| 1 | /* |
| 2 | * 240x160 -> 320x213 upscaler for ARM with interpolation |
| 3 | * |
| 4 | * Written by GraÅžvydas "notaz" Ignotas |
| 5 | * Prototyped by Rokas |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions are met: |
| 9 | * * Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * * Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * * Neither the name of the organization nor the |
| 15 | * names of its contributors may be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * |
| 29 | * 0 1 2 : 3 4 5 |
| 30 | * 6 7 8 : 9 10 11 |
| 31 | * 12 13 14 : 15 16 17 |
| 32 | * v |
| 33 | * 0 1 2 3 : 4 5 6 7 |
| 34 | * 8 9 10 11 : 12 13 14 15 |
| 35 | * 16 17 18 19 : 20 21 22 23 |
| 36 | * 24 25 26 27 : 28 29 30 31 |
| 37 | */ |
| 38 | |
| 39 | .macro unpack_hi dst, src |
| 40 | mov \dst, \src, lsr #16 |
| 41 | orr \dst, \dst, \dst, lsl #16 |
| 42 | and \dst, \dst, lr |
| 43 | .endm |
| 44 | |
| 45 | .macro unpack_lo dst, src |
| 46 | mov \dst, \src, lsl #16 |
| 47 | orr \dst, \dst, \dst, lsr #16 |
| 48 | and \dst, \dst, lr |
| 49 | .endm |
| 50 | |
| 51 | @ do 3:5 summing: r2 = (s1*3 + s2*5 + 4) / 8 |
| 52 | @ s2 != r2 |
| 53 | .macro do_3_5 s1, s2 |
| 54 | add r2,\s1,\s1, lsl #1 @ r2 = s1 * 3 |
| 55 | add r2, r2,\s2, lsl #2 |
| 56 | add r2, r2,\s2 @ r2 += s2 * 5 |
| 57 | add r2, r2, r12,lsl #2 @ sum += round * 4 |
| 58 | and r2, lr, r2, lsr #3 @ mask_to_unpacked(sum / 8) |
| 59 | .endm |
| 60 | |
| 61 | @ do 14:7:7:4: r2 = (s1*14 + s2*7 + s3*7 + s4*4 + 16) / 32 |
| 62 | @ {s2,s3,s4} != r2 |
| 63 | .macro do_14_7_7_4 s1, s2, s3, s4 |
| 64 | mov r2,\s1, lsl #4 |
| 65 | sub r2, r2,\s1, lsl #1 @ r2 = s1 * 14 |
| 66 | add r2, r2,\s2, lsl #3 |
| 67 | sub r2, r2,\s2 @ r2 += s2 * 7 |
| 68 | add r2, r2,\s3, lsl #3 |
| 69 | sub r2, r2,\s3 @ r2 += s3 * 7 |
| 70 | add r2, r2,\s4, lsl #2 @ r2 += s4 * 4 |
| 71 | add r2, r2, r12,lsl #3 @ sum += round * 16 |
| 72 | and r2, lr, r2, lsr #5 @ mask_to_unpacked(sum / 32) |
| 73 | .endm |
| 74 | |
| 75 | .global upscale_aspect @ u16 *dst, u16 *src |
| 76 | upscale_aspect: |
| 77 | stmfd sp!,{r4-r11,lr} |
| 78 | mov lr, #0x0000001f |
| 79 | orr lr, lr, #0x0000f800 @ for "unpacked" form of |
| 80 | orr lr, lr, #0x07e00000 @ 00000ggg'ggg00000'rrrrr000'000bbbbb |
| 81 | mov r12, #0x00000001 |
| 82 | orr r12,r12,#0x00000800 |
| 83 | orr r12,r12,#0x00200000 @ rounding constant |
| 84 | |
| 85 | mov r8, #((240/6)-1) << 24 @ cols |
| 86 | orr r8, r8, #160/3 @ rows |
| 87 | |
| 88 | add r0, r0, #320*2*13 |
| 89 | loop1: |
| 90 | ldr r10,[r1] |
| 91 | ldr r11,[r1, #320*2*1] |
| 92 | |
