WooCommerce Crop Single Product Image

woocommerce_filters.php

// filter single product image to enable cropping
add_filter('woocommerce_get_image_size_single', 'bb_crop_woo_image', 100);
function bb_crop_woo_image( $size ){
    $size['crop'] = 1;
    $size['height'] = 315;
    return $size;
}

// Or use a different fixed size image on the gallery in the single product page
add_filter( 'woocommerce_gallery_image_size' , 'bb_medium_image_size' );
function bb_medium_image_size( $image ){
    return 'shop_single_image_size'; 
}

// This ismage size name is from WooCommerce pre 3.x
add_image_size( 'shop_single_image_size', '350', '315', true );

// Redirecting Cart Button

add_filter('woocommerce_add_to_cart_redirect', 'themeprefix_add_to_cart_redirect');
function themeprefix_add_to_cart_redirect() {
 global $woocommerce;
 $checkout_url = wc_get_checkout_url();
 return $checkout_url;
}