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/*
* Copyright (C) 2011 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.camera.panorama;
import java.text.SimpleDateFormat;
import java.util.Date;
public class PanoUtil {
public static String createName(String format, long dateTaken) {
Date date = new Date(dateTaken);
SimpleDateFormat dateFormat = new SimpleDateFormat(format);
return dateFormat.format(date);
}
// TODO: Add comments about the range of these two arguments.
public static double calculateDifferenceBetweenAngles(double firstAngle,
double secondAngle) {
double difference1 = (secondAngle - firstAngle) % 360;
if (difference1 < 0) {
difference1 += 360;
}
double difference2 = (firstAngle - secondAngle) % 360;
if (difference2 < 0) {
difference2 += 360;
}
return Math.min(difference1, difference2);
}
public static void decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, ypd = 0; j < height; j += 4) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i += 4, ypd++) {
int y = (0xff & ((int) yuv420sp[j * width + i])) - 16;
if (y < 0) {
y = 0;
}
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
uvp += 2; // Skip the UV values for the 4 pixels skipped in between
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) {
r = 0;
} else if (r > 262143) {
r = 262143;
}
if (g < 0) {
g = 0;
} else if (g > 262143) {
g = 262143;
}
if (b < 0) {
b = 0;
} else if (b > 262143) {
b = 262143;
}
rgb[ypd] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) |
((b >> 10) & 0xff);
}
}
}
}
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