diff --git a/libs/surfaceflinger/LayerBitmap.cpp b/libs/surfaceflinger/LayerBitmap.cpp
new file mode 100644
index 0000000..e844350
--- /dev/null
+++ b/libs/surfaceflinger/LayerBitmap.cpp
@@ -0,0 +1,185 @@
+/*
+ * 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 <cutils/memory.h>
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <utils/MemoryDealer.h>
+#include <utils/IMemory.h>
+#include <ui/PixelFormat.h>
+#include <pixelflinger/pixelflinger.h>
+
+#include "LayerBitmap.h"
+#include "SurfaceFlinger.h"
+#include "VRamHeap.h"
+
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+LayerBitmap::LayerBitmap()
+    : mAllocFlags(0), mOffset(0), mSize(-1U), mAlignment(2)
+{
+    memset(&mSurface, 0, sizeof(mSurface));
+}
+
+LayerBitmap::~LayerBitmap()
+{
+    mSurface.data = 0;
+}
+
+status_t LayerBitmap::init(const sp<MemoryDealer>& allocator)
+{
+    if (mAllocator != NULL)
+        return BAD_VALUE;
+    mAllocator = allocator;
+    return NO_ERROR;
+}
+
+status_t LayerBitmap::setBits(uint32_t w, uint32_t h, uint32_t alignment, 
+        PixelFormat format, uint32_t flags)
+{
+    const sp<MemoryDealer>& allocator(mAllocator);
+    if (allocator == NULL)
+        return NO_INIT;
+
+    if (UNLIKELY(w == mSurface.width && h == mSurface.height &&
+            format == mSurface.format))
+    { // same format and size, do nothing.
+        return NO_ERROR;
+    }
+
+    PixelFormatInfo info;
+    getPixelFormatInfo(format, &info);
+
+    uint32_t allocFlags = MemoryDealer::PAGE_ALIGNED;
+    const uint32_t align = 4; // must match GL_UNPACK_ALIGNMENT
+    const uint32_t Bpp = info.bytesPerPixel;
+    uint32_t stride = (w + (alignment-1)) & ~(alignment-1);
+    stride = ((stride * Bpp + (align-1)) & ~(align-1)) / Bpp;
+    size_t size = info.getScanlineSize(stride) * h;
+    if (allocFlags & MemoryDealer::PAGE_ALIGNED) {
+        size_t pagesize = getpagesize();
+        size = (size + (pagesize-1)) & ~(pagesize-1);
+    }
+
+    /* FIXME: we should be able to have a h/v stride because the user of the
+     * surface might have stride limitation (for instance h/w codecs often do)
+     */
+    int32_t vstride = 0;
+
+    mAlignment = alignment;
+    mAllocFlags = allocFlags;
+    mOffset = 0;
+    if (mSize != size) {
+        // would be nice to have a reallocate() api
+        mBitsMemory.clear(); // free-memory
+        mBitsMemory = allocator->allocate(size, allocFlags);
+        mSize = size;
+    } else {
+        // don't erase memory if we didn't have to reallocate
+        flags &= ~SECURE_BITS;
+    }
+    if (mBitsMemory != 0) {
+        mOffset = mBitsMemory->offset();
+        mSurface.data = static_cast<GGLubyte*>(mBitsMemory->pointer());
+        mSurface.version = sizeof(GGLSurface);
+        mSurface.width  = w;
+        mSurface.height = h;
+        mSurface.stride = stride;
+        mSurface.vstride = vstride;
+        mSurface.format = format;
+        if (flags & SECURE_BITS)
+            clear();
+    }
+
+    if (mBitsMemory==0 || mSurface.data==0) {
+        LOGE("not enough memory for layer bitmap size=%u", size);
+        allocator->dump("LayerBitmap");
+        mSurface.data = 0;
+        mSize = -1U;
+        return NO_MEMORY;
+    }
+    return NO_ERROR;
+}
+
+void LayerBitmap::clear()
+{
+    // NOTE: this memset should not be necessary, at least for
+    // opaque surface. However, for security reasons it's better to keep it
+    // (in the case of pmem, it's possible that the memory contains old
+    // data)
+    if (mSurface.data) {
+        memset(mSurface.data, 0, mSize);
+        //if (bytesPerPixel(mSurface.format) == 4) {
+        //    android_memset32((uint32_t*)mSurface.data, 0xFF0000FF, mSize);
+        //} else  {
+        //    android_memset16((uint16_t*)mSurface.data, 0xF800, mSize);
+        //}
+    }
+}
+
+status_t LayerBitmap::getInfo(surface_info_t* info) const
+{
+    if (mSurface.data == 0) {
+        memset(info, 0, sizeof(surface_info_t));
+        info->bits_offset = NO_MEMORY;
+        return NO_MEMORY;
+    }
+    info->w     = uint16_t(width());
+    info->h     = uint16_t(height());
+    info->stride= uint16_t(stride());
+    info->bpr   = uint16_t(stride() * bytesPerPixel(pixelFormat()));
+    info->format= uint8_t(pixelFormat());
+    info->flags = surface_info_t::eBufferDirty;
+    info->bits_offset = ssize_t(mOffset);
+    return NO_ERROR;
+}
+
+status_t LayerBitmap::resize(uint32_t w, uint32_t h)
+{
+    int err = setBits(w, h, mAlignment, pixelFormat(), SECURE_BITS);
+    return err;
+}
+
+size_t LayerBitmap::size() const
+{
+    return mSize;
+}
+
+void LayerBitmap::getBitmapSurface(copybit_image_t* img) const
+{
+    const sp<IMemoryHeap>& mh(getAllocator()->getMemoryHeap());
+    void* sbase = mh->base();
+    const GGLSurface& t(surface());
+    img->w = t.stride  ?: t.width;
+    img->h = t.vstride ?: t.height;
+    img->format = t.format;
+    img->offset = intptr_t(t.data) - intptr_t(sbase);
+    img->base = sbase;
+    img->fd = mh->heapID();
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android