| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "ip.rsh" |
| #pragma rs_fp_relaxed |
| |
| static float brightM = 0.f; |
| static float brightC = 0.f; |
| |
| void setBright(float v) { |
| brightM = pow(2.f, v / 100.f); |
| brightC = 127.f - brightM * 127.f; |
| } |
| |
| void contrast(const uchar4 *in, uchar4 *out) |
| { |
| #if 0 |
| out->r = rsClamp((int)(brightM * in->r + brightC), 0, 255); |
| out->g = rsClamp((int)(brightM * in->g + brightC), 0, 255); |
| out->b = rsClamp((int)(brightM * in->b + brightC), 0, 255); |
| #else |
| float3 v = convert_float3(in->rgb) * brightM + brightC; |
| out->rgb = convert_uchar3(clamp(v, 0.f, 255.f)); |
| #endif |
| } |