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///////////////////////////////////////////////////
18// ImageUtils.h
19// $Id: ImageUtils.h,v 1.9 2011/05/16 15:33:06 mbansal Exp $
20
21#ifndef IMAGE_UTILS_H
22#define IMAGE_UTILS_H
23
24#include <stdlib.h>
25
26/**
27 *  Definition of basic image types
28 */
29typedef unsigned char ImageTypeBase;
30typedef ImageTypeBase *ImageType;
31
32typedef short ImageTypeShortBase;
33typedef ImageTypeShortBase *ImageTypeShort;
34
35typedef float ImageTypeFloatBase;
36typedef ImageTypeFloatBase *ImageTypeFloat;
37
38
39class ImageUtils {
40public:
41
42  /**
43   *  Default number of channels in image.
44   */
45  static const int IMAGE_TYPE_NUM_CHANNELS = 3;
46
47  /**
48   *  Definition of an empty image.
49   */
50  static const int IMAGE_TYPE_NOIMAGE = NULL;
51
52  /**
53   *  Convert image from BGR (interlaced) to YVU (non-interlaced)
54   *
55   *  Arguments:
56   *    out: Resulting image (note must be preallocated before
57   *    call)
58   *    in: Input image
59   *    width: Width of input image
60   *    height: Height of input image
61   */
62  static void rgb2yvu(ImageType out, ImageType in, int width, int height);
63
64  static void rgba2yvu(ImageType out, ImageType in, int width, int height);
65
66  /**
67   *  Convert image from YVU (non-interlaced) to BGR (interlaced)
68   *
69   *  Arguments:
70   *    out: Resulting image (note must be preallocated before
71   *    call)
72   *    in: Input image
73   *    width: Width of input image
74   *    height: Height of input image
75   */
76  static void yvu2rgb(ImageType out, ImageType in, int width, int height);
77  static void yvu2bgr(ImageType out, ImageType in, int width, int height);
78
79  /**
80   *  Convert image from BGR to grayscale
81   *
82   *  Arguments:
83   *    in: Input image
84   *    width: Width of input image
85   *    height: Height of input image
86   *
87   *  Return:
88   *    Pointer to resulting image (allocation is done here, free
89   *    must be done by caller)
90   */
91  static ImageType rgb2gray(ImageType in, int width, int height);
92  static ImageType rgb2gray(ImageType out, ImageType in, int width, int height);
93
94  /**
95   *  Read a binary PPM image
96   */
97  static ImageType readBinaryPPM(const char *filename, int &width, int &height);
98
99  /**
100   *  Write a binary PPM image
101   */
102  static void writeBinaryPPM(ImageType image, const char *filename, int width, int height, int numChannels = IMAGE_TYPE_NUM_CHANNELS);
103
104  /**
105   *  Allocate space for a standard image.
106   */
107  static ImageType allocateImage(int width, int height, int numChannels, short int border = 0);
108
109  /**
110   *  Free memory of image
111   */
112  static void freeImage(ImageType image);
113
114  static ImageType *imageTypeToRowPointers(ImageType out, int width, int height);
115  /**
116   *  Get time.
117   */
118  static double getTime();
119
120protected:
121
122  /**
123  *  Constants for YVU/RGB conversion
124  */
125  static const int REDY = 257;
126  static const int REDV = 439;
127  static const int REDU = 148;
128  static const int GREENY = 504;
129  static const int GREENV = 368;
130  static const int GREENU = 291;
131  static const int BLUEY = 98;
132  static const int BLUEV = 71;
133  static const int BLUEU = 439;
134
135};
136
137/**
138 * Structure containing an image and other bookkeeping items.
139 * Used in YUVinfo to store separate YVU image planes.
140 */
141typedef struct {
142  ImageType *ptr;
143  unsigned short width;
144  unsigned short height;
145  unsigned short border;
146  unsigned short pitch;
147} BimageInfo;
148
149/**
150 * A YUV image container,
151 */
152class YUVinfo {
153public:
154  static YUVinfo *allocateImage(unsigned short width, unsigned short height);
155  static void mapYUVInfoToImage(YUVinfo *img, unsigned char *position);
156
157  /**
158  * Y Plane
159  */
160  BimageInfo Y;
161
162  /**
163  *  V (1st color) plane
164  */
165  BimageInfo V;
166
167  /**
168  *  U (1st color) plane
169  */
170  BimageInfo U;
171};
172
173#endif
174