diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index e967265..a180606 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2112,6 +2112,149 @@
     // here the transaction has been committed
 }
 
+void SurfaceFlinger::processDisplayChangesLocked() {
+    // here we take advantage of Vector's copy-on-write semantics to
+    // improve performance by skipping the transaction entirely when
+    // know that the lists are identical
+    const KeyedVector<wp<IBinder>, DisplayDeviceState>& curr(mCurrentState.displays);
+    const KeyedVector<wp<IBinder>, DisplayDeviceState>& draw(mDrawingState.displays);
+    if (!curr.isIdenticalTo(draw)) {
+        mVisibleRegionsDirty = true;
+        const size_t cc = curr.size();
+        size_t dc = draw.size();
+
+        // find the displays that were removed
+        // (ie: in drawing state but not in current state)
+        // also handle displays that changed
+        // (ie: displays that are in both lists)
+        for (size_t i = 0; i < dc;) {
+            const ssize_t j = curr.indexOfKey(draw.keyAt(i));
+            if (j < 0) {
+                // in drawing state but not in current state
+                if (!draw[i].isMainDisplay()) {
+                    // Call makeCurrent() on the primary display so we can
+                    // be sure that nothing associated with this display
+                    // is current.
+                    const sp<const DisplayDevice> defaultDisplay(getDefaultDisplayDeviceLocked());
+                    defaultDisplay->makeCurrent();
+                    sp<DisplayDevice> hw(getDisplayDeviceLocked(draw.keyAt(i)));
+                    if (hw != nullptr) hw->disconnect(getHwComposer());
+                    if (draw[i].type < DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES)
+                        mEventThread->onHotplugReceived(draw[i].type, false);
+                    mDisplays.removeItem(draw.keyAt(i));
+                } else {
+                    ALOGW("trying to remove the main display");
+                }
+            } else {
+                // this display is in both lists. see if something changed.
+                const DisplayDeviceState& state(curr[j]);
+                const wp<IBinder>& display(curr.keyAt(j));
+                const sp<IBinder> state_binder = IInterface::asBinder(state.surface);
+                const sp<IBinder> draw_binder = IInterface::asBinder(draw[i].surface);
+                if (state_binder != draw_binder) {
+                    // changing the surface is like destroying and
+                    // recreating the DisplayDevice, so we just remove it
+                    // from the drawing state, so that it get re-added
+                    // below.
+                    sp<DisplayDevice> hw(getDisplayDeviceLocked(display));
+                    if (hw != nullptr) hw->disconnect(getHwComposer());
+                    mDisplays.removeItem(display);
+                    mDrawingState.displays.removeItemsAt(i);
+                    dc--;
+                    // at this point we must loop to the next item
+                    continue;
+                }
+
+                const sp<DisplayDevice> disp(getDisplayDeviceLocked(display));
+                if (disp != nullptr) {
+                    if (state.layerStack != draw[i].layerStack) {
+                        disp->setLayerStack(state.layerStack);
+                    }
+                    if ((state.orientation != draw[i].orientation) ||
+                        (state.viewport != draw[i].viewport) || (state.frame != draw[i].frame)) {
+                        disp->setProjection(state.orientation, state.viewport, state.frame);
+                    }
+                    if (state.width != draw[i].width || state.height != draw[i].height) {
+                        disp->setDisplaySize(state.width, state.height);
+                    }
+                }
+            }
+            ++i;
+        }
+
+        // find displays that were added
+        // (ie: in current state but not in drawing state)
+        for (size_t i = 0; i < cc; i++) {
+            if (draw.indexOfKey(curr.keyAt(i)) < 0) {
+                const DisplayDeviceState& state(curr[i]);
+
+                sp<DisplaySurface> dispSurface;
+                sp<IGraphicBufferProducer> producer;
+                sp<IGraphicBufferProducer> bqProducer;
+                sp<IGraphicBufferConsumer> bqConsumer;
+                BufferQueue::createBufferQueue(&bqProducer, &bqConsumer);
+
+                int32_t hwcId = -1;
+                if (state.isVirtualDisplay()) {
+                    // Virtual displays without a surface are dormant:
+                    // they have external state (layer stack, projection,
+                    // etc.) but no internal state (i.e. a DisplayDevice).
+                    if (state.surface != nullptr) {
+                        // Allow VR composer to use virtual displays.
