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
|
/*
Copyright (C) 2009 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/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "common.h"
#include "jpeg_decoder.h"
#include "debug.h"
#include "utils.h"
#if !defined(jpeg_boolean)
#define jpeg_boolean boolean
#endif
static void op_begin_decode(SpiceJpegDecoder *decoder,
uint8_t* data,
int data_size,
int* out_width,
int* out_height)
{
JpegDecoder* _decoder = static_cast<JpegDecoder*>(decoder);
_decoder->begin_decode(data, data_size, *out_width, *out_height);
}
static void op_decode(SpiceJpegDecoder *decoder,
uint8_t* dest,
int stride,
int format)
{
JpegDecoder* _decoder = static_cast<JpegDecoder*>(decoder);
_decoder->decode(dest, stride, format);
}
extern "C" {
static void jpeg_decoder_init_source(j_decompress_ptr cinfo)
{
}
static SPICE_GNUC_NORETURN jpeg_boolean jpeg_decoder_fill_input_buffer(j_decompress_ptr cinfo)
{
PANIC("no more data for jpeg");
}
static void jpeg_decoder_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
ASSERT(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;
}
}
JpegDecoder::JpegDecoder()
: _data (NULL)
, _data_size (0)
{
_cinfo.err = jpeg_std_error(&_jerr);
jpeg_create_decompress(&_cinfo);
_cinfo.src = &_jsrc;
_cinfo.src->init_source = jpeg_decoder_init_source;
_cinfo.src->fill_input_buffer = jpeg_decoder_fill_input_buffer;
_cinfo.src->skip_input_data = jpeg_decoder_skip_input_data;
_cinfo.src->resync_to_restart = jpeg_resync_to_restart;
_cinfo.src->term_source = jpeg_decoder_term_source;
static SpiceJpegDecoderOps decoder_ops = {
op_begin_decode,
op_decode,
};
ops = &decoder_ops;
}
JpegDecoder::~JpegDecoder()
{
jpeg_destroy_decompress(&_cinfo);
}
void JpegDecoder::begin_decode(uint8_t* data, int data_size, int& out_width, int& out_height)
{
ASSERT(data);
ASSERT(data_size);
if (_data) {
jpeg_abort_decompress(&_cinfo);
}
_data = data;
_data_size = data_size;
_cinfo.src->next_input_byte = _data;
_cinfo.src->bytes_in_buffer = _data_size;
jpeg_read_header(&_cinfo, TRUE);
_cinfo.out_color_space = JCS_RGB;
_width = _cinfo.image_width;
_height = _cinfo.image_height;
out_width = _width;
out_height = _height;
}
void JpegDecoder::decode(uint8_t *dest, int stride, int format)
{
uint8_t* scan_line = new uint8_t[_width*3];
RGBConverter* rgb_converter;
switch (format) {
case SPICE_BITMAP_FMT_24BIT:
rgb_converter = &_rgb2bgr;
break;
case SPICE_BITMAP_FMT_32BIT:
rgb_converter = &_rgb2bgrx;
break;
default:
THROW("bad bitmap format, %d", format);
}
jpeg_start_decompress(&_cinfo);
for (int row = 0; row < _height; row++) {
jpeg_read_scanlines(&_cinfo, &scan_line, 1);
rgb_converter->convert(scan_line, dest, _width);
dest += stride;
}
delete [] scan_line;
jpeg_finish_decompress(&_cinfo);
}
|
