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/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* 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.
*/
extern "C" {
__global__ void Thumbnail_uchar(cudaTextureObject_t uchar_tex,
int *histogram, int src_width, int src_height)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (y < src_height && x < src_width)
{
unsigned char pixel = tex2D<unsigned char>(uchar_tex, x, y);
atomicAdd(&histogram[pixel], 1);
}
}
__global__ void Thumbnail_uchar2(cudaTextureObject_t uchar2_tex,
int *histogram, int src_width, int src_height)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (y < src_height && x < src_width)
{
uchar2 pixel = tex2D<uchar2>(uchar2_tex, x, y);
atomicAdd(&histogram[pixel.x], 1);
atomicAdd(&histogram[256 + pixel.y], 1);
}
}
__global__ void Thumbnail_ushort(cudaTextureObject_t ushort_tex,
int *histogram, int src_width, int src_height)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (y < src_height && x < src_width)
{
unsigned short pixel = (tex2D<unsigned short>(ushort_tex, x, y) + 128) >> 8;
atomicAdd(&histogram[pixel], 1);
}
}
__global__ void Thumbnail_ushort2(cudaTextureObject_t ushort2_tex,
int *histogram, int src_width, int src_height)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (y < src_height && x < src_width)
{
ushort2 pixel = tex2D<ushort2>(ushort2_tex, x, y);
atomicAdd(&histogram[(pixel.x + 128) >> 8], 1);
atomicAdd(&histogram[256 + ((pixel.y + 128) >> 8)], 1);
}
}
}
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