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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable max-depth */
'use strict';
// MAIN //
/**
* Applies a mask to a provided input ndarray and assigns unmasked values to elements in a provided one-dimensional output ndarray.
*
* @private
* @param {Object} x - object containing input ndarray meta data
* @param {Object} mask - object containing mask ndarray meta data
* @param {Object} y - object containing output ndarray meta data
* @returns {void}
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var Uint8Array = require( '@stdlib/array/uint8' );
*
* // Define the shape of the array:
* var shape = [ 1, 1, 3, 1, 2 ];
*
* // Define the array strides:
* var sx = [ 6, 6, 2, 2, 1 ];
* var sm = [ 6, 6, 2, 2, 1 ];
* var sy = [ 1 ];
*
* // Define the index offset:
* var ox = 1;
* var om = 0;
*
* var x = {
* 'dtype': 'float64',
* 'data': new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 ] ),
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major'
* };
*
* var mask = {
* 'dtype': 'uint8',
* 'data': new Uint8Array( [ 1, 0, 1, 0, 1, 0 ] ),
* 'shape': shape,
* 'strides': sm,
* 'offset': om,
* 'order': 'row-major'
* };
*
* var y = {
* 'dtype': 'float64',
* 'data': new Float64Array( 3 ),
* 'shape': [ 3 ],
* 'strides': sy,
* 'offset': 0,
* 'order': 'row-major'
* };
*
* mskfilter5d( x, mask, y );
*
* console.log( y.data );
* // => <Float64Array>[ 2.0, 4.0, 6.0 ]
*/
function mskfilter5d( x, mask, y ) {
var xbuf;
var mbuf;
var ybuf;
var dx0;
var dx1;
var dx2;
var dx3;
var dx4;
var dm0;
var dm1;
var dm2;
var dm3;
var dm4;
var dy0;
var S0;
var S1;
var S2;
var S3;
var S4;
var sh;
var sm;
var sx;
var ix;
var im;
var iy;
var i0;
var i1;
var i2;
var i3;
var i4;
// Extract loop variables: dimensions and loop offset (pointer) increments...
sh = x.shape;
sx = x.strides;
sm = mask.strides;
if ( x.order === 'row-major' ) {
// For row-major ndarrays, the last dimensions have the fastest changing indices...
S0 = sh[ 4 ];
S1 = sh[ 3 ];
S2 = sh[ 2 ];
S3 = sh[ 1 ];
S4 = sh[ 0 ];
dx0 = sx[ 4 ]; // offset increment for innermost loop
dx1 = sx[ 3 ] - ( S0*sx[4] );
dx2 = sx[ 2 ] - ( S1*sx[3] );
dx3 = sx[ 1 ] - ( S2*sx[2] );
dx4 = sx[ 0 ] - ( S3*sx[1] ); // offset increment for outermost loop
dm0 = sm[ 4 ];
dm1 = sm[ 3 ] - ( S0*sm[4] );
dm2 = sm[ 2 ] - ( S1*sm[3] );
dm3 = sm[ 1 ] - ( S2*sm[2] );
dm4 = sm[ 0 ] - ( S3*sm[1] );
} else { // order === 'column-major'
// For column-major ndarrays, the first dimensions have the fastest changing indices...
S0 = sh[ 0 ];
S1 = sh[ 1 ];
S2 = sh[ 2 ];
S3 = sh[ 3 ];
S4 = sh[ 4 ];
dx0 = sx[ 0 ]; // offset increment for innermost loop
dx1 = sx[ 1 ] - ( S0*sx[0] );
dx2 = sx[ 2 ] - ( S1*sx[1] );
dx3 = sx[ 3 ] - ( S2*sx[2] );
dx4 = sx[ 4 ] - ( S3*sx[3] ); // offset increment for outermost loop
dm0 = sm[ 0 ];
dm1 = sm[ 1 ] - ( S0*sm[0] );
dm2 = sm[ 2 ] - ( S1*sm[1] );
dm3 = sm[ 3 ] - ( S2*sm[2] );
dm4 = sm[ 4 ] - ( S3*sm[3] );
}
dy0 = y.strides[ 0 ];
// Set the pointers to the first indexed elements in the respective ndarrays...
ix = x.offset;
im = mask.offset;
iy = y.offset;
// Cache references to the input, mask, and output ndarray buffers...
xbuf = x.data;
mbuf = mask.data;
ybuf = y.data;
// Iterate over the ndarray dimensions...
for ( i4 = 0; i4 < S4; i4++ ) {
for ( i3 = 0; i3 < S3; i3++ ) {
for ( i2 = 0; i2 < S2; i2++ ) {
for ( i1 = 0; i1 < S1; i1++ ) {
for ( i0 = 0; i0 < S0; i0++ ) {
if ( mbuf[ im ] ) {
ybuf[ iy ] = xbuf[ ix ];
iy += dy0;
}
ix += dx0;
im += dm0;
}
ix += dx1;
im += dm1;
}
ix += dx2;
im += dm2;
}
ix += dx3;
im += dm3;
}
ix += dx4;
im += dm4;
}
}
// EXPORTS //
module.exports = mskfilter5d;
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