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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
//========================================================================
//
// JPEG2000Stream.cc
//
// A JPX stream decoder using OpenJPEG
//
// Copyright 2008, 2009 Albert Astals Cid <aacid@kde.org>
//
// Licensed under GPLv2 or later
//
//========================================================================
#include "JPEG2000Stream.h"
JPXStream::JPXStream(Stream *strA) : FilterStream(strA)
{
inited = gFalse;
image = NULL;
dinfo = NULL;
}
JPXStream::~JPXStream() {
delete str;
close();
}
void JPXStream::reset() {
counter = 0;
}
void JPXStream::close() {
if (image != NULL) {
opj_image_destroy(image);
image = NULL;
}
if (dinfo != NULL) {
opj_destroy_decompress(dinfo);
dinfo = NULL;
}
}
int JPXStream::getPos() {
return counter;
}
int JPXStream::getChar() {
int result = lookChar();
++counter;
return result;
}
#define BUFFER_INCREASE 4096
void JPXStream::init()
{
Object oLen;
if (getDict()) getDict()->lookup("Length", &oLen);
int bufSize = BUFFER_INCREASE;
if (oLen.isInt()) bufSize = oLen.getInt();
oLen.free();
unsigned char *buf = (unsigned char*)gmallocn(bufSize, sizeof(unsigned char));
int index = 0;
str->reset();
int c = str->getChar();
while(c != EOF)
{
if (index >= bufSize)
{
bufSize += BUFFER_INCREASE;
buf = (unsigned char*)greallocn(buf, bufSize, sizeof(unsigned char));
}
buf[index] = c;
++index;
c = str->getChar();
}
init2(buf, index, CODEC_JP2);
free(buf);
counter = 0;
inited = gTrue;
}
static void libopenjpeg_error_callback(const char *msg, void * /*client_data*/) {
error(-1, "%s", msg);
}
static void libopenjpeg_warning_callback(const char *msg, void * /*client_data*/) {
error(-1, "%s", msg);
}
void JPXStream::init2(unsigned char *buf, int bufLen, OPJ_CODEC_FORMAT format)
{
opj_cio_t *cio = NULL;
/* Use default decompression parameters */
opj_dparameters_t parameters;
opj_set_default_decoder_parameters(¶meters);
/* Configure the event manager to receive errors and warnings */
opj_event_mgr_t event_mgr;
memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
event_mgr.error_handler = libopenjpeg_error_callback;
event_mgr.warning_handler = libopenjpeg_warning_callback;
/* Get the decoder handle of the format */
dinfo = opj_create_decompress(format);
if (dinfo == NULL) goto error;
/* Catch events using our callbacks */
opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, NULL);
/* Setup the decoder decoding parameters */
opj_setup_decoder(dinfo, ¶meters);
/* Open a byte stream */
cio = opj_cio_open((opj_common_ptr)dinfo, buf, bufLen);
if (cio == NULL) goto error;
/* Decode the stream and fill the image structure */
image = opj_decode(dinfo, cio);
/* Close the byte stream */
opj_cio_close(cio);
if (image == NULL) goto error;
else return;
error:
if (format == CODEC_JP2) {
error(-1, "Did no succeed opening JPX Stream as JP2, trying as J2K.");
init2(buf, bufLen, CODEC_J2K);
} else if (format == CODEC_J2K) {
error(-1, "Did no succeed opening JPX Stream as J2K, trying as JPT.");
init2(buf, bufLen, CODEC_JPT);
} else {
error(-1, "Did no succeed opening JPX Stream.");
}
}
int JPXStream::lookChar() {
if (inited == gFalse) init();
if (!image) return EOF;
int w = image->comps[0].w;
int h = image->comps[0].h;
int y = (counter / image->numcomps) / w;
int x = (counter / image->numcomps) % w;
if (y >= h) return EOF;
int component = counter % image->numcomps;
int adjust = 0;
if (image->comps[component].prec > 8) {
adjust = image->comps[component].prec - 8;
}
int r = image->comps[component].data[y * w + x];
r += (image->comps[component].sgnd ? 1 << (image->comps[0].prec - 1) : 0);
unsigned char rc = (unsigned char) ((r >> adjust)+((r >> (adjust-1))%2));
return rc;
}
GooString *JPXStream::getPSFilter(int psLevel, char *indent) {
return NULL;
}
GBool JPXStream::isBinary(GBool last) {
return str->isBinary(gTrue);
}
void JPXStream::getImageParams(int *bitsPerComponent, StreamColorSpaceMode *csMode) {
if (inited == gFalse) init();
*bitsPerComponent = 8;
if (image && image->numcomps == 3) *csMode = streamCSDeviceRGB;
else *csMode = streamCSDeviceGray;
}
|