| 93 | unpack_lo r4, r10 |
| 94 | unpack_hi r5, r10 |
| 95 | unpack_lo r6, r11 |
| 96 | unpack_hi r7, r11 |
| 97 | |
| 98 | ldr r11,[r1, #4] |
| 99 | |
| 100 | do_3_5 r4, r5 |
| 101 | orr r2, r2, r2, lsr #16 |
| 102 | mov r3, r10, lsl #16 |
| 103 | mov r3, r3, lsr #16 |
| 104 | orr r2, r3, r2, lsl #16 |
| 105 | str r2, [r0] @ 0,1 |
| 106 | |
| 107 | ldr r10,[r1, #320*2*2] |
| 108 | |
| 109 | do_3_5 r4, r6 |
| 110 | orr r3, r2, r2, lsl #16 |
| 111 | mov r3, r3, lsr #16 @ 8 |
| 112 | |
| 113 | do_14_7_7_4 r7, r5, r6, r4 |
| 114 | orr r2, r2, r2, lsr #16 |
| 115 | orr r2, r3, r2, lsl #16 |
| 116 | str r2, [r0, #320*2*1] @ 8,9 |
| 117 | |
| 118 | unpack_lo r4, r10 |
| 119 | unpack_hi r9, r10 |
| 120 | |
| 121 | do_3_5 r4, r6 |
| 122 | orr r3, r2, r2, lsl #16 |
| 123 | mov r3, r3, lsr #16 |
| 124 | |
| 125 | do_14_7_7_4 r7, r9, r6, r4 |
| 126 | orr r2, r2, r2, lsr #16 |
| 127 | orr r2, r3, r2, lsl #16 |
| 128 | str r2, [r0, #320*2*2] @ 16,17 |
| 129 | |
| 130 | do_3_5 r4, r9 |
| 131 | orr r2, r2, r2, lsr #16 |
| 132 | mov r3, r10, lsl #16 |
| 133 | mov r3, r3, lsr #16 |
| 134 | orr r2, r3, r2, lsl #16 |
| 135 | str r2, [r0, #320*2*3] @ 24,25 |
| 136 | |
| 137 | ldr r10,[r1, #320*2*1+4] |
| 138 | |
| 139 | unpack_lo r6, r11 |
| 140 | unpack_lo r4, r10 |
| 141 | |
| 142 | do_3_5 r6, r5 |
| 143 | orr r2, r2, r2, lsl #16 |
| 144 | mov r3, r11, lsl #16 |
| 145 | orr r2, r3, r2, lsr #16 |
| 146 | str r2, [r0, #4] @ 2,3 |
| 147 | |
| 148 | do_14_7_7_4 r7, r4, r5, r6 |
| 149 | orr r2, r2, r2, lsl #16 |
| 150 | mov r3, r2, lsr #16 |
| 151 | |
| 152 | ldr r5, [r1, #320*2*2+4] |
| 153 | |
| 154 | do_3_5 r6, r4 |
| 155 | orr r2, r2, r2, lsr #16 |
| 156 | orr r2, r3, r2, lsl #16 |
| 157 | str r2, [r0, #320*2*1+4] @ 10,11 |
| 158 | |
| 159 | unpack_lo r6, r5 |
| 160 | |
| 161 | do_14_7_7_4 r7, r4, r9, r6 |
| 162 | orr r2, r2, r2, lsl #16 |
| 163 | mov r3, r2, lsr #16 |
| 164 | |
| 165 | do_3_5 r6, r4 |
| 166 | orr r2, r2, r2, lsr #16 |
| 167 | orr r2, r3, r2, lsl #16 |
| 168 | str r2, [r0, #320*2*2+4] @ 18,19 |
| 169 | |
| 170 | unpack_hi r4, r10 |
| 171 | |
| 172 | ldr r10,[r1, #8] |
| 173 | |
| 174 | do_3_5 r6, r9 |
| 175 | orr r2, r2, r2, lsl #16 |
| 176 | mov r2, r2, lsr #16 |
| 177 | orr r2, r2, r5, lsl #16 |
| 178 | str r2, [r0, #320*2*3+4] @ 26,27 |
| 179 | |
| 180 | unpack_hi r6, r11 |
| 181 | unpack_lo r7, r10 |
| 182 | |
| 183 | do_3_5 r6, r7 |
| 184 | orr r2, r2, r2, lsr #16 |
| 185 | mov r2, r2, lsl #16 |
| 186 | orr r2, r2, r11,lsr #16 |
| 187 | str r2, [r0, #8] @ 4,5 |
| 188 | |
| 189 | ldr r11,[r1, #320*2*1+8] |
| 190 | |
