1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright (c) 2016, 2017 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "helpers.h"
#include "warp_helpers.h"
/** Transforms four 2D coordinates. This is used to map the output coordinates to the input coordinates.
*
* @param[in] coord 2D coordinates to transform.
* @param[in] scale input/output scale ratio
*
* @return a float8 containing 4 2D transformed values in the input image.
*/
inline const float8 transform_nearest(const float2 coord, const float2 scale)
{
const float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0);
const float4 new_x = (in_x_coords + ((float4)(0.5f))) * (float4)(scale.s0);
const float4 new_y = (float4)((coord.s1 + 0.5f) * scale.s1);
return (float8)(new_x.s0, new_y.s0, new_x.s1, new_y.s1, new_x.s2, new_y.s2, new_x.s3, new_y.s3);
}
/** Transforms four 2D coordinates. This is used to map the output coordinates to the input coordinates.
*
* @param[in] coord 2D coordinates to transform.
* @param[in] scale input/output scale ratio
*
* @return a float8 containing 4 2D transformed values in the input image.
*/
inline const float8 transform_bilinear(const float2 coord, const float2 scale)
{
const float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0);
#ifdef SAMPLING_POLICY_TOP_LEFT
const float4 new_x = in_x_coords * (float4)(scale.s0);
const float4 new_y = (float4)(coord.s1 * scale.s1);
return (float8)(new_x.s0, new_y.s0, new_x.s1, new_y.s1, new_x.s2, new_y.s2, new_x.s3, new_y.s3);
#elif SAMPLING_POLICY_CENTER
const float4 new_x = (in_x_coords + ((float4)(0.5f))) * (float4)(scale.s0) - (float4)(0.5f);
const float4 new_y = (float4)((coord.s1 + 0.5f) * scale.s1 - 0.5f);
return (float8)(new_x.s0, new_y.s0, new_x.s1, new_y.s1, new_x.s2, new_y.s2, new_x.s3, new_y.s3);
#else /* SAMPLING_POLICY */
#error("Unsupported sampling policy");
#endif /* SAMPLING_POLICY */
}
/** Performs an affine transformation on an image interpolating with the NEAREAST NEIGHBOUR method. Input and output are single channel U8 or S16.
*
* @note Sampling policy to used is passed as -DSAMPLING_POLICY_(TYPE) e.g. -DSAMPLING_POLICY_TOP_LEFT
*
* @param[in] in_ptr Pointer to the source image. Supported data types: U8, S16.
* @param[in] in_stride_x Stride of the source image in X dimension (in bytes)
* @param[in] in_step_x src_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] in_stride_y Stride of the source image in Y dimension (in bytes)
* @param[in] in_step_y src_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] in_offset_first_element_in_bytes The offset of the first element in the source image
* @param[out] out_ptr Pointer to the destination image. Supported data types: U8, S16. (Must be the same as the input)
* @param[in] out_stride_x Stride of the destination image in X dimension (in bytes)
* @param[in] out_step_x dst_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] out_stride_y Stride of the destination image in Y dimension (in bytes)
* @param[in] out_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] out_offset_first_element_in_bytes The offset of the first element in the destination image
* @param[in] input_width Input image width
* @param[in] input_height Input image height
* @param[in] scale_x The scale factor along x dimension
* @param[in] scale_y The scale factor along y dimension
*/
__kernel void scale_nearest_neighbour(
IMAGE_DECLARATION(in),
IMAGE_DECLARATION(out),
const float input_width,
const float input_height,
const float scale_x,
const float scale_y)
{
Image in = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in);
Image out = CONVERT_TO_IMAGE_STRUCT(out);
const float2 r = (float2)(scale_x, scale_y);
const float8 tc = clamp_to_border_with_size(transform_nearest(get_current_coords(), r), input_width, input_height, BORDER_SIZE);
vstore4(read_texels4(&in, convert_int8(tc)), 0, (__global DATA_TYPE *)out.ptr);
}
/** Performs an affine transformation on an image interpolating with the BILINEAR method.
*
* @note Sampling policy to used is passed as -DSAMPLING_POLICY_(TYPE) e.g. -DSAMPLING_POLICY_TOP_LEFT
*
* @param[in] in_ptr Pointer to the source image. Supported data types: U8, S16.
* @param[in] in_stride_x Stride of the source image in X dimension (in bytes)
* @param[in] in_step_x src_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] in_stride_y Stride of the source image in Y dimension (in bytes)
* @param[in] in_step_y src_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] in_offset_first_element_in_bytes The offset of the first element in the source image
* @param[out] out_ptr Pointer to the destination image. Supported data types: U8, S16. (Must be the same as the input)
* @param[in] out_stride_x Stride of the destination image in X dimension (in bytes)
* @param[in] out_step_x dst_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] out_stride_y Stride of the destination image in Y dimension (in bytes)
* @param[in] out_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] out_offset_first_element_in_bytes The offset of the first element in the destination image
* @param[in] input_width Input image width
* @param[in] input_height Input image height
* @param[in] scale_x The scale factor along x dimension
* @param[in] scale_y The scale factor along y dimension
*/
__kernel void scale_bilinear(
IMAGE_DECLARATION(in),
IMAGE_DECLARATION(out),
const float input_width,
const float input_height,
const float scale_x,
const float scale_y)
{
Image in = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in);
Image out = CONVERT_TO_IMAGE_STRUCT(out);
const float2 r = (float2)(scale_x, scale_y);
const float8 tc = transform_bilinear(get_current_coords(), r);
vstore4(bilinear_interpolate_with_border(&in, tc, input_width, input_height, BORDER_SIZE), 0, (__global DATA_TYPE *)out.ptr);
}
|
