1 ; 2 ; x86 format converters for HERMES 3 ; Copyright (c) 1998 Glenn Fielder (gaffer (a] gaffer.org) 4 ; This source code is licensed under the GNU LGPL 5 ; 6 ; Please refer to the file COPYING.LIB contained in the distribution for 7 ; licensing conditions 8 ; 9 ; Routines adjusted for Hermes by Christian Nentwich (brn (a] eleet.mcb.at) 10 ; Used with permission. 11 ; 12 13 BITS 32 14 15 %include "common.inc" 16 17 SDL_FUNC _ConvertX86p16_16BGR565 18 SDL_FUNC _ConvertX86p16_16RGB555 19 SDL_FUNC _ConvertX86p16_16BGR555 20 SDL_FUNC _ConvertX86p16_8RGB332 21 22 EXTERN _ConvertX86 23 24 SECTION .text 25 26 _ConvertX86p16_16BGR565: 27 28 ; check short 29 cmp ecx,BYTE 16 30 ja .L3 31 32 33 .L1 ; short loop 34 mov al,[esi] 35 mov ah,[esi+1] 36 mov ebx,eax 37 mov edx,eax 38 shr eax,11 39 and eax,BYTE 11111b 40 and ebx,11111100000b 41 shl edx,11 42 add eax,ebx 43 add eax,edx 44 mov [edi],al 45 mov [edi+1],ah 46 add esi,BYTE 2 47 add edi,BYTE 2 48 dec ecx 49 jnz .L1 50 .L2 51 retn 52 53 .L3 ; head 54 mov eax,edi 55 and eax,BYTE 11b 56 jz .L4 57 mov al,[esi] 58 mov ah,[esi+1] 59 mov ebx,eax 60 mov edx,eax 61 shr eax,11 62 and eax,BYTE 11111b 63 and ebx,11111100000b 64 shl edx,11 65 add eax,ebx 66 add eax,edx 67 mov [edi],al 68 mov [edi+1],ah 69 add esi,BYTE 2 70 add edi,BYTE 2 71 dec ecx 72 73 .L4 ; save count 74 push ecx 75 76 ; unroll twice 77 shr ecx,1 78 79 ; point arrays to end 80 lea esi,[esi+ecx*4] 81 lea edi,[edi+ecx*4] 82 83 ; negative counter 84 neg ecx 85 jmp SHORT .L6 86 87 .L5 mov [edi+ecx*4-4],eax 88 .L6 mov eax,[esi+ecx*4] 89 90 mov ebx,[esi+ecx*4] 91 and eax,07E007E0h 92 93 mov edx,[esi+ecx*4] 94 and ebx,0F800F800h 95 96 shr ebx,11 97 and edx,001F001Fh 98 99 shl edx,11 100 add eax,ebx 101 102 add eax,edx 103 inc ecx 104 105 jnz .L5 106 107 mov [edi+ecx*4-4],eax 108 109 ; tail 110 pop ecx 111 and ecx,BYTE 1 112 jz .L7 113 mov al,[esi] 114 mov ah,[esi+1] 115 mov ebx,eax 116 mov edx,eax 117 shr eax,11 118 and eax,BYTE 11111b 119 and ebx,11111100000b 120 shl edx,11 121 add eax,ebx 122 add eax,edx 123 mov [edi],al 124 mov [edi+1],ah 125 add esi,BYTE 2 126 add edi,BYTE 2 127 128 .L7 129 retn 130 131 132 133 134 135 136 _ConvertX86p16_16RGB555: 137 138 ; check short 139 cmp ecx,BYTE 32 140 ja .L3 141 142 143 .L1 ; short loop 144 mov al,[esi] 145 mov ah,[esi+1] 146 mov ebx,eax 147 shr ebx,1 148 and ebx, 0111111111100000b 149 and eax,BYTE 0000000000011111b 150 add eax,ebx 151 mov [edi],al 152 mov [edi+1],ah 153 add esi,BYTE 2 154 add edi,BYTE 2 155 dec ecx 156 jnz .L1 157 .L2 158 retn 159 160 .L3 ; head 161 mov eax,edi 162 