Distorted Android

        minSdkVersion 18

        <activity android:name=".plainmonalisa.PlainMonaLisaActivity" />  

import org.distorted.examples.plainmonalisa.PlainMonaLisaActivity;

   {

      final Map<String, Object> item = new HashMap<String, Object>();

      item.put(ITEM_IMAGE, R.drawable.icon_example_monalisa);

      item.put(ITEM_TITLE, (i+1)+". "+getText(R.string.example_plainmonalisa));

      item.put(ITEM_SUBTITLE, getText(R.string.example_plainmonalisa_subtitle));

      data.add(item);

      activityMapping.put(i++, PlainMonaLisaActivity.class);

   }

package org.distorted.examples.plainmonalisa;

import android.graphics.SurfaceTexture;

import android.opengl.EGL14;

import android.opengl.EGLConfig;

import android.opengl.EGLContext;

import android.opengl.EGLDisplay;

import android.opengl.EGLExt;

import android.opengl.EGLSurface;

import android.util.Log;

import android.view.Surface;

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Core EGL state (display, context, config).

 * <p>

 * The EGLContext must only be attached to one thread at a time.  This class is not thread-safe.

 */

public final class EglCore

  {

  private static final String TAG = "EglCore";

  /**

   * Constructor flag: surface must be recordable.  This discourages EGL from using a

   * pixel format that cannot be converted efficiently to something usable by the video

   * encoder.

   */

  public static final int FLAG_RECORDABLE = 0x01;

  /**

   * Constructor flag: ask for GLES3, fall back to GLES2 if not available.  Without this

   * flag, GLES2 is used.

   */

  public static final int FLAG_TRY_GLES3 = 0x02;

  // Android-specific extension.

  private static final int EGL_RECORDABLE_ANDROID = 0x3142;

  private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;

  private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;

  private EGLConfig mEGLConfig = null;

  private int mGlVersion = -1;

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Prepares EGL display and context.

   * <p>

   * Equivalent to EglCore(null, 0).

   */

  public EglCore() {

        this(null, 0);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Prepares EGL display and context.

   * <p>

   * @param sharedContext The context to share, or null if sharing is not desired.

   * @param flags Configuration bit flags, e.g. FLAG_RECORDABLE.

   */

  public EglCore(EGLContext sharedContext, int flags)

    {

    if (mEGLDisplay != EGL14.EGL_NO_DISPLAY)

      {

      throw new RuntimeException("EGL already set up");

      }

    if (sharedContext == null)

      {

      sharedContext = EGL14.EGL_NO_CONTEXT;

      }

    mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);

    if (mEGLDisplay == EGL14.EGL_NO_DISPLAY)

      {

      throw new RuntimeException("unable to get EGL14 display");

      }

    int[] version = new int[2];

    if (!EGL14.eglInitialize(mEGLDisplay, version, 0, version, 1))

      {

      mEGLDisplay = null;

      throw new RuntimeException("unable to initialize EGL14");

      }

    // Try to get a GLES3 context, if requested.

    if ((flags & FLAG_TRY_GLES3) != 0)

      {

      //Log.d(TAG, "Trying GLES 3");

      EGLConfig config = getConfig(flags, 3);

      if (config != null)

        {

        int[] attrib3_list =  { EGL14.EGL_CONTEXT_CLIENT_VERSION, 3, EGL14.EGL_NONE };

        EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext, attrib3_list, 0);

        if (EGL14.eglGetError() == EGL14.EGL_SUCCESS)

          {

          //Log.d(TAG, "Got GLES 3 config");

          mEGLConfig = config;

          mEGLContext = context;

          mGlVersion = 3;

          }

        }

      }

    if (mEGLContext == EGL14.EGL_NO_CONTEXT)

      {  // GLES 2 only, or GLES 3 attempt failed

         //Log.d(TAG, "Trying GLES 2");

      EGLConfig config = getConfig(flags, 2);

      if (config == null)

        {

        throw new RuntimeException("Unable to find a suitable EGLConfig");

        }

      int[] attrib2_list = { EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE };

      EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext, attrib2_list, 0);

      checkEglError("eglCreateContext");

      mEGLConfig = config;

      mEGLContext = context;

      mGlVersion = 2;

      }

    // Confirm with query.

    int[] values = new int[1];

    EGL14.eglQueryContext(mEGLDisplay, mEGLContext, EGL14.EGL_CONTEXT_CLIENT_VERSION, values, 0);

    Log.d(TAG, "EGLContext created, client version " + values[0]);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Finds a suitable EGLConfig.

