<?php

/**

 * WordPress API for media display.

 *

 * @package WordPress

 * @subpackage Media

 */

/**

 * Retrieves additional image sizes.

 *

 * @since 4.7.0

 *

 * @global array $_wp_additional_image_sizes

 *

 * @return array Additional images size data.

 */

function wp_get_additional_image_sizes() {

	global $_wp_additional_image_sizes;

	if ( ! $_wp_additional_image_sizes ) {

		$_wp_additional_image_sizes = array();

	}

	return $_wp_additional_image_sizes;

}

/**

 * Scales down the default size of an image.

 *

 * This is so that the image is a better fit for the editor and theme.

 *

 * The `$size` parameter accepts either an array or a string. The supported string

 * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at

 * 128 width and 96 height in pixels. Also supported for the string value is

 * 'medium', 'medium_large' and 'full'. The 'full' isn't actually supported, but any value other

 * than the supported will result in the content_width size or 500 if that is

 * not set.

 *

 * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be

 * called on the calculated array for width and height, respectively.

 *

 * @since 2.5.0

 *

 * @global int $content_width

 *

 * @param int          $width   Width of the image in pixels.

 * @param int          $height  Height of the image in pixels.

 * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array

 *                              of width and height values in pixels (in that order). Default 'medium'.

 * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'

 *                              (like inserting into an editor). Default null.

 * @return int[] {

 *     An array of width and height values.

 *

 *     @type int $0 The maximum width in pixels.

 *     @type int $1 The maximum height in pixels.

 * }

 */

function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {

	global $content_width;

	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	if ( ! $context ) {

		$context = is_admin() ? 'edit' : 'display';

	}

	if ( is_array( $size ) ) {

		$max_width  = $size[0];

		$max_height = $size[1];

	} elseif ( 'thumb' === $size || 'thumbnail' === $size ) {

		$max_width  = (int) get_option( 'thumbnail_size_w' );

		$max_height = (int) get_option( 'thumbnail_size_h' );

		// Last chance thumbnail size defaults.

		if ( ! $max_width && ! $max_height ) {

			$max_width  = 128;

			$max_height = 96;

		}

	} elseif ( 'medium' === $size ) {

		$max_width  = (int) get_option( 'medium_size_w' );

		$max_height = (int) get_option( 'medium_size_h' );

	} elseif ( 'medium_large' === $size ) {

		$max_width  = (int) get_option( 'medium_large_size_w' );

		$max_height = (int) get_option( 'medium_large_size_h' );

		if ( (int) $content_width > 0 ) {

			$max_width = min( (int) $content_width, $max_width );

		}

	} elseif ( 'large' === $size ) {

		/*

		 * We're inserting a large size image into the editor. If it's a really

		 * big image we'll scale it down to fit reasonably within the editor

		 * itself, and within the theme's content width if it's known. The user

		 * can resize it in the editor if they wish.

		 */

		$max_width  = (int) get_option( 'large_size_w' );

		$max_height = (int) get_option( 'large_size_h' );

		if ( (int) $content_width > 0 ) {

			$max_width = min( (int) $content_width, $max_width );

		}

	} elseif ( ! empty( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ), true ) ) {

		$max_width  = (int) $_wp_additional_image_sizes[ $size ]['width'];

		$max_height = (int) $_wp_additional_image_sizes[ $size ]['height'];

		// Only in admin. Assume that theme authors know what they're doing.

		if ( (int) $content_width > 0 && 'edit' === $context ) {

			$max_width = min( (int) $content_width, $max_width );

		}

	} else { // $size === 'full' has no constraint.

		$max_width  = $width;

		$max_height = $height;

	}

	/**

	 * Filters the maximum image size dimensions for the editor.

	 *

	 * @since 2.5.0

	 *

	 * @param int[]        $max_image_size {

	 *     An array of width and height values.

	 *

	 *     @type int $0 The maximum width in pixels.

	 *     @type int $1 The maximum height in pixels.

	 * }

	 * @param string|int[] $size     Requested image size. Can be any registered image size name, or

	 *                               an array of width and height values in pixels (in that order).

	 * @param string       $context  The context the image is being resized for.

	 *                               Possible values are 'display' (like in a theme)

	 *                               or 'edit' (like inserting into an editor).

	 */

	list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context );

	return wp_constrain_dimensions( $width, $height, $max_width, $max_height );

}

/**

 * Retrieves width and height attributes using given width and height values.

 *

 * Both attributes are required in the sense that both parameters must have a

 * value, but are optional in that if you set them to false or null, then they

 * will not be added to the returned string.

 *

 * You can set the value using a string, but it will only take numeric values.

 * If you wish to put 'px' after the numbers, then it will be stripped out of

 * the return.

 *

 * @since 2.5.0

 *

 * @param int|string $width  Image width in pixels.

