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#pragma version(1)
18#pragma rs java_package_name(com.android.rs.levels)
19
20float inBlack;
21float outBlack;
22float inWMinInB;
23float outWMinOutB;
24float overInWMinInB;
25float gamma;
26rs_matrix3x3 colorMat;
27
28void root(const uchar4 *in, uchar4 *out, uint32_t x, uint32_t y) {
29    float3 pixel = convert_float4(in[0]).rgb;
30    pixel = rsMatrixMultiply(&colorMat, pixel);
31    pixel = clamp(pixel, 0.f, 255.f);
32    pixel = (pixel - inBlack) * overInWMinInB;
33    if (gamma != 1.0f)
34        pixel = pow(pixel, (float3)gamma);
35    pixel = pixel * outWMinOutB + outBlack;
36    pixel = clamp(pixel, 0.f, 255.f);
37    out->xyz = convert_uchar3(pixel);
38    out->w = 0xff;
39}
40
41