diff --git a/mobile/android/base/GeckoAppShell.java b/mobile/android/base/GeckoAppShell.java
index 9ca926e0371..75896432891 100644
--- a/mobile/android/base/GeckoAppShell.java
+++ b/mobile/android/base/GeckoAppShell.java
@@ -491,6 +491,15 @@ public class GeckoAppShell
     /*
      *  The Gecko-side API: API methods that Gecko calls
      */
+    public static void scheduleRedraw() {
+        // Redraw everything
+        Rect rect = new Rect(0, 0, LayerController.TILE_WIDTH, LayerController.TILE_HEIGHT);
+        GeckoEvent event = new GeckoEvent(GeckoEvent.DRAW, rect);
+        event.mNativeWindow = 0;
+        sendEventToGecko(event);
+    }
+
+
     public static void notifyIME(int type, int state) {
         mInputConnection.notifyIME(type, state);
     }
diff --git a/mobile/android/base/gfx/BufferedCairoImage.java b/mobile/android/base/gfx/BufferedCairoImage.java
index 619bc6ebb4f..7b9b1a514c9 100644
--- a/mobile/android/base/gfx/BufferedCairoImage.java
+++ b/mobile/android/base/gfx/BufferedCairoImage.java
@@ -46,22 +46,21 @@ import java.nio.ByteBuffer;
 /** A Cairo image that simply saves a buffer of pixel data. */
 public class BufferedCairoImage extends CairoImage {
     private ByteBuffer mBuffer;
-    private IntSize mSize;
-    private int mFormat;
+    private int mWidth, mHeight, mFormat;
     private boolean mNeedToFreeBuffer = false;
 
     /** Creates a buffered Cairo image from a byte buffer. */
     public BufferedCairoImage(ByteBuffer inBuffer, int inWidth, int inHeight, int inFormat) {
-        mBuffer = inBuffer; mSize = new IntSize(inWidth, inHeight); mFormat = inFormat;
+        mBuffer = inBuffer; mWidth = inWidth; mHeight = inHeight; mFormat = inFormat;
     }
 
     /** Creates a buffered Cairo image from an Android bitmap. */
     public BufferedCairoImage(Bitmap bitmap) {
         mFormat = CairoUtils.bitmapConfigToCairoFormat(bitmap.getConfig());
-        mSize = new IntSize(bitmap.getWidth(), bitmap.getHeight());
+        mWidth = bitmap.getWidth();
+        mHeight = bitmap.getHeight();
         mNeedToFreeBuffer = true;
-        // XXX Why is this * 4? Shouldn't it depend on mFormat?
-        mBuffer = GeckoAppShell.allocateDirectBuffer(mSize.getArea() * 4);
+        mBuffer = GeckoAppShell.allocateDirectBuffer(mWidth * mHeight * 4);
         bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
     }
 
@@ -79,7 +78,9 @@ public class BufferedCairoImage extends CairoImage {
    @Override
     public ByteBuffer getBuffer() { return mBuffer; }
     @Override
-    public IntSize getSize() { return mSize; }
+    public int getWidth() { return mWidth; }
+    @Override
+    public int getHeight() { return mHeight; }
     @Override
     public int getFormat() { return mFormat; }
 }
diff --git a/mobile/android/base/gfx/CairoImage.java b/mobile/android/base/gfx/CairoImage.java
index 06c389dd052..cb7b6071187 100644
--- a/mobile/android/base/gfx/CairoImage.java
+++ b/mobile/android/base/gfx/CairoImage.java
@@ -45,7 +45,8 @@ import java.nio.ByteBuffer;
 public abstract class CairoImage {
     public abstract ByteBuffer getBuffer();
 