and eax,BYTE 11b 163 jz .L4 164 mov al,[esi] 165 mov ah,[esi+1] 166 mov ebx,eax 167 shr ebx,1 168 and ebx, 0111111111100000b 169 and eax,BYTE 0000000000011111b 170 add eax,ebx 171 mov [edi],al 172 mov [edi+1],ah 173 add esi,BYTE 2 174 add edi,BYTE 2 175 dec ecx 176 177 .L4 ; save ebp 178 push ebp 179 180 ; save count 181 push ecx 182 183 ; unroll four times 184 shr ecx,2 185 186 ; point arrays to end 187 lea esi,[esi+ecx*8] 188 lea edi,[edi+ecx*8] 189 190 ; negative counter 191 xor ebp,ebp 192 sub ebp,ecx 193 194 .L5 mov eax,[esi+ebp*8] ; agi? 195 mov ecx,[esi+ebp*8+4] 196 197 mov ebx,eax 198 mov edx,ecx 199 200 and eax,0FFC0FFC0h 201 and ecx,0FFC0FFC0h 202 203 shr eax,1 204 and ebx,001F001Fh 205 206 shr ecx,1 207 and edx,001F001Fh 208 209 add eax,ebx 210 add ecx,edx 211 212 mov [edi+ebp*8],eax 213 mov [edi+ebp*8+4],ecx 214 215 inc ebp 216 jnz .L5 217 218 ; tail 219 pop ecx 220 .L6 and ecx,BYTE 11b 221 jz .L7 222 mov al,[esi] 223 mov ah,[esi+1] 224 mov ebx,eax 225 shr ebx,1 226 and ebx, 0111111111100000b 227 and eax,BYTE 0000000000011111b 228 add eax,ebx 229 mov [edi],al 230 mov [edi+1],ah 231 add esi,BYTE 2 232 add edi,BYTE 2 233 dec ecx 234 jmp SHORT .L6 235 236 .L7 pop ebp 237 retn 238 239 240 241 242 243 244 _ConvertX86p16_16BGR555: 245 246 ; check short 247 cmp ecx,BYTE 16 248 ja .L3 249 250 251 .L1 ; short loop 252 mov al,[esi] 253 mov ah,[esi+1] 254 mov ebx,eax 255 mov edx,eax 256 shr eax,11 257 and eax,BYTE 11111b 258 shr ebx,1 259 and ebx,1111100000b 260 shl edx,10 261 and edx,0111110000000000b 262 add eax,ebx 263 add eax,edx 264 mov [edi],al 265 mov [edi+1],ah 266 add esi,BYTE 2 267 add edi,BYTE 2 268 dec ecx 269 jnz .L1 270 .L2 271 retn 272 273 .L3 ; head 274 mov eax,edi 275 and eax,BYTE 11b 276 jz .L4 277 mov al,[esi] 278 mov ah,[esi+1] 279 mov ebx,eax 280 mov edx,eax 281 shr eax,11 282 and eax,BYTE 11111b 283 shr ebx,1 284 and ebx,1111100000b 285 shl edx,10 286 and edx,0111110000000000b 287 add eax,ebx 288 add eax,edx 289 mov [edi],al 290 mov [edi+1],ah 291 add esi,BYTE 2 292 add edi,BYTE 2 293 dec ecx 294 295 .L4 ; save count 296 push ecx 297 298 ; unroll twice 299 shr ecx,1 300 301 ; point arrays to end 302 lea esi,[esi+ecx*4] 303 lea edi,[edi+ecx*4] 304 305 ; negative counter 306 neg ecx 307 jmp SHORT .L6 308 309 .L5 mov [edi+ecx*4-4],eax 310 .L6 mov eax,[esi+ecx*4] 311 312 shr eax,1 313 mov ebx,[esi+ecx*4] 314 315 and eax,03E003E0h 316 mov edx,[esi+ecx*4] 317 318 and ebx,0F800F800h 319 320 shr ebx,11 321 and edx,001F001Fh 322 323 shl edx,10 324 add eax,ebx 325 326 add eax,edx 327 inc ecx 328 329 jnz .L5 330 