1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
render/jpgfile.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
/*
Notes:
http://www.zarb.org/~gc/html/libpng.html
*/
#include <cstring>
#include <iostream>
#include "sys/sys.h"
#include "filesystem/filesystem.h"
#include "render/jpgfile.h"
// work-around for a jpeglib problem, needed on win32 and osx
#ifdef HAVE_STDLIB_H
#undef HAVE_STDLIB_H
#endif
extern "C" {
#include "jpeglib.h"
}
namespace render
{
Image *JPG::load(const char *filename)
{
struct jpeg_decompress_struct jpeg_decompression_info;
struct jpeg_error_mgr jerr;
int row_stride = 0;
Image *image = 0;
if (!filename)
return 0;
filesystem::File *jpg_file = filesystem::open(filename);
if (!jpg_file) {
//con_warn << "Could not open " << filename << std::endl;
return 0;
}
// initialize decompression structures
jpeg_decompression_info.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&jpeg_decompression_info);
jpeg_stdio_src(&jpeg_decompression_info, jpg_file->handle());
// read JPEG header
jpeg_read_header(&jpeg_decompression_info, TRUE);
jpeg_start_decompress(&jpeg_decompression_info);
row_stride = jpeg_decompression_info.output_width * jpeg_decompression_info.output_components;
image = new Image(jpeg_decompression_info.output_width,
jpeg_decompression_info.output_height,
jpeg_decompression_info.output_components);
// read pixel data
JSAMPLE *row_pointer;
while (jpeg_decompression_info.output_scanline < jpeg_decompression_info.output_height) {
row_pointer = (*image)[jpeg_decompression_info.output_scanline*row_stride];
jpeg_read_scanlines(&jpeg_decompression_info, &row_pointer, 1);
}
jpeg_finish_decompress(&jpeg_decompression_info);
// destroy decompression structures
jpeg_destroy_decompress(&jpeg_decompression_info);
filesystem::close(jpg_file);
con_debug << " " << filename << " " << image->width() << "x" << image->height() << "x" << image->bpp() << "bpp" << std::endl;
return image;
}
void JPG::save(const char *filename, Image & image, int jpeg_quality)
{
struct jpeg_compress_struct jpeg_compression_info;
struct jpeg_error_mgr jerr;
JSAMPROW row_pointer[1];
int row_stride;
FILE *jpg_file = fopen(filename, "wb");
if (!jpg_file) {
con_warn << "Could not write " << filename << std::endl;
return;
}
jpeg_compression_info.err = jpeg_std_error(&jerr);
jpeg_create_compress(&jpeg_compression_info);
jpeg_stdio_dest(&jpeg_compression_info, jpg_file);
jpeg_compression_info.image_width = image.width();
jpeg_compression_info.image_height = image.height();
jpeg_compression_info.input_components = image.channels();
jpeg_compression_info.in_color_space = JCS_RGB;
jpeg_set_defaults(&jpeg_compression_info);
jpeg_set_quality(&jpeg_compression_info, jpeg_quality, TRUE);
jpeg_start_compress(&jpeg_compression_info, TRUE);
row_stride = image.width() * image.channels();
while (jpeg_compression_info.next_scanline < jpeg_compression_info.image_height) {
row_pointer[0] = image[jpeg_compression_info.next_scanline * row_stride];
jpeg_write_scanlines(&jpeg_compression_info, row_pointer, 1);
}
jpeg_finish_compress(&jpeg_compression_info);
fclose(jpg_file);
jpeg_destroy_compress(&jpeg_compression_info);
//con_print << "Wrote " << filename << std::endl;
}
}
|