-    public abstract IntSize getSize();
+    public abstract int getWidth();
+    public abstract int getHeight();
     public abstract int getFormat();
 
     public static final int FORMAT_INVALID = -1;
diff --git a/mobile/android/base/gfx/GeckoSoftwareLayerClient.java b/mobile/android/base/gfx/GeckoSoftwareLayerClient.java
index 84187ea276f..26f0c713726 100644
--- a/mobile/android/base/gfx/GeckoSoftwareLayerClient.java
+++ b/mobile/android/base/gfx/GeckoSoftwareLayerClient.java
@@ -72,9 +72,8 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
     private static final String LOGTAG = "GeckoSoftwareLayerClient";
 
     private Context mContext;
-    private int mFormat;
+    private int mWidth, mHeight, mFormat;
     private IntSize mScreenSize, mViewportSize;
-    private IntSize mBufferSize;
     private ByteBuffer mBuffer;
     private final SingleTileLayer mTileLayer;
 
@@ -98,15 +97,21 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
     public GeckoSoftwareLayerClient(Context context) {
         mContext = context;
 
-        mScreenSize = new IntSize(0, 0);
-        mBufferSize = new IntSize(0, 0);
+        mWidth = LayerController.TILE_WIDTH;
+        mHeight = LayerController.TILE_HEIGHT;
         mFormat = CairoImage.FORMAT_RGB16_565;
 
+        mScreenSize = new IntSize(1, 1);
+
+        mBuffer = GeckoAppShell.allocateDirectBuffer(mWidth * mHeight * 2);
+
         mCairoImage = new CairoImage() {
             @Override
             public ByteBuffer getBuffer() { return mBuffer; }
             @Override
-            public IntSize getSize() { return mBufferSize; }
+            public int getWidth() { return mWidth; }
+            @Override
+            public int getHeight() { return mHeight; }
             @Override
             public int getFormat() { return mFormat; }
         };
@@ -136,6 +141,7 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
             layerController.notifyPanZoomControllerOfGeometryChange(false);
         }
 
+        geometryChanged();
         GeckoAppShell.registerGeckoEventListener("Viewport:Update", this);
         GeckoAppShell.registerGeckoEventListener("Viewport:UpdateLater", this);
     }
@@ -203,7 +209,7 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
 
     public Bitmap getBitmap() {
         try {
-            Bitmap b = Bitmap.createBitmap(mBufferSize.width, mBufferSize.height,
+            Bitmap b = Bitmap.createBitmap(mWidth, mHeight,
                                            CairoUtils.cairoFormatTobitmapConfig(mFormat));
             b.copyPixelsFromBuffer(mBuffer.asIntBuffer());
             return b;
@@ -235,28 +241,9 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
         if (metrics.widthPixels != mScreenSize.width ||
             metrics.heightPixels != mScreenSize.height) {
             mScreenSize = new IntSize(metrics.widthPixels, metrics.heightPixels);
-            int maxSize = getLayerController().getView().getMaxTextureSize();
-
-            // XXX Introduce tiling to solve this?
-            if (mScreenSize.width > maxSize || mScreenSize.height > maxSize)
-                throw new RuntimeException("Screen size of " + mScreenSize + " larger than maximum texture size of " + maxSize);
-
-            // Round to next power of two until we use NPOT texture support
-            mBufferSize = new IntSize(Math.min(maxSize, IntSize.nextPowerOfTwo(mScreenSize.width + LayerController.MIN_BUFFER.width)),
-                                      Math.min(maxSize, IntSize.nextPowerOfTwo(mScreenSize.height + LayerController.MIN_BUFFER.height)));
-
-            // Free the old buffer first, if it exists
-            if (mBuffer != null) {
-                GeckoAppShell.freeDirectBuffer(mBuffer);
-                mBuffer = null;
-            }
-
-            // * 2 because it's a 16-bit buffer (so 2 bytes per pixel).
-            mBuffer = GeckoAppShell.allocateDirectBuffer(mBufferSize.getArea() * 2);
-
             Log.i(LOGTAG, "Screen-size changed to " + mScreenSize);
             GeckoEvent event = new GeckoEvent(GeckoEvent.SIZE_CHANGED,
-                                              mBufferSize.width, mBufferSize.height,
+                                              LayerController.TILE_WIDTH, LayerController.TILE_HEIGHT,
                                               metrics.widthPixels, metrics.heightPixels);
             GeckoAppShell.sendEventToGecko(event);
         }
@@ -302,7 +289,7 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
         ViewportMetrics viewportMetrics =
             new ViewportMetrics(getLayerController().getViewportMetrics());
 
