Cropping Post Thumbnails from Top instead of Center in WordPress

There are widgets or Latest Posts blocks in some WP themes, which are using Post Thumbnails to show the images.
Sometimes it needs to be cropped from top center, but not center as it is set by default. I found a solution.

1. Open functions.php in Theme Editor or Text Editor (Notepad++ / Coda)
2. Add the following code to it and Save

[php]
function px_image_resize_dimensions( $payload, $orig_w, $orig_h, $dest_w, $dest_h, $crop ){

// Change this to a conditional that decides whether you want to override the defaults for this image or not.
if( false )
return $payload;

if ( $crop ) {
// crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
$aspect_ratio = $orig_w / $orig_h;
$new_w = min($dest_w, $orig_w);
$new_h = min($dest_h, $orig_h);

if ( !$new_w ) {
$new_w = intval($new_h * $aspect_ratio);
}

if ( !$new_h ) {
$new_h = intval($new_w / $aspect_ratio);
}

$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

$crop_w = round($new_w / $size_ratio);
$crop_h = round($new_h / $size_ratio);

$s_x = 0; // [[ formerly ]] ==> floor( ($orig_w – $crop_w) / 2 );
$s_y = 0; // [[ formerly ]] ==> floor( ($orig_h – $crop_h) / 2 );
} else {
// don’t crop, just resize using $dest_w x $dest_h as a maximum bounding box
$crop_w = $orig_w;
$crop_h = $orig_h;

$s_x = 0;
$s_y = 0;

list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
}

// if the resulting image would be the same size or larger we don’t want to resize it
if ( $new_w >= $orig_w && $new_h >= $orig_h )
return false;

// the return array matches the parameters to imagecopyresampled()
// int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );

}
add_filter( ‘image_resize_dimensions’, ‘px_image_resize_dimensions’, 10, 6 );

[/php]

3. Download Regenerate Thumbnails plugin and install it. This plugin takes post thumbnails and crops them again using your latest media settings.

4. Go to Tools menu then Regen. Thumbnails
That’s it!