File ext-tool-image/src/MvcCore/Ext/Tools/Images/Gds/ApplyMask.php

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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Tools\Images\Gds;

class ApplyMask {

    /**
     * @param resource $image 
     * @param resource $mask 
     * @return void
     */
    public static function Process ($image, $mask) {

        // Get sizes and set up new picture
        $xSize = imagesx($image);
        $ySize = imagesy($image);

        $newPicture = imagecreatetruecolor($xSize, $ySize);
        imagesavealpha($newPicture, TRUE);
        imagefill(
            $newPicture, 0, 0,
            imagecolorallocatealpha($newPicture, 0, 0, 0, 127)
        );

        // Resize mask if necessary
        if ($xSize != imagesx($mask) || $ySize != imagesy($mask)) {
            $tempPic = imagecreatetruecolor($xSize, $ySize);
            imagecopyresampled(
                $tempPic, $mask, 0, 0, 0, 0,
                $xSize, $ySize, imagesx($mask), imagesy($mask)
            );
            imagedestroy($mask);
            $mask = $tempPic;
        }

        // Perform pixel-based alpha map application
        for ($x = 0; $x < $xSize; $x++) {
            for($y = 0; $y < $ySize; $y++) {
                $rgba = imagecolorsforindex(
                    $mask, imagecolorat($mask, $x, $y)
                );
                $whiteRatio = (
                    $rgba['red'] + $rgba['green'] + $rgba['blue']
                ) / 765;
                $alpha = 127 - round(127 * $whiteRatio);
                $color = imagecolorsforindex(
                    $image, imagecolorat($image, $x, $y)
                );
                imagesetpixel(
                    $newPicture,
                    $x, $y,
                    imagecolorallocatealpha(
                        $newPicture,
                        $color['red'],
                        $color['green'],
                        $color['blue'],
                        $alpha
                    )
                );
            }
        }

        // Copy back to original picture
        imagedestroy($image);
        $image = $newPicture;
    }
}

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