1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "ip.rsh" 18 #pragma rs_fp_relaxed 19 20 int32_t gWidth; 21 int32_t gHeight; 22 rs_allocation gIn; 23 24 float gCoeffs[9]; 25 26 uchar4 RS_KERNEL root(uint32_t x, uint32_t y) { 27 uint32_t x1 = min((int32_t)x+1, gWidth-1); 28 uint32_t x2 = max((int32_t)x-1, 0); 29 uint32_t y1 = min((int32_t)y+1, gHeight-1); 30 uint32_t y2 = max((int32_t)y-1, 0); 31 32 float4 sum = convert_float4(rsGetElementAt_uchar4(gIn, x1, y1)) * gCoeffs[0]; 33 sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y1)) * gCoeffs[1]; 34 sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y1)) * gCoeffs[2]; 35 sum += convert_float4(rsGetElementAt_uchar4(gIn, x1, y)) * gCoeffs[3]; 36 sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y)) * gCoeffs[4]; 37 sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y)) * gCoeffs[5]; 38 sum += convert_float4(rsGetElementAt_uchar4(gIn, x1, y2)) * gCoeffs[6]; 39 sum += convert_float4(rsGetElementAt_uchar4(gIn, x, y2)) * gCoeffs[7]; 40 sum += convert_float4(rsGetElementAt_uchar4(gIn, x2, y2)) * gCoeffs[8]; 41 42 sum = clamp(sum, 0.f, 255.f); 43 return convert_uchar4(sum); 44 } 45 46 47
