warp_perspective.cl
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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2010-2012, Institute Of Software Chinese Academy Of Science, all rights reserved.
// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// @Authors
// Zhang Ying, zhangying913@gmail.com
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors as is and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#ifdef DOUBLE_SUPPORT
#ifdef cl_amd_fp64
#pragma OPENCL EXTENSION cl_amd_fp64:enable
#elif defined (cl_khr_fp64)
#pragma OPENCL EXTENSION cl_khr_fp64:enable
#endif
#endif
#define INTER_BITS 5
#define INTER_TAB_SIZE (1 << INTER_BITS)
#define INTER_SCALE 1.f / INTER_TAB_SIZE
#define AB_BITS max(10, (int)INTER_BITS)
#define AB_SCALE (1 << AB_BITS)
#define INTER_REMAP_COEF_BITS 15
#define INTER_REMAP_COEF_SCALE (1 << INTER_REMAP_COEF_BITS)
#define noconvert
#ifndef ST
#define ST T
#endif
#if cn != 3
#define loadpix(addr) *(__global const T*)(addr)
#define storepix(val, addr) *(__global T*)(addr) = val
#define scalar scalar_
#define pixsize (int)sizeof(T)
#else
#define loadpix(addr) vload3(0, (__global const T1*)(addr))
#define storepix(val, addr) vstore3(val, 0, (__global T1*)(addr))
#ifdef INTER_NEAREST
#define scalar (T)(scalar_.x, scalar_.y, scalar_.z)
#else
#define scalar (WT)(scalar_.x, scalar_.y, scalar_.z)
#endif
#define pixsize ((int)sizeof(T1)*3)
#endif
#ifdef INTER_NEAREST
__kernel void warpPerspective(__global const uchar * srcptr, int src_step, int src_offset, int src_rows, int src_cols,
__global uchar * dstptr, int dst_step, int dst_offset, int dst_rows, int dst_cols,
__constant CT * M, ST scalar_)
{
int dx = get_global_id(0);
int dy = get_global_id(1);
if (dx < dst_cols && dy < dst_rows)
{
CT X0 = M[0] * dx + M[1] * dy + M[2];
CT Y0 = M[3] * dx + M[4] * dy + M[5];
CT W = M[6] * dx + M[7] * dy + M[8];
W = W != 0.0f ? 1.f / W : 0.0f;
short sx = convert_short_sat_rte(X0*W);
short sy = convert_short_sat_rte(Y0*W);
int dst_index = mad24(dy, dst_step, dx * pixsize + dst_offset);
if (sx >= 0 && sx < src_cols && sy >= 0 && sy < src_rows)
{
int src_index = mad24(sy, src_step, sx * pixsize + src_offset);
storepix(loadpix(srcptr + src_index), dstptr + dst_index);
}
else
storepix(scalar, dstptr + dst_index);
}
}
#elif defined INTER_LINEAR
__kernel void warpPerspective(__global const uchar * srcptr, int src_step, int src_offset, int src_rows, int src_cols,
__global uchar * dstptr, int dst_step, int dst_offset, int dst_rows, int dst_cols,
__constant CT * M, ST scalar_)
{
int dx = get_global_id(0);
int dy = get_global_id(1);
if (dx < dst_cols && dy < dst_rows)
{
CT X0 = M[0] * dx + M[1] * dy + M[2];
CT Y0 = M[3] * dx + M[4] * dy + M[5];
CT W = M[6] * dx + M[7] * dy + M[8];
W = W != 0.0f ? INTER_TAB_SIZE / W : 0.0f;
int X = rint(X0 * W), Y = rint(Y0 * W);
short sx = convert_short_sat(X >> INTER_BITS);
short sy = convert_short_sat(Y >> INTER_BITS);
short ay = (short)(Y & (INTER_TAB_SIZE - 1));
short ax = (short)(X & (INTER_TAB_SIZE - 1));
WT v0 = (sx >= 0 && sx < src_cols && sy >= 0 && sy < src_rows) ?
convertToWT(loadpix(srcptr + mad24(sy, src_step, src_offset + sx * pixsize))) : scalar;
WT v1 = (sx+1 >= 0 && sx+1 < src_cols && sy >= 0 && sy < src_rows) ?
convertToWT(loadpix(srcptr + mad24(sy, src_step, src_offset + (sx+1) * pixsize))) : scalar;
WT v2 = (sx >= 0 && sx < src_cols && sy+1 >= 0 && sy+1 < src_rows) ?
convertToWT(loadpix(srcptr + mad24(sy+1, src_step, src_offset + sx * pixsize))) : scalar;
WT v3 = (sx+1 >= 0 && sx+1 < src_cols && sy+1 >= 0 && sy+1 < src_rows) ?
