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/*
* Copyright (C) 2012 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)
#define MAX_CHANELS 7
#define MAX_HUE 4096
static const int ABITS = 4;
static const int HSCALE = 256;
static const int k1=255 << ABITS;
static const int k2=HSCALE << ABITS;
static const float Rf = 0.2999f;
static const float Gf = 0.587f;
static const float Bf = 0.114f;
rs_matrix3x3 colorMatrix_min;
rs_matrix3x3 colorMatrix_max;
int mNumberOfLines;
// input data
int saturation[MAX_CHANELS];
float sat[MAX_CHANELS];
float satLut[MAX_HUE];
// generated data
void setupGradParams() {
int master = saturation[0];
int max = master+saturation[1];
int min = max;
// calculate the minimum and maximum saturation
for (int i = 1; i < MAX_CHANELS; i++) {
int v = master+saturation[i];
if (max < v) {
max = v;
}
else if (min > v) {
min = v;
}
}
// generate a lookup table for all hue 0 to 4K which goes from 0 to 1 0=min sat 1 = max sat
min = min - 1;
for(int i = 0; i < MAX_HUE ; i++) {
float p = i * 6 / (float)MAX_HUE;
int ip = ((int)(p + .5f)) % 6;
int v = master + saturation[ip + 1];
satLut[i] = (v - min)/(float)(max - min);
}
float S = 1 + max / 100.f;
float MS = 1 - S;
float Rt = Rf * MS;
float Gt = Gf * MS;
float Bt = Bf * MS;
float b = 1.f;
// Generate 2 color matrix one at min sat and one at max
rsMatrixSet(&colorMatrix_max, 0, 0, b * (Rt + S));
rsMatrixSet(&colorMatrix_max, 1, 0, b * Gt);
rsMatrixSet(&colorMatrix_max, 2, 0, b * Bt);
rsMatrixSet(&colorMatrix_max, 0, 1, b * Rt);
rsMatrixSet(&colorMatrix_max, 1, 1, b * (Gt + S));
rsMatrixSet(&colorMatrix_max, 2, 1, b * Bt);
rsMatrixSet(&colorMatrix_max, 0, 2, b * Rt);
rsMatrixSet(&colorMatrix_max, 1, 2, b * Gt);
rsMatrixSet(&colorMatrix_max, 2, 2, b * (Bt + S));
S = 1 + min / 100.f;
MS = 1-S;
Rt = Rf * MS;
Gt = Gf * MS;
Bt = Bf * MS;
b = 1;
rsMatrixSet(&colorMatrix_min, 0, 0, b * (Rt + S));
rsMatrixSet(&colorMatrix_min, 1, 0, b * Gt);
rsMatrixSet(&colorMatrix_min, 2, 0, b * Bt);
rsMatrixSet(&colorMatrix_min, 0, 1, b * Rt);
rsMatrixSet(&colorMatrix_min, 1, 1, b * (Gt + S));
rsMatrixSet(&colorMatrix_min, 2, 1, b * Bt);
rsMatrixSet(&colorMatrix_min, 0, 2, b * Rt);
rsMatrixSet(&colorMatrix_min, 1, 2, b * Gt);
rsMatrixSet(&colorMatrix_min, 2, 2, b * (Bt + S));
}
static ushort rgb2hue( uchar4 rgb)
{
int iMin,iMax,chroma;
int ri = rgb.r;
int gi = rgb.g;
int bi = rgb.b;
short rv,rs,rh;
if (ri > gi) {
iMax = max (ri, bi);
iMin = min (gi, bi);
} else {
iMax = max (gi, bi);
iMin = min (ri, bi);
}
rv = (short) (iMax << ABITS);
if (rv == 0) {
return 0;
}
chroma = iMax - iMin;
rs = (short) ((k1 * chroma) / iMax);
if (rs == 0) {
return 0;
}
if ( ri == iMax ) {
rh = (short) ((k2 * (6 * chroma + gi - bi))/(6 * chroma));
if (rh >= k2) {
rh -= k2;
}
return rh;
}
if (gi == iMax) {
return(short) ((k2 * (2 * chroma + bi - ri)) / (6 * chroma));
}
return (short) ((k2 * (4 * chroma + ri - gi)) / (6 * chroma));
}
uchar4 __attribute__((kernel)) selectiveAdjust(const uchar4 in, uint32_t x,
uint32_t y) {
float4 pixel = rsUnpackColor8888(in);
float4 wsum = pixel;
int hue = rgb2hue(in);
float t = satLut[hue];
pixel.xyz = rsMatrixMultiply(&colorMatrix_min ,pixel.xyz) * (1 - t) +
t * (rsMatrixMultiply(&colorMatrix_max ,pixel.xyz));
pixel.a = 1.0f;
return rsPackColorTo8888(clamp(pixel, 0.f, 1.0f));
}
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