-        PointF viewportOffset = viewportMetrics.getOptimumViewportOffset(mBufferSize);
+        PointF viewportOffset = viewportMetrics.getOptimumViewportOffset();
         viewportMetrics.setViewportOffset(viewportOffset);
         viewportMetrics.setViewport(viewportMetrics.getClampedViewport());
 
diff --git a/mobile/android/base/gfx/IntSize.java b/mobile/android/base/gfx/IntSize.java
index 2819abdaf23..e22744142d7 100644
--- a/mobile/android/base/gfx/IntSize.java
+++ b/mobile/android/base/gfx/IntSize.java
@@ -62,18 +62,10 @@ public class IntSize {
         }
     }
 
-    public int getArea() {
-        return width * height;
-    }
-
     public boolean equals(IntSize size) {
         return ((size.width == width) && (size.height == height));
     }
 
-    public boolean isPositive() {
-        return (width > 0 && height > 0);
-    }
-
     @Override
     public String toString() { return "(" + width + "," + height + ")"; }
 
@@ -81,23 +73,5 @@ public class IntSize {
         return new IntSize((int)Math.round(width * factor),
                            (int)Math.round(height * factor));
     }
-
-    /* Returns the power of two that is greater than or equal to value */
-    public static int nextPowerOfTwo(int value) {
-        // code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html
-        if (0 == value--) {
-            return 1;
-        }
-        value = (value >> 1) | value;
-        value = (value >> 2) | value;
-        value = (value >> 4) | value;
-        value = (value >> 8) | value;
-        value = (value >> 16) | value;
-        return value + 1;
-    }
-
-    public IntSize nextPowerOfTwo() {
-        return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height));
-    }
 }
 
diff --git a/mobile/android/base/gfx/Layer.java b/mobile/android/base/gfx/Layer.java
index 9e8439845ff..e7e9ac637e8 100644
--- a/mobile/android/base/gfx/Layer.java
+++ b/mobile/android/base/gfx/Layer.java
@@ -80,9 +80,6 @@ public abstract class Layer {
     /** Subclasses override this function to draw the layer. */
     public abstract void draw(RenderContext context);
 
-    /** Subclasses override this function to provide access to the size of the layer. */
-    public abstract IntSize getSize();
-
     /** Given the intrinsic size of the layer, returns the pixel boundaries of the layer rect. */
     protected RectF getBounds(RenderContext context, FloatSize size) {
         float scaleFactor = context.zoomFactor / mResolution;
@@ -171,6 +168,20 @@ public abstract class Layer {
         }
     }
 
+    /* Returns the power of two that is greater than or equal to value */
+    protected static int nextPowerOfTwo(int value) {
+        // code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html
+        if (0 == value--) {
+            return 1;
+        }
+        value = (value >> 1) | value;
+        value = (value >> 2) | value;
+        value = (value >> 4) | value;
+        value = (value >> 8) | value;
+        value = (value >> 16) | value;
+        return value + 1;
+    }
+
     public static class RenderContext {
         public final RectF viewport;
         public final FloatSize pageSize;
diff --git a/mobile/android/base/gfx/LayerController.java b/mobile/android/base/gfx/LayerController.java
index 4ba4e95b2ee..3992212c861 100644
--- a/mobile/android/base/gfx/LayerController.java
+++ b/mobile/android/base/gfx/LayerController.java
@@ -85,11 +85,9 @@ public class LayerController {
 
     private boolean mForceRedraw;
 