+                        if (mUseHwcVirtualDisplays || getBE().mHwc->isUsingVrComposer()) {
+                            int width = 0;
+                            int status = state.surface->query(NATIVE_WINDOW_WIDTH, &width);
+                            ALOGE_IF(status != NO_ERROR, "Unable to query width (%d)", status);
+                            int height = 0;
+                            status = state.surface->query(NATIVE_WINDOW_HEIGHT, &height);
+                            ALOGE_IF(status != NO_ERROR, "Unable to query height (%d)", status);
+                            int intFormat = 0;
+                            status = state.surface->query(NATIVE_WINDOW_FORMAT, &intFormat);
+                            ALOGE_IF(status != NO_ERROR, "Unable to query format (%d)", status);
+                            auto format = static_cast<android_pixel_format_t>(intFormat);
+
+                            getBE().mHwc->allocateVirtualDisplay(width, height, &format, &hwcId);
+                        }
+
+                        // TODO: Plumb requested format back up to consumer
+
+                        sp<VirtualDisplaySurface> vds =
+                                new VirtualDisplaySurface(*getBE().mHwc, hwcId, state.surface,
+                                                          bqProducer, bqConsumer,
+                                                          state.displayName);
+
+                        dispSurface = vds;
+                        producer = vds;
+                    }
+                } else {
+                    ALOGE_IF(state.surface != nullptr,
+                             "adding a supported display, but rendering "
+                             "surface is provided (%p), ignoring it",
+                             state.surface.get());
+
+                    hwcId = state.type;
+                    dispSurface = new FramebufferSurface(*getBE().mHwc, hwcId, bqConsumer);
+                    producer = bqProducer;
+                }
+
+                const wp<IBinder>& display(curr.keyAt(i));
+                if (dispSurface != nullptr) {
+                    sp<DisplayDevice> hw =
+                            new DisplayDevice(this, state.type, hwcId, state.isSecure, display,
+                                              dispSurface, producer, hasWideColorDisplay);
+                    hw->setLayerStack(state.layerStack);
+                    hw->setProjection(state.orientation, state.viewport, state.frame);
+                    hw->setDisplayName(state.displayName);
+                    mDisplays.add(display, hw);
+                    if (!state.isVirtualDisplay()) {
+                        mEventThread->onHotplugReceived(state.type, true);
+                    }
+                }
+            }
+        }
+    }
+}
+
 void SurfaceFlinger::handleTransactionLocked(uint32_t transactionFlags)
 {
     // Notify all layers of available frames
@@ -2140,161 +2283,7 @@
      */
 
     if (transactionFlags & eDisplayTransactionNeeded) {
-        // here we take advantage of Vector's copy-on-write semantics to
-        // improve performance by skipping the transaction entirely when
-        // know that the lists are identical
-        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& curr(mCurrentState.displays);
-        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& draw(mDrawingState.displays);
-        if (!curr.isIdenticalTo(draw)) {
-            mVisibleRegionsDirty = true;
-            const size_t cc = curr.size();
-                  size_t dc = draw.size();
-
-            // find the displays that were removed
-            // (ie: in drawing state but not in current state)
-            // also handle displays that changed
-            // (ie: displays that are in both lists)
-            for (size_t i=0 ; i<dc ;) {
-                const ssize_t j = curr.indexOfKey(draw.keyAt(i));
-                if (j < 0) {
-                    // in drawing state but not in current state
-                    if (!draw[i].isMainDisplay()) {
-                        // Call makeCurrent() on the primary display so we can
-                        // be sure that nothing associated with this display
-                        // is current.
-                        const sp<const DisplayDevice> defaultDisplay(getDefaultDisplayDeviceLocked());
-                        defaultDisplay->makeCurrent();
-                        sp<DisplayDevice> hw(getDisplayDeviceLocked(draw.keyAt(i)));
-                        if (hw != nullptr)
-                            hw->disconnect(getHwComposer());
-                        if (draw[i].type < DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES)
-                            mEventThread->onHotplugReceived(draw[i].type, false);
-                        mDisplays.removeItem(draw.keyAt(i));
-                    } else {
-                        ALOGW("trying to remove the main display");
-                    }
-                } else {
-                    // this display is in both lists. see if something changed.
-                    const DisplayDeviceState& state(curr[j]);
-                    const wp<IBinder>& display(curr.keyAt(j));
-                    const sp<IBinder> state_binder = IInterface::asBinder(state.surface);
-                    const sp<IBinder> draw_binder = IInterface::asBinder(draw[i].surface);
-                    if (state_binder != draw_binder) {
-                        // changing the surface is like destroying and
-                        // recreating the DisplayDevice, so we just remove it
-                        // from the drawing state, so that it get re-added
-                        // below.