   *

   * @param flags Bit flags from constructor.

   * @param version Must be 2 or 3.

   */

  private EGLConfig getConfig(int flags, int version)

    {

    int renderableType = EGL14.EGL_OPENGL_ES2_BIT;

    if (version >= 3)

      {

      renderableType |= EGLExt.EGL_OPENGL_ES3_BIT_KHR;

      }

    // The actual surface is generally RGBA or RGBX, so situationally omitting alpha

    // doesn't really help.  It can also lead to a huge performance hit on glReadPixels()

    // when reading into a GL_RGBA buffer.

    int[] attribList =

                {

                EGL14.EGL_RED_SIZE, 8,

                EGL14.EGL_GREEN_SIZE, 8,

                EGL14.EGL_BLUE_SIZE, 8,

                EGL14.EGL_ALPHA_SIZE, 8,

                //EGL14.EGL_DEPTH_SIZE, 16,

                //EGL14.EGL_STENCIL_SIZE, 8,

                EGL14.EGL_RENDERABLE_TYPE, renderableType,

                EGL14.EGL_NONE, 0,      // placeholder for recordable [@-3]

                EGL14.EGL_NONE

                };

    if ((flags & FLAG_RECORDABLE) != 0)

      {

      attribList[attribList.length - 3] = EGL_RECORDABLE_ANDROID;

      attribList[attribList.length - 2] = 1;

      }

    EGLConfig[] configs = new EGLConfig[1];

    int[] numConfigs = new int[1];

    if (!EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0, configs.length, numConfigs, 0))

      {

      Log.w(TAG, "unable to find RGB8888 / " + version + " EGLConfig");

      return null;

      }

    return configs[0];

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Discards all resources held by this class, notably the EGL context.  This must be

   * called from the thread where the context was created.

   * <p>

   * On completion, no context will be current.

   */

  public void release()

    {

    if (mEGLDisplay != EGL14.EGL_NO_DISPLAY)

      {

      // Android is unusual in that it uses a reference-counted EGLDisplay.  So for

      // every eglInitialize() we need an eglTerminate().

      EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);

      EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);

      EGL14.eglReleaseThread();

      EGL14.eglTerminate(mEGLDisplay);

      }

    mEGLDisplay = EGL14.EGL_NO_DISPLAY;

    mEGLContext = EGL14.EGL_NO_CONTEXT;

    mEGLConfig = null;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @Override

  protected void finalize() throws Throwable

    {

    try

      {

      if (mEGLDisplay != EGL14.EGL_NO_DISPLAY)

        {

        // We're limited here -- finalizers don't run on the thread that holds

        // the EGL state, so if a surface or context is still current on another

        // thread we can't fully release it here.  Exceptions thrown from here

        // are quietly discarded.  Complain in the log file.

        Log.w(TAG, "WARNING: EglCore was not explicitly released -- state may be leaked");

        release();

        }

      }

    finally

      {

      super.finalize();

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Destroys the specified surface.  Note the EGLSurface won't actually be destroyed if it's

   * still current in a context.

   */

  public void releaseSurface(EGLSurface eglSurface)

    {

    EGL14.eglDestroySurface(mEGLDisplay, eglSurface);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Creates an EGL surface associated with a Surface.

   * <p>

   * If this is destined for MediaCodec, the EGLConfig should have the "recordable" attribute.

   */

  public EGLSurface createWindowSurface(Object surface)

    {

    if (!(surface instanceof Surface) && !(surface instanceof SurfaceTexture))

      {

      throw new RuntimeException("invalid surface: " + surface);

      }

    // Create a window surface, and attach it to the Surface we received.

    int[] surfaceAttribs = { EGL14.EGL_NONE };

    EGLSurface eglSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, surface, surfaceAttribs, 0);

    checkEglError("eglCreateWindowSurface");

    if (eglSurface == null)

      {

      throw new RuntimeException("surface was null");

      }

    return eglSurface;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Makes our EGL context current, using the supplied surface for both "draw" and "read".

   */

  public void makeCurrent(EGLSurface eglSurface)

    {

    if (mEGLDisplay == EGL14.EGL_NO_DISPLAY)

      {

      // called makeCurrent() before create?

      Log.d(TAG, "NOTE: makeCurrent w/o display");

      }

    if (!EGL14.eglMakeCurrent(mEGLDisplay, eglSurface, eglSurface, mEGLContext))

      {

      throw new RuntimeException("eglMakeCurrent failed");

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Makes no context current.

