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December 18, 2017 02:07
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/*** | |
Copyright (c) 2013 CommonsWare, LLC | |
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.commonsware.cwac.camera; | |
import android.hardware.Camera; | |
import android.hardware.Camera.Size; | |
import java.util.Collections; | |
import java.util.Comparator; | |
import java.util.List; | |
public class CameraUtils { | |
// based on ApiDemos | |
private static final double ASPECT_TOLERANCE=0.1; | |
public static Camera.Size getOptimalPreviewSize(int displayOrientation, | |
int width, | |
int height, | |
Camera.Parameters parameters) { | |
double targetRatio=(double)width / height; | |
List<Camera.Size> sizes=parameters.getSupportedPreviewSizes(); | |
Camera.Size optimalSize=null; | |
double minDiff=Double.MAX_VALUE; | |
int targetHeight=height; | |
if (displayOrientation == 90 || displayOrientation == 270) { | |
targetRatio=(double)height / width; | |
} | |
// Try to find an size match aspect ratio and size | |
for (Size size : sizes) { | |
double ratio=(double)size.width / size.height; | |
if (Math.abs(ratio - targetRatio) <= ASPECT_TOLERANCE) { | |
if (Math.abs(size.height - targetHeight) < minDiff) { | |
optimalSize=size; | |
minDiff=Math.abs(size.height - targetHeight); | |
} | |
} | |
} | |
// Cannot find the one match the aspect ratio, ignore | |
// the requirement | |
if (optimalSize == null) { | |
minDiff=Double.MAX_VALUE; | |
for (Size size : sizes) { | |
if (Math.abs(size.height - targetHeight) < minDiff) { | |
optimalSize=size; | |
minDiff=Math.abs(size.height - targetHeight); | |
} | |
} | |
} | |
return(optimalSize); | |
} | |
public static Camera.Size getBestAspectPreviewSize(int displayOrientation, | |
int width, | |
int height, | |
Camera.Parameters parameters) { | |
return(getBestAspectPreviewSize(displayOrientation, width, height, | |
parameters, 0.0d)); | |
} | |
public static Camera.Size getBestAspectPreviewSize(int displayOrientation, | |
int width, | |
int height, | |
Camera.Parameters parameters, | |
double closeEnough) { | |
double targetRatio=(double)width / height; | |
Camera.Size optimalSize=null; | |
double minDiff=Double.MAX_VALUE; | |
if (displayOrientation == 90 || displayOrientation == 270) { | |
targetRatio=(double)height / width; | |
} | |
List<Size> sizes=parameters.getSupportedPreviewSizes(); | |
Collections.sort(sizes, | |
Collections.reverseOrder(new SizeComparator())); | |
for (Size size : sizes) { | |
double ratio=(double)size.width / size.height; | |
if (Math.abs(ratio - targetRatio) < minDiff) { | |
optimalSize=size; | |
minDiff=Math.abs(ratio - targetRatio); | |
} | |
if (minDiff < closeEnough) { | |
break; | |
} | |
} | |
return(optimalSize); | |
} | |
public static Camera.Size getLargestPictureSize(CameraHost host, | |
Camera.Parameters parameters) { | |
return(getLargestPictureSize(host, parameters, true)); | |
} | |
public static Camera.Size getLargestPictureSize(CameraHost host, | |
Camera.Parameters parameters, | |
boolean enforceProfile) { | |
Camera.Size result=null; | |
for (Camera.Size size : parameters.getSupportedPictureSizes()) { | |
// android.util.Log.d("CWAC-Camera", | |
// String.format("%d x %d", size.width, size.height)); | |
if (!enforceProfile | |
|| (size.height <= host.getDeviceProfile() | |
.getMaxPictureHeight() && size.height >= host.getDeviceProfile() | |
.getMinPictureHeight())) { | |
if (result == null) { | |
result=size; | |
} | |
else { | |
int resultArea=result.width * result.height; | |
int newArea=size.width * size.height; | |
if (newArea > resultArea) { | |
result=size; | |
} | |
} | |
} | |
} | |
if (result == null && enforceProfile) { | |
result=getLargestPictureSize(host, parameters, false); | |
} | |
return(result); | |
} | |
public static Camera.Size getSmallestPictureSize(Camera.Parameters parameters) { | |
Camera.Size result=null; | |
for (Camera.Size size : parameters.getSupportedPictureSizes()) { | |
if (result == null) { | |
result=size; | |
} | |
else { | |
int resultArea=result.width * result.height; | |
int newArea=size.width * size.height; | |
if (newArea < resultArea) { | |
result=size; | |
} | |
} | |
} | |
return(result); | |
} | |
public static String findBestFlashModeMatch(Camera.Parameters params, | |
String... modes) { | |
String match=null; | |
List<String> flashModes=params.getSupportedFlashModes(); | |
if (flashModes != null) { | |
for (String mode : modes) { | |
if (flashModes.contains(mode)) { | |
match=mode; | |
break; | |
} | |
} | |
} | |
return(match); | |
} | |
private static class SizeComparator implements | |
Comparator<Camera.Size> { | |
@Override | |
public int compare(Size lhs, Size rhs) { | |
int left=lhs.width * lhs.height; | |
int right=rhs.width * rhs.height; | |
if (left < right) { | |
return(-1); | |
} | |
else if (left > right) { | |
return(1); | |
} | |
return(0); | |
} | |
} | |
} |
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