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/*
* 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
rs_allocation gBlur;
static float gOverWm1;
static float gOverHm1;
static uchar gLutR[256];
static uchar gLutG[256];
static uchar gLutB[256];
void setup() {
int w = rsAllocationGetDimX(gBlur);
int h = rsAllocationGetDimY(gBlur);
gOverWm1 = 1.f / w;
gOverHm1 = 1.f / h;
for (int x=0; x < 256; x++) {
gLutR[x] = x;//255-x;
gLutG[x] = x;//255-x;
gLutB[x] = x;//255-x;
}
}
uchar4 RS_KERNEL process(uchar4 in, uint32_t x, uint32_t y) {
float2 xyDist;
xyDist.x = (x * gOverWm1 - 0.5f);
xyDist.y = (y * gOverHm1 - 0.5f);
// color
float4 v1 = rsUnpackColor8888(in);
float4 v2 = rsUnpackColor8888(rsGetElementAt_uchar4(gBlur, x, y));
float dist = dot(xyDist, xyDist) * 1.4f;
float pdist = native_powr(dist, 2.7f * 0.5f);
//float pdist = powr(dist, 2.7f * 0.5f);
pdist = clamp(pdist, 0.f, 1.f);
v1 = mix(v1, v2, dist * 2.f);
v1 *= 1.f - pdist;
// apply curve
uchar4 out = rsPackColorTo8888(v1);
out.r = gLutR[out.r];
out.g = gLutG[out.g];
out.b = gLutB[out.b];
return out;
}
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