   */

  public void makeNothingCurrent()

    {

    if (!EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT))

      {

      throw new RuntimeException("eglMakeCurrent failed");

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Returns the GLES version this context is configured for (currently 2 or 3).

   */

  public int getGlVersion()

    {

    return mGlVersion;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Calls eglSwapBuffers.  Use this to "publish" the current frame.

   *

   * @return false on failure

   */

  public boolean swapBuffers(EGLSurface eglSurface)

    {

    return EGL14.eglSwapBuffers(mEGLDisplay, eglSurface);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Checks for EGL errors.  Throws an exception if an error has been raised.

   */

  private void checkEglError(String msg)

    {

    int error;

    if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS)

      {

      throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));

      }

    }

  }

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.examples.plainmonalisa;

import org.distorted.library.Distorted;

import android.app.Activity;

import android.os.Bundle;

///////////////////////////////////////////////////////////////////////////////////////////////////

public class PlainMonaLisaActivity extends Activity

{

    private PlainMonaLisaSurfaceView mView;

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onCreate(Bundle icicle) 

      {

      super.onCreate(icicle);

      mView = new PlainMonaLisaSurfaceView(this);

      setContentView(mView);

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onPause() 

      {

      mView.onPause();

      super.onPause();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onResume() 

      {

      super.onResume();

      mView.onResume();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onDestroy() 

      {

      Distorted.onDestroy();  

      super.onDestroy();

      }

}

package org.distorted.examples.plainmonalisa;

import android.content.Context;

import android.view.Choreographer;

import android.view.SurfaceView;

import android.view.SurfaceHolder;

import android.util.Log;

///////////////////////////////////////////////////////////////////////////////////////////////////

class PlainMonaLisaSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Choreographer.FrameCallback

  {

  private static final String TAG = "MonaLisaSurface";

  private RenderThread mRenderThread;

///////////////////////////////////////////////////////////////////////////////////////////////////

  public PlainMonaLisaSurfaceView(Context context)

    {

    super(context);

    getHolder().addCallback(this);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void surfaceCreated(SurfaceHolder holder)

    {

    Log.d(TAG, "surfaceCreated holder=" + holder);

    mRenderThread = new RenderThread(holder, this);

    mRenderThread.setName("GL render");

    mRenderThread.start();

    mRenderThread.waitUntilReady();

    RenderHandler rh = mRenderThread.getHandler();

    if (rh != null)

      {

      rh.sendSurfaceCreated();

      }

    Choreographer.getInstance().postFrameCallback(this);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)

    {

    Log.d(TAG, "surfaceChanged fmt=" + format + " size=" + width + "x" + height +" holder=" + holder);

    RenderHandler rh = mRenderThread.getHandler();

    if (rh != null)

      {

      rh.sendSurfaceChanged(format, width, height);

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void surfaceDestroyed(SurfaceHolder holder)

    {

    Log.d(TAG, "surfaceDestroyed holder=" + holder);

    // We need to wait for the render thread to shut down before continuing because we

    // don't want the Surface to disappear out from under it mid-render.  The frame

    // notifications will have been stopped back in onPause(), but there might have

    // been one in progress.

    RenderHandler rh = mRenderThread.getHandler();

    if (rh != null)

      {

      rh.sendShutdown();

      try

        {

        mRenderThread.join();

        }

      catch (InterruptedException ie)

        {

        throw new RuntimeException("join was interrupted", ie);

        }

      }

    mRenderThread = null;

    Log.d(TAG, "surfaceDestroyed complete");

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void onPause()

    {

    Log.d(TAG, "onPause unhooking choreographer");

    Choreographer.getInstance().removeFrameCallback(this);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void onResume()

    {

    if (mRenderThread != null)

      {

      Log.d(TAG, "onResume re-hooking choreographer");

      Choreographer.getInstance().postFrameCallback(this);

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @Override

  public void doFrame(long frameTimeNanos)

    {

    RenderHandler rh = mRenderThread.getHandler();

    if (rh != null)

      {

      Choreographer.getInstance().postFrameCallback(this);

      rh.sendDoFrame(frameTimeNanos);

      }

    }

  }

package org.distorted.examples.plainmonalisa;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import java.lang.ref.WeakReference;

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Handler for RenderThread.  Used for messages sent from the UI thread to the render thread.

 * <p>

 * The object is created on the render thread, and the various "send" methods are called

 * from the UI thread.

