95 lines
3.4 KiB
PHP
95 lines
3.4 KiB
PHP
<?php
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// functions for media display
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// scale down the default size of an image so it's a better fit for the editor and theme
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function image_constrain_size_for_editor($width, $height, $size = 'medium') {
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if ( $size == 'thumb' ) {
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$max_width = intval(get_option('thumbnail_size_w'));
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$max_height = intval(get_option('thumbnail_size_h'));
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// last chance thumbnail size defaults
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if ( !$max_width && !$max_height ) {
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$max_width = 128;
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$max_height = 96;
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}
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}
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elseif ( $size == 'medium' ) {
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$max_width = intval(get_option('medium_size_w'));
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$max_height = intval(get_option('medium_size_h'));
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// if no width is set, default to the theme content width if available
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if ( !$max_width ) {
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// $content_width might be set in the current theme's functions.php
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if ( !empty($GLOBALS['content_width']) ) {
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$max_width = $GLOBALS['content_width'];
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}
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else
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$max_width = 500;
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}
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}
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else { // $size == 'full'
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$max_width = 0;
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$max_height = 0;
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}
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list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
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return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
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}
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// return a width/height string for use in an <img /> tag. Empty values will be omitted.
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function image_hwstring($width, $height) {
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$out = '';
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if ($width)
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$out .= 'width="'.intval($width).'" ';
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if ($height)
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$out .= 'height="'.intval($height).'" ';
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return $out;
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}
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// Scale an image to fit a particular size (such as 'thumb' or 'medium'), and return an image URL, height and width.
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// The URL might be the original image, or it might be a resized version.
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// returns an array($url, $width, $height)
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function image_downsize($id, $size = 'medium') {
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$img_url = wp_get_attachment_url($id);
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$meta = wp_get_attachment_metadata($id);
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$width = $height = 0;
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// plugins can use this to provide resize services
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if ( $out = apply_filters('image_downsize', false, $id, $size) )
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return $out;
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if ( $size == 'thumb' ) {
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// thumbnail: use the thumb as the displayed image, and constrain based on its dimensions
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$thumb_path = wp_get_attachment_thumb_file($id);
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// the actual thumbnail size isn't stored so we'll have to calculate it
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if ( $thumb_path && ($info = getimagesize($thumb_path)) ) {
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list( $width, $height ) = image_constrain_size_for_editor( $info[0], $info[1], $size );
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$img_url = wp_get_attachment_thumb_url($id);
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}
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// this could be improved to provide a default thumbnail if one doesn't exist
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}
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elseif ( isset($meta['width'], $meta['height']) ) {
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// any other type: use the real image and constrain it
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list( $width, $height ) = image_constrain_size_for_editor( $meta['width'], $meta['height'], $size );
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}
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return array( $img_url, $width, $height );
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}
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// return an <img src /> tag for the given image attachment, scaling it down if requested
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function get_image_tag($id, $alt, $title, $align, $rel = false, $size='medium') {
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list( $img_src, $width, $height ) = image_downsize($id, $size);
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$hwstring = image_hwstring($width, $height);
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$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).' attachment wp-att-'.attribute_escape($id).'" />';
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$html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url );
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return $html;
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}
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?>
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