-    /* The extra area on the sides of the page that we want to buffer to help with
-     * smooth, asynchronous scrolling. Depending on a device's support for NPOT
-     * textures, this may be rounded up to the nearest power of two.
-     */
-    public static final IntSize MIN_BUFFER = new IntSize(512, 1024);
+    /* NB: These must be powers of two due to the OpenGL ES 1.x restriction on NPOT textures. */
+    public static final int TILE_WIDTH = 1024;
+    public static final int TILE_HEIGHT = 2048;
 
     /* If the visible rect is within the danger zone (measured in pixels from each edge of a tile),
      * we start aggressively redrawing to minimize checkerboarding. */
@@ -295,12 +293,8 @@ public class LayerController {
     }
 
     private RectF getTileRect() {
-        if (mRootLayer == null)
-            return new RectF();
-
         float x = mRootLayer.getOrigin().x, y = mRootLayer.getOrigin().y;
-        IntSize layerSize = mRootLayer.getSize();
-        return new RectF(x, y, x + layerSize.width, y + layerSize.height);
+        return new RectF(x, y, x + TILE_WIDTH, y + TILE_HEIGHT);
     }
 
     public RectF restrictToPageSize(RectF aRect) {
diff --git a/mobile/android/base/gfx/LayerRenderer.java b/mobile/android/base/gfx/LayerRenderer.java
index 4454febe094..442be1d5973 100644
--- a/mobile/android/base/gfx/LayerRenderer.java
+++ b/mobile/android/base/gfx/LayerRenderer.java
@@ -90,7 +90,6 @@ public class LayerRenderer implements GLSurfaceView.Renderer {
     private final ScrollbarLayer mVertScrollLayer;
     private final FadeRunnable mFadeRunnable;
     private RenderContext mLastPageContext;
-    private int mMaxTextureSize;
 
     // Dropped frames display
     private int[] mFrameTimings;
@@ -123,17 +122,12 @@ public class LayerRenderer implements GLSurfaceView.Renderer {
     public void onSurfaceCreated(GL10 gl, EGLConfig config) {
         checkFrameRateMonitorEnabled();
 
+        gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        gl.glClearDepthf(1.0f);             /* FIXME: Is this needed? */
         gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
+        gl.glShadeModel(GL10.GL_SMOOTH);    /* FIXME: Is this needed? */
         gl.glDisable(GL10.GL_DITHER);
         gl.glEnable(GL10.GL_TEXTURE_2D);
-
-        int maxTextureSizeResult[] = new int[1];
-        gl.glGetIntegerv(GL10.GL_MAX_TEXTURE_SIZE, maxTextureSizeResult, 0);
-        mMaxTextureSize = maxTextureSizeResult[0];
-    }
-
-    public int getMaxTextureSize() {
-        return mMaxTextureSize;
     }
 
     /**
diff --git a/mobile/android/base/gfx/LayerView.java b/mobile/android/base/gfx/LayerView.java
index 5a62fa61efb..7a92323eb6b 100644
--- a/mobile/android/base/gfx/LayerView.java
+++ b/mobile/android/base/gfx/LayerView.java
@@ -167,9 +167,5 @@ public class LayerView extends GLSurfaceView {
             return System.nanoTime() - mRenderTime;
         }
     }
-
-    public int getMaxTextureSize() {
-        return mRenderer.getMaxTextureSize();
-    }
 }
 
diff --git a/mobile/android/base/gfx/ScrollbarLayer.java b/mobile/android/base/gfx/ScrollbarLayer.java
index ad30995db7f..426089678c5 100644
--- a/mobile/android/base/gfx/ScrollbarLayer.java
+++ b/mobile/android/base/gfx/ScrollbarLayer.java
@@ -82,8 +82,7 @@ public class ScrollbarLayer extends TileLayer {
         mVertical = vertical;
         mBuffer = buffer;
 
-        IntSize size = image.getSize();
-        mBitmap = Bitmap.createBitmap(size.width, size.height, Bitmap.Config.ARGB_8888);
+        mBitmap = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Bitmap.Config.ARGB_8888);
         mCanvas = new Canvas(mBitmap);
     }
 