 */

public class RenderHandler extends Handler

  {

  private static final String TAG = "RenderHandler";

  private static final int MSG_SURFACE_CREATED = 0;

  private static final int MSG_SURFACE_CHANGED = 1;

  private static final int MSG_DO_FRAME = 2;

  private static final int MSG_SHUTDOWN = 4;

  // This shouldn't need to be a weak ref, since we'll go away when the Looper quits,

  // but no real harm in it.

  private WeakReference<RenderThread> mWeakRenderThread;

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Call from render thread.

   */

  public RenderHandler(RenderThread rt)

      {

      mWeakRenderThread = new WeakReference<>(rt);

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Sends the "surface created" message.

   * <p>

   * Call from UI thread.

   */

  public void sendSurfaceCreated()

    {

    sendMessage(obtainMessage(RenderHandler.MSG_SURFACE_CREATED));

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Sends the "surface changed" message, forwarding what we got from the SurfaceHolder.

   * <p>

   * Call from UI thread.

   */

  public void sendSurfaceChanged(@SuppressWarnings("unused") int format, int width, int height)

    {

    sendMessage(obtainMessage(RenderHandler.MSG_SURFACE_CHANGED, width, height));

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Sends the "do frame" message, forwarding the Choreographer event.

   * <p>

   * Call from UI thread.

   */

  public void sendDoFrame(long frameTimeNanos)

    {

    sendMessage(obtainMessage(RenderHandler.MSG_DO_FRAME, (int) (frameTimeNanos >> 32), (int) frameTimeNanos));

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Sends the "shutdown" message, which tells the render thread to halt.

   * <p>

   * Call from UI thread.

   */

  public void sendShutdown()

      {

      sendMessage(obtainMessage(RenderHandler.MSG_SHUTDOWN));

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @Override  // runs on RenderThread

  public void handleMessage(Message msg)

    {

    int what = msg.what;

    //Log.d(TAG, "RenderHandler [" + this + "]: what=" + what);

    RenderThread renderThread = mWeakRenderThread.get();

    if (renderThread == null)

      {

      Log.w(TAG, "RenderHandler.handleMessage: weak ref is null");

      return;

      }

    switch (what)

      {

      case MSG_SURFACE_CREATED: renderThread.surfaceCreated();

                                break;

      case MSG_SURFACE_CHANGED: renderThread.surfaceChanged(msg.arg1, msg.arg2);

                                break;

      case MSG_DO_FRAME:        long timestamp = (((long) msg.arg1) << 32) | (((long) msg.arg2) & 0xffffffffL);

                                renderThread.doFrame(timestamp);

                                break;

      case MSG_SHUTDOWN:        renderThread.shutdown();

                                break;

      default:                  throw new RuntimeException("unknown message " + what);

      }

    }

  }

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.examples.plainmonalisa;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.opengl.EGL14;

import android.opengl.EGLSurface;

import android.opengl.GLES20;

import android.os.Looper;

import android.os.Trace;

import android.util.Log;

import android.view.Surface;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import org.distorted.library.Distorted;

import org.distorted.library.DistortedBitmap;

import org.distorted.library.Float2D;

import org.distorted.library.Float3D;

import org.distorted.library.Float4D;

import org.distorted.examples.R;

import java.io.IOException;

import java.io.InputStream;

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * This class handles all OpenGL rendering.

 * <p>

 * Start the render thread after the Surface has been created.

 */

public class RenderThread extends Thread

  {

  private static final String TAG = "RenderThread";

  // Object must be created on render thread to get correct Looper, but is used from

  // UI thread, so we need to declare it volatile to ensure the UI thread sees a fully

  // constructed object.

  private volatile RenderHandler mHandler;

  // Used to wait for the thread to start.

  private Object mStartLock = new Object();

  private boolean mReady = false;

  private volatile SurfaceHolder mSurfaceHolder;  // may be updated by UI thread

  private EglCore eglCore;

  private EGLSurface eglSurface;

  private DistortedBitmap monaLisa;

  private int bmpHeight, bmpWidth;

  private Float2D pLeft, pRight;

  private Float4D rLeft, rRight;

  private Float3D vLeft, vRight;

  SurfaceView mView;

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Pass in the SurfaceView's SurfaceHolder.  Note the Surface may not yet exist.

