| 353 | //========================================================stack_blur_gray8 |
| 354 | template<class Img> |
| 355 | void stack_blur_gray8(Img& img, unsigned rx, unsigned ry) |
| 356 | { |
| 357 | unsigned x, y, xp, yp, i; |
| 358 | unsigned stack_ptr; |
| 359 | unsigned stack_start; |
| 360 | |
| 361 | const int8u* src_pix_ptr; |
| 362 | int8u* dst_pix_ptr; |
| 363 | unsigned pix; |
| 364 | unsigned stack_pix; |
| 365 | unsigned sum; |
| 366 | unsigned sum_in; |
| 367 | unsigned sum_out; |
| 368 | |
| 369 | unsigned w = img.width(); |
| 370 | unsigned h = img.height(); |
| 371 | unsigned wm = w - 1; |
| 372 | unsigned hm = h - 1; |
| 373 | |
| 374 | unsigned div; |
| 375 | unsigned mul_sum; |
| 376 | unsigned shr_sum; |
| 377 | |
| 378 | pod_vector<int8u> stack; |
| 379 | |
| 380 | if(rx > 0) |
| 381 | { |
| 382 | if(rx > 254) rx = 254; |
| 383 | div = rx * 2 + 1; |
| 384 | mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[rx]; |
| 385 | shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[rx]; |
| 386 | stack.allocate(div); |
| 387 | |
| 388 | for(y = 0; y < h; y++) |
| 389 | { |
| 390 | sum = sum_in = sum_out = 0; |
| 391 | |
| 392 | src_pix_ptr = img.pix_ptr(0, y); |
| 393 | pix = *src_pix_ptr; |
| 394 | for(i = 0; i <= rx; i++) |
| 395 | { |
| 396 | stack[i] = pix; |
| 397 | sum += pix * (i + 1); |
| 398 | sum_out += pix; |
| 399 | } |
| 400 | for(i = 1; i <= rx; i++) |
| 401 | { |
| 402 | if(i <= wm) src_pix_ptr += Img::pix_step; |
| 403 | pix = *src_pix_ptr; |
| 404 | stack[i + rx] = pix; |
| 405 | sum += pix * (rx + 1 - i); |
| 406 | sum_in += pix; |
| 407 | } |
| 408 | |
| 409 | stack_ptr = rx; |
| 410 | xp = rx; |
| 411 | if(xp > wm) xp = wm; |
| 412 | src_pix_ptr = img.pix_ptr(xp, y); |