot,
         QueueBufferInput const& hInput,
         queueBuffer_cb _hidl_cb) {
-    using HOutput = QueueBufferOutput;
-    using BInput = BGraphicBufferProducer::QueueBufferInput;
-    using BOutput = BGraphicBufferProducer::QueueBufferOutput;
-
-    BInput bInput{
+    BQueueBufferInput bInput{
             hInput.timestamp,
             hInput.isAutoTimestamp,
             static_cast<android_dataspace>(hInput.dataSpace),
@@ -178,35 +199,32 @@
 
     // Convert crop.
     if (!h2b(hInput.crop, &bInput.crop)) {
-        _hidl_cb(HStatus::UNKNOWN_ERROR, HOutput{});
+        _hidl_cb(HStatus::UNKNOWN_ERROR, QueueBufferOutput{});
         return {};
     }
 
     // Convert surfaceDamage.
     if (!h2b(hInput.surfaceDamage, &bInput.surfaceDamage)) {
-        _hidl_cb(HStatus::UNKNOWN_ERROR, HOutput{});
+        _hidl_cb(HStatus::UNKNOWN_ERROR, QueueBufferOutput{});
         return {};
     }
 
     // Convert fence.
     if (!h2b(hInput.fence, &bInput.fence)) {
-        _hidl_cb(HStatus::UNKNOWN_ERROR, HOutput{});
+        _hidl_cb(HStatus::UNKNOWN_ERROR, QueueBufferOutput{});
         return {};
     }
 
-    BOutput bOutput{};
+    BQueueBufferOutput bOutput{};
     HStatus hStatus{};
-    bool converted = b2h(
-            mBase->queueBuffer(static_cast<int>(slot), bInput, &bOutput),
-            &hStatus);
+    QueueBufferOutput hOutput{};
+    bool converted =
+            b2h(
+                mBase->queueBuffer(static_cast<int>(slot), bInput, &bOutput),
+                &hStatus) &&
+            b2h(bOutput, &hOutput);
 
-    _hidl_cb(converted ? hStatus : HStatus::UNKNOWN_ERROR,
-             HOutput{bOutput.width,
-                     bOutput.height,
-                     static_cast<int32_t>(bOutput.transformHint),
-                     bOutput.numPendingBuffers,
-                     bOutput.nextFrameNumber,
-                     bOutput.bufferReplaced});
+    _hidl_cb(converted ? hStatus : HStatus::UNKNOWN_ERROR, hOutput);
     return {};
 }
 
@@ -236,33 +254,23 @@
         HConnectionType hConnectionType,
         bool producerControlledByApp,
         connect_cb _hidl_cb) {
-    using BOutput = BGraphicBufferProducer::QueueBufferOutput;
-    using HOutput = HGraphicBufferProducer::QueueBufferOutput;
     sp<BProducerListener> bListener = new H2BProducerListener(hListener);
-    if (!bListener) {
-        _hidl_cb(HStatus::UNKNOWN_ERROR, HOutput{});
+    int bConnectionType{};
+    if (!bListener || !h2b(hConnectionType, &bConnectionType)) {
+        _hidl_cb(HStatus::UNKNOWN_ERROR, QueueBufferOutput{});
         return {};
     }
-    int bConnectionType;
-    if (!h2b(hConnectionType, &bConnectionType)) {
-        _hidl_cb(HStatus::UNKNOWN_ERROR, HOutput{});
-        return {};
-    }
-    BOutput bOutput{};
+    BQueueBufferOutput bOutput{};
     HStatus hStatus{};
-    bool converted = b2h(
-            mBase->connect(bListener,
-                           bConnectionType,
-                           producerControlledByApp,
-                           &bOutput),
-            &hStatus);
-    _hidl_cb(converted ? hStatus : HStatus::UNKNOWN_ERROR,
-             HOutput{bOutput.width,
-                     bOutput.height,
-                     static_cast<int32_t>(bOutput.transformHint),
-                     bOutput.numPendingBuffers,
-                     bOutput.nextFrameNumber,
-                     bOutput.bufferReplaced});
+    QueueBufferOutput hOutput{};
+    bool converted =
+            b2h(mBase->connect(bListener,
+                               bConnectionType,
+                               producerControlledByApp,
+                               &bOutput),
+                &hStatus) &&
+            b2h(bOutput, &hOutput);
+    _hidl_cb(converted ? hStatus : HStatus::UNKNOWN_ERROR, hOutput);
     return {};
 }
 
diff --git a/libs/gui/bufferqueue/2.0/H2BGraphicBufferProducer.cpp b/libs/gui/bufferqueue/2.0/H2BGraphicBufferProducer.cpp
index 1023ef1..2f5b73c 100644
--- a/libs/gui/bufferqueue/2.0/H2BGraphicBufferProducer.cpp
+++ b/libs/gui/bufferqueue/2.0/H2BGraphicBufferProducer.cpp
@@ -29,13 +29,54 @@
 #include <vndk/hardware_buffer.h>
 
 namespace android {
-
 namespace hardware {
 namespace graphics {
 namespace bufferqueue {
 namespace V2_0 {
 namespace utils {
 