| 191 | unpack_hi r9, r10 |
| 192 | |
| 193 | do_3_5 r9, r7 |
| 194 | orr r2, r2, r2, lsr #16 |
| 195 | mov r2, r2, lsl #16 |
| 196 | orr r2, r2, r10,lsr #16 |
| 197 | mov r2, r2, ror #16 |
| 198 | str r2, [r0, #12] @ 6,7 |
| 199 | |
| 200 | unpack_lo r10,r11 |
| 201 | |
| 202 | do_3_5 r6, r4 |
| 203 | orr r2, r2, r2, lsl #16 |
| 204 | mov r3, r2, lsr #16 |
| 205 | |
| 206 | do_14_7_7_4 r10, r4, r7, r6 |
| 207 | orr r2, r2, r2, lsr #16 |
| 208 | orr r2, r3, r2, lsl #16 |
| 209 | str r2, [r0, #320*2*1+8] @ 12,13 |
| 210 | |
| 211 | unpack_hi r6, r11 |
| 212 | |
| 213 | ldr r11,[r1, #320*2*2+8] |
| 214 | |
| 215 | do_14_7_7_4 r10, r6, r7, r9 |
| 216 | orr r2, r2, r2, lsl #16 |
| 217 | mov r3, r2, lsr #16 |
| 218 | |
| 219 | do_3_5 r9, r6 |
| 220 | orr r2, r2, r2, lsr #16 |
| 221 | orr r2, r3, r2, lsl #16 |
| 222 | str r2, [r0, #320*2*1+12] @ 14,15 |
| 223 | |
| 224 | unpack_hi r7, r5 |
| 225 | unpack_lo r9, r11 |
| 226 | |
| 227 | do_3_5 r7, r4 |
| 228 | orr r2, r2, r2, lsl #16 |
| 229 | mov r3, r2, lsr #16 |
| 230 | |
| 231 | do_14_7_7_4 r10, r4, r9, r7 |
| 232 | orr r2, r2, r2, lsr #16 |
| 233 | orr r2, r3, r2, lsl #16 |
| 234 | str r2, [r0, #320*2*2+8] @ 20,21 |
| 235 | |
| 236 | do_3_5 r7, r9 |
| 237 | orr r2, r2, r2, lsr #16 |
| 238 | mov r2, r2, lsl #16 |
| 239 | orr r2, r2, r5, lsr #16 |
| 240 | str r2, [r0, #320*2*3+8] @ 28,29 |
| 241 | |
| 242 | unpack_hi r5, r11 |
| 243 | |
| 244 | do_14_7_7_4 r10, r6, r9, r5 |
| 245 | orr r2, r2, r2, lsl #16 |
| 246 | mov r3, r2, lsr #16 |
| 247 | |
| 248 | do_3_5 r5, r6 |
| 249 | orr r2, r2, r2, lsr #16 |
| 250 | orr r2, r3, r2, lsl #16 |
| 251 | str r2, [r0, #320*2*2+12] @ 22,23 |
| 252 | |
| 253 | do_3_5 r5, r9 |
| 254 | orr r2, r2, r2, lsr #16 |
| 255 | mov r3, r11, lsr #16 |
| 256 | orr r2, r3, r2, lsl #16 |
| 257 | mov r2, r2, ror #16 |
| 258 | str r2, [r0, #320*2*3+12] @ 30,31 |
| 259 | |
| 260 | add r0, r0, #16 |
| 261 | add r1, r1, #12 |
| 262 | |
| 263 | subs r8, r8, #1<<24 |
| 264 | bpl loop1 |
| 265 | |
| 266 | add r0, r0, #320*3*2 |
| 267 | add r1, r1, #(320*2+80)*2 |
| 268 | sub r8, r8, #1 |
| 269 | tst r8, #0xff |
| 270 | add r8, r8, #(240/6) << 24 @ cols |
| 271 | bne loop1 |
| 272 | |
| 273 | @@ last line |
| 274 | mov r8, #240/6 |
| 275 | |
| 276 | loop2: |
| 277 | ldmia r1!,{r9,r10,r11} |
| 278 | |
| 279 | unpack_lo r4, r9 |
| 280 | unpack_hi r5, r9 |
| 281 | |
| 282 | do_3_5 r4, r5 |
| 283 | orr r2, r2, r2, lsr #16 |
| 284 | mov r3, r9, lsl #16 |
| 285 | mov r3, r3, lsr #16 |
| 286 | orr r2, r3, r2, lsl #16 |
| 287 | str r2, [r0], #4 |
| 288 | |
| 289 | unpack_lo r6, r10 |
