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/*
* This file is part of FFmpeg.
*
* 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 "cuda/vector_helpers.cuh"
#include "vf_scale_cuda.h"
typedef float4 (*coeffs_function_t)(float, float);
__device__ inline float4 lanczos_coeffs(float x, float param)
{
const float pi = 3.141592654f;
float4 res = make_float4(
pi * (x + 1),
pi * x,
pi * (x - 1),
pi * (x - 2));
res.x = res.x == 0.0f ? 1.0f :
__sinf(res.x) * __sinf(res.x / 2.0f) / (res.x * res.x / 2.0f);
res.y = res.y == 0.0f ? 1.0f :
__sinf(res.y) * __sinf(res.y / 2.0f) / (res.y * res.y / 2.0f);
res.z = res.z == 0.0f ? 1.0f :
__sinf(res.z) * __sinf(res.z / 2.0f) / (res.z * res.z / 2.0f);
res.w = res.w == 0.0f ? 1.0f :
__sinf(res.w) * __sinf(res.w / 2.0f) / (res.w * res.w / 2.0f);
return res / (res.x + res.y + res.z + res.w);
}
__device__ inline float4 bicubic_coeffs(float x, float param)
{
const float A = param == SCALE_CUDA_PARAM_DEFAULT ? 0.0f : -param;
float4 res;
res.x = ((A * (x + 1) - 5 * A) * (x + 1) + 8 * A) * (x + 1) - 4 * A;
res.y = ((A + 2) * x - (A + 3)) * x * x + 1;
res.z = ((A + 2) * (1 - x) - (A + 3)) * (1 - x) * (1 - x) + 1;
res.w = 1.0f - res.x - res.y - res.z;
return res;
}
__device__ inline void derived_fast_coeffs(float4 coeffs, float x, float *h0, float *h1, float *s)
{
float g0 = coeffs.x + coeffs.y;
float g1 = coeffs.z + coeffs.w;
*h0 = coeffs.y / g0 - 0.5f;
*h1 = coeffs.w / g1 + 1.5f;
*s = g0 / (g0 + g1);
}
template<typename V>
__device__ inline V apply_coeffs(float4 coeffs, V c0, V c1, V c2, V c3)
{
V res = c0 * coeffs.x;
res += c1 * coeffs.y;
res += c2 * coeffs.z;
res += c3 * coeffs.w;
return res;
}
template<typename T>
__device__ inline void Subsample_Bicubic(coeffs_function_t coeffs_function,
cudaTextureObject_t src_tex,
T *dst,
int dst_width, int dst_height, int dst_pitch,
int src_width, int src_height,
int bit_depth, float param)
{
int xo = blockIdx.x * blockDim.x + threadIdx.x;
int yo = blockIdx.y * blockDim.y + threadIdx.y;
if (yo < dst_height && xo < dst_width)
{
float hscale = (float)src_width / (float)dst_width;
float vscale = (float)src_height / (float)dst_height;
float xi = (xo + 0.5f) * hscale - 0.5f;
float yi = (yo + 0.5f) * vscale - 0.5f;
float px = floor(xi);
float py = floor(yi);
float fx = xi - px;
float fy = yi - py;
float factor = bit_depth > 8 ? 0xFFFF : 0xFF;
float4 coeffsX = coeffs_function(fx, param);
float4 coeffsY = coeffs_function(fy, param);
#define PIX(x, y) tex2D<floatT>(src_tex, (x), (y))
dst[yo * dst_pitch + xo] = from_floatN<T, floatT>(
apply_coeffs<floatT>(coeffsY,
apply_coeffs<floatT>(coeffsX, PIX(px - 1, py - 1), PIX(px, py - 1), PIX(px + 1, py - 1), PIX(px + 2, py - 1)),
apply_coeffs<floatT>(coeffsX, PIX(px - 1, py ), PIX(px, py ), PIX(px + 1, py ), PIX(px + 2, py )),
