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modification, are permitted provided that the following conditions are
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    * Redistributions of source code must retain the above copyright
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      copyright notice, this list of conditions and the following
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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 */

package com.android.camera.imageprocessor;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.media.Image;
import android.media.ImageReader;
import android.os.Handler;
import android.os.HandlerThread;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicYuvToRGB;
import android.renderscript.Type;
import android.util.Log;
import android.util.Size;
import android.view.Surface;

import com.android.camera.CaptureModule;
import com.android.camera.PhotoModule;
import com.android.camera.imageprocessor.filter.BeautificationFilter;
import com.android.camera.imageprocessor.filter.ImageFilter;
import com.android.camera.util.CameraUtil;

import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;

public class FrameProcessor {

    private ImageReader mInputImageReader;
    private Allocation mInputAllocation;
    private Allocation mProcessAllocation;
    private Allocation mOutputAllocation;

    private HandlerThread mProcessingThread;
    private Handler mProcessingHandler;
    private HandlerThread mOutingThread;
    private Handler mOutingHandler;

    public ProcessingTask mTask;
    private RenderScript mRs;
    private Activity mActivity;
    ScriptC_YuvToRgb mRsYuvToRGB;
    ScriptC_rotator mRsRotator;
    private Size mSize;
    private Object mAllocationLock = new Object();
    private boolean mIsAllocationEverUsed;
    private ArrayList<ImageFilter> mPreviewFilters;
    private ArrayList<ImageFilter> mFinalFilters;
    private Surface mSurfaceAsItIs;
    private boolean mIsActive = false;
    public static final int FILTER_NONE = 0;
    public static final int FILTER_MAKEUP = 1;
    private CaptureModule mModule;

    public FrameProcessor(Activity activity, CaptureModule module) {
        mActivity = activity;
        mModule = module;
        mPreviewFilters = new ArrayList<ImageFilter>();
        mFinalFilters = new ArrayList<ImageFilter>();
    }

    public void init(Size previewDim) {
        mSize = previewDim;
        synchronized (mAllocationLock) {
            mRs = RenderScript.create(mActivity);
            mRsYuvToRGB = new ScriptC_YuvToRgb(mRs);
            mRsRotator = new ScriptC_rotator(mRs);
            mInputImageReader = ImageReader.newInstance(mSize.getWidth(), mSize.getHeight(), ImageFormat.YUV_420_888, 8);

            Type.Builder rgbTypeBuilder = new Type.Builder(mRs, Element.RGBA_8888(mRs));
            rgbTypeBuilder.setX(mSize.getHeight());
            rgbTypeBuilder.setY(mSize.getWidth());
            mOutputAllocation = Allocation.createTyped(mRs, rgbTypeBuilder.create(),
                    Allocation.USAGE_SCRIPT | Allocation.USAGE_IO_OUTPUT);

            if (mProcessingThread == null) {
                mProcessingThread = new HandlerThread("FrameProcessor");
                mProcessingThread.start();
                mProcessingHandler = new Handler(mProcessingThread.getLooper());
            }

            if (mOutingThread == null) {
                mOutingThread = new HandlerThread("FrameOutingThread");
                mOutingThread.start();
                mOutingHandler = new Handler(mOutingThread.getLooper());
            }

            mTask = new ProcessingTask();
            mInputImageReader.setOnImageAvailableListener(mTask, mProcessingHandler);
            mIsAllocationEverUsed = false;
        }
    }

    private void createAllocation(int width, int height, int stridePad) {
        Type.Builder yuvTypeBuilder = new Type.Builder(mRs, Element.YUV(mRs));
        yuvTypeBuilder.setX(width);
        yuvTypeBuilder.setY(height);
        yuvTypeBuilder.setYuvFormat(ImageFormat.NV21);
        mInputAllocation = Allocation.createTyped(mRs, yuvTypeBuilder.create(), Allocation.USAGE_SCRIPT);
        Type.Builder nv21TypeBuilder = new Type.Builder(mRs, Element.U8(mRs));
        nv21TypeBuilder.setX(width * height * 3 / 2);
        mProcessAllocation = Allocation.createTyped(mRs, nv21TypeBuilder.create(), Allocation.USAGE_SCRIPT);
        mRsRotator.set_gIn(mInputAllocation);
        mRsRotator.set_gOut(mProcessAllocation);
        mRsRotator.set_width(width);
        mRsRotator.set_height(height);
        mRsRotator.set_pad(stridePad);
        mRsRotator.set_gFlip(!mModule.isBackCamera());
        mRsYuvToRGB.set_gIn(mProcessAllocation);
        mRsYuvToRGB.set_width(height);
        mRsYuvToRGB.set_height(width);
    }

    public ArrayList<ImageFilter> getFrameFilters() {
        return mFinalFilters;
    }

    private void cleanFilterSet() {
        if(mPreviewFilters != null) {
            for (ImageFilter filter : mPreviewFilters) {
                filter.deinit();
            }
        }
        if(mFinalFilters != null) {
            for (ImageFilter filter : mFinalFilters) {
                filter.deinit();
            }
        }
        mPreviewFilters = new ArrayList<ImageFilter>();
        mFinalFilters = new ArrayList<ImageFilter>();
    }