| 290 | unpack_hi r7, r10 |
| 291 | |
| 292 | do_3_5 r6, r5 |
| 293 | orr r2, r2, r2, lsl #16 |
| 294 | mov r2, r2, lsr #16 |
| 295 | orr r2, r2, r10,lsl #16 |
| 296 | str r2, [r0], #4 |
| 297 | |
| 298 | unpack_lo r4, r11 |
| 299 | unpack_hi r5, r11 |
| 300 | |
| 301 | do_3_5 r7, r4 |
| 302 | orr r2, r2, r2, lsr #16 |
| 303 | mov r3, r10, lsr #16 |
| 304 | orr r2, r3, r2, lsl #16 |
| 305 | str r2, [r0], #4 |
| 306 | |
| 307 | do_3_5 r5, r4 |
| 308 | orr r2, r2, r2, lsr #16 |
| 309 | mov r3, r11, lsr #16 |
| 310 | orr r2, r3, r2, lsl #16 |
| 311 | mov r2, r2, ror #16 |
| 312 | str r2, [r0], #4 |
| 313 | |
| 314 | subs r8, r8, #1 |
| 315 | bne loop2 |
| 316 | |
| 317 | ldmfd sp!,{r4-r11,pc} |
| 318 | |
| 319 | |
| 320 | .global upscale_aspect_row @ void *dst, void *linesx4, u32 row |
| 321 | upscale_aspect_row: |
| 322 | stmfd sp!,{r4-r11,lr} |
| 323 | mov lr, #0x0000001f |
| 324 | orr lr, lr, #0x0000f800 @ for "unpacked" form of |
| 325 | orr lr, lr, #0x07e00000 @ 00000ggg'ggg00000'rrrrr000'000bbbbb |
| 326 | mov r12, #0x00000001 |
| 327 | orr r12,r12,#0x00000800 |
| 328 | orr r12,r12,#0x00200000 @ rounding constant |
| 329 | |
| 330 | mov r8, #(240/6) @ cols |
| 331 | |
| 332 | add r0, r0, #(240*320)*2 |
| 333 | add r0, r0, #12*2 |
| 334 | add r0, r0, r2, lsl #3 |
| 335 | |
| 336 | uar_loop: |
| 337 | ldr r10,[r1] |
| 338 | ldr r11,[r1, #240*2*1] |
| 339 | |
| 340 | unpack_lo r4, r10 |
| 341 | unpack_hi r5, r10 |
| 342 | unpack_lo r6, r11 |
| 343 | unpack_hi r7, r11 |
| 344 | |
| 345 | ldr r11,[r1, #240*2*2] |
| 346 | |
| 347 | do_3_5 r4, r6 |
| 348 | orr r2, r2, r2, lsr #16 |
| 349 | mov r3, r10, lsl #16 |
| 350 | mov r3, r3, lsr #16 |
| 351 | orr r2, r3, r2, lsl #16 |
| 352 | str r2, [r0, #-240*2]! @ 0,8 |
| 353 | |
| 354 | unpack_lo r10,r11 |
| 355 | unpack_hi r9, r11 |
| 356 | |
| 357 | do_3_5 r10,r6 |
| 358 | orr r2, r2, r2, lsl #16 |
| 359 | mov r3, r11, lsl #16 |
| 360 | orr r2, r3, r2, lsr #16 |
| 361 | str r2, [r0, #4] @ 16,24 |
| 362 | |
| 363 | do_3_5 r4, r5 |
| 364 | orr r3, r2, r2, lsl #16 |
| 365 | |
| 366 | do_14_7_7_4 r7, r5, r6, r4 |
| 367 | orr r2, r2, r2, lsr #16 |
| 368 | mov r3, r3, lsr #16 |
| 369 | orr r2, r3, r2, lsl #16 |
| 370 | str r2, [r0, #-240*2]! @ 1,9 |
| 371 | |
| 372 | ldr r11,[r1, #4] |
| 373 | |
| 374 | do_14_7_7_4 r7, r6, r9, r10 |
| 375 | orr r3, r2, r2, lsl #16 |
| 376 | |
| 377 | do_3_5 r10,r9 |
| 378 | orr r2, r2, r2, lsr #16 |
| 379 | mov r3, r3, lsr #16 |
| 380 | orr r2, r3, r2, lsl #16 |
| 381 | str r2, [r0, #4] @ 17,25 |
| 382 | |
| 383 | ldr r10,[r1, #240*2*1+4] |
| 384 | |
