path: root/src/com/android/camera/ui/TrackingFocusRenderer.java

/*
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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
      disclaimer in the documentation and/or other materials provided
      with the distribution.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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 */

package com.android.camera.ui;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.MotionEvent;

import com.android.camera.CameraActivity;
import com.android.camera.CaptureModule;
import com.android.camera.CaptureUI;
import com.android.camera.imageprocessor.filter.TrackingFocusFrameListener;

public class TrackingFocusRenderer extends OverlayRenderer implements FocusIndicator {
    private FocusRequestThread mFocusRequestThread = null;
    private TrackingFocusFrameListener.Result mResult;
    private CameraActivity mActivity;
    private CaptureModule mModule;
    private Paint mTargetPaint;
    private int mInX = -1;
    private int mInY = -1;
    private final static int CIRCLE_THUMB_SIZE = 100;
    private Object mLock = new Object();
    private Rect mSurfaceDim;
    private CaptureUI mUI;

    public final static int STATUS_INIT = 0;
    public final static int STATUS_INPUT = 1;
    public final static int STATUS_TRACKING = 2;
    public final static int STATUS_TRACKED = 3;
    private int mStatus = STATUS_INIT;

    private final static String TAG = "TrackingFocusRenderer";
    private final static boolean DEBUG = false; //Enabling DEBUG LOG reduces the performance drastically.

    private void printErrorLog(String msg) {
        if(DEBUG) {
            android.util.Log.e(TAG, msg);
        }
    }

    @Override
    public void setVisible(boolean visible) {
        super.setVisible(visible);
        if(!visible) {
            synchronized (mLock) {
                mStatus = STATUS_INIT;
                mResult = null;
                mInX = 0;
                mInY = 0;
            }
            if(mFocusRequestThread != null) {
                mFocusRequestThread.kill();
                mFocusRequestThread = null;
            }
        } else {
            mFocusRequestThread = new FocusRequestThread();
            mFocusRequestThread.start();
        }
    }

    public void setSurfaceDim(int left, int top, int right, int bottom) {
        mSurfaceDim = new Rect(left, top, right, bottom);
    }

    public TrackingFocusRenderer(CameraActivity activity, CaptureModule module, CaptureUI ui) {
        mActivity = activity;
        mModule = module;
        mUI = ui;
        mTargetPaint = new Paint();
        mTargetPaint.setStrokeWidth(4f);
        mTargetPaint.setStyle(Paint.Style.STROKE);
    }

    @Override
    public boolean handlesTouch() {
        return true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch(event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_UP:
                synchronized (mLock) {
                    mInX = (int) event.getX();
                    mInY = (int) event.getY();
                    if(!mSurfaceDim.contains(mInX, mInY)) {
                        break;
                    }
                    mStatus = STATUS_INPUT;
                }
                update();
                break;
        }
        return true;
    }

    public int[] getInputCords(int width, int height) {
        synchronized (mLock) {
            if (mStatus != STATUS_INPUT) {
                return null;
            }
            mStatus = STATUS_TRACKING;
            int x = (mUI.getDisplaySize().y-1-mInY);
            int y = mInX;
            int bottomMargin = mUI.getDisplaySize().y - mSurfaceDim.bottom;
            x = (int)((x - bottomMargin)*((float)width/mSurfaceDim.height()));
            y = (int)((y - mSurfaceDim.left)*((float)height/mSurfaceDim.width()));

