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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/* Copyright (C) 2001-2023 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
CA 94129, USA, for further information.
*/
/* DCT encoding filter stream */
#include "memory_.h"
#include "stdio_.h"
#include "jpeglib_.h"
#include "jerror_.h"
#include "gdebug.h"
#include "gsmemory.h"
#include "strimpl.h"
#include "sdct.h"
#include "sjpeg.h"
#define ICC_OVERHEAD 16
#define MAX_MARKER_DATA_SIZE (65535 - ICC_OVERHEAD)
public_st_jpeg_compress_data();
/* ------ DCTEncode ------ */
/* JPEG destination manager procedures */
static void
dcte_init_destination(j_compress_ptr cinfo)
{
}
static boolean
dcte_empty_output_buffer(j_compress_ptr cinfo)
{
return FALSE;
}
static void
dcte_term_destination(j_compress_ptr cinfo)
{
}
/* Set the defaults for the DCTEncode filter. */
static void
s_DCTE_set_defaults(stream_state * st)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
s_DCT_set_defaults(st);
ss->QFactor = 1.0;
ss->ColorTransform = -1;
ss->Markers.data = 0;
ss->Markers.size = 0;
ss->NoMarker = true;
}
/* Initialize DCTEncode filter */
static int
s_DCTE_init(stream_state * st)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
struct jpeg_destination_mgr *dest = &ss->data.compress->destination;
dest->init_destination = dcte_init_destination;
dest->empty_output_buffer = dcte_empty_output_buffer;
dest->term_destination = dcte_term_destination;
ss->data.common->memory = ss->jpeg_memory;
ss->data.compress->cinfo.dest = dest;
ss->phase = 0;
ss->icc_marker = 0;
ss->icc_position = -1;
return 0;
}
/* Process a buffer */
static int
s_DCTE_process(stream_state * st, stream_cursor_read * pr,
stream_cursor_write * pw, bool last)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
jpeg_compress_data *jcdp = ss->data.compress;
struct jpeg_destination_mgr *dest = jcdp->cinfo.dest;
if_debug2m('w', st->memory, "[wde]process avail=%u, last=%d\n",
(uint) (pr->limit - pr->ptr), last);
dest->next_output_byte = pw->ptr + 1;
dest->free_in_buffer = pw->limit - pw->ptr;
switch (ss->phase) {
case 0: /* not initialized yet */
if (gs_jpeg_start_compress(ss, TRUE) < 0)
return ERRC;
if_debug4m('w', st->memory, "[wde]width=%u, height=%u, components=%d, scan_line_size=%u\n",
jcdp->cinfo.image_width,
jcdp->cinfo.image_height,
jcdp->cinfo.input_components,
ss->scan_line_size);
pw->ptr = dest->next_output_byte - 1;
ss->phase = 1;
/* falls through */
case 1: /* initialized, Markers not written */
if (pw->limit - pw->ptr < ss->Markers.size)
return 1;
memcpy(pw->ptr + 1, ss->Markers.data, ss->Markers.size);
pw->ptr += ss->Markers.size;
ss->phase = 2;
/* falls through */
case 2: /* still need to write Adobe marker */
if (!ss->NoMarker) {
static const byte Adobe[] =
{
0xFF, JPEG_APP0 + 14, 0, 14, /* parameter length */
'A', 'd', 'o', 'b', 'e',
0, 100, /* Version */
0, 0, /* Flags0 */
0, 0, /* Flags1 */
0 /* ColorTransform */
};
#define ADOBE_MARKER_LEN sizeof(Adobe)
if (pw->limit - pw->ptr < ADOBE_MARKER_LEN)
return 1;
memcpy(pw->ptr + 1, Adobe, ADOBE_MARKER_LEN);
pw->ptr += ADOBE_MARKER_LEN;
*pw->ptr = ss->ColorTransform;
#undef ADOBE_MARKER_LEN
}
dest->next_output_byte = pw->ptr + 1;
dest->free_in_buffer = pw->limit - pw->ptr;
ss->phase = 3;
/* falls through */
case 3:
/* If we have it, then write out the ICC profile */
/* Due to size limitations allowed in APP0 markers, the profile
may have to be written in mutiple markers */
if (ss->icc_profile != NULL) {
static const char marker[2] = {0xFF, 0xE2}; /* JPEG_APP0 + 2 */
byte num_mark;
/* Number of markers */
num_mark = ss->icc_profile->buffer_size / MAX_MARKER_DATA_SIZE;
