2 * Copyright (c) 2016, 2017 ARM Limited.
4 * SPDX-License-Identifier: MIT
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:
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
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
26 /** This function erodes an input image image.
28 * @param[in] src_ptr Pointer to the source image. Supported data types: U8
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: U8
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
42 IMAGE_DECLARATION(src),
43 IMAGE_DECLARATION(dst))
45 Image src = CONVERT_TO_IMAGE_STRUCT(src);
46 Image dst = CONVERT_TO_IMAGE_STRUCT(dst);
48 uchar16 top = vload16(0, offset(&src, -1, -1));
49 uchar16 middle = vload16(0, offset(&src, -1, 0));
50 uchar16 bottom = vload16(0, offset(&src, -1, 1));
52 uchar16 tmp = min(top, min(middle, bottom));
53 uchar8 out = min(tmp.s01234567, min(tmp.s12345678, tmp.s23456789));
55 vstore8(out, 0, dst.ptr);