<?php
-
-// functions for media display
-
-// scale down the default size of an image so it's a better fit for the editor and theme
+/**
+ * WordPress API for media display.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Scale 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' 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, 'editor_max_image_size' that will be called
+ * on the calculated array for width and height, respectively. The second
+ * parameter will be the value that was in the $size parameter. The returned
+ * type for the hook is an array with the width as the first element and the
+ * height as the second element.
+ *
+ * @since 2.5.0
+ * @uses wp_constrain_dimensions() This function passes the widths and the heights.
+ *
+ * @param int $width Width of the image
+ * @param int $height Height of the image
+ * @param string|array $size Size of what the result image should be.
+ * @return array Width and height of what the result image should resize to.
+ */
function image_constrain_size_for_editor($width, $height, $size = 'medium') {
+ global $content_width;
if ( is_array($size) ) {
$max_width = $size[0];
$max_height = intval(get_option('medium_size_h'));
// if no width is set, default to the theme content width if available
}
- else { // $size == 'full'
- // we're inserting a full size image into the editor. if it's a really big image we'll scale it down to fit reasonably
- // within the editor itself, and within the theme's content width if it's known. the user can resize it in the editor
- // if they wish.
- if ( !empty($GLOBALS['content_width']) ) {
- $max_width = $GLOBALS['content_width'];
- }
- else
- $max_width = 500;
+ elseif ( $size == 'large' ) {
+ // 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 = intval(get_option('large_size_w'));
+ $max_height = intval(get_option('large_size_h'));
+ if ( intval($content_width) > 0 )
+ $max_width = min( intval($content_width), $max_width );
+ }
+ // $size == 'full' has no constraint
+ else {
+ $max_width = $width;
+ $max_height = $height;
}
list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
}
-// return a width/height string for use in an <img /> tag. Empty values will be omitted.
+/**
+ * Retrieve 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 Optional. Width attribute value.
+ * @param int|string $height Optional. Height attribute value.
+ * @return string HTML attributes for width and, or height.
+ */
function image_hwstring($width, $height) {
$out = '';
if ($width)
return $out;
}
-// Scale an image to fit a particular size (such as 'thumb' or 'medium'), and return an image URL, height and width.
-// The URL might be the original image, or it might be a resized version. This function won't create a new resized copy, it will just return an already resized one if it exists.
-// returns an array($url, $width, $height)
+/**
+ * Scale an image to fit a particular size (such as 'thumb' or 'medium').
+ *
+ * Array with image url, width, height, and whether is intermediate size, in
+ * that order is returned on success is returned. $is_intermediate is true if
+ * $url is a resized image, false if it is the original.
+ *
+ * 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 '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 returned in the function. The first element being the URL
+ * to the new image that was resized.
+ *
+ * @since 2.5.0
+ * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide
+ * resize services.
+ *
+ * @param int $id Attachment ID for image.
+ * @param string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'.
+ * @return bool|array False on failure, array on success.
+ */
function image_downsize($id, $size = 'medium') {
if ( !wp_attachment_is_image($id) )
$img_url = wp_get_attachment_url($id);
$meta = wp_get_attachment_metadata($id);
$width = $height = 0;
+ $is_intermediate = false;
// plugins can use this to provide resize services
if ( $out = apply_filters('image_downsize', false, $id, $size) )
$img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
$width = $intermediate['width'];
$height = $intermediate['height'];
+ $is_intermediate = true;
}
elseif ( $size == 'thumbnail' ) {
// fall back to the old thumbnail
- if ( $thumb_file = wp_get_attachment_thumb_file() && $info = getimagesize($thumb_file) ) {
+ if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
$img_url = str_replace(basename($img_url), basename($thumb_file), $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 and constrain it
- list( $width, $height ) = image_constrain_size_for_editor( $meta['width'], $meta['height'], $size );
+ // any other type: use the real image
+ $width = $meta['width'];
+ $height = $meta['height'];
}
- if ( $img_url)
- return array( $img_url, $width, $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;
}
-// return an <img src /> tag for the given image attachment, scaling it down if requested
+/**
+ * An <img src /> tag for an image attachment, scaling it down if requested.
+ *
+ * The filter 'get_image_tag_class' 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 '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
+ *
+ * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element
+ * class attribute.
+ * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with
+ * all attributes.
+ *
+ * @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 $size Optional. Default is 'medium'.