| 385 | unpack_lo r4, r11 |
| 386 | unpack_lo r6, r10 |
| 387 | |
| 388 | do_3_5 r4, r5 |
| 389 | orr r3, r2, r2, lsl #16 |
| 390 | |
| 391 | do_14_7_7_4 r7, r5, r6, r4 |
| 392 | orr r2, r2, r2, lsr #16 |
| 393 | mov r3, r3, lsr #16 |
| 394 | orr r2, r3, r2, lsl #16 |
| 395 | str r2, [r0, #-240*2]! @ 2,10 |
| 396 | |
| 397 | do_3_5 r4, r6 |
| 398 | |
| 399 | ldr r4, [r1, #240*2*2+4] |
| 400 | |
| 401 | orr r2, r2, r2, lsr #16 |
| 402 | mov r3, r11, lsl #16 |
| 403 | mov r3, r3, lsr #16 |
| 404 | orr r2, r3, r2, lsl #16 |
| 405 | str r2, [r0, #-240*2] @ 3,11 |
| 406 | |
| 407 | unpack_lo r5, r4 |
| 408 | |
| 409 | do_14_7_7_4 r7, r6, r9, r5 |
| 410 | orr r3, r2, r2, lsl #16 |
| 411 | |
| 412 | do_3_5 r5, r9 |
| 413 | orr r2, r2, r2, lsr #16 |
| 414 | mov r2, r2, lsl #16 |
| 415 | orr r2, r2, r3, lsr #16 |
| 416 | str r2, [r0, #4] @ 18,26 |
| 417 | |
| 418 | do_3_5 r5, r6 |
| 419 | orr r2, r2, r2, lsl #16 |
| 420 | mov r3, r4, lsl #16 |
| 421 | orr r2, r3, r2, lsr #16 |
| 422 | str r2, [r0, #-240*2+4] @ 19,27 |
| 423 | |
| 424 | unpack_hi r5, r11 |
| 425 | unpack_hi r6, r10 |
| 426 | unpack_hi r7, r4 |
| 427 | |
| 428 | ldr r10,[r1, #8] |
| 429 | |
| 430 | do_3_5 r5, r6 |
| 431 | orr r2, r2, r2, lsr #16 |
| 432 | mov r3, r11, lsr #16 |
| 433 | orr r2, r3, r2, lsl #16 |
| 434 | str r2, [r0, #-240*2*2]! @ 4,12 |
| 435 | |
| 436 | ldr r11,[r1, #240*2*1+8] |
| 437 | |
| 438 | do_3_5 r7, r6 |
| 439 | orr r2, r2, r2, lsl #16 |
| 440 | mov r3, r4, lsr #16 |
| 441 | mov r3, r3, lsl #16 |
| 442 | orr r2, r3, r2, lsr #16 |
| 443 | str r2, [r0, #4] @ 20,28 |
| 444 | |
| 445 | unpack_lo r4, r10 |
| 446 | unpack_lo r9, r11 |
| 447 | |
| 448 | ldr r11,[r1, #240*2*2+8] |
| 449 | |
| 450 | do_3_5 r5, r4 |
| 451 | orr r3, r2, r2, lsl #16 |
| 452 | |
| 453 | do_14_7_7_4 r9, r4, r6, r5 |
| 454 | orr r2, r2, r2, lsr #16 |
| 455 | mov r2, r2, lsl #16 |
| 456 | orr r2, r2, r3, lsr #16 |
| 457 | str r2, [r0, #-240*2]! @ 5,13 |
| 458 | |
| 459 | unpack_lo r5, r11 |
| 460 | |
| 461 | do_14_7_7_4 r9, r5, r6, r7 |
| 462 | orr r3, r2, r2, lsl #16 |
| 463 | |
| 464 | do_3_5 r7, r5 |
| 465 | orr r2, r2, r2, lsr #16 |
| 466 | mov r3, r3, lsr #16 |
| 467 | orr r2, r3, r2, lsl #16 |
| 468 | str r2, [r0, #4] @ 21,29 |
| 469 | |
| 470 | ldr r7, [r1, #240*2*1+8] |
| 471 | |
| 472 | unpack_hi r6, r10 |
| 473 | unpack_hi r7, r7 |
| 474 | |
| 475 | do_3_5 r6, r4 |
| 476 | orr r3, r2, r2, lsl #16 |
| 477 | |
| 478 | do_14_7_7_4 r9, r4, r7, r6 |
| 479 | orr r2, r2, r2, lsr #16 |
| 480 | mov r2, r2, lsl #16 |
| 481 | orr r2, r2, r3, lsr #16 |
