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/*
* Copyright (C) 2013 Unknown
*
* 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.
*/
#pragma version(1)
#pragma rs java_package_name(com.android.gallery3d.filtershow.filters)
uint32_t inputWidth;
uint32_t inputHeight;
float centerx;
float centery;
float radiusx;
float radiusy;
float strength;
float finalBright;
float finalSaturation;
float finalContrast;
float finalSubtract;
rs_matrix3x3 colorMatrix;
float scalex;
float scaley;
float offset;
static const float Rf = 0.2999f;
static const float Gf = 0.587f;
static const float Bf = 0.114f;
void setupVignetteParams() {
scalex = 1.f / radiusx;
scaley = 1.f / radiusy;
float S = 1 + finalSaturation / 100.f;
float MS = 1 - S;
float Rt = Rf * MS;
float Gt = Gf * MS;
float Bt = Bf * MS;
float b = 1 + finalBright / 100.f;
float c = 1 + finalContrast / 100.f;
b *= c;
offset = .5f - c / 2.f - finalSubtract / 100.f;
rsMatrixSet(&colorMatrix, 0, 0, b * (Rt + S));
rsMatrixSet(&colorMatrix, 1, 0, b * Gt);
rsMatrixSet(&colorMatrix, 2, 0, b * Bt);
rsMatrixSet(&colorMatrix, 0, 1, b * Rt);
rsMatrixSet(&colorMatrix, 1, 1, b * (Gt + S));
rsMatrixSet(&colorMatrix, 2, 1, b * Bt);
rsMatrixSet(&colorMatrix, 0, 2, b * Rt);
rsMatrixSet(&colorMatrix, 1, 2, b * Gt);
rsMatrixSet(&colorMatrix, 2, 2, b * (Bt + S));
}
uchar4 __attribute__((kernel)) vignette(const uchar4 in, uint32_t x, uint32_t y) {
float4 pixel = rsUnpackColor8888(in);
float radx = (x - centerx) * scalex;
float rady = (y - centery) * scaley;
float dist = strength * (sqrt(radx * radx + rady * rady) - 1.f);
float t = (1.f + dist / sqrt(1.f + dist* dist)) * .5f;
float4 wsum = pixel;
wsum.xyz = wsum.xyz * (1 - t) + t * (rsMatrixMultiply(&colorMatrix, wsum.xyz) + offset);
wsum.a = 1.0f;
uchar4 out = rsPackColorTo8888(clamp(wsum, 0.f, 1.0f));
return out;
}
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