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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
int32_t gWidth;
int32_t gHeight;
rs_allocation gIn;
float gCoeffs[9];
uchar4 __attribute__((kernel)) root(uint32_t x, uint32_t y) {
uint32_t x1 = min((int32_t)x+1, gWidth-1);
uint32_t x2 = max((int32_t)x-1, 0);
uint32_t y1 = min((int32_t)y+1, gHeight-1);
uint32_t y2 = max((int32_t)y-1, 0);
float4 sum = convert_float4(rsGetElementAt_uchar4(gIn, x1, y1)) * gCoeffs[0];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y1)) * gCoeffs[1];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y1)) * gCoeffs[2];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x1, y)) * gCoeffs[3];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y)) * gCoeffs[4];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y)) * gCoeffs[5];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x1, y2)) * gCoeffs[6];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y2)) * gCoeffs[7];
sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y2)) * gCoeffs[8];
sum = clamp(sum, 0.f, 255.f);
return convert_uchar4(sum);
}
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