package com.zxing.decode;
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import android.graphics.Bitmap;
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import android.graphics.Rect;
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import android.hardware.Camera.Size;
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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.HybridBinarizer;
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import com.zxing.IZxingActivity;
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import com.zxing.R;
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import java.io.ByteArrayOutputStream;
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import java.util.Map;
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public class DecodeHandler extends Handler {
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private final IZxingActivity activity;
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private final MultiFormatReader multiFormatReader;
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private boolean running = true;
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public DecodeHandler(IZxingActivity activity, Map<DecodeHintType, Object> hints) {
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multiFormatReader = new MultiFormatReader();
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multiFormatReader.setHints(hints);
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this.activity = activity;
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}
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private static void bundleThumbnail(PlanarYUVLuminanceSource source, 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, 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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}
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@Override
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public void handleMessage(Message message) {
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if (!running) {
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return;
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}
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if (message.what == R.id.decode) {
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decode((byte[]) message.obj, message.arg1, message.arg2);
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} else if (message.what == R.id.quit) {
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running = false;
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Looper.myLooper().quit();
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}
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}
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/**
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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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Size size = activity.getCameraManager().getPreviewSize();
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// 这里需要将获取的data翻转一下，因为相机默认拿的的横屏的数据
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byte[] rotatedData = new byte[data.length];
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for (int y = 0; y < size.height; y++) {
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for (int x = 0; x < size.width; x++)
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rotatedData[x * size.height + size.height - y - 1] = data[x + y * size.width];
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}
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// 宽高也要调整
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int tmp = size.width;
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size.width = size.height;
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size.height = tmp;
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Result rawResult = null;
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PlanarYUVLuminanceSource source = buildLuminanceSource(rotatedData, size.width, size.height);
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if (source != null) {
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BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(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 = activity.getHandler();
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if (rawResult != null) {
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// Don't log the barcode contents for security.
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if (handler != null) {
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Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
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Bundle bundle = new Bundle();
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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, R.id.decode_failed);
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message.sendToTarget();
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}
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}
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}
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/**
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* A factory method to build the appropriate LuminanceSource object based on
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* the format of the preview buffers, as described by Camera.Parameters.
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*
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* @param data A preview frame.
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* @param width The width of the image.
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* @param height The height of the image.
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* @return A PlanarYUVLuminanceSource instance.
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*/
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public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
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Rect rect = activity.getCropRect();
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if (rect == null) {
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return null;
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}
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// Go ahead and assume it's YUV rather than die.
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return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect
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.height(), false);
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}
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}
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