DecodeHandler.java

/*
 * Copyright (C) 2010 ZXing authors
 *
 * 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.
 */

package cn.mutils.app.zxing.decode;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

import java.util.Hashtable;

import cn.mutils.app.zxing.CaptureConst;
import cn.mutils.app.zxing.CaptureView;
import cn.mutils.app.zxing.camera.CameraManager;
import cn.mutils.app.zxing.camera.PlanarYUVLuminanceSource;

final class DecodeHandler extends Handler {

    private final CaptureView mView;
    private final MultiFormatReader mMultiFormatReader;

    DecodeHandler(CaptureView activity, Hashtable<DecodeHintType, Object> hints) {
        mMultiFormatReader = new MultiFormatReader();
        mMultiFormatReader.setHints(hints);
        this.mView = activity;
    }

    @Override
    public void handleMessage(Message message) {
        switch (message.what) {
            case CaptureConst.ID_DECODE:
                // Log.d(TAG, "Got decode message");
                decode((byte[]) message.obj, message.arg1, message.arg2);
                break;
            case CaptureConst.ID_QUIT:
                Looper.myLooper().quit();
                break;
        }
    }

    /**
     * Decode the data within the viewfinder rectangle, and time how long it
     * took. For efficiency, reuse the same reader objects from one decode to
     * the next.
     *
     * @param data   The YUV preview frame.
     * @param width  The width of the preview frame.
     * @param height The height of the preview frame.
     */
    private void decode(byte[] data, int width, int height) {
        // long start = System.currentTimeMillis();
        Result rawResult = null;
        // PlanarYUVLuminanceSource source =
        // CameraManager.get().buildLuminanceSource(data, width, height);

        // 竖屏处理
        byte[] rotatedData = new byte[data.length];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++)
                rotatedData[x * height + height - y - 1] = data[x + y * width];
        }
        int tmp = width; // Here we are swapping, that's the difference to #11
        width = height;
        height = tmp;
        PlanarYUVLuminanceSource source = CameraManager.get()
                .buildLuminanceSource(rotatedData, width, height);

        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        try {
            rawResult = mMultiFormatReader.decodeWithState(bitmap);
        } catch (ReaderException re) {
            // continue
        } finally {
            mMultiFormatReader.reset();
        }

        if (rawResult != null) {
            // long end = System.currentTimeMillis();
            // Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" +
            // rawResult.toString());
            Message message = Message.obtain(mView.getCaptureHandler(),
                    CaptureConst.ID_DECODE_SUCCEEDED, rawResult);
            // Bundle bundle = new Bundle();
            // bundle.putParcelable(DecodeThread.BARCODE_BITMAP,source.renderCroppedGreyscaleBitmap());
            // message.setData(bundle);
            // Log.d(TAG, "Sending decode succeeded message...");
            message.sendToTarget();
        } else {
            Message message = Message.obtain(mView.getCaptureHandler(),
                    CaptureConst.ID_DECODE_FAILED);

            message.sendToTarget();
        }
    }

}