1 |
/* |
2 |
rdesktop: A Remote Desktop Protocol client. |
3 |
Bitmap decompression routines |
4 |
Copyright (C) Matthew Chapman 1999-2000 |
5 |
|
6 |
This program is free software; you can redistribute it and/or modify |
7 |
it under the terms of the GNU General Public License as published by |
8 |
the Free Software Foundation; either version 2 of the License, or |
9 |
(at your option) any later version. |
10 |
|
11 |
This program is distributed in the hope that it will be useful, |
12 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
GNU General Public License for more details. |
15 |
|
16 |
You should have received a copy of the GNU General Public License |
17 |
along with this program; if not, write to the Free Software |
18 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 |
*/ |
20 |
|
21 |
#include "includes.h" |
22 |
|
23 |
#define CVAL(p) (*(p++)) |
24 |
#define SVAL(p) ((*((p++) + 1) << 8) | CVAL(p)) |
25 |
|
26 |
#define REPEAT(statement) { while ((count > 0) && (x < width)) { statement; count--; x++; } } |
27 |
#define MASK_UPDATE() { maskpix <<= 1; if (maskpix == 0) { mask = CVAL(input); maskpix = 1; } } |
28 |
|
29 |
BOOL bitmap_decompress(unsigned char *output, int width, int height, |
30 |
unsigned char *input, int size) |
31 |
{ |
32 |
unsigned char *end = input + size; |
33 |
unsigned char *prevline, *line = NULL; |
34 |
int opcode, count, offset, isfillormix, x = width; |
35 |
uint8 code, mask, maskpix, color1, color2; |
36 |
uint8 mix = 0xff; |
37 |
|
38 |
dump_data(input, end-input); |
39 |
while (input < end) |
40 |
{ |
41 |
fprintf(stderr, "Offset %d from end\n", end-input); |
42 |
code = CVAL(input); |
43 |
opcode = code >> 4; |
44 |
|
45 |
/* Handle different opcode forms */ |
46 |
switch (opcode) |
47 |
{ |
48 |
case 0xc: |
49 |
case 0xd: |
50 |
case 0xe: |
51 |
opcode -= 6; |
52 |
count = code & 0xf; |
53 |
offset = 16; |
54 |
break; |
55 |
|
56 |
case 0xf: |
57 |
opcode = code & 0xf; |
58 |
count = (opcode < 13) ? SVAL(input) : 1; |
59 |
offset = 0; |
60 |
break; |
61 |
|
62 |
default: |
63 |
opcode >>= 1; |
64 |
count = code & 0x1f; |
65 |
offset = 32; |
66 |
break; |
67 |
} |
68 |
|
69 |
/* Handle strange cases for counts */ |
70 |
if (offset != 0) |
71 |
{ |
72 |
isfillormix = ((opcode == 2) || (opcode == 7)); |
73 |
|
74 |
if (count == 0) |
75 |
{ |
76 |
if (isfillormix) |
77 |
count = CVAL(input) + 1; |
78 |
else |
79 |
count = CVAL(input) + offset; |
80 |
} |
81 |
else if (isfillormix) |
82 |
{ |
83 |
count <<= 3; |
84 |
} |
85 |
} |
86 |
|
87 |
/* Read preliminary data */ |
88 |
maskpix = 0; |
89 |
switch (opcode) |
90 |
{ |
91 |
case 3: /* Color */ |
92 |
color1 = CVAL(input); |
93 |
case 8: /* Bicolor */ |
94 |
color2 = CVAL(input); |
95 |
break; |
96 |
case 6: /* SetMix/Mix */ |
97 |
case 7: /* SetMix/FillOrMix */ |
98 |
mix = CVAL(input); |
99 |
opcode -= 5; |
100 |
break; |
101 |
} |
102 |
|
103 |
/* Output body */ |
104 |
while (count > 0) |
105 |
{ |
106 |
if (x >= width) |
107 |
{ |
108 |
if (height <= 0) |
109 |
return True; |
110 |
|
111 |
x = 0; |
112 |
height--; |
113 |
|
114 |
prevline = line; |
115 |
line = output + height * width; |
116 |
} |
117 |
|
118 |
switch (opcode) |
119 |
{ |
120 |
case 0: /* Fill */ |
121 |
fprintf(stderr, "Fill %d\n", count); |
122 |
if (prevline == NULL) |
123 |
REPEAT(line[x] = 0) |
124 |
else |
125 |
REPEAT(line[x] = prevline[x]) |
126 |
break; |
127 |
|
128 |
case 1: /* Mix */ |
129 |
fprintf(stderr, "Mix %d\n", count); |
130 |
if (prevline == NULL) |
131 |
REPEAT(line[x] = mix) |
132 |
else |
133 |
REPEAT(line[x] = prevline[x] ^ mix) |
134 |
break; |
135 |
|
136 |
#if 0 |
137 |
case 2: /* Fill or Mix */ |
138 |
REPEAT(line[x] = 0); |
139 |
break; |
140 |
if (prevline == NULL) |
141 |
REPEAT( |
142 |
MASK_UPDATE(); |
143 |
|
144 |
if (mask & maskpix) |
145 |
line[x] = mix; |
146 |
else |
147 |
line[x] = 0; |
148 |
) |
149 |
else |
150 |
REPEAT( |
151 |
MASK_UPDATE(); |
152 |
|
153 |
if (mask & maskpix) |
154 |
line[x] = prevline[x] ^ mix; |
155 |
else |
156 |
line[x] = prevline[x]; |
157 |
) |
158 |
break; |
159 |
#endif |
160 |
|
161 |
case 3: /* Colour */ |
162 |
fprintf(stderr, "Colour %d\n", count); |
163 |
REPEAT(line[x] = color2) |
164 |
break; |
165 |
|
166 |
case 4: /* Copy */ |
167 |
fprintf(stderr, "Copy %d\n", count); |
168 |
REPEAT(line[x] = CVAL(input)) |
169 |
break; |
170 |
|
171 |
#if 0 |
172 |
case 8: /* Bicolor */ |
173 |
REPEAT(line[x] = color1; line[++x] = color2) |
174 |
break; |
175 |
|
176 |
case 13: /* White */ |
177 |
REPEAT(line[x] = 0xff) |
178 |
break; |
179 |
|
180 |
case 14: /* Black */ |
181 |
REPEAT(line[x] = 0x00) |
182 |
break; |
183 |
#endif |
184 |
|
185 |
default: |
186 |
fprintf(stderr, "Unknown bitmap opcode 0x%x\n", opcode); |
187 |
return False; |
188 |
} |
189 |
} |
190 |
} |
191 |
|
192 |
return True; |
193 |
} |