Add QrCamera for QrCode scanner implementation

The QrCode Scanner is for Wifi DPP feature.

Bug: 118797380
Test: RunSettingsRoboTests
Change-Id: I962d069a8c2bce78c00ac8ce9e8ebf176e75873c

src/com/android/settings/wifi/qrcode/QrYuvLuminanceSource.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 com.android.settings.wifi.qrcode;
+
+import com.google.zxing.LuminanceSource;
+
+/**
+ * This helper class implements crop method to crop preview picture.
+ */
+public class QrYuvLuminanceSource extends LuminanceSource {
+
+    private byte[] mYuvData;
+    private int mWidth;
+    private int mHeight;
+
+    public QrYuvLuminanceSource(byte[] yuvData, int width, int height) {
+        super(width, height);
+
+        mWidth = width;
+        mHeight = height;
+        mYuvData = yuvData;
+    }
+
+    @Override
+    public boolean isCropSupported() {
+        return true;
+    }
+
+    @Override
+    public LuminanceSource crop(int left, int top, int crop_width, int crop_height) {
+        final byte[] newImage = new byte[crop_width * crop_height];
+        int inputOffset = top * mWidth + left;
+
+        if (left + crop_width > mWidth || top + crop_height > mHeight) {
+            throw new IllegalArgumentException("cropped rectangle does not fit within image data.");
+        }
+
+        for (int y = 0; y < crop_height; y++) {
+            System.arraycopy(mYuvData, inputOffset, newImage, y * crop_width, crop_width);
+            inputOffset += mWidth;
+        }
+        return new QrYuvLuminanceSource(newImage, crop_width, crop_height);
+    }
+
+    @Override
+    public byte[] getRow(int y, byte[] row) {
+        if (y < 0 || y >= mHeight) {
+            throw new IllegalArgumentException("Requested row is outside the image: " + y);
+        }
+        if (row == null || row.length < mWidth) {
+            row = new byte[mWidth];
+        }
+        System.arraycopy(mYuvData, y * mWidth, row, 0, mWidth);
+        return row;
+    }
+
+    @Override
+    public byte[] getMatrix() {
+        return mYuvData;
+    }
+}