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Editing: bmp-to-image-object.php

<?php

/**
 * Converts BMP to JPG
 *
 * @link https://github.com/dompdf/dompdf/blob/master/src/Helpers.php
 * @link http://www.programmierer-forum.de/function-imagecreatefrombmp-welche-variante-laeuft-t143137.htm
 * @since 4.3.0
 */
function bmp_to_image_object( $filename, $context = null ) {
    $filename = wp_kses_post( $filename );

if (!function_exists("imagecreatetruecolor")) {
        trigger_error("The PHP GD extension is required, but is not installed.", E_ERROR);
        return false;
    }

// version 1.00
    if (!($fh = fopen($filename, 'rb'))) {
        // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
        trigger_error('imagecreatefrombmp: Can not open ' . $filename, E_USER_WARNING);
        return false;
    }

$bytes_read = 0;

// read file header
    $meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));

// check for bitmap
    if ($meta['type'] != 19778) {
        // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
        trigger_error('imagecreatefrombmp: ' . $filename . ' is not a bitmap!', E_USER_WARNING);
        return false;
    }

// read image header
    $meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40));
    $bytes_read += 40;

// read additional bitfield header
    if ($meta['compression'] == 3) {
        $meta += unpack('VrMask/VgMask/VbMask', fread($fh, 12));
        $bytes_read += 12;
    }

// set bytes and padding
    $meta['bytes'] = $meta['bits'] / 8;
    $meta['decal'] = 4 - (4 * (($meta['width'] * $meta['bytes'] / 4) - floor($meta['width'] * $meta['bytes'] / 4)));
    if ($meta['decal'] == 4) {
        $meta['decal'] = 0;
    }

// obtain imagesize
    if ($meta['imagesize'] < 1) {
        $meta['imagesize'] = $meta['filesize'] - $meta['offset'];
        // in rare cases filesize is equal to offset so we need to read physical size
        if ($meta['imagesize'] < 1) {
            $meta['imagesize'] = @filesize($filename) - $meta['offset'];
            if ($meta['imagesize'] < 1) {
                // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
                trigger_error('imagecreatefrombmp: Can not obtain filesize of ' . $filename . '!', E_USER_WARNING);
                return false;
            }
        }
    }

// calculate colors
    $meta['colors'] = !$meta['colors'] ? pow(2, $meta['bits']) : $meta['colors'];

// read color palette
    $palette = [];
    if ($meta['bits'] < 16) {
        $palette = unpack('l' . $meta['colors'], fread($fh, $meta['colors'] * 4));
        // in rare cases the color value is signed
        if ($palette[1] < 0) {
            foreach ($palette as $i => $color) {
                $palette[$i] = $color + 16777216;
            }
        }
    }

// ignore extra bitmap headers
    if ($meta['headersize'] > $bytes_read) {
        fread($fh, $meta['headersize'] - $bytes_read);
    }

// create gd image
    $im = imagecreatetruecolor($meta['width'], $meta['height']);
    $data = fread($fh, $meta['imagesize']);

// uncompress data
    switch ($meta['compression']) {
        case 1:
            $data = Helpers::rle8_decode($data, $meta['width']);
            break;
        case 2:
            $data = Helpers::rle4_decode($data, $meta['width']);
            break;
    }

$p = 0;
    $vide = chr(0);
    $y = $meta['height'] - 1;
    $error = 'imagecreatefrombmp: ' . $filename . ' has not enough data!';

// loop through the image data beginning with the lower left corner
    while ($y >= 0) {
        $x = 0;
        while ($x < $meta['width']) {
            switch ($meta['bits']) {
                case 32:
                case 24:
                    if (!($part = substr($data, $p, 3 /*$meta['bytes']*/))) {
                        // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
                        trigger_error($error, E_USER_WARNING);
                        return $im;
                    }
                    $color = unpack('V', $part . $vide);
                    break;
                case 16:
                    if (!($part = substr($data, $p, 2 /*$meta['bytes']*/))) {
                        // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
                        trigger_error($error, E_USER_WARNING);
                        return $im;
                    }
                    $color = unpack('v', $part);

if (empty($meta['rMask']) || $meta['rMask'] != 0xf800) {
                        $color[1] = (($color[1] & 0x7c00) >> 7) * 65536 + (($color[1] & 0x03e0) >> 2) * 256 + (($color[1] & 0x001f) << 3); // 555
                    } else {
                        $color[1] = (($color[1] & 0xf800) >> 8) * 65536 + (($color[1] & 0x07e0) >> 3) * 256 + (($color[1] & 0x001f) << 3); // 565
                    }
                    break;
                case 8:
                    $color = unpack('n', $vide . substr($data, $p, 1));
                    $color[1] = $palette[$color[1] + 1];
                    break;
                case 4:
                    $color = unpack('n', $vide . substr($data, floor($p), 1));
                    $color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F;
                    $color[1] = $palette[$color[1] + 1];
                    break;
                case 1:
                    $color = unpack('n', $vide . substr($data, floor($p), 1));
                    switch (($p * 8) % 8) {
                        case 0:
                            $color[1] = $color[1] >> 7;
                            break;
                        case 1:
                            $color[1] = ($color[1] & 0x40) >> 6;
                            break;
                        case 2:
                            $color[1] = ($color[1] & 0x20) >> 5;
                            break;
                        case 3:
                            $color[1] = ($color[1] & 0x10) >> 4;
                            break;
                        case 4:
                            $color[1] = ($color[1] & 0x8) >> 3;
                            break;
                        case 5:
                            $color[1] = ($color[1] & 0x4) >> 2;
                            break;
                        case 6:
                            $color[1] = ($color[1] & 0x2) >> 1;
                            break;
                        case 7:
                            $color[1] = ($color[1] & 0x1);
                            break;
                    }
                    $color[1] = $palette[$color[1] + 1];
                    break;
                default:
                    // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
                    trigger_error('imagecreatefrombmp: ' . $filename . ' has ' . $meta['bits'] . ' bits and this is not supported!', E_USER_WARNING);
                    return false;
            }
            imagesetpixel($im, $x, $y, $color[1]);
            $x++;
            $p += $meta['bytes'];
        }
        $y--;
        $p += $meta['decal'];
    }
    fclose($fh);
    return $im;

}

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Editing: bmp-to-image-object.php

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