            /* It's supposed to give x,y like above but library x,y is reversed*/
            if(mModule.isBackCamera()) {
                x = width - 1 - x;
            }
            y = height-1-y;

            return new int[]{x, y};
        }
    }

    public void putRegisteredCords(TrackingFocusFrameListener.Result result, int width, int height) {
        synchronized (mLock) {
            if(result != null && result.pos != null &&
                    !(result.pos.width() == 0 && result.pos.height() == 0)) {
                result.pos = translateToSurface(result.pos, width, height);
                mResult = result;
                mStatus = STATUS_TRACKED;
            } else {
                mStatus = STATUS_TRACKING;
            }
        }
        mActivity.runOnUiThread(new Runnable() {
            public void run() {
                update();
            }
        });
    }

    private Rect translateToSurface(Rect src, int width, int height) {
        /* It's supposed to be this but direction is reversed in library.
        int x = src.centerY();
        int y = width-1-src.centerX();
         */
        int x = height-1-src.centerY();
        int y = src.centerX();
        if(!mModule.isBackCamera()) {
            y = width-1-src.centerX();
        }
        int w = (int)(src.height()*((float)mSurfaceDim.width()/height));
        int h = (int)(src.width()*((float)mSurfaceDim.height()/width));
        x = mSurfaceDim.left + (int)(x*((float)mSurfaceDim.width()/height));
        y = mSurfaceDim.top + (int)(y*((float)mSurfaceDim.height()/width));
        Rect rect = new Rect();
        rect.left = x - w/2;
        rect.top = y - h/2;
        rect.right = rect.left + w;
        rect.bottom = rect.top + h;
        return rect;
    }

    private Rect mRect;

    @Override
    public void onDraw(Canvas canvas) {
        synchronized (mLock) {
            if(mResult == null) {
                return;
            }
            if(mStatus == STATUS_TRACKED) {
                mRect = mResult.pos;
            }
        }

        if(mStatus == STATUS_TRACKED) {
            if(mRect != null) {
                mTargetPaint.setColor(Color.GREEN);
                canvas.drawRect(mRect, mTargetPaint);
            }
        } else if(mStatus == STATUS_TRACKING){
            if(mRect != null) {
                mTargetPaint.setColor(Color.RED);
                canvas.drawRect(mRect, mTargetPaint);
            }
        } else if(mStatus == STATUS_INPUT){
            mTargetPaint.setColor(Color.RED);
            canvas.drawCircle(mInX, mInY, CIRCLE_THUMB_SIZE, mTargetPaint);
        }
    }

    @Override
    public void showStart() {
    }

    @Override
    public void showSuccess(boolean timeout) {
    }

    @Override
    public void showFail(boolean timeout) {

    }

    @Override
    public void clear() {

    }

    private class FocusRequestThread extends Thread {
        private boolean isRunning = true;
        private final static int FOCUS_DELAY = 1000;
        private final static int MIN_DIFF_CORDS = 100;
        private final static int MIN_DIFF_SIZE = 100;
        private int mOldX = -MIN_DIFF_CORDS;
        private int mOldY = -MIN_DIFF_CORDS;
        private int mOldWidth = -MIN_DIFF_SIZE;
        private int mOldHeight = -MIN_DIFF_SIZE;
        private int mNewX;
        private int mNewY;
        private int mNewWidth;
        private int mNewHeight;

        public void kill() {
            isRunning = false;
        }

        public void run() {
            while(isRunning) {
                try {
                    Thread.sleep(FOCUS_DELAY);
                }catch(InterruptedException e) {
                    //Ignore
                }

                synchronized (mLock) {
                    if (mResult == null || mResult.pos == null
                            || (mResult.pos.centerX() == 0 && mResult.pos.centerY() == 0)) {
                        continue;
                    }
                    mNewX = mResult.pos.centerX();
                    mNewY = mResult.pos.centerY();
                    mNewWidth = mResult.pos.width();
                    mNewHeight = mResult.pos.height();
                }
                if(Math.abs(mOldX - mNewX) >= MIN_DIFF_CORDS || Math.abs(mOldY - mNewY) >= MIN_DIFF_CORDS  ||
                        Math.abs(mOldWidth - mNewWidth) >= MIN_DIFF_SIZE || Math.abs(mOldHeight - mNewHeight) >= MIN_DIFF_SIZE) {
                    mModule.onSingleTapUp(null, mNewX, mNewY);
                    mOldX = mNewX;
                    mOldY = mNewY;
                    mOldWidth = mNewWidth;
                    mOldHeight = mNewHeight;
                }
            }
        }
    }
}