    public void onOpen(ArrayList<Integer> filterIds) {
        mIsActive = true;
        synchronized (mAllocationLock) {
            cleanFilterSet();
            if (filterIds != null) {
                for (Integer i : filterIds) {
                    addFilter(i.intValue());
                }
            }
        }
    }

    private void addFilter(int filterId) {
        if(filterId == FILTER_MAKEUP) {
            ImageFilter filter = new BeautificationFilter(mModule);
            if(filter.isSupported()) {
                mPreviewFilters.add(filter);
                mFinalFilters.add(filter);
            }
        }
    }

    public void onClose() {
        mIsActive = false;
        synchronized (mAllocationLock) {
            if (mIsAllocationEverUsed) {
                if (mInputAllocation != null) {
                    mInputAllocation.destroy();
                }
                if (mOutputAllocation != null) {
                    mOutputAllocation.destroy();
                }
                if (mProcessAllocation != null) {
                    mProcessAllocation.destroy();
                }
            }
            if (mRs != null) {
                mRs.destroy();
            }
            mRs = null;
            mProcessAllocation = null;
            mOutputAllocation = null;
            mInputAllocation = null;
        }
        if (mProcessingThread != null) {
            mProcessingThread.quitSafely();
            try {
                mProcessingThread.join();
                mProcessingThread = null;
                mProcessingHandler = null;
            } catch (InterruptedException e) {
            }
        }
        if (mOutingThread != null) {
            mOutingThread.quitSafely();
            try {
                mOutingThread.join();
                mOutingThread = null;
                mOutingHandler = null;
            } catch (InterruptedException e) {
            }
        }
        for(ImageFilter filter : mPreviewFilters) {
            filter.deinit();
        }
        for(ImageFilter filter : mFinalFilters) {
            filter.deinit();
        }
    }

    public Surface getInputSurface() {
        if(mPreviewFilters.size() == 0) {
            return mSurfaceAsItIs;
        }
        synchronized (mAllocationLock) {
            if (mInputImageReader == null)
                return null;
            return mInputImageReader.getSurface();
        }
    }

    public boolean isFrameFilterEnabled() {
        if(mPreviewFilters.size() == 0) {
            return false;
        }
        return true;
    }

    public void setOutputSurface(Surface surface) {
        if(mPreviewFilters.size() == 0) {
            mSurfaceAsItIs = surface;
        } else {
            mOutputAllocation.setSurface(surface);
        }
    }

    class ProcessingTask implements Runnable, ImageReader.OnImageAvailableListener {
        byte[] yvuBytes = null;
        int ySize;
        int stride;
        int height;
        int width;

        public ProcessingTask() {
        }

        @Override
        public void onImageAvailable(ImageReader reader) {
            synchronized (mAllocationLock) {
                if(mOutputAllocation == null)
                    return;
                try {
                    Image image = reader.acquireLatestImage();
                    if(image == null)
                        return;
                    if(!mIsActive) {
                        image.close();
                        return;
                    }
                    mIsAllocationEverUsed = true;
                    ByteBuffer bY = image.getPlanes()[0].getBuffer();
                    ByteBuffer bVU = image.getPlanes()[2].getBuffer();
                    if(yvuBytes == null) {
                        stride = image.getPlanes()[0].getRowStride();
                        width = mSize.getWidth();
                        height = mSize.getHeight();
                        ySize = stride * mSize.getHeight();
                        yvuBytes = new byte[ySize*3/2];
                    }
                    //Start processing yvu buf
                    for (ImageFilter filter : mPreviewFilters) {
                        filter.init(mSize.getWidth(), mSize.getHeight(), stride, stride);
                        filter.addImage(bY, bVU, 0, new Boolean(true));
                    }
                    //End processing yvu buf
                    bY.get(yvuBytes, 0, bY.remaining());
                    bVU.get(yvuBytes, ySize, bVU.remaining());
                    image.close();
                    mOutingHandler.post(this);
                } catch (IllegalStateException e) {
                }
            }
        }

        @Override
        public void run() {
            synchronized (mAllocationLock) {
                if(!mIsActive) {
                    return;
                }
                if(mInputAllocation == null) {
                    createAllocation(stride, height, stride-width);
                }
                mInputAllocation.copyFrom(yvuBytes);
                mRsRotator.forEach_rotate90andMerge(mInputAllocation);
                mRsYuvToRGB.forEach_nv21ToRgb(mOutputAllocation);
                mOutputAllocation.ioSend();
            }
        }
    }

    private native int nativeRotateNV21(ByteBuffer inBuf, int imageWidth, int imageHeight, int degree, ByteBuffer outBuf);

    private native int nativeNV21toRgb(ByteBuffer yvuBuf, ByteBuffer rgbBuf, int width, int height);

    static {
        System.loadLibrary("jni_imageutil");
    }
}