/*
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* Copyright (C) 2008 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.videogo.scan.camera;
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import java.io.IOException;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.graphics.Point;
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import android.graphics.Rect;
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import android.hardware.Camera;
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import android.os.Handler;
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import android.preference.PreferenceManager;
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import android.view.SurfaceHolder;
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import com.videogo.scan.main.PlanarYUVLuminanceSource;
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import com.videogo.scan.main.PreferencesActivity;
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import com.videogo.util.LogUtil;
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public final class CameraManager {
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private static final String TAG = CameraManager.class.getSimpleName();
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// private static final int MIN_FRAME_WIDTH = 240;
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// private static final int MIN_FRAME_HEIGHT = 240;
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// private static final int MAX_FRAME_WIDTH = 600;
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// private static final int MAX_FRAME_HEIGHT = 400;
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private final Context context;
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private final CameraConfigurationManager configManager;
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private Camera camera;
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private Rect framingRect;
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private Rect framingRectInPreview;
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private boolean initialized;
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private boolean previewing;
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private boolean reverseImage;
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private int requestedFramingRectWidth;
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private int requestedFramingRectHeight;
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private final PreviewCallback previewCallback;
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private final AutoFocusCallback autoFocusCallback;
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public CameraManager(Context context) {
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this.context = context;
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this.configManager = new CameraConfigurationManager(context);
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previewCallback = new PreviewCallback(configManager);
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autoFocusCallback = new AutoFocusCallback();
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}
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public void openDriver(SurfaceHolder holder) throws IOException {
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Camera theCamera = camera;
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if (theCamera == null) {
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theCamera = Camera.open();
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if (theCamera == null) {
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throw new IOException();
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}
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camera = theCamera;
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}
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theCamera.setPreviewDisplay(holder);
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if (!initialized) {
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initialized = true;
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configManager.initFromCameraParameters(theCamera);
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if (requestedFramingRectWidth > 0 && requestedFramingRectHeight > 0) {
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setManualFramingRect(requestedFramingRectWidth, requestedFramingRectHeight);
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requestedFramingRectWidth = 0;
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requestedFramingRectHeight = 0;
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}
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}
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configManager.setDesiredCameraParameters(theCamera);
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
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reverseImage = prefs.getBoolean(PreferencesActivity.KEY_REVERSE_IMAGE, false);
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}
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public void closeDriver() {
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if (camera != null) {
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camera.release();
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camera = null;
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// Make sure to clear these each time we close the camera, so that any scanning rect
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// requested by intent is forgotten.
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framingRect = null;
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framingRectInPreview = null;
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}
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}
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public void startPreview() {
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Camera theCamera = camera;
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if (theCamera != null && !previewing) {
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theCamera.startPreview();
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previewing = true;
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}
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}
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public void stopPreview() {
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if (camera != null && previewing) {
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camera.stopPreview();
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previewCallback.setHandler(null, 0);
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autoFocusCallback.setHandler(null, 0);
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previewing = false;
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}
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}
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public void requestPreviewFrame(Handler handler, int message) {
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Camera theCamera = camera;
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if (theCamera != null && previewing) {
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previewCallback.setHandler(handler, message);
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theCamera.setOneShotPreviewCallback(previewCallback);
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}
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}
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public void requestAutoFocus(Handler handler, int message) {
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if (camera != null && previewing) {
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autoFocusCallback.setHandler(handler, message);
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try {
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camera.autoFocus(autoFocusCallback);
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} catch (RuntimeException re) {
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// Have heard RuntimeException reported in Android 4.0.x+; continue?
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LogUtil.w(TAG, "Unexpected exception while focusing", re);
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}
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}
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}
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public Rect getFramingRect() {
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// if (framingRect == null) {
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// if (camera == null) {
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// return null;
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// }
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// Point screenResolution = configManager.getScreenResolution();
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// int width = screenResolution.x * 3 / 4;
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// if (width < MIN_FRAME_WIDTH) {
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// width = MIN_FRAME_WIDTH;
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// } else if (width > MAX_FRAME_WIDTH) {
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// width = MAX_FRAME_WIDTH;
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// }
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// int height = screenResolution.y * 3 / 4;
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// if (height < MIN_FRAME_HEIGHT) {
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// height = MIN_FRAME_HEIGHT;
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// } else if (height > MAX_FRAME_HEIGHT) {
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// height = MAX_FRAME_HEIGHT;
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// }
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// int leftOffset = (screenResolution.x - width) / 2;
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// int topOffset = (screenResolution.y - height) / 2;
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// framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
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// LogUtil.d(TAG, "Calculated framing rect: " + framingRect);
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// }
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// return framingRect;
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Point screenResolution = configManager.getScreenResolution();
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if (framingRect == null) {
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if (camera == null) {
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return null;
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}
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int height;
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int width = (int) (screenResolution.y * 0.83);
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height = width;
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int leftOffset = (screenResolution.y - width) / 2;
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int topOffset = (screenResolution.x - height) / 2;
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framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
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LogUtil.d(TAG, "Calculated framing rect: " + framingRect);
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}
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return framingRect;
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}
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public Rect getFramingRectInPreview() {
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if (framingRectInPreview == null) {
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Rect framingRect = getFramingRect();
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if (framingRect == null) {
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return null;
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}
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Rect rect = new Rect(framingRect);
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Point cameraResolution = configManager.getCameraResolution();
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Point screenResolution = configManager.getScreenResolution();
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rect.left = rect.left * cameraResolution.y / screenResolution.y;
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rect.right = rect.right * cameraResolution.y / screenResolution.y;
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rect.top = rect.top * cameraResolution.x / screenResolution.x;
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rect.bottom = rect.bottom * cameraResolution.x / screenResolution.x;
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framingRectInPreview = rect;
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}
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return framingRectInPreview;
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}
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public void setManualFramingRect(int width, int height) {
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if (initialized) {
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Point screenResolution = configManager.getScreenResolution();
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if (width > screenResolution.x) {
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width = screenResolution.x;
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}
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if (height > screenResolution.y) {
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height = screenResolution.y;
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}
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int leftOffset = (screenResolution.x - width) / 2;
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int topOffset = (screenResolution.y - height) / 2;
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framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
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LogUtil.d(TAG, "Calculated manual framing rect: " + framingRect);
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framingRectInPreview = null;
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} else {
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requestedFramingRectWidth = width;
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requestedFramingRectHeight = height;
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}
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}
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public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
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Rect rect = getFramingRectInPreview();
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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.height(),
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reverseImage);
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}
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}
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