1 /* 2 This file is part of darktable, 3 Copyright (C) 2009-2021 darktable developers. 4 5 darktable is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, either version 3 of the License, or 8 (at your option) any later version. 9 10 darktable is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with darktable. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #pragma once 20 21 #include <stdlib.h> 22 23 // default number of iterations to run for dt_box_mean 24 #define BOX_ITERATIONS 8 25 26 // flag to add to number of channels to request the slower but more accurate version using Kahan (compensated) 27 // summation 28 #define BOXFILTER_KAHAN_SUM 0x1000000 29 30 // ch = number of channels per pixel. Supported values: 1, 2, 4, and 4|Kahan 31 void dt_box_mean(float *const buf, const size_t height, const size_t width, const int ch, 32 const int radius, const unsigned interations); 33 // run a single iteration horizonally over a single row. Supported values for ch: 4|Kahan 34 // 'scratch' must point at a buffer large enough to hold ch*width floats, or be NULL 35 void dt_box_mean_horizontal(float *const restrict buf, const size_t width, const int ch, const int radius, 36 float *const restrict scratch); 37 // run a single iteration vertically over the entire image. Supported values for ch: 4|Kahan 38 void dt_box_mean_vertical(float *const buf, const size_t height, const size_t width, const int ch, const int radius); 39 40 void dt_box_min(float *const buf, const size_t height, const size_t width, const int ch, const int radius); 41 void dt_box_max(float *const buf, const size_t height, const size_t width, const int ch, const int radius); 42 43