331 mov [edi+ecx*4-4],eax 332 333 ; tail 334 pop ecx 335 and ecx,BYTE 1 336 jz .L7 337 mov al,[esi] 338 mov ah,[esi+1] 339 mov ebx,eax 340 mov edx,eax 341 shr eax,11 342 and eax,BYTE 11111b 343 shr ebx,1 344 and ebx,1111100000b 345 shl edx,10 346 and edx,0111110000000000b 347 add eax,ebx 348 add eax,edx 349 mov [edi],al 350 mov [edi+1],ah 351 add esi,BYTE 2 352 add edi,BYTE 2 353 354 .L7 355 retn 356 357 358 359 360 361 362 _ConvertX86p16_8RGB332: 363 364 ; check short 365 cmp ecx,BYTE 16 366 ja .L3 367 368 369 .L1 ; short loop 370 mov al,[esi+0] 371 mov ah,[esi+1] 372 mov ebx,eax 373 mov edx,eax 374 and eax,BYTE 11000b ; blue 375 shr eax,3 376 and ebx,11100000000b ; green 377 shr ebx,6 378 and edx,1110000000000000b ; red 379 shr edx,8 380 add eax,ebx 381 add eax,edx 382 mov [edi],al 383 add esi,BYTE 2 384 inc edi 385 dec ecx 386 jnz .L1 387 .L2 388 retn 389 390 .L3 mov eax,edi 391 and eax,BYTE 11b 392 jz .L4 393 mov al,[esi+0] 394 mov ah,[esi+1] 395 mov ebx,eax 396 mov edx,eax 397 and eax,BYTE 11000b ; blue 398 shr eax,3 399 and ebx,11100000000b ; green 400 shr ebx,6 401 and edx,1110000000000000b ; red 402 shr edx,8 403 add eax,ebx 404 add eax,edx 405 mov [edi],al 406 add esi,BYTE 2 407 inc edi 408 dec ecx 409 jmp SHORT .L3 410 411 .L4 ; save ebp 412 push ebp 413 414 ; save count 415 push ecx 416 417 ; unroll 4 times 418 shr ecx,2 419 420 ; prestep 421 mov dl,[esi+0] 422 mov bl,[esi+1] 423 mov dh,[esi+2] 424 425 .L5 shl edx,16 426 mov bh,[esi+3] 427 428 shl ebx,16 429 mov dl,[esi+4] 430 431 mov dh,[esi+6] 432 mov bl,[esi+5] 433 434 and edx,00011000000110000001100000011000b 435 mov bh,[esi+7] 436 437 ror edx,16+3 438 mov eax,ebx ; setup eax for reds 439 440 and ebx,00000111000001110000011100000111b 441 and eax,11100000111000001110000011100000b ; reds 442 443 ror ebx,16-2 444 add esi,BYTE 8 445 446 ror eax,16 447 add edi,BYTE 4 448 449 add eax,ebx 450 mov bl,[esi+1] ; greens 451 452 add eax,edx 453 mov dl,[esi+0] ; blues 454 455 mov [edi-4],eax 456 mov dh,[esi+2] 457 458 dec ecx 459 jnz .L5 460 461 ; check tail 462 pop ecx 463 and ecx,BYTE 11b 464 jz .L7 465 466 .L6 ; tail 467 mov al,[esi+0] 468 mov ah,[esi+1] 469 mov ebx,eax 470 mov edx,eax 471 and eax,BYTE 11000b ; blue 472 shr eax,3 473 and ebx,11100000000b ; green 474 shr ebx,6 475 and edx,1110000000000000b ; red 476 shr edx,8 477 add eax,ebx 478 add eax,edx 479 mov [edi],al 480 add esi,BYTE 2 481 inc edi 482 dec ecx 483 jnz .L6 484 485 .L7 pop ebp 486 retn 487 488 %ifidn __OUTPUT_FORMAT__,elf 489 section .note.GNU-stack noalloc noexec nowrite progbits 490 %endif 491
