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<?php
/* DON'T copy the first line (above) if your functions.php already has it. 
 * ---------------------------------------------------------------------- */
 
 function my_et_theme_setup() {
	if ( class_exists( 'ET_Builder_Module_Gallery' ) ) {
		get_template_part( 'my-main-modules' );
		$et_pb_gallery = new My_ET_Builder_Module_Gallery();
		remove_shortcode('et_pb_gallery');
		add_shortcode('et_pb_gallery', array( $et_pb_gallery, '_shortcode_callback' ) );
	}
}
add_action( 'wp', 'my_et_theme_setup', 99 );

<?php
class My_ET_Builder_Module_Gallery extends ET_Builder_Module_Gallery {
	
	function shortcode_callback( $atts, $content = null, $function_name ) {
		$module_id              = $this->shortcode_atts['module_id'];
		$module_class           = $this->shortcode_atts['module_class'];
		$gallery_ids            = $this->shortcode_atts['gallery_ids'];
		$fullwidth              = $this->shortcode_atts['fullwidth'];
		$show_title_and_caption = $this->shortcode_atts['show_title_and_caption'];
		$background_layout      = $this->shortcode_atts['background_layout'];
		$posts_number           = $this->shortcode_atts['posts_number'];
		$show_pagination        = $this->shortcode_atts['show_pagination'];
		$gallery_orderby        = $this->shortcode_atts['gallery_orderby'];
		$zoom_icon_color        = $this->shortcode_atts['zoom_icon_color'];
		$hover_overlay_color    = $this->shortcode_atts['hover_overlay_color'];
		$hover_icon             = $this->shortcode_atts['hover_icon'];
		$auto                   = $this->shortcode_atts['auto'];
		$auto_speed             = $this->shortcode_atts['auto_speed'];
		$module_class = ET_Builder_Element::add_module_order_class( $module_class, $function_name );
		if ( '' !== $zoom_icon_color ) {
			ET_Builder_Element::set_style( $function_name, array(
				'selector'    => '%%order_class%% .et_overlay:before',
				'declaration' => sprintf(
					'color: %1$s !important;',
					esc_html( $zoom_icon_color )
				),
			) );
		}
		if ( '' !== $hover_overlay_color ) {
			ET_Builder_Element::set_style( $function_name, array(
				'selector'    => '%%order_class%% .et_overlay',
				'declaration' => sprintf(
					'background-color: %1$s;
					border-color: %1$s;',
					esc_html( $hover_overlay_color )
				),
			) );
		}
		$attachments = array();
		if ( ! empty( $gallery_ids ) ) {
			$attachments_args = array(
				'include'        => $gallery_ids,
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => 'ASC',
				'orderby'        => 'post__in',
			);
			if ( 'rand' === $gallery_orderby ) {
				$attachments_args['orderby'] = 'rand';
			}
			$_attachments = get_posts( $attachments_args );
			foreach ( $_attachments as $key => $val ) {
				$attachments[$val->ID] = $_attachments[$key];
			}
		}
		if ( empty($attachments) )
			return '';
		wp_enqueue_script( 'hashchange' );
		$fullwidth_class = 'on' === $fullwidth ?  ' et_pb_slider et_pb_gallery_fullwidth' : ' et_pb_gallery_grid';
		$background_class = " et_pb_bg_layout_{$background_layout}";
		$module_class .= 'on' === $auto && 'on' === $fullwidth ? ' et_slider_auto et_slider_speed_' . esc_attr( $auto_speed ) : '';
		$output = sprintf(
			'<div%1$s class="et_pb_module et_pb_gallery%2$s%3$s%4$s clearfix">
				<div class="et_pb_gallery_items et_post_gallery" data-per_page="%5$d">',
			( '' !== $module_id ? sprintf( ' id="%1$s"', esc_attr( $module_id ) ) : '' ),
			( '' !== $module_class ? sprintf( ' %1$s', esc_attr( ltrim( $module_class ) ) ) : '' ),
			esc_attr( $fullwidth_class ),
			esc_attr( $background_class ),
			esc_attr( $posts_number )
		);
		$i = 0;
		foreach ( $attachments as $id => $attachment ) {
			$width = 'on' === $fullwidth ?  1080 : 400;
			$width = (int) apply_filters( 'et_pb_gallery_image_width', $width );
			$height = 'on' === $fullwidth ?  9999 : 284;
			$height = (int) apply_filters( 'et_pb_gallery_image_height', $height );
			list($full_src, $full_width, $full_height) = wp_get_attachment_image_src( $id, 'full' );
			list($thumb_src, $thumb_width, $thumb_height) = wp_get_attachment_image_src( $id, array( $width, $height ) );
			$data_icon = '' !== $hover_icon
				? sprintf(
					' data-icon="%1$s"',
					esc_attr( et_pb_process_font_icon( $hover_icon ) )
				)
				: '';
			$image_output = sprintf(
				'<a href="%1$s" title="%2$s">
					<img src="%3$s" alt="%6$s" />
					<span class="et_overlay%4$s"%5$s></span>
				</a>',
				esc_url( $full_src ),
				esc_attr( $attachment->post_title ),
				esc_url( $thumb_src ),
				( '' !== $hover_icon ? ' et_pb_inline_icon' : '' ),
				$data_icon,
				esc_attr( get_post_meta($attachment->ID, '_wp_attachment_image_alt', true) )
			);
			$orientation = ( $thumb_height > $thumb_width ) ? 'portrait' : 'landscape';
			$output .= sprintf(
				'<div class="et_pb_gallery_item%2$s%1$s">',
				esc_attr( $background_class ),
				( 'on' !== $fullwidth ? ' et_pb_grid_item' : '' )
			);
			$output .= "
				<div class='et_pb_gallery_image {$orientation}'>
					$image_output
				</div>";
			if ( 'on' !== $fullwidth && 'on' === $show_title_and_caption ) {
				if ( trim($attachment->post_title) ) {
					$output .= "
						<h3 class='et_pb_gallery_title'>
						" . wptexturize($attachment->post_title) . "
						</h3>";
				}
				if ( trim($attachment->post_excerpt) ) {
				$output .= "
						<p class='et_pb_gallery_caption'>
						" . wptexturize($attachment->post_excerpt) . "
						</p>";
				}
			}
			$output .= "</div>";
		}
		$output .= "</div><!-- .et_pb_gallery_items -->";
		if ( 'on' !== $fullwidth && 'on' === $show_pagination ) {
			$output .= "<div class='et_pb_gallery_pagination'></div>";
		}
		$output .= "</div><!-- .et_pb_gallery -->";
		return $output;
	}
}