@@ -101,7 +100,7 @@ public class ScrollbarLayer extends TileLayer {
     public static ScrollbarLayer create(boolean vertical) {
         // just create an empty image for now, it will get drawn
         // on demand anyway
-        int imageSize = IntSize.nextPowerOfTwo(BAR_SIZE);
+        int imageSize = nextPowerOfTwo(BAR_SIZE);
         ByteBuffer buffer = GeckoAppShell.allocateDirectBuffer(imageSize * imageSize * 4);
         CairoImage image = new BufferedCairoImage(buffer, imageSize, imageSize, CairoImage.FORMAT_ARGB32);
         return new ScrollbarLayer(image, vertical, buffer);
diff --git a/mobile/android/base/gfx/TileLayer.java b/mobile/android/base/gfx/TileLayer.java
index 7905f49a392..5d8cbdc6728 100644
--- a/mobile/android/base/gfx/TileLayer.java
+++ b/mobile/android/base/gfx/TileLayer.java
@@ -39,7 +39,6 @@ package org.mozilla.gecko.gfx;
 
 import android.graphics.Rect;
 import android.graphics.RectF;
-import android.opengl.GLES20;
 import android.util.Log;
 import javax.microedition.khronos.opengles.GL10;
 import javax.microedition.khronos.opengles.GL11Ext;
@@ -59,18 +58,27 @@ public abstract class TileLayer extends Layer {
     private final ArrayList<Rect> mDirtyRects;
     private final CairoImage mImage;
     private final boolean mRepeat;
-    private IntSize mSize;
+    private final IntSize mSize;
     private int[] mTextureIDs;
 
     public TileLayer(boolean repeat, CairoImage image) {
         mRepeat = repeat;
         mImage = image;
-        mSize = new IntSize(0, 0);
+        mSize = new IntSize(image.getWidth(), image.getHeight());
         mDirtyRects = new ArrayList<Rect>();
+
+        /*
+         * Assert that the image has a power-of-two size. OpenGL ES < 2.0 doesn't support NPOT
+         * textures and OpenGL ES doesn't seem to let us efficiently slice up a NPOT bitmap.
+         */
+        int width = mImage.getWidth(), height = mImage.getHeight();
+        if ((width & (width - 1)) != 0 || (height & (height - 1)) != 0) {
+            throw new RuntimeException("TileLayer: NPOT images are unsupported (dimensions are " +
+                                       width + "x" + height + ")");
+        }
     }
 
-    @Override
-    public IntSize getSize() { return mImage.getSize(); }
+    public IntSize getSize() { return mSize; }
 
     protected boolean repeats() { return mRepeat; }
     protected int getTextureID() { return mTextureIDs[0]; }
@@ -93,49 +101,13 @@ public abstract class TileLayer extends Layer {
     }
 
     public void invalidate() {
-        IntSize bufferSize = mImage.getSize();
-        invalidate(new Rect(0, 0, bufferSize.width, bufferSize.height));
-    }
-
-    private void validateTexture() {
-        /* Calculate the ideal texture size. This must be a power of two if
-         * the texture is repeated or OpenGL ES 2.0 isn't supported, as
-         * OpenGL ES 2.0 is required for NPOT texture support (without
-         * extensions), but doesn't support repeating NPOT textures.
-         *
-         * XXX Currently, we don't pick a GLES 2.0 context, so always round.
-         */
-        IntSize bufferSize = mImage.getSize();
-        IntSize textureSize = bufferSize;
-
-        textureSize = bufferSize.nextPowerOfTwo();
-
-        if (!textureSize.equals(mSize)) {
-            mSize = textureSize;
-
-            // Delete the old texture
-            if (mTextureIDs != null) {
-                TextureReaper.get().add(mTextureIDs);
-                mTextureIDs = null;
-
-                // XXX This won't be freed until the next frame is drawn, so we
-                //     temporarily have a larger-than-necessary memory requirement.
-                //     Is this what we want?
-            }
-        }
+        invalidate(new Rect(0, 0, mSize.width, mSize.height));
     }
 
