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
|
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "decode.h"
#ifdef WIN32
/* We need some hacks to avoid warnings from the jpeg headers, ex: */
/* #define HAVE_BOOLEAN */
#define XMD_H
/* #undef FAR */
/* but they are not compatible: uchar vs int........!@@(#$$??!@! */
/* fix this with UGLY HACK! */
/* #define boolean spice_jpeg_boolean */
/* #define INT32 spice_jpeg_int32 */
#endif
#include <stdio.h>
#include <jpeglib.h>
typedef struct GlibJpegDecoder
{
SpiceJpegDecoder base;
struct jpeg_decompress_struct _cinfo;
struct jpeg_error_mgr _jerr;
struct jpeg_source_mgr _jsrc;
uint8_t* _data;
int _data_size;
int _width;
int _height;
} GlibJpegDecoder;
static void begin_decode(SpiceJpegDecoder *decoder,
uint8_t* data, int data_size,
int* out_width, int* out_height)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
g_return_if_fail(data != NULL);
g_return_if_fail(data_size != 0);
if (d->_data)
jpeg_abort_decompress(&d->_cinfo);
d->_data = data;
d->_data_size = data_size;
d->_cinfo.src->next_input_byte = d->_data;
d->_cinfo.src->bytes_in_buffer = d->_data_size;
jpeg_read_header(&d->_cinfo, TRUE);
d->_cinfo.out_color_space = JCS_RGB;
d->_width = d->_cinfo.image_width;
d->_height = d->_cinfo.image_height;
*out_width = d->_width;
*out_height = d->_height;
}
/* TODO: move it elsewhere and reuse it in get_pixbuf(), optimize? */
typedef void (*converter_rgb_t)(uint8_t* src, uint8_t* dest, int width);
static void convert_rgb_to_bgr(uint8_t* src, uint8_t* dest, int width)
{
int x;
for (x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
src += 3;
}
}
static void convert_rgb_to_bgrx(uint8_t* src, uint8_t* dest, int width)
{
int x;
for (x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
*dest++ = 0;
src += 3;
}
}
static void decode(SpiceJpegDecoder *decoder,
uint8_t* dest, int stride, int format)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
uint8_t* scan_line = g_alloca(d->_width * 3);
converter_rgb_t converter = NULL;
int row;
switch (format) {
case SPICE_BITMAP_FMT_24BIT:
converter = convert_rgb_to_bgr;
break;
case SPICE_BITMAP_FMT_32BIT:
converter = convert_rgb_to_bgrx;
break;
default:
g_warning("bad bitmap format, %d", format);
return;
}
g_return_if_fail(converter != NULL);
jpeg_start_decompress(&d->_cinfo);
for (row = 0; row < d->_height; row++) {
jpeg_read_scanlines(&d->_cinfo, &scan_line, 1);
converter(scan_line, dest, d->_width);
dest += stride;
}
jpeg_finish_decompress(&d->_cinfo);
}
static SpiceJpegDecoderOps jpeg_decoder_ops = {
.begin_decode = begin_decode,
.decode = decode,
};
static void jpeg_decoder_init_source(j_decompress_ptr cinfo)
{
}
static boolean jpeg_decoder_fill_input_buffer(j_decompress_ptr cinfo)
{
g_warning("no more data for jpeg");
return FALSE;
}
static void jpeg_decoder_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
g_return_if_fail(num_bytes < (long)cinfo->src->bytes_in_buffer);
cinfo->src->next_input_byte += num_bytes;
cinfo->src->bytes_in_buffer -= num_bytes;
}
static void jpeg_decoder_term_source (j_decompress_ptr cinfo)
{
return;
}
SpiceJpegDecoder *jpeg_decoder_new(void)
{
GlibJpegDecoder *d = spice_new0(GlibJpegDecoder, 1);
d->_cinfo.err = jpeg_std_error(&d->_jerr);
jpeg_create_decompress(&d->_cinfo);
d->_cinfo.src = &d->_jsrc;
d->_cinfo.src->init_source = jpeg_decoder_init_source;
d->_cinfo.src->fill_input_buffer = jpeg_decoder_fill_input_buffer;
d->_cinfo.src->skip_input_data = jpeg_decoder_skip_input_data;
d->_cinfo.src->resync_to_restart = jpeg_resync_to_restart;
d->_cinfo.src->term_source = jpeg_decoder_term_source;
d->base.ops = &jpeg_decoder_ops;
return &d->base;
}
void jpeg_decoder_destroy(SpiceJpegDecoder *decoder)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
jpeg_destroy_decompress(&d->_cinfo);
free(d);
}
|
