1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "ip.rsh" 18 #pragma rs_fp_relaxed 19 20 static float sr = 0.f; 21 static float sg = 0.f; 22 static float sb = 0.f; 23 24 void prepareBwFilter(uint32_t rw, uint32_t gw, uint32_t bw) { 25 26 sr = rw; 27 sg = gw; 28 sb = bw; 29 30 float imageMin = min(sg,sb); 31 imageMin = fmin(sr,imageMin); 32 float imageMax = max(sg,sb); 33 imageMax = fmax(sr,imageMax); 34 float avg = (imageMin + imageMax)/2; 35 sb /= avg; 36 sg /= avg; 37 sr /= avg; 38 39 } 40 41 void bwFilterKernel(const uchar4 *in, uchar4 *out) { 42 float r = in->r * sr; 43 float g = in->g * sg; 44 float b = in->b * sb; 45 float localMin, localMax, avg; 46 localMin = fmin(g,b); 47 localMin = fmin(r,localMin); 48 localMax = fmax(g,b); 49 localMax = fmax(r,localMax); 50 avg = (localMin+localMax) * 0.5f; 51 out->r = out->g = out->b = clamp((int) avg, 0, 255); 52 } 53
