| Anthony Barbier | 6ff3b19 | 2017-09-04 18:44:23 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, 2017 ARM Limited. |
| 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | #include "helpers.h" |
| 25 | |
| 26 | /** This function performs Non maxima suppression over a 3x3 window on a given image. |
| 27 | * |
| 28 | * @param[in] src_ptr Pointer to the source image. Supported data types: F32 |
| 29 | * @param[in] src_stride_x Stride of the source image in X dimension (in bytes) |
| 30 | * @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes) |
| 31 | * @param[in] src_stride_y Stride of the source image in Y dimension (in bytes) |
| 32 | * @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) |
| 33 | * @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image |
| 34 | * @param[out] dst_ptr Pointer to the destination image. Supported data types: F32 |
| 35 | * @param[in] dst_stride_x Stride of the destination image in X dimension (in bytes) |
| 36 | * @param[in] dst_step_x dst_stride_x * number of elements along X processed per workitem(in bytes) |
| 37 | * @param[in] dst_stride_y Stride of the destination image in Y dimension (in bytes) |
| 38 | * @param[in] dst_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes) |
| 39 | * @param[in] dst_offset_first_element_in_bytes The offset of the first element in the destination image |
| 40 | */ |
| 41 | __kernel void non_max_suppression( |
| 42 | IMAGE_DECLARATION(src), |
| 43 | IMAGE_DECLARATION(dst)) |
| 44 | { |
| 45 | Image src = CONVERT_TO_IMAGE_STRUCT(src); |
| 46 | Image dst = CONVERT_TO_IMAGE_STRUCT(dst); |
| 47 | |
| 48 | VEC_DATA_TYPE(DATA_TYPE, 8) |
| 49 | vc = vload8(0, (__global DATA_TYPE *)src.ptr); |
| 50 | |
| 51 | if(all(vc == (DATA_TYPE)0)) |
| 52 | { |
| 53 | vstore8(0, 0, (__global DATA_TYPE *)dst.ptr); |
| 54 | |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | VEC_DATA_TYPE(DATA_TYPE, 16) |
| 59 | nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, -1)); |
| 60 | VEC_DATA_TYPE(DATA_TYPE, 8) |
| 61 | out = select((DATA_TYPE)0, vc, (vc >= nc.s01234567) && (vc >= nc.s12345678) && (vc >= nc.s23456789)); |
| 62 | |
| 63 | nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, 0)); |
| 64 | out = select((DATA_TYPE)0, out, (vc >= nc.s01234567) && (vc > nc.s23456789)); |
| 65 | |
| 66 | nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, +1)); |
| 67 | out = select((DATA_TYPE)0, out, (vc > nc.s01234567) && (vc > nc.s12345678) && (vc > nc.s23456789)); |
| 68 | |
| 69 | vstore8(out, 0, (__global DATA_TYPE *)dst.ptr); |
| 70 | } |