1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.camera.panorama;
18 
19 import java.text.SimpleDateFormat;
20 import java.util.Date;
21 
22 public class PanoUtil {
createName(String format, long dateTaken)23     public static String createName(String format, long dateTaken) {
24         Date date = new Date(dateTaken);
25         SimpleDateFormat dateFormat = new SimpleDateFormat(format);
26         return dateFormat.format(date);
27     }
28 
29     // TODO: Add comments about the range of these two arguments.
calculateDifferenceBetweenAngles(double firstAngle, double secondAngle)30     public static double calculateDifferenceBetweenAngles(double firstAngle,
31             double secondAngle) {
32         double difference1 = (secondAngle - firstAngle) % 360;
33         if (difference1 < 0) {
34             difference1 += 360;
35         }
36 
37         double difference2 = (firstAngle - secondAngle) % 360;
38         if (difference2 < 0) {
39             difference2 += 360;
40         }
41 
42         return Math.min(difference1, difference2);
43     }
44 
decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp, int width, int height)45     public static void decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp, int width, int height) {
46         final int frameSize = width * height;
47 
48         for (int j = 0, ypd = 0; j < height; j += 4) {
49             int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
50             for (int i = 0; i < width; i += 4, ypd++) {
51                 int y = (0xff & ((int) yuv420sp[j * width + i])) - 16;
52                 if (y < 0) {
53                     y = 0;
54                 }
55                 if ((i & 1) == 0) {
56                     v = (0xff & yuv420sp[uvp++]) - 128;
57                     u = (0xff & yuv420sp[uvp++]) - 128;
58                     uvp += 2;  // Skip the UV values for the 4 pixels skipped in between
59                 }
60                 int y1192 = 1192 * y;
61                 int r = (y1192 + 1634 * v);
62                 int g = (y1192 - 833 * v - 400 * u);
63                 int b = (y1192 + 2066 * u);
64 
65                 if (r < 0) {
66                     r = 0;
67                 } else if (r > 262143) {
68                     r = 262143;
69                 }
70                 if (g < 0) {
71                     g = 0;
72                 } else if (g > 262143) {
73                     g = 262143;
74                 }
75                 if (b < 0) {
76                     b = 0;
77                 } else if (b > 262143) {
78                     b = 262143;
79                 }
80 
81                 rgb[ypd] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) |
82                         ((b >> 10) & 0xff);
83             }
84         }
85     }
86 }
87