iipsrv  1.1
iipsrv is an advanced high-performance feature-rich image server for web-based streamed viewing and zooming of ultra high-resolution images
JPEGCompressor.h
1 /* JPEG class wrapper to ijg jpeg library
2 
3  Copyright (C) 2000-2018 Ruven Pillay.
4 
5  This program is free software; you can redistribute it and/or modify
6  it under the terms of the GNU General Public License as published by
7  the Free Software Foundation; either version 3 of the License, or
8  (at your option) any later version.
9 
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License
16  along with this program; if not, write to the Free Software Foundation,
17  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19 
20 
21 
22 #ifndef _JPEGCOMPRESSOR_H
23 #define _JPEGCOMPRESSOR_H
24 
25 
26 #include "Compressor.h"
27 
28 
29 // Fix missing snprintf in Windows
30 #if _MSC_VER
31 #define snprintf _snprintf
32 #endif
33 
34 
35 extern "C"{
36 /* Undefine this to prevent compiler warning
37  */
38 #undef HAVE_STDLIB_H
39 #include <jpeglib.h>
40 }
41 
42 
43 
45 
46 
47 typedef struct {
48  struct jpeg_destination_mgr pub;
50  size_t size;
51  JOCTET *buffer;
52  unsigned char* source;
53  unsigned int strip_height;
56 
58 
59 
60 
62 
63 class JPEGCompressor: public Compressor{
64 
65  private:
66 
68  unsigned int width, height, channels;
69 
71  int Q;
72 
74  unsigned char header[1024];
75 
77  unsigned char *data;
78 
80  unsigned int header_size;
81 
83  struct jpeg_compress_struct cinfo;
84  struct jpeg_error_mgr jerr;
85  iip_destination_mgr dest_mgr;
86  iip_dest_ptr dest;
87 
89  void writeICCProfile();
90 
92  void writeXMPMetadata();
93 
94 
95  public:
96 
98 
99  JPEGCompressor( int quality ) { Q = quality; dest = NULL; };
100 
101 
103 
104  inline void setQuality( int factor ) {
105  if( factor < 0 ) Q = 0;
106  else if( factor > 100 ) Q = 100;
107  else Q = factor;
108  };
109 
110 
112  inline int getQuality() { return Q; }
113 
114 
116 
123  void InitCompression( const RawTile& rawtile, unsigned int strip_height );
124 
126 
130  unsigned int CompressStrip( unsigned char* s, unsigned char* o, unsigned int tile_height );
131 
133 
136  unsigned int Finish( unsigned char* output );
137 
139 
140  unsigned int Compress( RawTile& t );
141 
143  inline unsigned int getHeaderSize() { return header_size; }
144 
146  inline unsigned char* getHeader() { return header; }
147 
149  inline const char* getMimeType(){ return "image/jpeg"; }
150 
152  inline const char* getSuffix(){ return "jpg"; }
153 
154 };
155 
156 
157 #endif
unsigned int Compress(RawTile &t)
Compress an entire buffer of image data at once in one command.
const char * getSuffix()
Return the image filename suffix.
Definition: JPEGCompressor.h:152
unsigned int CompressStrip(unsigned char *s, unsigned char *o, unsigned int tile_height)
Compress a strip of image data.
Wrapper class to the IJG JPEG library.
Definition: JPEGCompressor.h:63
Expanded data destination object for buffered output used by IJG JPEG library.
Definition: JPEGCompressor.h:47
const char * getMimeType()
Return the JPEG mime type.
Definition: JPEGCompressor.h:149
unsigned int Finish(unsigned char *output)
Finish the strip based compression and free memory.
unsigned int strip_height
Definition: JPEGCompressor.h:53
unsigned char * source
Definition: JPEGCompressor.h:52
void setQuality(int factor)
Set the compression quality.
Definition: JPEGCompressor.h:104
Base class for IIP output images.
Definition: Compressor.h:32
JPEGCompressor(int quality)
Constructor.
Definition: JPEGCompressor.h:99
size_t size
Definition: JPEGCompressor.h:50
unsigned int getHeaderSize()
Return the JPEG header size.
Definition: JPEGCompressor.h:143
void InitCompression(const RawTile &rawtile, unsigned int strip_height)
Initialise strip based compression.
unsigned char * getHeader()
Return a pointer to the header itself.
Definition: JPEGCompressor.h:146
Class to represent a single image tile.
Definition: RawTile.h:45
int getQuality()
Get the current quality level.
Definition: JPEGCompressor.h:112
JOCTET * buffer
Definition: JPEGCompressor.h:51