   */

  public RenderThread(SurfaceHolder holder, SurfaceView view)

    {

    mSurfaceHolder = holder;

    mView = view;

    pLeft = new Float2D( 90, 258);

    pRight= new Float2D(176, 255);

    rLeft = new Float4D(-10,-10,25,25);

    rRight= new Float4D( 10, -5,25,25);

    vLeft = new Float3D(-20,-20,0);

    vRight= new Float3D( 20,-10,0);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Thread entry point.

   * <p>

   * The thread should not be started until the Surface associated with the SurfaceHolder

   * has been created.  That way we don't have to wait for a separate "surface created"

   * message to arrive.

   */

  @Override

  public void run()

    {

    Looper.prepare();

    mHandler = new RenderHandler(this);

    eglCore = new EglCore(null, EglCore.FLAG_RECORDABLE | EglCore.FLAG_TRY_GLES3);

    synchronized (mStartLock)

      {

      mReady = true;

      mStartLock.notify();    // signal waitUntilReady()

      }

    Looper.loop();

    Log.d(TAG, "looper quit");

    checkGlError("releaseGl start");

    if (eglSurface != null)

      {

      eglCore.releaseSurface(eglSurface);

      eglSurface = EGL14.EGL_NO_SURFACE;

      }

    checkGlError("releaseGl done");

    eglCore.makeNothingCurrent();

    eglCore.release();

    synchronized (mStartLock)

      {

      mReady = false;

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Waits until the render thread is ready to receive messages.

   * <p>

   * Call from the UI thread.

   */

  public void waitUntilReady()

    {

    synchronized (mStartLock)

      {

      while (!mReady)

        {

        try

          {

          mStartLock.wait();

          }

        catch (InterruptedException ie) { /* not expected */ }

        }

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Shuts everything down.

   */

  void shutdown()

    {

    Log.d(TAG, "shutdown");

    Looper.myLooper().quit();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Returns the render thread's Handler.  This may be called from any thread.

   */

  public RenderHandler getHandler()

      {

      return mHandler;

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

  /**

   * Prepares the surface.

   */

  void surfaceCreated()

    {

    Surface surface = mSurfaceHolder.getSurface();

    eglSurface = eglCore.createWindowSurface(surface);

    eglCore.makeCurrent(eglSurface);

    InputStream is = mView.getContext().getResources().openRawResource(R.raw.monalisa);

    Bitmap bmp;

    try

      {

      bmp = BitmapFactory.decodeStream(is);

      }

    finally

      {

      try

        {

        is.close();

        }

      catch(IOException io) {}

      }

    monaLisa = new DistortedBitmap(bmp, 10);

    monaLisa.distort( vLeft, rLeft , pLeft, 1000, 0);

    monaLisa.distort(vRight, rRight, pRight,1000, 0);

    bmpHeight = bmp.getHeight();

    bmpWidth  = bmp.getWidth();

    try

      {

      Distorted.onSurfaceCreated(mView.getContext());

      }

    catch(Exception ex)

      {

      Log.e("MonaLisa", ex.getMessage() );

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  void surfaceChanged(int width, int height)

    {

    Log.d(TAG, "surfaceChanged " + width + "x" + height);

    monaLisa.abortAllEffects(Distorted.TYPE_MATR);

    if( bmpHeight/bmpWidth > height/width )

      {

      int w = (height*bmpWidth)/bmpHeight;

      monaLisa.move((width-w)/2 ,0, 0);

      monaLisa.scale((float)height/bmpHeight);

      }

    else

      {

      int h = (width*bmpHeight)/bmpWidth;

      monaLisa.move(0 ,(height-h)/2, 0);

      monaLisa.scale((float)width/bmpWidth);

      }

    Distorted.onSurfaceChanged(width, height);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void doFrame(long frameTimeNs)

    {

    Trace.beginSection("doFrame draw");

    eglCore.makeCurrent(eglSurface);

    GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

    GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);

    monaLisa.draw(System.currentTimeMillis());

    eglCore.swapBuffers(eglSurface);

    Trace.endSection();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public static void checkGlError(String op)

    {

    int error = GLES20.glGetError();

    if (error != GLES20.GL_NO_ERROR)

      {

      String msg = op + ": glError 0x" + Integer.toHexString(error);

      Log.e(TAG, msg);

      throw new RuntimeException(msg);

      }

    }

  }

///////////////////////////////////////////////////////////////////////////////////////////////////

    <string name="example_plainmonalisa">PlainMonaLisa</string>  

    <string name="example_plainmonalisa_subtitle">MonaLisa rendered on a plain SurfaceView</string>