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
|
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// ZRLE decoding function.
//
// This file is #included after having set the following macro:
// BPP - 8, 16 or 32
#include <stdio.h>
#include <rdr/InStream.h>
#include <rdr/ZlibInStream.h>
#include <rfb/Exception.h>
namespace rfb {
// CONCAT2E concatenates its arguments, expanding them if they are macros
#ifndef CONCAT2E
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#endif
#ifdef CPIXEL
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#define READ_PIXEL(is) CONCAT2E(readOpaque,CPIXEL)(is)
#define ZRLE_DECODE CONCAT2E(zrleDecode,CPIXEL)
#else
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#define READ_PIXEL(is) is->CONCAT2E(readOpaque,BPP)()
#define ZRLE_DECODE CONCAT2E(zrleDecode,BPP)
#endif
void ZRLE_DECODE (const Rect& r, rdr::InStream* is,
rdr::ZlibInStream* zis, PIXEL_T* buf,
CMsgHandler* handler)
{
int length = is->readU32();
zis->setUnderlying(is, length);
Rect t;
for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 64) {
t.br.y = __rfbmin(r.br.y, t.tl.y + 64);
for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 64) {
t.br.x = __rfbmin(r.br.x, t.tl.x + 64);
int mode = zis->readU8();
bool rle = mode & 128;
int palSize = mode & 127;
PIXEL_T palette[128];
for (int i = 0; i < palSize; i++) {
palette[i] = READ_PIXEL(zis);
}
if (palSize == 1) {
PIXEL_T pix = palette[0];
handler->fillRect(t, pix);
continue;
}
if (!rle) {
if (palSize == 0) {
// raw
#ifdef CPIXEL
for (PIXEL_T* ptr = buf; ptr < buf+t.area(); ptr++) {
*ptr = READ_PIXEL(zis);
}
#else
zis->readBytes(buf, t.area() * (BPP / 8));
#endif
} else {
// packed pixels
int bppp = ((palSize > 16) ? 8 :
((palSize > 4) ? 4 : ((palSize > 2) ? 2 : 1)));
PIXEL_T* ptr = buf;
for (int i = 0; i < t.height(); i++) {
PIXEL_T* eol = ptr + t.width();
rdr::U8 byte = 0;
rdr::U8 nbits = 0;
while (ptr < eol) {
if (nbits == 0) {
byte = zis->readU8();
nbits = 8;
}
nbits -= bppp;
rdr::U8 index = (byte >> nbits) & ((1 << bppp) - 1) & 127;
*ptr++ = palette[index];
}
}
}
} else {
if (palSize == 0) {
// plain RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + t.area();
while (ptr < end) {
PIXEL_T pix = READ_PIXEL(zis);
int len = 1;
int b;
do {
b = zis->readU8();
len += b;
} while (b == 255);
if (end - ptr < len) {
fprintf (stderr, "ZRLE decode error\n");
throw Exception ("ZRLE decode error");
}
while (len-- > 0) *ptr++ = pix;
}
} else {
// palette RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + t.area();
while (ptr < end) {
int index = zis->readU8();
int len = 1;
if (index & 128) {
int b;
do {
b = zis->readU8();
len += b;
} while (b == 255);
if (end - ptr < len) {
fprintf (stderr, "ZRLE decode error\n");
throw Exception ("ZRLE decode error");
}
}
index &= 127;
PIXEL_T pix = palette[index];
while (len-- > 0) *ptr++ = pix;
}
}
}
//fprintf(stderr,"copying data to screen %dx%d at %d,%d\n",
//t.width(),t.height(),t.tl.x,t.tl.y);
handler->imageRect(t, buf);
}
}
zis->reset();
}
#undef ZRLE_DECODE
#undef READ_PIXEL
#undef PIXEL_T
}
|
