/*
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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.tejia.lijin.app.util.zxing.camera;
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import android.content.Context;
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import android.graphics.Point;
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import android.hardware.Camera;
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import android.util.Log;
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import android.view.Display;
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import android.view.WindowManager;
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import java.util.regex.Pattern;
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final class CameraConfigurationManager {
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private static final String TAG = CameraConfigurationManager.class.getSimpleName();
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private static final int TEN_DESIRED_ZOOM = 5;
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private static final int DESIRED_SHARPNESS = 30;
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private static final Pattern COMMA_PATTERN = Pattern.compile(",");
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private final Context context;
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private Point screenResolution;
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private Point cameraResolution;
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CameraConfigurationManager(Context context) {
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this.context = context;
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}
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void initFromCameraParameters(Camera camera) {
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Camera.Parameters parameters = camera.getParameters();
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WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
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Display display = manager.getDefaultDisplay();
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screenResolution = new Point(display.getWidth(), display.getHeight());
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Log.d(TAG, "Screen resolution: " + screenResolution);
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Point screenResolutionForCamera = new Point();
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screenResolutionForCamera.x = screenResolution.x;
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screenResolutionForCamera.y = screenResolution.y;
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if (screenResolution.x < screenResolution.y) {
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screenResolutionForCamera.x = screenResolution.y;
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screenResolutionForCamera.y = screenResolution.x;
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}
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cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
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}
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void setDesiredCameraParameters(Camera camera) {
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Camera.Parameters parameters = camera.getParameters();
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Log.d(TAG, "Setting preview size: " + cameraResolution);
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parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
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setZoom(parameters);
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//setSharpness(parameters);
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//modify here
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camera.setDisplayOrientation(90);
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camera.setParameters(parameters);
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}
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Point getCameraResolution() {
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return cameraResolution;
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}
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Point getScreenResolution() {
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return screenResolution;
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}
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private static Point getCameraResolution(Camera.Parameters parameters, Point screenResolution) {
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String previewSizeValueString = parameters.get("preview-size-values");
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// saw this on Xperia
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if (previewSizeValueString == null) {
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previewSizeValueString = parameters.get("preview-size-value");
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}
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Point cameraResolution = null;
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if (previewSizeValueString != null) {
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Log.d(TAG, "preview-size-values parameter: " + previewSizeValueString);
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cameraResolution = findBestPreviewSizeValue(previewSizeValueString, screenResolution);
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}
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if (cameraResolution == null) {
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// Ensure that the camera resolution is a multiple of 8, as the screen may not be.
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cameraResolution = new Point(
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(screenResolution.x >> 3) << 3,
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(screenResolution.y >> 3) << 3);
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}
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return cameraResolution;
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}
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private static Point findBestPreviewSizeValue(CharSequence previewSizeValueString, Point screenResolution) {
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int bestX = 0;
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int bestY = 0;
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int diff = Integer.MAX_VALUE;
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for (String previewSize : COMMA_PATTERN.split(previewSizeValueString)) {
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previewSize = previewSize.trim();
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int dimPosition = previewSize.indexOf('x');
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if (dimPosition < 0) {
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Log.w(TAG, "Bad preview-size: " + previewSize);
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continue;
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}
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int newX;
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int newY;
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try {
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newX = Integer.parseInt(previewSize.substring(0, dimPosition));
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newY = Integer.parseInt(previewSize.substring(dimPosition + 1));
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} catch (NumberFormatException nfe) {
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Log.w(TAG, "Bad preview-size: " + previewSize);
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continue;
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}
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int newDiff = Math.abs(newX - screenResolution.x) + Math.abs(newY - screenResolution.y);
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if (newDiff == 0) {
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bestX = newX;
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bestY = newY;
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break;
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} else if (newDiff < diff) {
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bestX = newX;
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bestY = newY;
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diff = newDiff;
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}
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}
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if (bestX > 0 && bestY > 0) {
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return new Point(bestX, bestY);
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}
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return null;
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}
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private static int findBestMotZoomValue(CharSequence stringValues, int tenDesiredZoom) {
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int tenBestValue = 0;
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for (String stringValue : COMMA_PATTERN.split(stringValues)) {
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stringValue = stringValue.trim();
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double value;
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try {
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value = Double.parseDouble(stringValue);
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} catch (NumberFormatException nfe) {
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return tenDesiredZoom;
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}
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int tenValue = (int) (10.0 * value);
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if (Math.abs(tenDesiredZoom - value) < Math.abs(tenDesiredZoom - tenBestValue)) {
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tenBestValue = tenValue;
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}
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}
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return tenBestValue;
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}
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private void setZoom(Camera.Parameters parameters) {
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String zoomSupportedString = parameters.get("zoom-supported");
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if (zoomSupportedString != null && !Boolean.parseBoolean(zoomSupportedString)) {
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return;
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}
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int tenDesiredZoom = TEN_DESIRED_ZOOM;
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String maxZoomString = parameters.get("max-zoom");
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if (maxZoomString != null) {
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try {
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int tenMaxZoom = (int) (10.0 * Double.parseDouble(maxZoomString));
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if (tenDesiredZoom > tenMaxZoom) {
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tenDesiredZoom = tenMaxZoom;
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}
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} catch (NumberFormatException nfe) {
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Log.w(TAG, "Bad max-zoom: " + maxZoomString);
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}
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}
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String takingPictureZoomMaxString = parameters.get("taking-picture-zoom-max");
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if (takingPictureZoomMaxString != null) {
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try {
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int tenMaxZoom = Integer.parseInt(takingPictureZoomMaxString);
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if (tenDesiredZoom > tenMaxZoom) {
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tenDesiredZoom = tenMaxZoom;
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}
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} catch (NumberFormatException nfe) {
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Log.w(TAG, "Bad taking-picture-zoom-max: " + takingPictureZoomMaxString);
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}
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}
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String motZoomValuesString = parameters.get("mot-zoom-values");
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if (motZoomValuesString != null) {
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tenDesiredZoom = findBestMotZoomValue(motZoomValuesString, tenDesiredZoom);
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}
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String motZoomStepString = parameters.get("mot-zoom-step");
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if (motZoomStepString != null) {
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try {
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double motZoomStep = Double.parseDouble(motZoomStepString.trim());
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int tenZoomStep = (int) (10.0 * motZoomStep);
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if (tenZoomStep > 1) {
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tenDesiredZoom -= tenDesiredZoom % tenZoomStep;
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}
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} catch (NumberFormatException nfe) {
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// continue
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}
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}
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// Set zoom. This helps encourage the user to pull back.
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// Some devices like the Behold have a zoom parameter
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if (maxZoomString != null || motZoomValuesString != null) {
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parameters.set("zoom", String.valueOf(tenDesiredZoom / 10.0));
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}
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// Most devices, like the Hero, appear to expose this zoom parameter.
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// It takes on values like "27" which appears to mean 2.7x zoom
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if (takingPictureZoomMaxString != null) {
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parameters.set("taking-picture-zoom", tenDesiredZoom);
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}
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}
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public static int getDesiredSharpness() {
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return DESIRED_SHARPNESS;
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}
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}
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