1 /*
2 * Copyright (c) 2016, 2017, 2021 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 /** Clamps the given coordinates to the borders according to the border size.
27 *
28 * @param[in] coords Vector of 2D coordinates to clamp. Even positions are X coords, odd positions are Y coords.
29 * @param[in] width Width of the image
30 * @param[in] height Height of the image
31 * @param[in] border_size Border size of the image
32 *
33 */
clamp_to_border_with_size(float8 coords,const float width,const float height,const float border_size)34 inline const float8 clamp_to_border_with_size(float8 coords, const float width, const float height, const float border_size)
35 {
36 const float4 clamped_x = clamp(coords.even, 0.0f - border_size, width - 1 + border_size);
37 const float4 clamped_y = clamp(coords.odd, 0.0f - border_size, height - 1 + border_size);
38 return (float8)(clamped_x.s0, clamped_y.s0, clamped_x.s1, clamped_y.s1, clamped_x.s2, clamped_y.s2, clamped_x.s3, clamped_y.s3);
39 }
40
41 /** Clamps the given coordinates to the borders.
42 *
43 * @param[in] coords Vector of 2D coordinates to clamp. Even positions are X coords, odd positions are Y coords.
44 * @param[in] width Width of the image
45 * @param[in] height Height of the image
46 *
47 */
clamp_to_border(float8 coords,const float width,const float height)48 inline const float8 clamp_to_border(float8 coords, const float width, const float height)
49 {
50 return clamp_to_border_with_size(coords, width, height, 1);
51 }
52
53 /** Reads four texels from the input image. The coords vector is used to determine which texels to be read.
54 *
55 * @param[in] in Pointer to the source image.
56 * @param[in] coords Vector of coordinates to be read from the image.
57 */
read_texels4(const Image * in,const int8 coords)58 inline const VEC_DATA_TYPE(DATA_TYPE, 4) read_texels4(const Image *in, const int8 coords)
59 {
60 return (VEC_DATA_TYPE(DATA_TYPE, 4))(*((__global DATA_TYPE *)offset(in, coords.s0, coords.s1)),
61 *((__global DATA_TYPE *)offset(in, coords.s2, coords.s3)),
62 *((__global DATA_TYPE *)offset(in, coords.s4, coords.s5)),
63 *((__global DATA_TYPE *)offset(in, coords.s6, coords.s7)));
64 }
65
66 /** Given a texel coordinates this function will return the following array of coordinates:
67 * [ P, right neighbour, below neighbour, below right neighbour ]
68 *
69 * @note No checks to see if the coordinates are out of the image are done here.
70 *
71 * @param[in] coord Input coordinates
72 *
73 * @return vector of 8 floats with the coordinates, even positions are x and odd y.
74 */
get_neighbour_coords(const float2 coord)75 inline const float8 get_neighbour_coords(const float2 coord)
76 {
77 return (float8)(/*tl*/ coord.s0, coord.s1, /*tr*/ coord.s0 + 1, coord.s1, /*bl*/ coord.s0, coord.s1 + 1, /*br*/ coord.s0 + 1, coord.s1 + 1);
78 }
79
80 /** Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the values
81 *
82 * @param[in] in Pointer to the source image.
83 * @param[in] coords Vector of four 2D coordinates. Even pos is x and odd y.
84 * @param[in] width Width of the image
85 * @param[in] height Height of the image
86 * @param[in] border_size Border size
87 */
bilinear_interpolate_with_border(const Image * in,const float8 coords,const float width,const float height,const float border_size)88 inline const VEC_DATA_TYPE(DATA_TYPE, 4) bilinear_interpolate_with_border(const Image *in, const float8 coords, const float width, const float height, const float border_size)
89 {
90 // If any of the 4 texels is out of the image's boundaries we use the border value (REPLICATE or CONSTANT) for any texel out of the image.
91
92 // Sets the 4x4 coordinates for each of the four input texels
93 const float8 fc = floor(coords);
94 const float16 c1 = (float16)(
95 clamp_to_border_with_size(get_neighbour_coords((float2)(fc.s0, fc.s1)), width, height, border_size),
96 clamp_to_border_with_size(get_neighbour_coords((float2)(fc.s2, fc.s3)), width, height, border_size));
97 const float16 c2 = (float16)(
98 clamp_to_border_with_size(get_neighbour_coords((float2)(fc.s4, fc.s5)), width, height, border_size),
99 clamp_to_border_with_size(get_neighbour_coords((float2)(fc.s6, fc.s7)), width, height, border_size));
100
101 // Loads the values from the input image
102 const float16 t = (float16)(
103 /* tl, tr, bl, br */
104 * ((__global DATA_TYPE *)offset(in, c1.s0, c1.s1)), *((__global DATA_TYPE *)offset(in, c1.s2, c1.s3)),
105 *((__global DATA_TYPE *)offset(in, c1.s4, c1.s5)), *((__global DATA_TYPE *)offset(in, c1.s6, c1.s7)),
106 *((__global DATA_TYPE *)offset(in, c1.s8, c1.s9)), *((__global DATA_TYPE *)offset(in, c1.sa, c1.sb)),
107 *((__global DATA_TYPE *)offset(in, c1.sc, c1.sd)), *((__global DATA_TYPE *)offset(in, c1.se, c1.sf)),
108 *((__global DATA_TYPE *)offset(in, c2.s0, c2.s1)), *((__global DATA_TYPE *)offset(in, c2.s2, c2.s3)),
109 *((__global DATA_TYPE *)offset(in, c2.s4, c2.s5)), *((__global DATA_TYPE *)offset(in, c2.s6, c2.s7)),
110 *((__global DATA_TYPE *)offset(in, c2.s8, c2.s9)), *((__global DATA_TYPE *)offset(in, c2.sa, c2.sb)),
111 *((__global DATA_TYPE *)offset(in, c2.sc, c2.sd)), *((__global DATA_TYPE *)offset(in, c2.se, c2.sf)));
112 const float8 a = coords - fc;
113 const float8 b = ((float8)(1.f)) - a;
114 const float4 fr = (float4)(
115 ((t.s0 * b.s0 * b.s1) + (t.s1 * a.s0 * b.s1) + (t.s2 * b.s0 * a.s1) + (t.s3 * a.s0 * a.s1)),
116 ((t.s4 * b.s2 * b.s3) + (t.s5 * a.s2 * b.s3) + (t.s6 * b.s2 * a.s3) + (t.s7 * a.s2 * a.s3)),
117 ((t.s8 * b.s4 * b.s5) + (t.s9 * a.s4 * b.s5) + (t.sa * b.s4 * a.s5) + (t.sb * a.s4 * a.s5)),
118 ((t.sc * b.s6 * b.s7) + (t.sd * a.s6 * b.s7) + (t.se * b.s6 * a.s7) + (t.sf * a.s6 * a.s7)));
119 return CONVERT(fr, VEC_DATA_TYPE(DATA_TYPE, 4));
120 }
121
122 /** Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the values
123 *
124 * @param[in] in Pointer to the source image.
125 * @param[in] coords Vector of four 2D coordinates. Even pos is x and odd y.
126 * @param[in] width Width of the image
127 * @param[in] height Height of the image
128 */
bilinear_interpolate(const Image * in,const float8 coords,const float width,const float height)129 inline const VEC_DATA_TYPE(DATA_TYPE, 4) bilinear_interpolate(const Image *in, const float8 coords, const float width, const float height)
130 {
131 return bilinear_interpolate_with_border(in, coords, width, height, 1);
132 }
133