/*
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* Copyright (C) 2010 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zxing.scanner.decode;
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import android.graphics.Bitmap;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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import com.google.zxing.BinaryBitmap;
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import com.google.zxing.DecodeHintType;
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import com.google.zxing.MultiFormatReader;
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import com.google.zxing.PlanarYUVLuminanceSource;
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import com.google.zxing.ReaderException;
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import com.google.zxing.Result;
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import com.google.zxing.common.GlobalHistogramBinarizer;
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import com.zxing.scanner.camera.CameraManager;
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import com.zxing.scanner.common.Scanner;
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import java.io.ByteArrayOutputStream;
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import java.util.Map;
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final class DecodeHandler extends Handler {
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private final CameraManager cameraManager;
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private final Handler scannerViewHandler;
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private final MultiFormatReader multiFormatReader;
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private boolean running = true;
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private boolean bundleThumbnail = false;
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DecodeHandler(CameraManager cameraManager, Handler scannerViewHandler,
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Map<DecodeHintType, Object> hints, boolean bundleThumbnail) {
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this.cameraManager = cameraManager;
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this.scannerViewHandler = scannerViewHandler;
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this.bundleThumbnail = bundleThumbnail;
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multiFormatReader = new MultiFormatReader();
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multiFormatReader.setHints(hints);
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}
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@Override
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public void handleMessage(Message message) {
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if (message == null || !running) {
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return;
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}
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switch (message.what) {
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case Scanner.DECODE:
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decode((byte[]) message.obj, message.arg1, message.arg2);
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break;
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case Scanner.QUIT:
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running = false;
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Looper.myLooper().quit();
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break;
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}
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}
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/**
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* 捕捉画面并解码<br/>
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* Decode the data within the viewfinder rectangle, and time how long it
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* took. For efficiency, reuse the same reader objects from one decode to
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* the next.
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*
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* @param data The YUV preview frame.
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* @param width The width of the preview frame.
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* @param height The height of the preview frame.
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*/
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private void decode(byte[] data, int width, int height) {
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//竖屏识别一维
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if (cameraManager.isPortrait()) {
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byte[] rotatedData = new byte[data.length];
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++)
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rotatedData[x * height + height - y - 1] = data[x + y * width];
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}
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int tmp = width;
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width = height;
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height = tmp;
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data = rotatedData;
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}
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Result rawResult = null;
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PlanarYUVLuminanceSource source = cameraManager.buildLuminanceSource(data, width, height);
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if (source != null) {
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BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
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try {
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rawResult = multiFormatReader.decodeWithState(bitmap);
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} catch (ReaderException re) {
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// continue
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} finally {
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multiFormatReader.reset();
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}
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}
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Handler handler = scannerViewHandler;
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if (rawResult != null) {
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if (handler != null) {
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//会向 ScannerViewHandler 发消息
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Message message = Message.obtain(handler, Scanner.DECODE_SUCCEEDED, rawResult);
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Bundle bundle = new Bundle();
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if (bundleThumbnail)
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bundleThumbnail(source, bundle);
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message.setData(bundle);
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message.sendToTarget();
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}
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} else {
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if (handler != null) {
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Message message = Message.obtain(handler, Scanner.DECODE_FAILED);
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message.sendToTarget();
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}
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}
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}
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private static void bundleThumbnail(PlanarYUVLuminanceSource source,
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Bundle bundle) {
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int[] pixels = source.renderThumbnail();
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int width = source.getThumbnailWidth();
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int height = source.getThumbnailHeight();
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Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height,
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Bitmap.Config.ARGB_8888);
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
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bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
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bundle.putFloat(DecodeThread.BARCODE_SCALED_FACTOR, (float) width
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/ source.getWidth());
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}
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}
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