diff --git a/libs/surfaceflinger/LayerDim.cpp b/libs/surfaceflinger/LayerDim.cpp
new file mode 100644
index 0000000..0c347cc
--- /dev/null
+++ b/libs/surfaceflinger/LayerDim.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "SurfaceFlinger"
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+
+#include "LayerDim.h"
+#include "SurfaceFlinger.h"
+#include "VRamHeap.h"
+#include "DisplayHardware/DisplayHardware.h"
+
+namespace android {
+// ---------------------------------------------------------------------------
+
+const uint32_t LayerDim::typeInfo = LayerBaseClient::typeInfo | 0x10;
+const char* const LayerDim::typeID = "LayerDim";
+sp<MemoryDealer> LayerDim::mDimmerDealer;
+LayerBitmap LayerDim::mDimmerBitmap;
+
+// ---------------------------------------------------------------------------
+
+LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
+        Client* client, int32_t i)
+     : LayerBaseClient(flinger, display, client, i)
+{
+}
+
+void LayerDim::initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h)
+{
+    // must only be called once.
+    mDimmerDealer = flinger->getSurfaceHeapManager()
+            ->createHeap(ISurfaceComposer::eHardware);
+    if (mDimmerDealer != 0) {
+        mDimmerBitmap.init(mDimmerDealer);
+        mDimmerBitmap.setBits(w, h, 1, PIXEL_FORMAT_RGB_565);
+        mDimmerBitmap.clear();
+    }
+}
+
+LayerDim::~LayerDim()
+{
+}
+
+void LayerDim::onDraw(const Region& clip) const
+{
+    const State& s(drawingState());
+
+    Region::iterator iterator(clip);
+    if (s.alpha>0 && iterator) {
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+
+        status_t err = NO_ERROR;
+        const int can_use_copybit = canUseCopybit();
+        if (can_use_copybit)  {
+            // StopWatch watch("copybit");
+            copybit_image_t dst;
+            hw.getDisplaySurface(&dst);
+            const copybit_rect_t& drect
+                = reinterpret_cast<const copybit_rect_t&>(mTransformedBounds);
+
+            copybit_image_t src;
+            mDimmerBitmap.getBitmapSurface(&src);
+            const copybit_rect_t& srect(drect);
+
+            copybit_device_t* copybit = mFlinger->getBlitEngine();
+            copybit->set_parameter(copybit, COPYBIT_TRANSFORM, 0);
+            copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, s.alpha);
+            copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_ENABLE);
+            region_iterator it(clip);
+            err = copybit->stretch(copybit, &dst, &src, &drect, &srect, &it);
+        }
+
+        if (!can_use_copybit || err) {
+            const GGLfixed alpha = (s.alpha << 16)/255;
+            const uint32_t fbHeight = hw.getHeight();
+            glDisable(GL_TEXTURE_2D);
+            glDisable(GL_DITHER);
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+            glColor4x(0, 0, 0, alpha);
+            glVertexPointer(2, GL_FIXED, 0, mVertices);
+            Rect r;
+            while (iterator.iterate(&r)) {
+                const GLint sy = fbHeight - (r.top + r.height());
+                glScissor(r.left, sy, r.width(), r.height());
+                glDrawArrays(GL_TRIANGLE_FAN, 0, 4); 
+            }
+        }
+    }
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android