+ * @return string HTML IMG element for given image attachment
+ */
function get_image_tag($id, $alt, $title, $align, $size='medium') {
list( $img_src, $width, $height ) = image_downsize($id, $size);
$hwstring = image_hwstring($width, $height);
- $html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id.'" />';
+ $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
+ $class = apply_filters('get_image_tag_class', $class, $id, $align, $size);
- $url = '';
- $html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url, $size );
+ $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" title="' . esc_attr($title).'" '.$hwstring.'class="'.$class.'" />';
+
+ $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
return $html;
}
-// same as wp_shrink_dimensions, except the max parameters are optional.
-// if either width or height are empty, no constraint is applied on that dimension.
+/**
+ * Calculates the new dimentions for a downsampled image.
+ *
+ * Same as {@link wp_shrink_dimensions()}, except the max parameters are
+ * optional. 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. Maximum wanted width.
+ * @param int $max_height Optional. Maximum wanted height.
+ * @return array First item is the width, the second item is the height.
+ */
function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
if ( !$max_width and !$max_height )
return array( $current_width, $current_height );
$width_ratio = $height_ratio = 1.0;
- if ( $max_width > 0 && $current_width > $max_width )
+ if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width )
$width_ratio = $max_width / $current_width;
- if ( $max_height > 0 && $current_height > $max_height )
+ if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height )
$height_ratio = $max_height / $current_height;
// the smaller ratio is the one we need to fit it to the constraining box
return array( intval($current_width * $ratio), intval($current_height * $ratio) );
}
-// calculate dimensions and coordinates for a resized image that fits within a specified width and height
-// if $crop is true, the largest matching central portion of the image will be cropped out and resized to the required size
+/**
+ * Retrieve calculated resized dimensions for use in imagecopyresampled().
+ *
+ * Calculate dimensions and coordinates for a resized image that fits within a
+ * specified width and height. If $crop is true, the largest matching central
+ * portion of the image will be cropped out and resized to the required size.
+ *
+ * @since 2.5.0
+ *
+ * @param int $orig_w Original width.
+ * @param int $orig_h Original height.
+ * @param int $dest_w New width.
+ * @param int $dest_h New height.
+ * @param bool $crop Optional, default is false. Whether to crop image or resize.
+ * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
+ */
function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false) {
if ($orig_w <= 0 || $orig_h <= 0)
}
-// Scale down an image to fit a particular size and save a new copy of the image
+/**
+ * Scale down an image to fit a particular size and save a new copy of the image.
+ *
+ * The PNG transparency will be preserved using the function, as well as the
+ * image type. If the file going in is PNG, then the resized image is going to
+ * be PNG. The only supported image types are PNG, GIF, and JPEG.
+ *
+ * Some functionality requires API to exist, so some PHP version may lose out
+ * support. This is not the fault of WordPress (where functionality is
+ * downgraded, not actual defects), but of your PHP version.
+ *
+ * @since 2.5.0
+ *
+ * @param string $file Image file path.
+ * @param int $max_w Maximum width to resize to.
+ * @param int $max_h Maximum height to resize to.
+ * @param bool $crop Optional. Whether to crop image or resize.
+ * @param string $suffix Optional. File Suffix.
+ * @param string $dest_path Optional. New image file path.
+ * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
+ * @return mixed WP_Error on failure. String with new destination path. Array of dimensions from {@link image_resize_dimensions()}
+ */
function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=90) {
$image = wp_load_image( $file );
else {
// all other formats are converted to jpg
$destfilename = "{$dir}/{$name}-{$suffix}.jpg";
- if (!imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality ) ) )
+ if (!imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )
return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
}
return $destfilename;
}
-// resize an image to make a thumbnail or intermediate size, and return metadata describing the new copy
-// returns false if no image was created
+/**
+ * Resize an image to make a thumbnail or intermediate size.
+ *
+ * The returned array has the file size, the image width, and image height. The
+ * filter 'image_make_intermediate_size' can be used to hook in and change the
+ * values of the returned array. The only parameter is the resized file path.
+ *
+ * @since 2.5.0
+ *
+ * @param string $file File path.
+ * @param int $width Image width.
+ * @param int $height Image height.
+ * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
+ * @return bool|array False, if no image was created. Metadata array on success.
+ */
function image_make_intermediate_size($file, $width, $height, $crop=false) {
if ( $width || $height ) {
$resized_file = image_resize($file, $width, $height, $crop);
return false;
}
+/**
+ * Retrieve the image's intermediate size (resized) path, width, and height.
+ *
+ * The $size parameter can be an array with the width and height respectively.