convertToWT(loadpix(srcptr + mad24(sy+1, src_step, src_offset + (sx+1) * pixsize))) : scalar;
float taby = 1.f/INTER_TAB_SIZE*ay;
float tabx = 1.f/INTER_TAB_SIZE*ax;
int dst_index = mad24(dy, dst_step, dst_offset + dx * pixsize);
#if depth <= 4
int itab0 = convert_short_sat_rte( (1.0f-taby)*(1.0f-tabx) * INTER_REMAP_COEF_SCALE );
int itab1 = convert_short_sat_rte( (1.0f-taby)*tabx * INTER_REMAP_COEF_SCALE );
int itab2 = convert_short_sat_rte( taby*(1.0f-tabx) * INTER_REMAP_COEF_SCALE );
int itab3 = convert_short_sat_rte( taby*tabx * INTER_REMAP_COEF_SCALE );
WT val = v0 * itab0 + v1 * itab1 + v2 * itab2 + v3 * itab3;
storepix(convertToT((val + (1 << (INTER_REMAP_COEF_BITS-1))) >> INTER_REMAP_COEF_BITS), dstptr + dst_index);
#else
float tabx2 = 1.0f - tabx, taby2 = 1.0f - taby;
WT val = v0 * tabx2 * taby2 + v1 * tabx * taby2 + v2 * tabx2 * taby + v3 * tabx * taby;
storepix(convertToT(val), dstptr + dst_index);
#endif
}
}
#elif defined INTER_CUBIC
inline void interpolateCubic( float x, float* coeffs )
{
const float A = -0.75f;
coeffs[0] = ((A*(x + 1.f) - 5.0f*A)*(x + 1.f) + 8.0f*A)*(x + 1.f) - 4.0f*A;
coeffs[1] = ((A + 2.f)*x - (A + 3.f))*x*x + 1.f;
coeffs[2] = ((A + 2.f)*(1.f - x) - (A + 3.f))*(1.f - x)*(1.f - x) + 1.f;
coeffs[3] = 1.f - coeffs[0] - coeffs[1] - coeffs[2];
}
__kernel void warpPerspective(__global const uchar * srcptr, int src_step, int src_offset, int src_rows, int src_cols,
__global uchar * dstptr, int dst_step, int dst_offset, int dst_rows, int dst_cols,
__constant CT * M, ST scalar_)
{
int dx = get_global_id(0);
int dy = get_global_id(1);
if (dx < dst_cols && dy < dst_rows)
{
CT X0 = M[0] * dx + M[1] * dy + M[2];
CT Y0 = M[3] * dx + M[4] * dy + M[5];
CT W = M[6] * dx + M[7] * dy + M[8];
W = W != 0.0f ? INTER_TAB_SIZE / W : 0.0f;
int X = rint(X0 * W), Y = rint(Y0 * W);
short sx = convert_short_sat(X >> INTER_BITS) - 1;
short sy = convert_short_sat(Y >> INTER_BITS) - 1;
short ay = (short)(Y & (INTER_TAB_SIZE-1));
short ax = (short)(X & (INTER_TAB_SIZE-1));
WT v[16];
#pragma unroll
for (int y = 0; y < 4; y++)
#pragma unroll
for (int x = 0; x < 4; x++)
v[mad24(y, 4, x)] = (sx+x >= 0 && sx+x < src_cols && sy+y >= 0 && sy+y < src_rows) ?
convertToWT(loadpix(srcptr + mad24(sy+y, src_step, src_offset + (sx+x) * pixsize))) : scalar;
float tab1y[4], tab1x[4];
float ayy = INTER_SCALE * ay;
float axx = INTER_SCALE * ax;
interpolateCubic(ayy, tab1y);
interpolateCubic(axx, tab1x);
int dst_index = mad24(dy, dst_step, dst_offset + dx * pixsize);
WT sum = (WT)(0);
#if depth <= 4
int itab[16];
#pragma unroll
for (int i = 0; i < 16; i++)
itab[i] = rint(tab1y[(i>>2)] * tab1x[(i&3)] * INTER_REMAP_COEF_SCALE);
#pragma unroll
for (int i = 0; i < 16; i++)
sum += v[i] * itab[i];
storepix(convertToT( (sum + (1 << (INTER_REMAP_COEF_BITS-1))) >> INTER_REMAP_COEF_BITS ), dstptr + dst_index);
#else
#pragma unroll
for (int i = 0; i < 16; i++)
sum += v[i] * tab1y[(i>>2)] * tab1x[(i&3)];
storepix(convertToT( sum ), dstptr + dst_index);
#endif
}
}
#endif