-                        sp<DisplayDevice> hw(getDisplayDeviceLocked(display));
-                        if (hw != nullptr)
-                            hw->disconnect(getHwComposer());
-                        mDisplays.removeItem(display);
-                        mDrawingState.displays.removeItemsAt(i);
-                        dc--;
-                        // at this point we must loop to the next item
-                        continue;
-                    }
-
-                    const sp<DisplayDevice> disp(getDisplayDeviceLocked(display));
-                    if (disp != nullptr) {
-                        if (state.layerStack != draw[i].layerStack) {
-                            disp->setLayerStack(state.layerStack);
-                        }
-                        if ((state.orientation != draw[i].orientation)
-                                || (state.viewport != draw[i].viewport)
-                                || (state.frame != draw[i].frame))
-                        {
-                            disp->setProjection(state.orientation,
-                                    state.viewport, state.frame);
-                        }
-                        if (state.width != draw[i].width || state.height != draw[i].height) {
-                            disp->setDisplaySize(state.width, state.height);
-                        }
-                    }
-                }
-                ++i;
-            }
-
-            // find displays that were added
-            // (ie: in current state but not in drawing state)
-            for (size_t i=0 ; i<cc ; i++) {
-                if (draw.indexOfKey(curr.keyAt(i)) < 0) {
-                    const DisplayDeviceState& state(curr[i]);
-
-                    sp<DisplaySurface> dispSurface;
-                    sp<IGraphicBufferProducer> producer;
-                    sp<IGraphicBufferProducer> bqProducer;
-                    sp<IGraphicBufferConsumer> bqConsumer;
-                    BufferQueue::createBufferQueue(&bqProducer, &bqConsumer);
-
-                    int32_t hwcId = -1;
-                    if (state.isVirtualDisplay()) {
-                        // Virtual displays without a surface are dormant:
-                        // they have external state (layer stack, projection,
-                        // etc.) but no internal state (i.e. a DisplayDevice).
-                        if (state.surface != nullptr) {
-
-                            // Allow VR composer to use virtual displays.
-                            if (mUseHwcVirtualDisplays || getBE().mHwc->isUsingVrComposer()) {
-                                int width = 0;
-                                int status = state.surface->query(
-                                        NATIVE_WINDOW_WIDTH, &width);
-                                ALOGE_IF(status != NO_ERROR,
-                                        "Unable to query width (%d)", status);
-                                int height = 0;
-                                status = state.surface->query(
-                                        NATIVE_WINDOW_HEIGHT, &height);
-                                ALOGE_IF(status != NO_ERROR,
-                                        "Unable to query height (%d)", status);
-                                int intFormat = 0;
-                                status = state.surface->query(
-                                        NATIVE_WINDOW_FORMAT, &intFormat);
-                                ALOGE_IF(status != NO_ERROR,
-                                        "Unable to query format (%d)", status);
-                                auto format = static_cast<android_pixel_format_t>(
-                                        intFormat);
-
-                                getBE().mHwc->allocateVirtualDisplay(width, height, &format,
-                                        &hwcId);
-                            }
-
-                            // TODO: Plumb requested format back up to consumer
-
-                            sp<VirtualDisplaySurface> vds =
-                                    new VirtualDisplaySurface(*getBE().mHwc,
-                                            hwcId, state.surface, bqProducer,
-                                            bqConsumer, state.displayName);
-
-                            dispSurface = vds;
-                            producer = vds;
-                        }
-                    } else {
-                        ALOGE_IF(state.surface != nullptr,
-                                "adding a supported display, but rendering "
-                                "surface is provided (%p), ignoring it",
-                                state.surface.get());
-
-                        hwcId = state.type;
-                        dispSurface = new FramebufferSurface(*getBE().mHwc, hwcId, bqConsumer);
-                        producer = bqProducer;
-                    }
-
-                    const wp<IBinder>& display(curr.keyAt(i));
-                    if (dispSurface != nullptr) {
-                        sp<DisplayDevice> hw =
-                                new DisplayDevice(this, state.type, hwcId, state.isSecure, display,
-                                                  dispSurface, producer, hasWideColorDisplay);
-                        hw->setLayerStack(state.layerStack);
-                        hw->setProjection(state.orientation,
-                                state.viewport, state.frame);
-                        hw->setDisplayName(state.displayName);
-                        mDisplays.add(display, hw);
-                        if (!state.isVirtualDisplay()) {
-                            mEventThread->onHotplugReceived(state.type, true);
-                        }
-                    }
-                }
-            }
-        }
+        processDisplayChangesLocked();
     }
 
     if (transactionFlags & (eTraversalNeeded|eDisplayTransactionNeeded)) {