vendor/khanamiryan/qrcode-detector-decoder/lib/common/GridSampler.php

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<?php
/*
* Copyright 2007 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\Common;

use Zxing\NotFoundException;

/**
 * Implementations of this class can, given locations of finder patterns for a QR code in an
 * image, sample the right points in the image to reconstruct the QR code, accounting for
 * perspective distortion. It is abstracted since it is relatively expensive and should be allowed
 * to take advantage of platform-specific optimized implementations, like Sun's Java Advanced
 * Imaging library, but which may not be available in other environments such as J2ME, and vice
 * versa.
 *
 * The implementation used can be controlled by calling {@link #setGridSampler(GridSampler)}
 * with an instance of a class which implements this interface.
 *
 * @author Sean Owen
 */
abstract class GridSampler {

    private static $gridSampler;

    /**
     * Sets the implementation of GridSampler used by the library. One global
     * instance is stored, which may sound problematic. But, the implementation provided
     * ought to be appropriate for the entire platform, and all uses of this library
     * in the whole lifetime of the JVM. For instance, an Android activity can swap in
     * an implementation that takes advantage of native platform libraries.
     *
     * @param newGridSampler The platform-specific object to install.
     */
    public static function setGridSampler($newGridSampler) {
        self::$gridSampler = $newGridSampler;
    }

    /**
     * @return the current implementation of GridSampler
     */
    public static function getInstance() {
        if(!self::$gridSampler){
            self::$gridSampler = new DefaultGridSampler();
        }
        return self::$gridSampler;
    }