| 1 |
/* -*- c-basic-offset: 8 -*- |
| 2 |
rdesktop: A Remote Desktop Protocol client. |
| 3 |
Bitmap decompression routines |
| 4 |
Copyright (C) Matthew Chapman 1999-2002 |
| 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 "rdesktop.h" |
| 22 |
|
| 23 |
#define CVAL(p) (*(p++)) |
| 24 |
|
| 25 |
static uint32 |
| 26 |
cvalx(unsigned char **input, int Bpp) |
| 27 |
{ |
| 28 |
uint32 rv = 0; |
| 29 |
memcpy(&rv, *input, Bpp); |
| 30 |
*input += Bpp; |
| 31 |
return rv; |
| 32 |
} |
| 33 |
|
| 34 |
static void |
| 35 |
setli(unsigned char *input, int offset, uint32 value, int Bpp) |
| 36 |
{ |
| 37 |
input += offset * Bpp; |
| 38 |
memcpy(input, &value, Bpp); |
| 39 |
} |
| 40 |
|
| 41 |
static uint32 |
| 42 |
getli(unsigned char *input, int offset, int Bpp) |
| 43 |
{ |
| 44 |
uint32 rv = 0; |
| 45 |
input += offset * Bpp; |
| 46 |
memcpy(&rv, input, Bpp); |
| 47 |
return rv; |
| 48 |
} |
| 49 |
|
| 50 |
#define UNROLL8(exp) { exp exp exp exp exp exp exp exp } |
| 51 |
|
| 52 |
#define REPEAT(statement) \ |
| 53 |
{ \ |
| 54 |
while((count & ~0x7) && ((x+8) < width)) \ |
| 55 |
UNROLL8( statement; count--; x++; ); \ |
| 56 |
\ |
| 57 |
while((count > 0) && (x < width)) { statement; count--; x++; } \ |
| 58 |
} |
| 59 |
|
| 60 |
#define MASK_UPDATE() \ |
| 61 |
{ \ |
| 62 |
mixmask <<= 1; \ |
| 63 |
if (mixmask == 0) \ |
| 64 |
{ \ |
| 65 |
mask = fom_mask ? fom_mask : CVAL(input); \ |
| 66 |
mixmask = 1; \ |
| 67 |
} \ |
| 68 |
} |
| 69 |
|
| 70 |
BOOL |
| 71 |
bitmap_decompress(unsigned char *output, int width, int height, unsigned char *input, int size, |
| 72 |
int Bpp) |
| 73 |
{ |
| 74 |
unsigned char *end = input + size; |
| 75 |
unsigned char *prevline = NULL, *line = NULL; |
| 76 |
int opcode, count, offset, isfillormix, x = width; |
| 77 |
int lastopcode = -1, insertmix = False, bicolour = False; |
| 78 |
uint8 code; |
| 79 |
uint32 colour1 = 0, colour2 = 0; |
| 80 |
uint8 mixmask, mask = 0; |
| 81 |
uint32 mix = 0xffffffff; |
| 82 |
int fom_mask = 0; |
| 83 |
|
| 84 |
while (input < end) |
| 85 |
{ |
| 86 |
fom_mask = 0; |
| 87 |
code = CVAL(input); |
| 88 |
opcode = code >> 4; |
| 89 |
|
| 90 |
/* Handle different opcode forms */ |
| 91 |
switch (opcode) |
| 92 |
{ |
| 93 |
case 0xc: |
| 94 |
case 0xd: |
| 95 |
case 0xe: |
| 96 |
opcode -= 6; |
| 97 |
count = code & 0xf; |
| 98 |
offset = 16; |
| 99 |
break; |
| 100 |
|
| 101 |
case 0xf: |
| 102 |
opcode = code & 0xf; |
| 103 |
if (opcode < 9) |
| 104 |
{ |
| 105 |
count = CVAL(input); |
| 106 |
count |= CVAL(input) << 8; |
| 107 |
} |
| 108 |
else |
| 109 |
{ |
| 110 |
count = (opcode < 0xb) ? 8 : 1; |
| 111 |
} |
| 112 |
offset = 0; |
| 113 |
break; |
| 114 |
|
| 115 |
default: |
| 116 |
opcode >>= 1; |
| 117 |
count = code & 0x1f; |
| 118 |
offset = 32; |
| 119 |
break; |
| 120 |
} |
| 121 |
|
| 122 |
/* Handle strange cases for counts */ |
| 123 |
if (offset != 0) |
| 124 |
{ |
| 125 |
isfillormix = ((opcode == 2) || (opcode == 7)); |
| 126 |
|
| 127 |
if (count == 0) |
| 128 |
{ |
| 129 |
if (isfillormix) |
| 130 |
count = CVAL(input) + 1; |
| 131 |
else |
| 132 |
count = CVAL(input) + offset; |
| 133 |
} |
| 134 |
else if (isfillormix) |
| 135 |
{ |
| 136 |
count <<= 3; |
| 137 |
} |
| 138 |
} |
| 139 |
|
| 140 |
/* Read preliminary data */ |
| 141 |
switch (opcode) |
| 142 |
{ |
| 143 |
case 0: /* Fill */ |
| 144 |
