| /* |
| * 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); |
| 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); |
| } |
| |
| /** Performs an affine transformation on an image interpolating with the NEAREAST NEIGHBOUR method. Input and output are single channel U8 or S16. |
| * |
| * @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(transform_nearest(get_current_coords(), r), input_width, input_height); |
| 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. |
| * |
| * @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(&in, tc, input_width, input_height), 0, (__global DATA_TYPE *)out.ptr); |
| } |
