wp-includes/media.php:543Retrieves calculated resize dimensions for use in WP_Image_Editor.
$orig_wint$orig_hint$dest_wint$dest_hint$cropbool|arrayoptionalfalse$1string
array|false2 hooks fire while image_resize_dimensions() runs, in this order:
Filters whether to preempt calculating the image resize dimensions.
Filters whether to proceed with making an image sub-size with identical dimensions with the original/source image. Differences of 1px may be due to rounding and are ignored.
function image_resize_dimensions( $orig_w, $orig_h, $dest_w, $dest_h, $crop = false ) { if ( $orig_w <= 0 || $orig_h <= 0 ) { return false; } // At least one of $dest_w or $dest_h must be specific. if ( $dest_w <= 0 && $dest_h <= 0 ) { return false; } /** * Filters whether to preempt calculating the image resize dimensions. * * Returning a non-null value from the filter will effectively short-circuit * image_resize_dimensions(), returning that value instead. * * @since 3.4.0 * * @param null|mixed $null Whether to preempt output of the resize dimensions. * @param int $orig_w Original width in pixels. * @param int $orig_h Original height in pixels. * @param int $dest_w New width in pixels. * @param int $dest_h New height in pixels. * @param bool|array $crop Whether to crop image to specified width and height or resize. * An array can specify positioning of the crop area. Default false. */ $output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop ); if ( null !== $output ) { return $output; } // Stop if the destination size is larger than the original image dimensions. if ( empty( $dest_h ) ) { if ( $orig_w < $dest_w ) { return false; } } elseif ( empty( $dest_w ) ) { if ( $orig_h < $dest_h ) { return false; } } else { if ( $orig_w < $dest_w && $orig_h < $dest_h ) { return false; } } if ( $crop ) { /* * Crop the largest possible portion of the original image that we can size to $dest_w x $dest_h. * Note that the requested crop dimensions are used as a maximum bounding box for the original image. * If the original image's width or height is less than the requested width or height * only the greater one will be cropped. * For example when the original image is 600x300, and the requested crop dimensions are 400x400, * the resulting image will be 400x300. */ $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 = (int) round( $new_h * $aspect_ratio ); } if ( ! $new_h ) { $new_h = (int) round( $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 ); if ( ! is_array( $crop ) || count( $crop ) !== 2 ) { $crop = array( 'center', 'center' ); } list( $x, $y ) = $crop; if ( 'left' === $x ) {Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.