+ * If the size matches the 'sizes' metadata array for width and height, then it
+ * will be used. If there is no direct match, then the nearest image size larger
+ * than the specified size will be used. If nothing is found, then the function
+ * will break out and return false.
+ *
+ * The metadata 'sizes' is used for compatible sizes that can be used for the
+ * parameter $size value.
+ *
+ * The url path will be given, when the $size parameter is a string.
+ *
+ * @since 2.5.0
+ *
+ * @param int $post_id Attachment ID for image.
+ * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
+ * @return bool|array False on failure or array of file path, width, and height on success.
+ */
function image_get_intermediate_size($post_id, $size='thumbnail') {
- if ( !$imagedata = wp_get_attachment_metadata( $post_id ) )
+ if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
return false;
// get the best one for a specified set of dimensions
if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
return false;
-
+
$data = $imagedata['sizes'][$size];
// include the full filesystem path of the intermediate file
if ( empty($data['path']) && !empty($data['file']) ) {
return $data;
}
-// get an image to represent an attachment - a mime icon for files, thumbnail or intermediate size for images
-// returns an array (url, width, height), or false if no image is available
+/**
+ * Retrieve an image to represent an attachment.
+ *
+ * A mime icon for files, thumbnail or intermediate size for images.
+ *
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return bool|array Returns an array (url, width, height), or false, if no image is available.
+ */
function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
-
+
// get a thumbnail or intermediate image if there is one
if ( $image = image_downsize($attachment_id, $size) )
return $image;
+ $src = false;
+
if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
$src_file = $icon_dir . '/' . basename($src);
return false;
}
-// as per wp_get_attachment_image_src, but returns an <img> tag
-function wp_get_attachment_image($attachment_id, $size='thumbnail', $icon = false) {
+/**
+ * Get an HTML img element representing an image attachment
+ *
+ * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array
+ * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return string HTML img element or empty string on failure.
+ */
+function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false) {
$html = '';
$image = wp_get_attachment_image_src($attachment_id, $size, $icon);
$hwstring = image_hwstring($width, $height);
if ( is_array($size) )
$size = join('x', $size);
- $html = '<img src="'.attribute_escape($src).'" '.$hwstring.'class="attachment-'.attribute_escape($size).'" alt="" />';
+ $attachment =& get_post($attachment_id);
+ $attr = array(
+ 'src' => $src,
+ 'class' => "attachment-$size",
+ 'alt' => trim(strip_tags( $attachment->post_excerpt )),
+ 'title' => trim(strip_tags( $attachment->post_title )),
+ );
+ $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
+ $attr = array_map( 'esc_attr', $attr );
+ $html = rtrim("<img $hwstring");
+ foreach ( $attr as $name => $value ) {
+ $html .= " $name=" . '"' . $value . '"';
+ }
+ $html .= ' />';
}
-
+
return $html;
}
+add_shortcode('wp_caption', 'img_caption_shortcode');
+add_shortcode('caption', 'img_caption_shortcode');
+
+/**
+ * The Caption shortcode.
+ *
+ * Allows a plugin to replace the content that would otherwise be returned. The
+ * filter is 'img_caption_shortcode' and passes an empty string, the attr
+ * parameter and the content parameter values.
+ *
+ * The supported attributes for the shortcode are 'id', 'align', 'width', and
+ * 'caption'.
+ *
+ * @since 2.6.0
+ *
+ * @param array $attr Attributes attributed to the shortcode.
+ * @param string $content Optional. Shortcode content.
+ * @return string
+ */
+function img_caption_shortcode($attr, $content = null) {
+
+ // Allow plugins/themes to override the default caption template.
+ $output = apply_filters('img_caption_shortcode', '', $attr, $content);
+ if ( $output != '' )
+ return $output;
+
+ extract(shortcode_atts(array(
+ 'id' => '',
+ 'align' => 'alignnone',
+ 'width' => '',
+ 'caption' => ''
+ ), $attr));
+
+ if ( 1 > (int) $width || empty($caption) )
+ return $content;
+
+ if ( $id ) $id = 'id="' . $id . '" ';
+
+ return '<div ' . $id . 'class="wp-caption ' . $align . '" style="width: ' . (10 + (int) $width) . 'px">'
+ . do_shortcode( $content ) . '<p class="wp-caption-text">' . $caption . '</p></div>';
+}
+
add_shortcode('gallery', 'gallery_shortcode');
+/**
+ * The Gallery shortcode.
+ *
+ * This implements the functionality of the Gallery Shortcode for displaying
+ * WordPress images on a post.
