| /* |
| * Copyright (C) 2014 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.ex.camera2.portability; |
| |
| import android.graphics.Matrix; |
| import android.graphics.RectF; |
| |
| import com.android.ex.camera2.portability.debug.Log; |
| |
| /** |
| * The device info for all attached cameras. |
| */ |
| public interface CameraDeviceInfo { |
| |
| static final int NO_DEVICE = -1; |
| |
| /** |
| * @param cameraId Which device to interrogate. |
| * @return The static characteristics of the specified device, or {@code null} on error. |
| */ |
| Characteristics getCharacteristics(int cameraId); |
| |
| /** |
| * @return The total number of the available camera devices. |
| */ |
| int getNumberOfCameras(); |
| |
| /** |
| * @return The first (lowest) ID of the back cameras or {@code NO_DEVICE} |
| * if not available. |
| */ |
| int getFirstBackCameraId(); |
| |
| /** |
| * @return The first (lowest) ID of the front cameras or {@code NO_DEVICE} |
| * if not available. |
| */ |
| int getFirstFrontCameraId(); |
| |
| /** |
| * Device characteristics for a single camera. |
| */ |
| public abstract class Characteristics { |
| private static final Log.Tag TAG = new Log.Tag("CamDvcInfChar"); |
| |
| /** |
| * @return Whether the camera faces the back of the device. |
| */ |
| public abstract boolean isFacingBack(); |
| |
| /** |
| * @return Whether the camera faces the device's screen. |
| */ |
| public abstract boolean isFacingFront(); |
| |
| /** |
| * @return The camera sensor orientation, or the counterclockwise angle |
| * from its natural position that the device must be held at |
| * for the sensor to be right side up (in degrees, always a |
| * multiple of 90, and between 0 and 270, inclusive). |
| */ |
| public abstract int getSensorOrientation(); |
| |
| /** |
| * @param currentDisplayOrientation |
| * The current display orientation, measured counterclockwise |
| * from to the device's natural orientation (in degrees, always |
| * a multiple of 90, and between 0 and 270, inclusive). |
| * @return |
| * The relative preview image orientation, or the clockwise |
| * rotation angle that must be applied to display preview |
| * frames in the matching orientation, accounting for implicit |
| * mirroring, if applicable (in degrees, always a multiple of |
| * 90, and between 0 and 270, inclusive). |
| */ |
| public int getPreviewOrientation(int currentDisplayOrientation) { |
| // Drivers tend to mirror the image during front camera preview. |
| return getRelativeImageOrientation(currentDisplayOrientation, true); |
| } |
| |
| /** |
| * @param currentDisplayOrientation |
| * The current display orientation, measured counterclockwise |
| * from to the device's natural orientation (in degrees, always |
| * a multiple of 90, and between 0 and 270, inclusive). |
| * @return |
| * The relative capture image orientation, or the clockwise |
| * rotation angle that must be applied to display these frames |
| * in the matching orientation (in degrees, always a multiple |
| * of 90, and between 0 and 270, inclusive). |
| */ |
| public int getJpegOrientation(int currentDisplayOrientation) { |
| // Don't mirror during capture! |
| return getRelativeImageOrientation(currentDisplayOrientation, false); |
| } |
| |
| /** |
| * @param currentDisplayOrientaiton |
| * {@link #getPreviewOrientation}, {@link #getJpegOrientation} |
| * @param compensateForMirroring |
| * Whether to account for mirroring in the case of front-facing |
| * cameras, which is necessary iff the OS/driver is |
| * automatically reflecting the image. |
| * @return |
| * {@link #getPreviewOrientation}, {@link #getJpegOrientation} |
| * |
| * @see android.hardware.Camera.setDisplayOrientation |
| */ |
| protected int getRelativeImageOrientation(int currentDisplayOrientation, |
| boolean compensateForMirroring) { |
| if (!orientationIsValid(currentDisplayOrientation)) { |
| return 0; |
| } |
| |
| int result = 0; |
| if (isFacingFront()) { |
| result = (getSensorOrientation() + currentDisplayOrientation) % 360; |
| if (compensateForMirroring) { |
| result = (360 - result) % 360; |
| } |
| } else if (isFacingBack()) { |
| result = (getSensorOrientation() - currentDisplayOrientation + 360) % 360; |
| } else { |
| Log.e(TAG, "Camera is facing unhandled direction"); |
| } |
| return result; |
| } |
| |
| /** |
| * @param currentDisplayOrientation |
| * The current display orientation, measured counterclockwise |
| * from to the device's natural orientation (in degrees, always |
| * a multiple of 90, and between 0 and 270, inclusive). |
| * @param surfaceDimensions |
| * The dimensions of the {@link android.view.Surface} on which |
| * the preview image is being rendered. It usually only makes |
| * sense for the upper-left corner to be at the origin. |
| * @return |
| * The transform matrix that should be applied to the |
| * {@link android.view.Surface} in order for the image to |
| * display properly in the device's current orientation. |
| */ |
| public Matrix getPreviewTransform(int currentDisplayOrientation, RectF surfaceDimensions) { |
| return getPreviewTransform(currentDisplayOrientation, surfaceDimensions, |
| new RectF(surfaceDimensions)); |
| } |
| |
| /** |
| * @param currentDisplayOrientation |
| * The current display orientation, measured counterclockwise |
| * from to the device's natural orientation (in degrees, always |
| * a multiple of 90, and between 0 and 270, inclusive). |
| * @param surfaceDimensions |
| * The dimensions of the {@link android.view.Surface} on which |
| * the preview image is being rendered. It usually only makes |
| * sense for the upper-left corner to be at the origin. |
| * @param desiredBounds |
| * The boundaries within the {@link android.view.Surface} where |
| * the final image should appear. These can be used to |
| * translate and scale the output, but note that the image will |
| * be stretched to fit, possibly changing its aspect ratio. |
| * @return |
| * The transform matrix that should be applied to the |
| * {@link android.view.Surface} in order for the image to |
| * display properly in the device's current orientation. |
| */ |
| public Matrix getPreviewTransform(int currentDisplayOrientation, RectF surfaceDimensions, |
| RectF desiredBounds) { |
| if (!orientationIsValid(currentDisplayOrientation) || |
| surfaceDimensions.equals(desiredBounds)) { |
| return new Matrix(); |
| } |
| |
| Matrix transform = new Matrix(); |
| transform.setRectToRect(surfaceDimensions, desiredBounds, Matrix.ScaleToFit.FILL); |
| return transform; |
| } |
| |
| /** |
| * @return Whether the shutter sound can be disabled. |
| */ |
| public abstract boolean canDisableShutterSound(); |
| |
| protected static boolean orientationIsValid(int angle) { |
| if (angle % 90 != 0) { |
| Log.e(TAG, "Provided display orientation is not divisible by 90"); |
| return false; |
| } |
| if (angle < 0 || angle > 270) { |
| Log.e(TAG, "Provided display orientation is outside expected range"); |
| return false; |
| } |
| return true; |
| } |
| } |
| } |