/* * Copyright (C) 2008 ZXing authors * * 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.fanxin.huangfangyi.main.widget.zxing.camera; import android.content.Context; import android.graphics.PixelFormat; import android.graphics.Point; import android.graphics.Rect; import android.hardware.Camera; import android.os.Build; import android.os.Handler; import android.util.Log; import android.view.SurfaceHolder; import com.fanxin.huangfangyi.main.widget.zxing.activity.DensityUtil; import java.io.IOException; /** * This object wraps the Camera service object and expects to be the only one talking to it. The * implementation encapsulates the steps needed to take preview-sized images, which are used for * both preview and decoding. * */ @SuppressWarnings("deprecation") public final class CameraManager { private static final String TAG = CameraManager.class.getSimpleName(); private static final int MIN_FRAME_WIDTH = 340; private static final int MIN_FRAME_HEIGHT = 340; private static final int MAX_FRAME_WIDTH = 580; private static final int MAX_FRAME_HEIGHT = 460; private static CameraManager cameraManager; static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT static { int sdkInt; try { sdkInt = Integer.parseInt(Build.VERSION.SDK); } catch (NumberFormatException nfe) { // Just to be safe sdkInt = 10000; } SDK_INT = sdkInt; } private final Context context; private final CameraConfigurationManager configManager; private Camera camera; private Rect framingRect; private Rect framingRectInPreview; private boolean initialized; private boolean previewing; private final boolean useOneShotPreviewCallback; private boolean is_top=false; /** * Preview frames are delivered here, which we pass on to the registered handler. Make sure to * clear the handler so it will only receive one message. */ private final PreviewCallback previewCallback; /** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */ private final AutoFocusCallback autoFocusCallback; /** * Initializes this static object with the Context of the calling Activity. * * @param context The Activity which wants to use the camera. */ public static void init(Context context,boolean is_top) { // if (cameraManager == null) { cameraManager = new CameraManager(context,is_top); // } } /** * Gets the CameraManager singleton instance. * * @return A reference to the CameraManager singleton. */ public static CameraManager get() { return cameraManager; } private CameraManager(Context context,boolean is_top) { this.is_top=is_top; this.context = context; this.configManager = new CameraConfigurationManager(context); // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use // the more efficient one shot callback, as the older one can swamp the system and cause it // to run out of memory. We can't use SDK_INT because it was introduced in the Donut SDK. //useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > Build.VERSION_CODES.CUPCAKE; useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = Cupcake previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback); autoFocusCallback = new AutoFocusCallback(); } /** * Opens the camera driver and initializes the hardware parameters. * * @param holder The surface object which the camera will draw preview frames into. * @throws IOException Indicates the camera driver failed to open. */ public void openDriver(SurfaceHolder holder) throws IOException { if (camera == null) { camera = Camera.open(); if (camera == null) { throw new IOException(); } camera.setPreviewDisplay(holder); if (!initialized) { initialized = true; configManager.initFromCameraParameters(camera); } configManager.setDesiredCameraParameters(camera); //FIXME // SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); //�Ƿ�ʹ��ǰ�� // if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) { // FlashlightManager.enableFlashlight(); // } FlashlightManager.enableFlashlight(); } } /** * Closes the camera driver if still in use. */ public void closeDriver() { if (camera != null) { FlashlightManager.disableFlashlight(); camera.release(); camera = null; } } /** * Asks the camera hardware to begin drawing preview frames to the screen. */ public void startPreview() { if (camera != null && !previewing) { camera.startPreview(); previewing = true; } } /** * Tells the camera to stop drawing preview frames. */ public void stopPreview() { if (camera != null && previewing) { if (!useOneShotPreviewCallback) { camera.setPreviewCallback(null); } camera.stopPreview(); previewCallback.setHandler(null, 0); autoFocusCallback.setHandler(null, 0); previewing = false; } } /** * A single preview frame will be returned to the handler supplied. The data will arrive as byte[] * in the message.obj field, with width and height encoded as message.arg1 and message.arg2, * respectively. * * @param handler The handler to send the message to. * @param message