| 313 | } |
| 314 | |
| 315 | static unsigned long |
| 316 | vesa_ReadPixel32(unsigned x, unsigned y) |
| 317 | { |
| 318 | unsigned long offset = y * vesa_scan_line + x * vesa_pixel_bytes; |
| 319 | unsigned long addr, color; |
| 320 | unsigned i; |
| 321 | |
| 322 | if (vesa_segment != 0) { |
| 323 | /* Linear frame buffer in use */ |
| 324 | switch (vesa_pixel_size) { |
| 325 | case 8: |
| 326 | color = _farpeekb(vesa_segment, offset); |
| 327 | break; |
| 328 | |
| 329 | case 15: |
| 330 | case 16: |
| 331 | color = _farpeekw(vesa_segment, offset); |
| 332 | break; |
| 333 | |
| 334 | case 24: |
| 335 | /* Don't cross a 4 byte boundary if it can be avoided */ |
| 336 | if (offset & 1) { |
| 337 | color = _farpeekl(vesa_segment, offset - 1) >> 8; |
| 338 | } else { |
| 339 | color = _farpeekl(vesa_segment, offset) & 0xFFFFFFFF; |
| 340 | } |
| 341 | break; |
| 342 | |
| 343 | case 32: |
| 344 | color = _farpeekl(vesa_segment, offset); |
| 345 | break; |
| 346 | |
| 347 | default: /* Shouldn't happen */ |
| 348 | color = 0; |
| 349 | break; |
| 350 | } |
| 351 | } else { |
| 352 | switch (vesa_pixel_size) { |
| 353 | case 8: |
| 354 | addr = vesa_SetWindow(vesa_read_win, offset); |
| 355 | color = _farpeekb(_dos_ds, addr); |
| 356 | break; |
| 357 | |
| 358 | case 15: |
| 359 | case 16: |
| 360 | addr = vesa_SetWindow(vesa_read_win, offset); |
| 361 | color = _farpeekw(_dos_ds, addr); |
| 362 | break; |
| 363 | |
| 364 | case 24: |
| 365 | /* Pixel may cross a window boundary */ |
| 366 | color = 0; |
| 367 | for (i = 0; i < 3; ++i) { |
| 368 | addr = vesa_SetWindow(vesa_read_win, offset + i); |
| 369 | color |= (unsigned long) _farpeekb(_dos_ds, addr) << (i * 8); |
| 370 | } |
| 371 | break; |
| 372 |
no test coverage detected