| 482 | str r2, [r0, #-240*2]! @ 6,14 |
| 483 | |
| 484 | unpack_hi r4, r11 |
| 485 | |
| 486 | do_14_7_7_4 r9, r5, r7, r4 |
| 487 | orr r3, r2, r2, lsl #16 |
| 488 | |
| 489 | do_3_5 r4, r5 |
| 490 | orr r2, r2, r2, lsr #16 |
| 491 | mov r3, r3, lsr #16 |
| 492 | orr r2, r3, r2, lsl #16 |
| 493 | str r2, [r0, #4] @ 22,30 |
| 494 | |
| 495 | do_3_5 r6, r7 |
| 496 | orr r2, r2, r2, lsr #16 |
| 497 | mov r3, r10, lsr #16 |
| 498 | orr r2, r3, r2, lsl #16 |
| 499 | str r2, [r0, #-240*2]! @ 7,15 |
| 500 | |
| 501 | do_3_5 r4, r7 |
| 502 | orr r2, r2, r2, lsl #16 |
| 503 | mov r3, r11, lsr #16 |
| 504 | mov r3, r3, lsl #16 |
| 505 | orr r2, r3, r2, lsr #16 |
| 506 | str r2, [r0, #4] @ 23,31 |
| 507 | |
| 508 | subs r8, r8, #1 |
| 509 | add r1, r1, #12 |
| 510 | bne uar_loop |
| 511 | |
| 512 | ldmfd sp!,{r4-r11,pc} |
| 513 | |
| 514 | |
| 515 | @ bonus function |
| 516 | |
| 517 | @ input: r2-r5 |
| 518 | @ output: r7,r8 |
| 519 | @ trash: r6 |
| 520 | .macro rb_line_low |
| 521 | mov r6, r2, lsl #16 |
| 522 | mov r7, r3, lsl #16 |
| 523 | orr r7, r7, r6, lsr #16 |
| 524 | mov r6, r4, lsl #16 |
| 525 | mov r8, r5, lsl #16 |
| 526 | orr r8, r8, r6, lsr #16 |
| 527 | .endm |
| 528 | |
| 529 | .macro rb_line_hi |
| 530 | mov r6, r2, lsr #16 |
| 531 | mov r7, r3, lsr #16 |
| 532 | orr r7, r6, r7, lsl #16 |
| 533 | mov r6, r4, lsr #16 |
| 534 | mov r8, r5, lsr #16 |
| 535 | orr r8, r6, r8, lsl #16 |
| 536 | .endm |
| 537 | |
| 538 | .global do_rotated_blit @ void *dst, void *linesx4, u32 y |
| 539 | do_rotated_blit: |
| 540 | stmfd sp!,{r4-r8,lr} |
| 541 | |
| 542 | add r0, r0, #(240*320)*2 |
| 543 | sub r0, r0, #(240*40)*2 |
| 544 | sub r0, r0, #(240-40+4)*2 @ y starts from 4 |
| 545 | add r0, r0, r2, lsl #1 |
| 546 | |
| 547 | mov lr, #240/4 |
| 548 | |
| 549 | rotated_blit_loop: |
| 550 | ldr r2, [r1, #240*0*2] |
| 551 | ldr r3, [r1, #240*1*2] |
| 552 | ldr r4, [r1, #240*2*2] |
| 553 | ldr r5, [r1, #240*3*2] |
| 554 | rb_line_low |
| 555 | stmia r0, {r7,r8} |
| 556 | sub r0, r0, #240*2 |
| 557 | rb_line_hi |
| 558 | stmia r0, {r7,r8} |
| 559 | sub r0, r0, #240*2 |
| 560 | |
| 561 | ldr r2, [r1, #240*0*2+4] |
| 562 | ldr r3, [r1, #240*1*2+4] |
| 563 | ldr r4, [r1, #240*2*2+4] |
| 564 | ldr r5, [r1, #240*3*2+4] |
| 565 | rb_line_low |
| 566 | stmia r0, {r7,r8} |
| 567 | sub r0, r0, #240*2 |
| 568 | rb_line_hi |
| 569 | stmia r0, {r7,r8} |
| 570 | sub r0, r0, #240*2 |
| 571 | |
| 572 | subs lr, lr, #1 |
| 573 | add r1, r1, #8 |
| 574 | bne rotated_blit_loop |
| 575 | |
| 576 | ldmfd sp!,{r4-r8,pc} |
| 577 | |
| 578 | @ vim:filetype=armasm |
| 579 | |