apply_coeffs<floatT>(coeffsX, PIX(px - 1, py + 1), PIX(px, py + 1), PIX(px + 1, py + 1), PIX(px + 2, py + 1)),
apply_coeffs<floatT>(coeffsX, PIX(px - 1, py + 2), PIX(px, py + 2), PIX(px + 1, py + 2), PIX(px + 2, py + 2))
) * factor
);
#undef PIX
}
}
/* This does not yield correct results. Most likely because of low internal precision in tex2D linear interpolation */
template<typename T>
__device__ inline void Subsample_FastBicubic(coeffs_function_t coeffs_function,
cudaTextureObject_t src_tex,
T *dst,
int dst_width, int dst_height, int dst_pitch,
int src_width, int src_height,
int bit_depth, float param)
{
int xo = blockIdx.x * blockDim.x + threadIdx.x;
int yo = blockIdx.y * blockDim.y + threadIdx.y;
if (yo < dst_height && xo < dst_width)
{
float hscale = (float)src_width / (float)dst_width;
float vscale = (float)src_height / (float)dst_height;
float xi = (xo + 0.5f) * hscale - 0.5f;
float yi = (yo + 0.5f) * vscale - 0.5f;
float px = floor(xi);
float py = floor(yi);
float fx = xi - px;
float fy = yi - py;
float factor = bit_depth > 8 ? 0xFFFF : 0xFF;
float4 coeffsX = coeffs_function(fx, param);
float4 coeffsY = coeffs_function(fy, param);
float h0x, h1x, sx;
float h0y, h1y, sy;
derived_fast_coeffs(coeffsX, fx, &h0x, &h1x, &sx);
derived_fast_coeffs(coeffsY, fy, &h0y, &h1y, &sy);
#define PIX(x, y) tex2D<floatT>(src_tex, (x), (y))
floatT pix[4] = {
PIX(px + h0x, py + h0y),
PIX(px + h1x, py + h0y),
PIX(px + h0x, py + h1y),
PIX(px + h1x, py + h1y)
};
#undef PIX
dst[yo * dst_pitch + xo] = from_floatN<T, floatT>(
lerp_scalar(
lerp_scalar(pix[3], pix[2], sx),
lerp_scalar(pix[1], pix[0], sx),
sy) * factor
);
}
}
extern "C" {
#define BICUBIC_KERNEL(T) \
__global__ void Subsample_Bicubic_ ## T(cudaTextureObject_t src_tex, \
T *dst, \
int dst_width, int dst_height, int dst_pitch, \
int src_width, int src_height, \
int bit_depth, float param) \
{ \
Subsample_Bicubic<T>(&bicubic_coeffs, src_tex, dst, \
dst_width, dst_height, dst_pitch, \
src_width, src_height, \
bit_depth, param); \
}
BICUBIC_KERNEL(uchar)
BICUBIC_KERNEL(uchar2)
BICUBIC_KERNEL(uchar4)
BICUBIC_KERNEL(ushort)
BICUBIC_KERNEL(ushort2)
BICUBIC_KERNEL(ushort4)
#define LANCZOS_KERNEL(T) \
__global__ void Subsample_Lanczos_ ## T(cudaTextureObject_t src_tex, \
T *dst, \
int dst_width, int dst_height, int dst_pitch, \
int src_width, int src_height, \
int bit_depth, float param) \
{ \
Subsample_Bicubic<T>(&lanczos_coeffs, src_tex, dst, \
dst_width, dst_height, dst_pitch, \
src_width, src_height, \
bit_depth, param); \
}
LANCZOS_KERNEL(uchar)
LANCZOS_KERNEL(uchar2)
LANCZOS_KERNEL(uchar4)
LANCZOS_KERNEL(ushort)
LANCZOS_KERNEL(ushort2)
LANCZOS_KERNEL(ushort4)
}
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