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* @license Apache-2.0
*
* Copyright (c) 2026 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.
*/
'use strict';
// MAIN //
/**
* Resolves the number of output rows and the starting row offset for a convolution matrix.
*
* @private
* @param {string} mode - convolution mode
* @param {NonNegativeInteger} m - number of indexed elements in `x`
* @param {NonNegativeInteger} N - number of columns in the output matrix
* @param {Array} out - output array for storing the result
* @returns {Array} output array where `out[0]` is the number of rows and `out[1]` is the starting row offset
*
* @example
* var out = [ 0, 0 ];
* resolveMode( 'full', 3, 3, out );
* // out => [ 5, 0 ]
*
* @example
* var out = [ 0, 0 ];
* resolveMode( 'same', 3, 3, out );
* // out => [ 3, 1 ]
*
* @example
* var out = [ 0, 0 ];
* resolveMode( 'valid', 3, 5, out );
* // out => [ 3, 2 ]
*/
function resolveMode( mode, m, N, out ) {
var d;
if ( mode === 'full' ) {
out[ 0 ] = m + N - 1;
out[ 1 ] = 0;
} else if ( mode === 'same' ) {
out[ 0 ] = ( m >= N ) ? m : N;
d = ( m < N ) ? m : N;
out[ 1 ] = ( ( d - 1 ) / 2 ) | 0;
} else { // mode === 'valid'
d = m - N;
out[ 0 ] = ( ( d < 0 ) ? -d : d ) + 1;
d = ( m < N ) ? m : N;
out[ 1 ] = d - 1;
}
return out;
}
// EXPORTS //
module.exports = resolveMode;
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