+ *
+ * @since 2.5.0
+ *
+ * @param array $attr Attributes attributed to the shortcode.
+ * @return string HTML content to display gallery.
+ */
function gallery_shortcode($attr) {
global $post;
+ static $instance = 0;
+ $instance++;
+
// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
}
extract(shortcode_atts(array(
- 'orderby' => 'menu_order ASC, ID ASC',
+ 'order' => 'ASC',
+ 'orderby' => 'menu_order ID',
'id' => $post->ID,
'itemtag' => 'dl',
'icontag' => 'dt',
'captiontag' => 'dd',
'columns' => 3,
- 'size' => 'thumbnail',
+ 'size' => 'thumbnail'
), $attr));
$id = intval($id);
- $attachments = get_children("post_parent=$id&post_type=attachment&post_mime_type=image&orderby={$orderby}");
+ $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
if ( empty($attachments) )
return '';
if ( is_feed() ) {
$output = "\n";
- foreach ( $attachments as $id => $attachment )
- $output .= wp_get_attachment_link($id, $size, true) . "\n";
+ foreach ( $attachments as $att_id => $attachment )
+ $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
return $output;
}
- $listtag = tag_escape($listtag);
$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
-
+
+ $selector = "gallery-{$instance}";
+
$output = apply_filters('gallery_style', "
<style type='text/css'>
- .gallery {
+ #{$selector} {
margin: auto;
}
- .gallery-item {
+ #{$selector} .gallery-item {
float: left;
margin-top: 10px;
text-align: center;
width: {$itemwidth}%; }
- .gallery img {
+ #{$selector} img {
border: 2px solid #cfcfcf;
}
- .gallery-caption {
+ #{$selector} .gallery-caption {
margin-left: 0;
}
</style>
<!-- see gallery_shortcode() in wp-includes/media.php -->
- <div class='gallery'>");
+ <div id='$selector' class='gallery galleryid-{$id}'>");
+ $i = 0;
foreach ( $attachments as $id => $attachment ) {
- $link = wp_get_attachment_link($id, $size, true);
+ $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
+
$output .= "<{$itemtag} class='gallery-item'>";
$output .= "
<{$icontag} class='gallery-icon'>
if ( $captiontag && trim($attachment->post_excerpt) ) {
$output .= "
<{$captiontag} class='gallery-caption'>
- {$attachment->post_excerpt}
+ " . wptexturize($attachment->post_excerpt) . "
</{$captiontag}>";
}
$output .= "</{$itemtag}>";
return $output;
}
-function previous_image_link() {
- adjacent_image_link(true);
+/**
+ * Display previous image link that has the same post parent.
+ *
+ * @since 2.5.0
+ * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
+ * @param string $text Optional, default is false. If included, link will reflect $text variable.
+ * @return string HTML content.
+ */
+function previous_image_link($size = 'thumbnail', $text = false) {
+ adjacent_image_link(true, $size, $text);
}
-function next_image_link() {
- adjacent_image_link(false);
+/**
+ * Display next image link that has the same post parent.
+ *
+ * @since 2.5.0
+ * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
+ * @param string $text Optional, default is false. If included, link will reflect $text variable.
+ * @return string HTML content.
+ */
+function next_image_link($size = 'thumbnail', $text = false) {
+ adjacent_image_link(false, $size, $text);
}
-function adjacent_image_link($prev = true) {
+/**
+ * Display next or previous image link that has the same post parent.
+ *
+ * Retrieves the current attachment object from the $post global.
+ *
+ * @since 2.5.0
+ *
+ * @param bool $prev Optional. Default is true to display previous link, true for next.
+ */
+function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {
global $post;
$post = get_post($post);
- $attachments = array_values(get_children("post_parent=$post->post_parent&post_type=attachment&post_mime_type=image&orderby=menu_order ASC, ID ASC"));
+ $attachments = array_values(get_children( array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') ));
foreach ( $attachments as $k => $attachment )
if ( $attachment->ID == $post->ID )
$k = $prev ? $k - 1 : $k + 1;
if ( isset($attachments[$k]) )
- echo wp_get_attachment_link($attachments[$k]->ID, 'thumbnail', true);
+ echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $text);
}
+/**
+ * Retrieve taxonomies attached to the attachment.
+ *
+ * @since 2.5.0
+ *
+ * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object.
+ * @return array Empty array on failure. List of taxonomies on success.
+ */
function get_attachment_taxonomies($attachment) {
if ( is_int( $attachment ) )
$attachment = get_post($attachment);
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