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
|
#include <qpdf/Pl_DCT.hh>
#include <qpdf/Pl_StdioFile.hh>
#include <qpdf/QUtil.hh>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
static void
usage()
{
std::cerr << "Usage: dct_compress infile outfile width height {rgb|cmyk|gray}" << std::endl;
exit(2);
}
class Callback: public Pl_DCT::CompressConfig
{
public:
Callback() = default;
~Callback() override = default;
void apply(jpeg_compress_struct*) override;
bool called{false};
};
void
Callback::apply(jpeg_compress_struct*)
{
this->called = true;
}
int
main(int argc, char* argv[])
{
if (argc != 6) {
usage();
}
char* infilename = argv[1];
char* outfilename = argv[2];
JDIMENSION width = QUtil::string_to_uint(argv[3]);
JDIMENSION height = QUtil::string_to_uint(argv[4]);
char* colorspace = argv[5];
J_COLOR_SPACE cs =
((strcmp(colorspace, "rgb") == 0) ? JCS_RGB
: (strcmp(colorspace, "cmyk") == 0) ? JCS_CMYK
: (strcmp(colorspace, "gray") == 0) ? JCS_GRAYSCALE
: JCS_UNKNOWN);
int components = 0;
switch (cs) {
case JCS_RGB:
components = 3;
break;
case JCS_CMYK:
components = 4;
break;
case JCS_GRAYSCALE:
components = 1;
break;
default:
usage();
break;
}
FILE* infile = QUtil::safe_fopen(infilename, "rb");
FILE* outfile = QUtil::safe_fopen(outfilename, "wb");
Pl_StdioFile out("stdout", outfile);
unsigned char buf[100];
bool done = false;
Callback callback;
Pl_DCT dct("dct", &out, width, height, components, cs, &callback);
while (!done) {
size_t len = fread(buf, 1, sizeof(buf), infile);
if (len <= 0) {
done = true;
} else {
dct.write(buf, len);
}
}
dct.finish();
if (!callback.called) {
std::cout << "Callback was not called" << std::endl;
}
fclose(infile);
fclose(outfile);
return 0;
}
|