The what field of the message to be sent. */ public void requestPreviewFrame(Handler handler, int message) { if (camera != null && previewing) { previewCallback.setHandler(handler, message); if (useOneShotPreviewCallback) { camera.setOneShotPreviewCallback(previewCallback); } else { camera.setPreviewCallback(previewCallback); } } } /** * Asks the camera hardware to perform an autofocus. * * @param handler The Handler to notify when the autofocus completes. * @param message The message to deliver. */ public void requestAutoFocus(Handler handler, int message) { if (camera != null && previewing ) { autoFocusCallback.setHandler(handler, message); //Log.d(TAG, "Requesting auto-focus callback"); try { camera.autoFocus(autoFocusCallback); } catch (Exception e) { } } } /** * Calculates the framing rect which the UI should draw to show the user where to place the * barcode. This target helps with alignment as well as forces the user to hold the device * far enough away to ensure the image will be in focus. * * @return The rectangle to draw on screen in window coordinates. */ public Rect getFramingRect() { Point screenResolution = configManager.getScreenResolution(); if (framingRect == null) { if (camera == null) { return null; } int width = screenResolution.x * 3 / 4; if (width < MIN_FRAME_WIDTH) { width = MIN_FRAME_WIDTH; } else if (width > MAX_FRAME_WIDTH) { width = MAX_FRAME_WIDTH; } int height = screenResolution.y * 3 / 4; if (height < MIN_FRAME_HEIGHT) { height = MIN_FRAME_HEIGHT; } else if (height > MAX_FRAME_HEIGHT) { height = MAX_FRAME_HEIGHT; } int leftOffset = (screenResolution.x - width) / 2; int topOffset=(screenResolution.y - height) / 2; if(is_top){ topOffset= DensityUtil.dip2px(getContext(),80); } framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + framingRect); } return framingRect; } /** * Like {@link #getFramingRect} but coordinates are in terms of the preview frame, * not UI / screen. */ public Rect getFramingRectInPreview() { if (framingRectInPreview == null) { Rect rect = new Rect(getFramingRect()); Point cameraResolution = configManager.getCameraResolution(); Point screenResolution = configManager.getScreenResolution(); //modify here // rect.left = rect.left * cameraResolution.x / screenResolution.x; // rect.right = rect.right * cameraResolution.x / screenResolution.x; // rect.top = rect.top * cameraResolution.y / screenResolution.y; // rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y; rect.left = rect.left * cameraResolution.y / screenResolution.x; rect.right = rect.right * cameraResolution.y / screenResolution.x; rect.top = rect.top * cameraResolution.x / screenResolution.y; rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y; framingRectInPreview = rect; } return framingRectInPreview; } /** * Converts the result points from still resolution coordinates to screen coordinates. * * @param points The points returned by the Reader subclass through Result.getResultPoints(). * @return An array of Points scaled to the size of the framing rect and offset appropriately * so they can be drawn in screen coordinates. */ /* public Point[] convertResultPoints(ResultPoint[] points) { Rect frame = getFramingRectInPreview(); int count = points.length; Point[] output = new Point[count]; for (int x = 0; x < count; x++) { output[x] = new Point(); output[x].x = frame.left + (int) (points[x].getX() + 0.5f); output[x].y = frame.top + (int) (points[x].getY() + 0.5f); } return output; } */ /** * A factory method to build the appropriate LuminanceSource object based on the format * of the preview buffers, as described by Camera.Parameters. * * @param data A preview frame. * @param width The width of the image. * @param height The height of the image. * @return A PlanarYUVLuminanceSource instance. */ public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) { Rect rect = getFramingRectInPreview(); int previewFormat = configManager.getPreviewFormat(); String previewFormatString = configManager.getPreviewFormatString(); switch (previewFormat) { // This is the standard Android format which all devices are REQUIRED to support. // In theory, it's the only one we should ever care about. case PixelFormat.YCbCr_420_SP: // This format has never been seen in the wild, but is compatible as we only care // about the Y channel, so allow it. case PixelFormat.YCbCr_422_SP: return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height()); default: // The Samsung Moment incorrectly uses this variant instead of the 'sp' version. // Fortunately, it too has all the Y data up front, so we can read it. if ("yuv420p".equals(previewFormatString)) { return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height()); } } throw new IllegalArgumentException("Unsupported picture format: " + previewFormat + '/' + previewFormatString); } public Context getContext() { return context; } }