 * @param int|string $height Image height in pixels.

 * @return string HTML attributes for width and, or height.

 */

function image_hwstring( $width, $height ) {

	$out = '';

	if ( $width ) {

		$out .= 'width="' . (int) $width . '" ';

	}

	if ( $height ) {

		$out .= 'height="' . (int) $height . '" ';

	}

	return $out;

}

/**

 * Scales an image to fit a particular size (such as 'thumb' or 'medium').

 *

 * The URL might be the original image, or it might be a resized version. This

 * function won't create a new resized copy, it will just return an already

 * resized one if it exists.

 *

 * A plugin may use the {@see 'image_downsize'} filter to hook into and offer image

 * resizing services for images. The hook must return an array with the same

 * elements that are normally returned from the function.

 *

 * @since 2.5.0

 *

 * @param int          $id   Attachment ID for image.

 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array

 *                           of width and height values in pixels (in that order). Default 'medium'.

 * @return array|false {

 *     Array of image data, or boolean false if no image is available.

 *

 *     @type string $0 Image source URL.

 *     @type int    $1 Image width in pixels.

 *     @type int    $2 Image height in pixels.

 *     @type bool   $3 Whether the image is a resized image.

 * }

 */

function image_downsize( $id, $size = 'medium' ) {

	$is_image = wp_attachment_is_image( $id );

	/**

	 * Filters whether to preempt the output of image_downsize().

	 *

	 * Returning a truthy value from the filter will effectively short-circuit

	 * down-sizing the image, returning that value instead.

	 *

	 * @since 2.5.0

	 *

	 * @param bool|array   $downsize Whether to short-circuit the image downsize.

	 * @param int          $id       Attachment ID for image.

	 * @param string|int[] $size     Requested image size. Can be any registered image size name, or

	 *                               an array of width and height values in pixels (in that order).

	 */

	$out = apply_filters( 'image_downsize', false, $id, $size );

	if ( $out ) {

		return $out;

	}

	$img_url          = wp_get_attachment_url( $id );

	$meta             = wp_get_attachment_metadata( $id );

	$width            = 0;

	$height           = 0;

	$is_intermediate  = false;

	$img_url_basename = wp_basename( $img_url );

	/*

	 * If the file isn't an image, attempt to replace its URL with a rendered image from its meta.

	 * Otherwise, a non-image type could be returned.

	 */

	if ( ! $is_image ) {

		if ( ! empty( $meta['sizes']['full'] ) ) {

			$img_url          = str_replace( $img_url_basename, $meta['sizes']['full']['file'], $img_url );

			$img_url_basename = $meta['sizes']['full']['file'];

			$width            = $meta['sizes']['full']['width'];

			$height           = $meta['sizes']['full']['height'];

		} else {

			return false;

		}

	}

	// Try for a new style intermediate size.

	$intermediate = image_get_intermediate_size( $id, $size );

	if ( $intermediate ) {

		$img_url         = str_replace( $img_url_basename, $intermediate['file'], $img_url );

		$width           = $intermediate['width'];

		$height          = $intermediate['height'];

		$is_intermediate = true;

	} elseif ( 'thumbnail' === $size && ! empty( $meta['thumb'] ) && is_string( $meta['thumb'] ) ) {

		// Fall back to the old thumbnail.

		$imagefile = get_attached_file( $id );

		$thumbfile = str_replace( wp_basename( $imagefile ), wp_basename( $meta['thumb'] ), $imagefile );

		if ( file_exists( $thumbfile ) ) {

			$info = wp_getimagesize( $thumbfile );

			if ( $info ) {

				$img_url         = str_replace( $img_url_basename, wp_basename( $thumbfile ), $img_url );

				$width           = $info[0];

				$height          = $info[1];

				$is_intermediate = true;

			}

		}

	}

	if ( ! $width && ! $height && isset( $meta['width'], $meta['height'] ) ) {

		// Any other type: use the real image.

		$width  = $meta['width'];

		$height = $meta['height'];

	}

	if ( $img_url ) {

		// We have the actual image size, but might need to further constrain it if content_width is narrower.

		list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );

		return array( $img_url, $width, $height, $is_intermediate );

	}

	return false;

}

/**

 * Registers a new image size.

 *

 * @since 2.9.0

 *

 * @global array $_wp_additional_image_sizes Associative array of additional image sizes.

 *

 * @param string     $name   Image size identifier.

 * @param int        $width  Optional. Image width in pixels. Default 0.

 * @param int        $height Optional. Image height in pixels. Default 0.

 * @param bool|array $crop   {

 *     Optional. Image cropping behavior. If false, the image will be scaled (default).

 *     If true, image will be cropped to the specified dimensions using center positions.

 *     If an array, the image will be cropped using the array to specify the crop location:

 *

 *     @type string $1 The y crop position. Accepts 'top', 'center', or 'bottom'.

