wp_constrain_dimensions()
Calculates the new dimensions for a down-sampled image.
If either width or height are empty, no constraint is applied on that dimension.
Hooks from the function
Return
Int[]
. An array of width and height values.
Usage
wp_constrain_dimensions( $current_width, $current_height, $max_width, $max_height );
- $current_width(int) (required)
- Current width of the image.
- $current_height(int) (required)
- Current height of the image.
- $max_width(int)
- Max width in pixels to constrain to.
- $max_height(int)
- Max height in pixels to constrain to.
Changelog
Since 2.5.0 | Introduced. |
wp_constrain_dimensions() wp constrain dimensions code WP 6.6.2
function wp_constrain_dimensions( $current_width, $current_height, $max_width = 0, $max_height = 0 ) { if ( ! $max_width && ! $max_height ) { return array( $current_width, $current_height ); } $width_ratio = 1.0; $height_ratio = 1.0; $did_width = false; $did_height = false; if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) { $width_ratio = $max_width / $current_width; $did_width = true; } if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) { $height_ratio = $max_height / $current_height; $did_height = true; } // Calculate the larger/smaller ratios. $smaller_ratio = min( $width_ratio, $height_ratio ); $larger_ratio = max( $width_ratio, $height_ratio ); if ( (int) round( $current_width * $larger_ratio ) > $max_width || (int) round( $current_height * $larger_ratio ) > $max_height ) { // The larger ratio is too big. It would result in an overflow. $ratio = $smaller_ratio; } else { // The larger ratio fits, and is likely to be a more "snug" fit. $ratio = $larger_ratio; } // Very small dimensions may result in 0, 1 should be the minimum. $w = max( 1, (int) round( $current_width * $ratio ) ); $h = max( 1, (int) round( $current_height * $ratio ) ); /* * Sometimes, due to rounding, we'll end up with a result like this: * 465x700 in a 177x177 box is 117x176... a pixel short. * We also have issues with recursive calls resulting in an ever-changing result. * Constraining to the result of a constraint should yield the original result. * Thus we look for dimensions that are one pixel shy of the max value and bump them up. */ // Note: $did_width means it is possible $smaller_ratio == $width_ratio. if ( $did_width && $w === $max_width - 1 ) { $w = $max_width; // Round it up. } // Note: $did_height means it is possible $smaller_ratio == $height_ratio. if ( $did_height && $h === $max_height - 1 ) { $h = $max_height; // Round it up. } /** * Filters dimensions to constrain down-sampled images to. * * @since 4.1.0 * * @param int[] $dimensions { * An array of width and height values. * * @type int $0 The width in pixels. * @type int $1 The height in pixels. * } * @param int $current_width The current width of the image. * @param int $current_height The current height of the image. * @param int $max_width The maximum width permitted. * @param int $max_height The maximum height permitted. */ return apply_filters( 'wp_constrain_dimensions', array( $w, $h ), $current_width, $current_height, $max_width, $max_height ); }