+namespace /* unnamed */ {
+
+using BQueueBufferInput = ::android::
+        IGraphicBufferProducer::QueueBufferInput;
+using HQueueBufferInput = ::android::hardware::graphics::bufferqueue::V2_0::
+        IGraphicBufferProducer::QueueBufferInput;
+using BQueueBufferOutput = ::android::
+        IGraphicBufferProducer::QueueBufferOutput;
+using HQueueBufferOutput = ::android::hardware::graphics::bufferqueue::V2_0::
+        IGraphicBufferProducer::QueueBufferOutput;
+
+using ::android::hardware::graphics::bufferqueue::V2_0::utils::b2h;
+using ::android::hardware::graphics::bufferqueue::V2_0::utils::h2b;
+
+bool b2h(BQueueBufferInput const& from, HQueueBufferInput* to,
+         HFenceWrapper* hFenceWrapper) {
+    to->timestamp = from.timestamp;
+    to->isAutoTimestamp = static_cast<bool>(from.isAutoTimestamp);
+    to->dataSpace = static_cast<int32_t>(from.dataSpace);
+    to->transform = static_cast<int32_t>(from.transform);
+    to->stickyTransform = static_cast<int32_t>(from.stickyTransform);
+    if (!b2h(from.crop, &to->crop) ||
+            !b2h(from.surfaceDamage, &to->surfaceDamage) ||
+            !b2h(from.fence, hFenceWrapper)) {
+        return false;
+    }
+    to->fence = hFenceWrapper->getHandle();
+    return true;
+}
+
+bool h2b(HQueueBufferOutput const& from, BQueueBufferOutput* to) {
+    to->width = from.width;
+    to->height = from.height;
+    to->transformHint = static_cast<uint32_t>(from.transformHint);
+    to->numPendingBuffers = from.numPendingBuffers;
+    to->nextFrameNumber = from.nextFrameNumber;
+    to->bufferReplaced = from.bufferReplaced;
+    return true;
+}
+
+} // unnamed namespace
+
 // H2BGraphicBufferProducer
 // ========================
 
@@ -209,47 +250,13 @@
         int slot,
         QueueBufferInput const& input,
         QueueBufferOutput* output) {
-    HRect hCrop{};
-    (void)b2h(input.crop, &hCrop);
-
-    using HInput = HGraphicBufferProducer::QueueBufferInput;
-    HInput hInput{
-            input.timestamp,
-            static_cast<bool>(input.isAutoTimestamp),
-            static_cast<int32_t>(input.dataSpace),
-            {}, // crop
-            static_cast<int32_t>(input.transform),
-            static_cast<int32_t>(input.stickyTransform),
-            {}, // fence
-            {}  // surfaceDamage
-            };
-
-    // Convert crop.
-    if (!b2h(input.crop, &hInput.crop)) {
-        LOG(ERROR) << "queueBuffer: corrupted input crop rectangle.";
-        return UNKNOWN_ERROR;
-    }
-
-    // Convert surfaceDamage.
-    size_t numRects;
-    Rect const* rectArray = input.surfaceDamage.getArray(&numRects);
-    hInput.surfaceDamage.resize(numRects);
-    for (size_t i = 0; i < numRects; ++i) {
-        if (!b2h(rectArray[i], &hInput.surfaceDamage[i])) {
-            LOG(ERROR) << "queueBuffer: corrupted input surface damage.";
-            return UNKNOWN_ERROR;
-        }
-    }
-
-    // Convert fence.
+    HQueueBufferInput hInput{};
     HFenceWrapper hFenceWrapper;
-    if (!b2h(input.fence, &hFenceWrapper)) {
-        LOG(ERROR) << "queueBuffer: corrupted input fence.";
+    if (!b2h(input, &hInput, &hFenceWrapper)) {
+        LOG(ERROR) << "queueBuffer: corrupted input.";
         return UNKNOWN_ERROR;
     }
-    hInput.fence = hFenceWrapper.getHandle();
 
-    using HOutput = HGraphicBufferProducer::QueueBufferOutput;
     bool converted{};
     status_t bStatus{};
     Return<void> transResult = mBase->queueBuffer(
@@ -257,15 +264,8 @@
             hInput,
             [&converted, &bStatus, output](
                     HStatus hStatus,
-                    HOutput const& hOutput) {
-                converted = h2b(hStatus, &bStatus);
-                output->width = hOutput.width;
-                output->height = hOutput.height;
-                output->transformHint =
-                        static_cast<uint32_t>(hOutput.transformHint);
-                output->numPendingBuffers = hOutput.numPendingBuffers;
-                output->nextFrameNumber = hOutput.nextFrameNumber;
-                output->bufferReplaced = hOutput.bufferReplaced;
+                    HQueueBufferOutput const& hOutput) {
+                converted = h2b(hStatus, &bStatus) && h2b(hOutput, output);
             });
 
     if (!transResult.isOk()) {
@@ -332,7 +332,6 @@
         }
     }
 
-    using HOutput = HGraphicBufferProducer::QueueBufferOutput;
     bool converted{};
     status_t bStatus{};
     Return<void> transResult = mBase->connect(
@@ -341,15 +340,8 @@
             producerControlledByApp,
             [&converted, &bStatus, output](
                     HStatus hStatus,
-                    HOutput hOutput) {
-                converted = h2b(hStatus, &bStatus);
-                output->width = hOutput.width;
-                output->height = hOutput.height;
-                output->transformHint =
-                        static_cast<uint32_t>(hOutput.transformHint);
-                output->numPendingBuffers = hOutput.numPendingBuffers;
-                output->nextFrameNumber = hOutput.nextFrameNumber;
-                output->bufferReplaced = hOutput.bufferReplaced;
+                    HQueueBufferOutput const& hOutput) {
+                converted = h2b(hStatus, &bStatus) && h2b(hOutput, output);
             });
     if (!transResult.isOk()) {
         LOG(ERROR) << "connect: transaction failed.";