 * }

 */

function add_image_size( $name, $width = 0, $height = 0, $crop = false ) {

	global $_wp_additional_image_sizes;

	$_wp_additional_image_sizes[ $name ] = array(

		'width'  => absint( $width ),

		'height' => absint( $height ),

		'crop'   => $crop,

	);

}

/**

 * Checks if an image size exists.

 *

 * @since 3.9.0

 *

 * @param string $name The image size to check.

 * @return bool True if the image size exists, false if not.

 */

function has_image_size( $name ) {

	$sizes = wp_get_additional_image_sizes();

	return isset( $sizes[ $name ] );

}

/**

 * Removes a new image size.

 *

 * @since 3.9.0

 *

 * @global array $_wp_additional_image_sizes

 *

 * @param string $name The image size to remove.

 * @return bool True if the image size was successfully removed, false on failure.

 */

function remove_image_size( $name ) {

	global $_wp_additional_image_sizes;

	if ( isset( $_wp_additional_image_sizes[ $name ] ) ) {

		unset( $_wp_additional_image_sizes[ $name ] );

		return true;

	}

	return false;

}

/**

 * Registers an image size for the post thumbnail.

 *

 * @since 2.9.0

 *

 * @see add_image_size() for details on cropping behavior.

 *

 * @param int        $width  Image width in pixels.

 * @param int        $height Image height in pixels.

 * @param bool|array $crop   {

 *     Optional. Image cropping behavior. If false, the image will be scaled (default).

 *     If true, image will be cropped to the specified dimensions using center positions.

 *     If an array, the image will be cropped using the array to specify the crop location:

 *

 *     @type string $1 The y crop position. Accepts 'top', 'center', or 'bottom'.

 * }

 */

function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {

	add_image_size( 'post-thumbnail', $width, $height, $crop );

}

/**

 * Gets an img tag for an image attachment, scaling it down if requested.

 *

 * The {@see 'get_image_tag_class'} filter allows for changing the class name for the

 * image without having to use regular expressions on the HTML content. The

 * parameters are: what WordPress will use for the class, the Attachment ID,

 * image align value, and the size the image should be.

 *

 * The second filter, {@see 'get_image_tag'}, has the HTML content, which can then be

 * further manipulated by a plugin to change all attribute values and even HTML

 * content.

 *

 * @since 2.5.0

 *

 * @param int          $id    Attachment ID.

 * @param string       $alt   Image description for the alt attribute.

 * @param string       $title Image description for the title attribute.

 * @param string       $align Part of the class name for aligning the image.

 * @param string|int[] $size  Optional. Image size. Accepts any registered image size name, or an array of

 *                            width and height values in pixels (in that order). Default 'medium'.

 * @return string HTML IMG element for given image attachment.

 */

function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {

	list( $img_src, $width, $height ) = image_downsize( $id, $size );

	$hwstring                         = image_hwstring( $width, $height );

	$title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';

	$size_class = is_array( $size ) ? implode( 'x', $size ) : $size;

	$class      = 'align' . esc_attr( $align ) . ' size-' . esc_attr( $size_class ) . ' wp-image-' . $id;

	/**

	 * Filters the value of the attachment's image tag class attribute.

	 *

	 * @since 2.6.0

	 *

	 * @param string       $class CSS class name or space-separated list of classes.

	 * @param int          $id    Attachment ID.

	 * @param string       $align Part of the class name for aligning the image.

	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or

	 *                            an array of width and height values in pixels (in that order).

	 */

	$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

	$html = '<img src="' . esc_url( $img_src ) . '" alt="' . esc_attr( $alt ) . '" ' . $title . $hwstring . 'class="' . $class . '" />';

	/**

	 * Filters the HTML content for the image tag.

	 *

	 * @since 2.6.0

	 *

	 * @param string       $html  HTML content for the image.

	 * @param int          $id    Attachment ID.

	 * @param string       $alt   Image description for the alt attribute.

	 * @param string       $title Image description for the title attribute.

	 * @param string       $align Part of the class name for aligning the image.

	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or

	 *                            an array of width and height values in pixels (in that order).

	 */

	return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );

}

/**

 * Calculates the new dimensions for a down-sampled image.

 *

 * If either width or height are empty, no constraint is applied on

 * that dimension.

 *

 * @since 2.5.0

 *

 * @param int $current_width  Current width of the image.

 * @param int $current_height Current height of the image.

 * @param int $max_width      Optional. Max width in pixels to constrain to. Default 0.

 * @param int $max_height     Optional. Max height in pixels to constrain to. Default 0.

 * @return int[] {

 *     An array of width and height values.

 *

 *     @type int $0 The width in pixels.

 *     @type int $1 The height in pixels.

 * }

 */

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.

	 */