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