xref: /frameworks/rs/java/tests/ImageProcessing/src/com/android/rs/image/convolve5x5.rs

/*
 * 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[25];

uchar4 RS_KERNEL root(uint32_t x, uint32_t y) {
    uint32_t x0 = max((int32_t)x-2, 0);
    uint32_t x1 = max((int32_t)x-1, 0);
    uint32_t x2 = x;
    uint32_t x3 = min((int32_t)x+1, gWidth-1);
    uint32_t x4 = min((int32_t)x+2, gWidth-1);

    uint32_t y0 = max((int32_t)y-2, 0);
    uint32_t y1 = max((int32_t)y-1, 0);
    uint32_t y2 = y;
    uint32_t y3 = min((int32_t)y+1, gHeight-1);
    uint32_t y4 = min((int32_t)y+2, gHeight-1);

    float4 sum = convert_float4(rsGetElementAt_uchar4(gIn, x0, y0)) * gCoeffs[0]
               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y0)) * gCoeffs[1]
               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y0)) * gCoeffs[2]
               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y0)) * gCoeffs[3]
               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y0)) * gCoeffs[4]

               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y1)) * gCoeffs[5]
               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y1)) * gCoeffs[6]
               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y1)) * gCoeffs[7]
               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y1)) * gCoeffs[8]
               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y1)) * gCoeffs[9]

               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y2)) * gCoeffs[10]
               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y2)) * gCoeffs[11]
               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y2)) * gCoeffs[12]
               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y2)) * gCoeffs[13]
               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y2)) * gCoeffs[14]

               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y3)) * gCoeffs[15]
               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y3)) * gCoeffs[16]
               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y3)) * gCoeffs[17]
               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y3)) * gCoeffs[18]
               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y3)) * gCoeffs[19]

               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y4)) * gCoeffs[20]
               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y4)) * gCoeffs[21]
               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y4)) * gCoeffs[22]
               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y4)) * gCoeffs[23]
               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y4)) * gCoeffs[24];

    return convert_uchar4(clamp(sum, 0.f, 255.f));
}