vendor/khanamiryan/qrcode-detector-decoder/lib/LuminanceSource.php

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<?php
/*
* Copyright 2009 ZXing 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.
*/

namespace Zxing;

/**
 * The purpose of this class hierarchy is to abstract different bitmap implementations across
 * platforms into a standard interface for requesting greyscale luminance values. The interface
 * only provides immutable methods; therefore crop and rotation create copies. This is to ensure
 * that one Reader does not modify the original luminance source and leave it in an unknown state
 * for other Readers in the chain.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
abstract class LuminanceSource {

    private  $width;
    private  $height;

     function __construct($width, $height) {
        $this->width = $width;
        $this->height = $height;
    }

    /**
     * Fetches one row of luminance data from the underlying platform's bitmap. Values range from
     * 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
     * to bitwise and with 0xff for each value. It is preferable for implementations of this method
     * to only fetch this row rather than the whole image, since no 2D Readers may be installed and
     * getMatrix() may never be called.
     *
     * @param $y; The row to fetch, which must be in [0,getHeight())
     * @param $row; An optional preallocated array. If null or too small, it will be ignored.
     *            Always use the returned object, and ignore the .length of the array.
     * @return array
     * An array containing the luminance data.
     */
    public abstract function getRow($y, $row);

    /**
     * Fetches luminance data for the underlying bitmap. Values should be fetched using:
     * {@code int luminance = array[y * width + x] & 0xff}
     *
     * @return A row-major 2D array of luminance values. Do not use result.length as it may be
     *         larger than width * height bytes on some platforms. Do not modify the contents
     *         of the result.