     @Override
     protected void performUpdates(GL10 gl) {
         super.performUpdates(gl);
 
-        // Reallocate the texture if the size has changed
-        validateTexture();
-
-        // Don't do any work if the image has an invalid size.
-        if (!mImage.getSize().isPositive())
-            return;
-
         if (mTextureIDs == null) {
             uploadFullTexture(gl);
         } else {
@@ -147,58 +119,43 @@ public abstract class TileLayer extends Layer {
     }
 
     private void uploadFullTexture(GL10 gl) {
-        IntSize bufferSize = mImage.getSize();
-        uploadDirtyRect(gl, new Rect(0, 0, bufferSize.width, bufferSize.height));
-    }
- 
-    private void uploadDirtyRect(GL10 gl, Rect dirtyRect) {
-        boolean newlyCreated = false;
-
-        if (mTextureIDs == null) {
-            mTextureIDs = new int[1];
-            gl.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
-            newlyCreated = true;
-        }
-
-        IntSize bufferSize = mImage.getSize();
-        Rect bufferRect = new Rect(0, 0, bufferSize.width, bufferSize.height);
+        mTextureIDs = new int[1];
+        gl.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
 
         int cairoFormat = mImage.getFormat();
         CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
 
         bindAndSetGLParameters(gl);
 
-        if (newlyCreated || dirtyRect.equals(bufferRect)) {
-            if (mSize.equals(bufferSize)) {
-                gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width, mSize.height,
-                                0, glInfo.format, glInfo.type, mImage.getBuffer());
-                return;
-            } else {
-                gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width, mSize.height,
-                                0, glInfo.format, glInfo.type, null);
-                gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, bufferSize.width, bufferSize.height,
-                                   glInfo.format, glInfo.type, mImage.getBuffer());
-                return;
-            }
-        }
+        gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width, mSize.height,
+                        0, glInfo.format, glInfo.type, mImage.getBuffer());
+    }
+
+    private void uploadDirtyRect(GL10 gl, Rect dirtyRect) {
+        if (mTextureIDs == null)
+            throw new RuntimeException("uploadDirtyRect() called with null texture ID!");
+
+        int width = mSize.width;
+        int cairoFormat = mImage.getFormat();
+        CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
+
+        bindAndSetGLParameters(gl);
 
         /*
          * Upload the changed rect. We have to widen to the full width of the texture
          * because we can't count on the device having support for GL_EXT_unpack_subimage,
          * and going line-by-line is too slow.
-         *
-         * XXX We should still use GL_EXT_unpack_subimage when available.
          */
         Buffer viewBuffer = mImage.getBuffer().slice();
         int bpp = CairoUtils.bitsPerPixelForCairoFormat(cairoFormat) / 8;
-        int position = dirtyRect.top * bufferSize.width * bpp;
+        int position = dirtyRect.top * width * bpp;
         if (position > viewBuffer.limit()) {
             Log.e(LOGTAG, "### Position outside tile! " + dirtyRect.top);
             return;
         }
 
         viewBuffer.position(position);
-        gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, dirtyRect.top, bufferSize.width, dirtyRect.height(),
+        gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, dirtyRect.top, width, dirtyRect.height(),
                            glInfo.format, glInfo.type, viewBuffer);
     }
 
diff --git a/mobile/android/base/gfx/ViewportMetrics.java b/mobile/android/base/gfx/ViewportMetrics.java
index 03f99e20048..a9a48ab20b1 100644
--- a/mobile/android/base/gfx/ViewportMetrics.java
+++ b/mobile/android/base/gfx/ViewportMetrics.java
@@ -44,7 +44,6 @@ import android.graphics.Rect;
 import android.graphics.RectF;
 import org.mozilla.gecko.FloatUtils;
 import org.mozilla.gecko.gfx.FloatSize;
-import org.mozilla.gecko.gfx.IntSize;
 import org.mozilla.gecko.gfx.LayerController;
 import org.mozilla.gecko.gfx.RectUtils;
 import org.json.JSONException;
@@ -65,7 +64,8 @@ public class ViewportMetrics {
     private float mZoomFactor;
 