if ((lastopcode == opcode) && !((x == width) && (prevline == NULL))) |
| 145 |
insertmix = True; |
| 146 |
break; |
| 147 |
case 8: /* Bicolour */ |
| 148 |
colour1 = cvalx(&input, Bpp); |
| 149 |
case 3: /* Colour */ |
| 150 |
colour2 = cvalx(&input, Bpp); |
| 151 |
break; |
| 152 |
case 6: /* SetMix/Mix */ |
| 153 |
case 7: /* SetMix/FillOrMix */ |
| 154 |
mix = cvalx(&input, Bpp); |
| 155 |
opcode -= 5; |
| 156 |
break; |
| 157 |
case 9: /* FillOrMix_1 */ |
| 158 |
mask = 0x03; |
| 159 |
opcode = 0x02; |
| 160 |
fom_mask = 3; |
| 161 |
break; |
| 162 |
case 0x0a: /* FillOrMix_2 */ |
| 163 |
mask = 0x05; |
| 164 |
opcode = 0x02; |
| 165 |
fom_mask = 5; |
| 166 |
break; |
| 167 |
|
| 168 |
} |
| 169 |
|
| 170 |
lastopcode = opcode; |
| 171 |
mixmask = 0; |
| 172 |
|
| 173 |
/* Output body */ |
| 174 |
while (count > 0) |
| 175 |
{ |
| 176 |
if (x >= width) |
| 177 |
{ |
| 178 |
if (height <= 0) |
| 179 |
return False; |
| 180 |
|
| 181 |
x = 0; |
| 182 |
height--; |
| 183 |
|
| 184 |
prevline = line; |
| 185 |
line = output + height * width * Bpp; |
| 186 |
} |
| 187 |
|
| 188 |
switch (opcode) |
| 189 |
{ |
| 190 |
case 0: /* Fill */ |
| 191 |
if (insertmix) |
| 192 |
{ |
| 193 |
if (prevline == NULL) |
| 194 |
setli(line, x, mix, Bpp); |
| 195 |
else |
| 196 |
setli(line, x, |
| 197 |
getli(prevline, x, Bpp) ^ mix, Bpp); |
| 198 |
|
| 199 |
insertmix = False; |
| 200 |
count--; |
| 201 |
x++; |
| 202 |
} |
| 203 |
|
| 204 |
if (prevline == NULL) |
| 205 |
{ |
| 206 |
REPEAT(setli(line, x, 0, Bpp))} |
| 207 |
else |
| 208 |
{ |
| 209 |
REPEAT(setli |
| 210 |
(line, x, getli(prevline, x, Bpp), Bpp)); |
| 211 |
} |
| 212 |
break; |
| 213 |
|
| 214 |
case 1: /* Mix */ |
| 215 |
if (prevline == NULL) |
| 216 |
{ |
| 217 |
REPEAT(setli(line, x, mix, Bpp)); |
| 218 |
} |
| 219 |
else |
| 220 |
{ |
| 221 |
REPEAT(setli |
| 222 |
(line, x, getli(prevline, x, Bpp) ^ mix, |
| 223 |
Bpp)); |
| 224 |
} |
| 225 |
break; |
| 226 |
|
| 227 |
case 2: /* Fill or Mix */ |
| 228 |
if (prevline == NULL) |
| 229 |
{ |
| 230 |
REPEAT(MASK_UPDATE(); |
| 231 |
if (mask & mixmask) setli(line, x, mix, Bpp); |
| 232 |
else |
| 233 |
setli(line, x, 0, Bpp);); |
| 234 |
} |
| 235 |
else |
| 236 |
{ |
| 237 |
REPEAT(MASK_UPDATE(); |
| 238 |
if (mask & mixmask) |
| 239 |
setli(line, x, getli(prevline, x, Bpp) ^ mix, |
| 240 |
Bpp); |
| 241 |
else |
| 242 |
setli(line, x, getli(prevline, x, Bpp), |
| 243 |
Bpp);); |
| 244 |
} |
| 245 |
break; |
| 246 |
|
| 247 |
case 3: /* Colour */ |
| 248 |
REPEAT(setli(line, x, colour2, Bpp)); |
| 249 |
break; |
| 250 |
|
| 251 |
case 4: /* Copy */ |
| 252 |
REPEAT(setli(line, x, cvalx(&input, Bpp), Bpp)); |
| 253 |
break; |
| 254 |
|
| 255 |
case 8: /* Bicolour */ |
| 256 |
REPEAT(if (bicolour) |
| 257 |
{ |
| 258 |
setli(line, x, colour2, Bpp); bicolour = False;} |
| 259 |
else |
| 260 |
{ |
| 261 |
setli(line, x, colour1, Bpp); bicolour = True; |
| 262 |
count++;} |
| 263 |
); |
| 264 |
break; |
| 265 |
|
| 266 |
case 0xd: /* White */ |
| 267 |
REPEAT(setli(line, x, 0xffffffff, Bpp)); |
| 268 |
break; |
| 269 |
|
| 270 |
case 0xe: /* Black */ |
| 271 |
REPEAT(setli(line, x, 0, Bpp)); |
| 272 |
break; |
| 273 |
|
| 274 |
default: |
| 275 |
unimpl("bitmap opcode 0x%x\n", opcode); |
| 276 |
return False; |
| 277 |
} |
| 278 |
} |
| 279 |
} |
| 280 |
|
| 281 |
return True; |
| 282 |
} |
Parent Directory
| 
Revision Log