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 19static float brightM = 0.f; 20static float brightC = 0.f; 21 22void setBright(float v) { 23 brightM = pow(2.f, v / 100.f); 24 brightC = 127.f - brightM * 127.f; 25} 26 27void contrast(const uchar4 *in, uchar4 *out) 28{ 29#if 0 30 out->r = rsClamp((int)(brightM * in->r + brightC), 0, 255); 31 out->g = rsClamp((int)(brightM * in->g + brightC), 0, 255); 32 out->b = rsClamp((int)(brightM * in->b + brightC), 0, 255); 33#else 34 float3 v = convert_float3(in->rgb) * brightM + brightC; 35 out->rgb = convert_uchar3(clamp(v, 0.f, 255.f)); 36#endif 37} 38