     public ViewportMetrics() {
-        mPageSize = new FloatSize(1, 1);
+        mPageSize = new FloatSize(LayerController.TILE_WIDTH,
+                                  LayerController.TILE_HEIGHT);
         mViewportRect = new RectF(0, 0, 1, 1);
         mViewportOffset = new PointF(0, 0);
         mZoomFactor = 1.0f;
@@ -96,13 +96,13 @@ public class ViewportMetrics {
         mZoomFactor = zoom;
     }
 
-    public PointF getOptimumViewportOffset(IntSize displayportSize) {
+    public PointF getOptimumViewportOffset() {
         // XXX We currently always position the viewport in the centre of the
         //     displayport, but we might want to optimise this during panning
         //     to minimise checkerboarding.
         Point optimumOffset =
-            new Point((int)Math.round((displayportSize.width - mViewportRect.width()) / 2),
-                      (int)Math.round((displayportSize.height - mViewportRect.height()) / 2));
+            new Point((int)Math.round((LayerController.TILE_WIDTH - mViewportRect.width()) / 2),
+                      (int)Math.round((LayerController.TILE_HEIGHT - mViewportRect.height()) / 2));
 
         /* XXX Until bug #524925 is fixed, changing the viewport origin will
          * probably cause things to be slower than just having a smaller usable
diff --git a/widget/src/android/nsWindow.cpp b/widget/src/android/nsWindow.cpp
index 02a4c71d74d..cd3e5814f2d 100644
--- a/widget/src/android/nsWindow.cpp
+++ b/widget/src/android/nsWindow.cpp
@@ -79,6 +79,10 @@ using mozilla::unused;
 
 #include "nsStringGlue.h"
 
+// NB: Keep these in sync with LayerController.java in mobile/android/base and embedding/android/.
+#define TILE_WIDTH      1024
+#define TILE_HEIGHT     2048
+
 using namespace mozilla;
 using namespace mozilla::widget;
 
@@ -306,7 +310,7 @@ nsWindow::ConfigureChildren(const nsTArray<nsIWidget::Configuration>& config)
 void
 nsWindow::RedrawAll()
 {
-    nsIntRect entireRect(0, 0, gAndroidBounds.width, gAndroidBounds.height);
+    nsIntRect entireRect(0, 0, TILE_WIDTH, TILE_HEIGHT);
     AndroidGeckoEvent *event = new AndroidGeckoEvent(AndroidGeckoEvent::DRAW, entireRect);
     nsAppShell::gAppShell->PostEvent(event);
 }
@@ -1014,7 +1018,7 @@ nsWindow::DrawTo(gfxASurface *targetSurface, const nsIntRect &invalidRect)
     if (coveringChildIndex == -1) {
         nsPaintEvent event(true, NS_PAINT, this);
 
-        nsIntRect tileRect(0, 0, gAndroidBounds.width, gAndroidBounds.height);
+        nsIntRect tileRect(0, 0, TILE_WIDTH, TILE_HEIGHT);
         event.region = boundsRect.Intersect(invalidRect).Intersect(tileRect);
 
         switch (GetLayerManager(nsnull)->GetBackendType()) {
@@ -1108,7 +1112,7 @@ nsWindow::OnDraw(AndroidGeckoEvent *ae)
 
     unsigned char *bits = client.LockBufferBits();
     nsRefPtr<gfxImageSurface> targetSurface =
-        new gfxImageSurface(bits, gfxIntSize(gAndroidBounds.width, gAndroidBounds.height), gAndroidBounds.width * 2,
+        new gfxImageSurface(bits, gfxIntSize(TILE_WIDTH, TILE_HEIGHT), TILE_WIDTH * 2,
                             gfxASurface::ImageFormatRGB16_565);
     if (targetSurface->CairoStatus()) {
         ALOG("### Failed to create a valid surface from the bitmap");