if (num_mark * MAX_MARKER_DATA_SIZE < ss->icc_profile->buffer_size) {
num_mark++;
}
while (ss->icc_marker < num_mark) {
ulong offset = ss->icc_marker * MAX_MARKER_DATA_SIZE;
ulong size;
size = ss->icc_profile->buffer_size - offset;
if (size > MAX_MARKER_DATA_SIZE)
size = MAX_MARKER_DATA_SIZE;
/* In this case we are just getting started with the
header of the marker. Write that portion out */
if (ss->icc_position == -1) {
byte length_byte[2];
byte curr_mark = ss->icc_marker + 1;
ulong total_length;
if ((uint) (pw->limit - pw->ptr) < (sizeof(marker) + ICC_OVERHEAD))
return 1;
total_length = size + ICC_OVERHEAD;
memcpy(pw->ptr + 1, marker, sizeof(marker));
length_byte[0] = total_length >> 8;
length_byte[1] = total_length & 0xFF;
memcpy(pw->ptr + 3, length_byte, sizeof(length_byte));
memcpy(pw->ptr + 5, "ICC_PROFILE", 12); /* Null included */
memcpy(pw->ptr + 17, &curr_mark, 1);
memcpy(pw->ptr + 18, &num_mark, 1);
pw->ptr += sizeof(marker) + ICC_OVERHEAD;
ss->icc_position = 0;
}
/* Now write out the actual profile data */
while (ss->icc_position < size) {
ulong avail_bytes, num_bytes;
avail_bytes = (ulong) (pw->limit - pw->ptr);
if (avail_bytes == 0)
return 1;
num_bytes = (size - ss->icc_position);
if (num_bytes > avail_bytes)
num_bytes = avail_bytes;
memcpy(pw->ptr + 1, ss->icc_profile->buffer + offset + ss->icc_position, num_bytes);
ss->icc_position += num_bytes;
pw->ptr += num_bytes;
}
/* Move on to the next marker */
++ss->icc_marker;
ss->icc_position = -1;
}
dest->next_output_byte = pw->ptr + 1;
dest->free_in_buffer = pw->limit - pw->ptr;
}
ss->phase = 4;
/* falls through */
case 4: /* markers written, processing data */
while (jcdp->cinfo.image_height > jcdp->cinfo.next_scanline) {
int written;
/*
* The data argument for jpeg_write_scanlines is
* declared as a JSAMPARRAY. There is no corresponding
* const type, so we must remove const from the
* argument that we are passing here. (Tom Lane of IJG
* judges that providing const analogues of the
* interface types wouldn't be worth the trouble.)
*/
/*const */ byte *samples = (byte *) (pr->ptr + 1);
if_debug1m('w', st->memory, "[wde]next_scanline=%u\n",
jcdp->cinfo.next_scanline);
if ((uint) (pr->limit - pr->ptr) < ss->scan_line_size) {
if (last)
return ERRC; /* premature EOD */
return 0; /* need more data */
}
written = gs_jpeg_write_scanlines(ss, &samples, 1);
if (written < 0)
return ERRC;
if_debug3m('w', st->memory, "[wde]write returns %d, used=%u, written=%u\n",
written,
(uint) (samples - 1 - pr->ptr),
(uint) (dest->next_output_byte - 1 - pw->ptr));
pw->ptr = dest->next_output_byte - 1;
if (!written)
return 1; /* output full */
pr->ptr += ss->scan_line_size;
}
ss->phase = 5;
/* falls through */
case 5: /* all data processed, finishing */
/* jpeg_finish_compress can't suspend, so write its output
* to a fixed-size internal buffer.
*/
dest->next_output_byte = jcdp->finish_compress_buf;
dest->free_in_buffer = sizeof(jcdp->finish_compress_buf);
if (gs_jpeg_finish_compress(ss) < 0)
return ERRC;
jcdp->fcb_size =
dest->next_output_byte - jcdp->finish_compress_buf;
jcdp->fcb_pos = 0;
ss->phase = 6;
/* falls through */
case 6: /* copy the final data to the output */
if (jcdp->fcb_pos < jcdp->fcb_size) {
int count = min(jcdp->fcb_size - jcdp->fcb_pos,
pw->limit - pw->ptr);
if_debug1m('w', st->memory, "[wde]copying final %d\n", count);
memcpy(pw->ptr + 1, jcdp->finish_compress_buf + jcdp->fcb_pos,
count);
jcdp->fcb_pos += count;
pw->ptr += count;
if (jcdp->fcb_pos < jcdp->fcb_size)
return 1;
}
return EOFC;
}
/* Default case can't happen.... */
return ERRC;
}
/* Stream template */
const stream_template s_DCTE_template =
{&st_DCT_state, s_DCTE_init, s_DCTE_process, 1000, 4000, NULL,
s_DCTE_set_defaults
};
|
