| /* |
| * 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 RS_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); |
| } |
| |
| |