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transform.cpp
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/*******************************************************
* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <af/image.h>
#include <af/defines.h>
#include <err_common.hpp>
#include <handle.hpp>
#include <ArrayInfo.hpp>
#include <backend.hpp>
#include <transform.hpp>
using af::dim4;
using namespace detail;
template<typename T>
static inline af_array transform(const af_array in, const af_array tf, const af::dim4 &odims,
const af_interp_type method, const bool inverse)
{
return getHandle(transform<T>(getArray<T>(in), getArray<float>(tf), odims, method, inverse));
}
af_err af_transform(af_array *out, const af_array in, const af_array tf,
const dim_type odim0, const dim_type odim1,
const af_interp_type method, const bool inverse)
{
try {
ArrayInfo t_info = getInfo(tf);
ArrayInfo i_info = getInfo(in);
af::dim4 idims = i_info.dims();
af::dim4 tdims = t_info.dims();
af_dtype itype = i_info.getType();
ARG_ASSERT(2, t_info.getType() == f32);
ARG_ASSERT(5, method == AF_INTERP_NEAREST || method == AF_INTERP_BILINEAR);
DIM_ASSERT(2, (tdims[0] == 3 && tdims[1] == 2));
DIM_ASSERT(1, idims.elements() > 0);
DIM_ASSERT(1, (idims.ndims() == 2 || idims.ndims() == 3));
dim_type o0 = odim0, o1 = odim1;
dim_type o2 = idims[2] * tdims[2];
if (odim0 * odim1 == 0) {
o0 = idims[0];
o1 = idims[1];
}
af::dim4 odims(o0, o1, o2, 1);
af_array output = 0;
switch(itype) {
case f32: output = transform<float >(in, tf, odims, method, inverse); break;
case f64: output = transform<double >(in, tf, odims, method, inverse); break;
case s32: output = transform<int >(in, tf, odims, method, inverse); break;
case u32: output = transform<uint >(in, tf, odims, method, inverse); break;
case u8: output = transform<uchar >(in, tf, odims, method, inverse); break;
default: TYPE_ERROR(1, itype);
}
std::swap(*out,output);
}
CATCHALL;
return AF_SUCCESS;
}
af_err af_translate(af_array *out, const af_array in, const float trans0, const float trans1,
const dim_type odim0, const dim_type odim1, const af_interp_type method)
{
try {
static float trans_mat[6] = {1, 0, 0,
0, 1, 0};
trans_mat[2] = trans0;
trans_mat[5] = trans1;
static af::dim4 tdims(3, 2, 1, 1);
af_array t = 0;
AF_CHECK(af_create_array(&t, trans_mat, tdims.ndims(), tdims.get(), f32));
AF_CHECK(af_transform(out, in, t, odim0, odim1, method, true));
AF_CHECK(af_destroy_array(t));
}
CATCHALL;
return AF_SUCCESS;
}
af_err af_scale(af_array *out, const af_array in, const float scale0, const float scale1,
const dim_type odim0, const dim_type odim1, const af_interp_type method)
{
try {
ArrayInfo i_info = getInfo(in);
af::dim4 idims = i_info.dims();
dim_type _odim0 = odim0, _odim1 = odim1;
float sx, sy;
DIM_ASSERT(4, odim0 != 0);
DIM_ASSERT(5, odim1 != 0);
if(_odim0 == 0 && _odim1 == 0) {
sx = 1.f / scale0, sy = 1.f / scale1;
_odim0 = idims[0] / sx;
_odim1 = idims[1] / sy;
} else if (scale0 == 0 && scale1 == 0) {
sx = idims[0] / (float)_odim0;
sy = idims[1] / (float)_odim1;
} else {
sx = 1.f / scale0, sy = 1.f / scale1;
}
static float trans_mat[6] = {1, 0, 0,
0, 1, 0};
trans_mat[0] = sx;
trans_mat[4] = sy;
static af::dim4 tdims(3, 2, 1, 1);
af_array t = 0;
AF_CHECK(af_create_array(&t, trans_mat, tdims.ndims(), tdims.get(), f32));
AF_CHECK(af_transform(out, in, t, _odim0, _odim1, method, true));
AF_CHECK(af_destroy_array(t));
}
CATCHALL;
return AF_SUCCESS;
}
af_err af_skew(af_array *out, const af_array in, const float skew0, const float skew1,
const dim_type odim0, const dim_type odim1, const af_interp_type method,
const bool inverse)
{
try {
float tx = std::tan(skew0);
float ty = std::tan(skew1);
static float trans_mat[6] = {1, 0, 0,
0, 1, 0};
trans_mat[1] = ty;
trans_mat[3] = tx;
if(inverse) {
if(tx == 0 || ty == 0) {
trans_mat[1] = tx;
trans_mat[3] = ty;
} else {
//calc_tranform_inverse(trans_mat);
//short cut of calc_transform_inverse
float d = 1.0f / (1.0f - tx * ty);
trans_mat[0] = d;
trans_mat[1] = ty * d;
trans_mat[3] = tx * d;
trans_mat[4] = d;
}
}
static af::dim4 tdims(3, 2, 1, 1);
af_array t = 0;
AF_CHECK(af_create_array(&t, trans_mat, tdims.ndims(), tdims.get(), f32));
AF_CHECK(af_transform(out, in, t, odim0, odim1, method, true));
AF_CHECK(af_destroy_array(t));
}
CATCHALL;
return AF_SUCCESS;
}