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 | #include "warp_helpers.h" |
| 26 | |
| 27 | /** Transforms four 2D coordinates. This is used to map the output coordinates to the input coordinates. |
| 28 | * |
| 29 | * @param[in] coord 2D coordinates to transform. |
| 30 | * @param[in] scale input/output scale ratio |
| 31 | * |
| 32 | * @return a float8 containing 4 2D transformed values in the input image. |
| 33 | */ |
| 34 | inline const float8 transform_nearest(const float2 coord, const float2 scale) |
| 35 | { |
| 36 | const float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0); |
| 37 | const float4 new_x = (in_x_coords + ((float4)(0.5f))) * (float4)(scale.s0); |
| 38 | const float4 new_y = (float4)((coord.s1 + 0.5f) * scale.s1); |
| 39 | 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); |
| 40 | } |
| 41 | |
| 42 | /** Transforms four 2D coordinates. This is used to map the output coordinates to the input coordinates. |
| 43 | * |
| 44 | * @param[in] coord 2D coordinates to transform. |
| 45 | * @param[in] scale input/output scale ratio |
| 46 | * |
| 47 | * @return a float8 containing 4 2D transformed values in the input image. |
| 48 | */ |
| 49 | inline const float8 transform_bilinear(const float2 coord, const float2 scale) |
| 50 | { |
| 51 | const float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0); |
| 52 | const float4 new_x = (in_x_coords + ((float4)(0.5f))) * (float4)(scale.s0) - (float4)(0.5f); |
| 53 | const float4 new_y = (float4)((coord.s1 + 0.5f) * scale.s1 - 0.5f); |
| 54 | 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); |
| 55 | } |
| 56 | |
| 57 | /** Performs an affine transformation on an image interpolating with the NEAREAST NEIGHBOUR method. Input and output are single channel U8 or S16. |
| 58 | * |
| 59 | * @param[in] in_ptr Pointer to the source image. Supported data types: U8, S16. |
| 60 | * @param[in] in_stride_x Stride of the source image in X dimension (in bytes) |
| 61 | * @param[in] in_step_x src_stride_x * number of elements along X processed per workitem(in bytes) |
| 62 | * @param[in] in_stride_y Stride of the source image in Y dimension (in bytes) |
| 63 | * @param[in] in_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) |
| 64 | * @param[in] in_offset_first_element_in_bytes The offset of the first element in the source image |
| 65 | * @param[out] out_ptr Pointer to the destination image. Supported data types: U8, S16. (Must be the same as the input) |
| 66 | * @param[in] out_stride_x Stride of the destination image in X dimension (in bytes) |
| 67 | * @param[in] out_step_x dst_stride_x * number of elements along X processed per workitem(in bytes) |
| 68 | * @param[in] out_stride_y Stride of the destination image in Y dimension (in bytes) |
| 69 | * @param[in] out_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes) |
| 70 | * @param[in] out_offset_first_element_in_bytes The offset of the first element in the destination image |
| 71 | * @param[in] input_width Input image width |
| 72 | * @param[in] input_height Input image height |
| 73 | * @param[in] output_width Output image width |
| 74 | * @param[in] output_height Output image height |
| 75 | */ |
| 76 | __kernel void scale_nearest_neighbour( |
| 77 | IMAGE_DECLARATION(in), |
| 78 | IMAGE_DECLARATION(out), |
| 79 | const float input_width, |
| 80 | const float input_height, |
| 81 | const float output_width, |
| 82 | const float output_height) |
| 83 | { |
| 84 | Image in = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in); |
| 85 | Image out = CONVERT_TO_IMAGE_STRUCT(out); |
| 86 | const float2 r = (float2)(input_width / output_width, input_height / output_height); |
| 87 | const float8 tc = clamp_to_border(transform_nearest(get_current_coords(), r), input_width, input_height); |
| 88 | vstore4(read_texels4(&in, convert_int8(tc)), 0, (__global DATA_TYPE *)out.ptr); |
| 89 | } |
| 90 | |
| 91 | /** Performs an affine transformation on an image interpolating with the BILINEAR method. |
| 92 | * |
| 93 | * @param[in] in_ptr Pointer to the source image. Supported data types: U8, S16. |
| 94 | * @param[in] in_stride_x Stride of the source image in X dimension (in bytes) |
| 95 | * @param[in] in_step_x src_stride_x * number of elements along X processed per workitem(in bytes) |
| 96 | * @param[in] in_stride_y Stride of the source image in Y dimension (in bytes) |
| 97 | * @param[in] in_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) |
| 98 | * @param[in] in_offset_first_element_in_bytes The offset of the first element in the source image |
| 99 | * @param[out] out_ptr Pointer to the destination image. Supported data types: U8, S16. (Must be the same as the input) |
| 100 | * @param[in] out_stride_x Stride of the destination image in X dimension (in bytes) |
| 101 | * @param[in] out_step_x dst_stride_x * number of elements along X processed per workitem(in bytes) |
| 102 | * @param[in] out_stride_y Stride of the destination image in Y dimension (in bytes) |
| 103 | * @param[in] out_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes) |
| 104 | * @param[in] out_offset_first_element_in_bytes The offset of the first element in the destination image |
| 105 | * @param[in] input_width Input image width |
| 106 | * @param[in] input_height Input image height |
| 107 | * @param[in] output_width Output image width |
| 108 | * @param[in] output_height Output image height |
| 109 | */ |
| 110 | __kernel void scale_bilinear( |
| 111 | IMAGE_DECLARATION(in), |
| 112 | IMAGE_DECLARATION(out), |
| 113 | const float input_width, |
| 114 | const float input_height, |
| 115 | const float output_width, |
| 116 | const float output_height) |
| 117 | { |
| 118 | Image in = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in); |
| 119 | Image out = CONVERT_TO_IMAGE_STRUCT(out); |
| 120 | const float2 r = (float2)(input_width / output_width, input_height / output_height); |
| 121 | const float8 tc = clamp_to_border(transform_bilinear(get_current_coords(), r), input_width, input_height); |
| 122 | vstore4(bilinear_interpolate(&in, tc, input_width, input_height), 0, (__global DATA_TYPE *)out.ptr); |
| 123 | } |