Product Configurator - 300 DPI image output

product_configurator_300_dpi.php

<?php // DO NOT INCLUDE THIS LINE!
// Replace the generate_image function in class-ajax.php with this modified function.

/**
 * Generate final image.
 */
public static function generate_image() {
	global $jckpc;

	$params = self::ajax_img_get_params();

	// Set up image space.
	$canvas_width  = $params['images']['background']['full'][1];
	$canvas_height = $params['images']['background']['full'][2];
	$bg            = imagecreatetruecolor( $canvas_width, $canvas_height );

	// BEGIN MODIFICATION.
	// Note: PHP 7.2 or higher must be installed for this to work.
	if ( function_exists( 'imageresolution' ) ) {
		imageresolution( $bg, 300, 300 );
	}
	// END MODIFICATION.

	imagesavealpha( $bg, true );

	$trans_colour = imagecolorallocatealpha( $bg, 0, 0, 0, 127 );
	imagefill( $bg, 0, 0, $trans_colour );

	if ( is_array( $params['images'] ) ) {
		foreach ( $params['images'] as $index => $image_data ) {
			if ( empty( $image_data['path'] ) ) {
				continue;
			}

			$img = imagecreatefrompng( $image_data['path'] );

			if ( ! $img ) {
				continue;
			}

			imagecopyresized( $bg, $img, 0, 0, 0, 0, $canvas_width, $canvas_height, $canvas_width, $canvas_height );
			imagedestroy( $img );
		}
	}

	// BEGIN MODIFICATION.
	header( 'Content-Type: image/png; filename="Product_Image-output-merged-.png"' );
	// END MODIFICATION.
	$final_image = imagepng( $bg, $params['imgData']['finalImgPath'] );

	if ( $final_image ) {
		set_transient( $params['imgData']['imgName'], $params['imgData']['finalImgUrl'], $jckpc->settings['general_cache_duration'] * HOUR_IN_SECONDS );
		imagepng( $bg );
	}

	die;
}