package com.zxing.decode;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import com.google.zxing.LuminanceSource;
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import java.io.FileNotFoundException;
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public class RGBLuminanceSource extends LuminanceSource {
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private final byte[] luminances;
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public RGBLuminanceSource(String path) throws FileNotFoundException {
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this(loadBitmap(path));
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}
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public RGBLuminanceSource(Bitmap bitmap) {
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super(bitmap.getWidth(), bitmap.getHeight());
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int width = bitmap.getWidth();
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int height = bitmap.getHeight();
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int[] pixels = new int[width * height];
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bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
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// In order to measure pure decoding speed, we convert the entire image
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// to a greyscale array
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// up front, which is the same as the Y channel of the
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// YUVLuminanceSource in the real app.
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luminances = new byte[width * height];
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for (int y = 0; y < height; y++) {
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int offset = y * width;
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for (int x = 0; x < width; x++) {
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int pixel = pixels[offset + x];
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int r = (pixel >> 16) & 0xff;
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int g = (pixel >> 8) & 0xff;
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int b = pixel & 0xff;
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if (r == g && g == b) {
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// Image is already greyscale, so pick any channel.
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luminances[offset + x] = (byte) r;
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} else {
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// Calculate luminance cheaply, favoring green.
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luminances[offset + x] = (byte) ((r + g + g + b) >> 2);
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}
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}
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}
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}
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@Override
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public byte[] getRow(int y, byte[] row) {
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if (y < 0 || y >= getHeight()) {
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throw new IllegalArgumentException(
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"Requested row is outside the image: " + y);
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}
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int width = getWidth();
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if (row == null || row.length < width) {
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row = new byte[width];
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}
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System.arraycopy(luminances, y * width, row, 0, width);
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return row;
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}
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@Override
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public byte[] getMatrix() {
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return luminances;
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}
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private static Bitmap loadBitmap(String path) throws FileNotFoundException {
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Bitmap bitmap = BitmapFactory.decodeFile(path);
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if (bitmap == null) {
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throw new FileNotFoundException("Couldn't open " + path);
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}
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return bitmap;
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}
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}
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