package com.wisedu.scc.love.widget.qrcode.camera;
import android.content.Context;
import android.graphics.Point;
import android.hardware.Camera;
import android.os.Build;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
import java.lang.reflect.Method;
import java.util.regex.Pattern;
/**
* 相机配置管理器
*/
final class CameraConfigurationManager {
private static final String TAG = CameraConfigurationManager.class.getSimpleName();
private static final int TEN_DESIRED_ZOOM = 27;
private static final int DESIRED_SHARPNESS = 30;
private static final Pattern COMMA_PATTERN = Pattern.compile(",");
private final Context context;
private Point screenResolution;
private Point cameraResolution;
private int previewFormat;
private String previewFormatString;
CameraConfigurationManager(Context context) {
this.context = context;
}
/**
* 一次性从Camera读取数据
*/
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
previewFormat = parameters.getPreviewFormat();
previewFormatString = parameters.get("preview-format");
WindowManager manager = (WindowManager)
context.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
screenResolution = new Point(display.getWidth(), display.getHeight());
cameraResolution = getCameraResolution(parameters, screenResolution);
}
/**
* Sets the camera up to take preview images which are used for both preview and decoding.
* 设置Camera以获取预览图片
*/
void setDesiredCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
setFlash(parameters);
setZoom(parameters);
setDisplayOrientation(camera, 90);
camera.setParameters(parameters);
}
Point getCameraResolution() {
return cameraResolution;
}
Point getScreenResolution() {
return screenResolution;
}
int getPreviewFormat() {
return previewFormat;
}
String getPreviewFormatString() {
return previewFormatString;
}
/**
* 获取相机解决方案
* @param parameters
* @param screenResolution
* @return
*/
private static Point getCameraResolution(Camera.Parameters parameters, Point screenResolution) {
String previewSizeValueString = parameters.get("preview-size-values");
if (previewSizeValueString == null) {
previewSizeValueString = parameters.get("preview-size-value");
}
Point cameraResolution = null;
if (previewSizeValueString != null) {
cameraResolution = findBestPreviewSizeValue(previewSizeValueString, screenResolution);
}
if (cameraResolution == null) {
cameraResolution = new Point(
(screenResolution.x >> 3) << 3,
(screenResolution.y >> 3) << 3);
}
return cameraResolution;
}
/**
* 获取最优预览大小
* @param previewSizeValueString
* @param screenResolution
* @return
*/
private static Point findBestPreviewSizeValue(CharSequence previewSizeValueString, Point screenResolution) {
int bestX = 0;
int bestY = 0;
int diff = Integer.MAX_VALUE;
for (String previewSize : COMMA_PATTERN.split(previewSizeValueString)) {
previewSize = previewSize.trim();
int dimPosition = previewSize.indexOf('x');
if (dimPosition < 0) {
Log.w(TAG, "Bad preview-size: " + previewSize);
continue;
}
int newX, newY;
try {
newX = Integer.parseInt(previewSize.substring(0, dimPosition));
newY = Integer.parseInt(previewSize.substring(dimPosition + 1));
} catch (NumberFormatException nfe) {
Log.w(TAG, "Bad preview-size: " + previewSize);
continue;
}
int newDiff = Math.abs(newX - screenResolution.x) + Math.abs(newY - screenResolution.y);
if (newDiff == 0) {
bestX = newX;
bestY = newY;
break;
} else if (newDiff < diff) {
bestX = newX;
bestY = newY;
diff = newDiff;
}
}
if (bestX > 0 && bestY > 0) {
return new Point(bestX, bestY);
}
return null;
}
/**
* 获取最优缩放值
* @param stringValues
* @param tenDesiredZoom
* @return
*/
private static int findBestMotZoomValue(CharSequence stringValues, int tenDesiredZoom) {
int tenBestValue = 0;
for (String stringValue : COMMA_PATTERN.split(stringValues)) {
stringValue = stringValue.trim();
double value;
try {
value = Double.parseDouble(stringValue);
} catch (NumberFormatException nfe) {
return tenDesiredZoom;
}
int tenValue = (int) (10.0 * value);
if (Math.abs(tenDesiredZoom - value) < Math.abs(tenDesiredZoom - tenBestValue)) {
tenBestValue = tenValue;
}
}
return tenBestValue;
}
/**
* 设置Flash
* @param parameters
*/
private void setFlash(Camera.Parameters parameters) {
// FIXME: This is a hack to turn the flash off on the Samsung Galaxy.
if (Build.MODEL.contains("Behold II") && CameraManager.SDK_INT == 3) { // 3 = Cupcake
parameters.set("flash-value", 1);
} else {
parameters.set("flash-value", 2);
}
// This is the standard setting to turn the flash off that all devices should honor.
parameters.set("flash-mode", "off");
}
/**
* 设置缩放
* @param parameters
*/
private void setZoom(Camera.Parameters parameters) {
String zoomSupportedString = parameters.get("zoom-supported");
if (zoomSupportedString != null && !Boolean.parseBoolean(zoomSupportedString)) {
return;
}
int tenDesiredZoom = TEN_DESIRED_ZOOM;
String maxZoomString = parameters.get("max-zoom");
if (maxZoomString != null) {
try {
int tenMaxZoom = (int) (10.0 * Double.parseDouble(maxZoomString));
if (tenDesiredZoom > tenMaxZoom) {
tenDesiredZoom = tenMaxZoom;
}
} catch (NumberFormatException nfe) {
Log.w(TAG, "Bad max-zoom: " + maxZoomString);
}
}
String takingPictureZoomMaxString = parameters.get("taking-picture-zoom-max");
if (takingPictureZoomMaxString != null) {
try {
int tenMaxZoom = Integer.parseInt(takingPictureZoomMaxString);
if (tenDesiredZoom > tenMaxZoom) {
tenDesiredZoom = tenMaxZoom;
}
} catch (NumberFormatException nfe) {
Log.w(TAG, "Bad taking-picture-zoom-max: " + takingPictureZoomMaxString);
}
}
String motZoomValuesString = parameters.get("mot-zoom-values");
if (motZoomValuesString != null) {
tenDesiredZoom = findBestMotZoomValue(motZoomValuesString, tenDesiredZoom);
}
String motZoomStepString = parameters.get("mot-zoom-step");
if (motZoomStepString != null) {
try {
double motZoomStep = Double.parseDouble(motZoomStepString.trim());
int tenZoomStep = (int) (10.0 * motZoomStep);
if (tenZoomStep > 1) {
tenDesiredZoom -= tenDesiredZoom % tenZoomStep;
}
} catch (NumberFormatException nfe) {
// continue
}
}
// Set zoom. This helps encourage the user to pull back.
// Some devices like the Behold have a zoom parameter
if (maxZoomString != null || motZoomValuesString != null) {
parameters.set("zoom", String.valueOf(tenDesiredZoom / 10.0));
}
// Most devices, like the Hero, appear to expose this zoom parameter.
// It takes on values like "27" which appears to mean 2.7x zoom
if (takingPictureZoomMaxString != null) {
parameters.set("taking-picture-zoom", tenDesiredZoom);
}
}
public static int getDesiredSharpness() {
return DESIRED_SHARPNESS;
}
/**
* compatible 1.6
* @param camera
* @param angle
*/
protected void setDisplayOrientation(Camera camera, int angle){
Method downPolymorphic;
try {
downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
if (downPolymorphic != null)
downPolymorphic.invoke(camera, new Object[] { angle });
} catch (Exception e1) {
}
}
}