412 lines
14 KiB
PHP
412 lines
14 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, $size = 'medium') {
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if ( is_array($size) ) {
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$max_width = $size[0];
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$max_height = $size[1];
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}
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elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
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$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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}
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else { // $size == 'full'
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// we're inserting a full size image into the editor. if it's a really big image we'll scale it down to fit reasonably
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// within the editor itself, and within the theme's content width if it's known. the user can resize it in the editor
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// if they wish.
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if ( !empty($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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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 $out;
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}
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// Scale an image to fit a particular size (such as 'thumb' or 'medium'), and return an image URL, height and width.
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// The URL might be the original image, or it might be a resized version. This function won't create a new resized copy, it will just return an already resized one if it exists.
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// returns an array($url, $width, $height)
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function image_downsize($id, $size = 'medium') {
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if ( !wp_attachment_is_image($id) )
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return false;
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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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// try for a new style intermediate size
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if ( $intermediate = image_get_intermediate_size($id, $size) ) {
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$img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
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$width = $intermediate['width'];
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$height = $intermediate['height'];
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}
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elseif ( $size == 'thumbnail' ) {
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// fall back to the old thumbnail
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if ( $thumb_file = wp_get_attachment_thumb_file() && $info = getimagesize($thumb_file) ) {
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$img_url = str_replace(basename($img_url), basename($thumb_file), $img_url);
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$width = $info[0];
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$height = $info[1];
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}
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}
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if ( !$width && !$height && isset($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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if ( $img_url)
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return array( $img_url, $width, $height );
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return false;
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}
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// return an <img src /> tag for the given image attachment, scaling it down if requested
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function get_image_tag($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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// same as wp_shrink_dimensions, except the max parameters are optional.
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// if either width or height are empty, no constraint is applied on that dimension.
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function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
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if ( !$max_width and !$max_height )
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return array( $current_width, $current_height );
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$width_ratio = $height_ratio = 1.0;
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if ( $max_width > 0 && $current_width > $max_width )
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$width_ratio = $max_width / $current_width;
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if ( $max_height > 0 && $current_height > $max_height )
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$height_ratio = $max_height / $current_height;
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// the smaller ratio is the one we need to fit it to the constraining box
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$ratio = min( $width_ratio, $height_ratio );
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return array( intval($current_width * $ratio), intval($current_height * $ratio) );
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}
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// calculate dimensions and coordinates for a resized image that fits within a specified width and height
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// if $crop is true, the largest matching central portion of the image will be cropped out and resized to the required size
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function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false) {
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if ($orig_w <= 0 || $orig_h <= 0)
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return false;
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// at least one of dest_w or dest_h must be specific
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if ($dest_w <= 0 && $dest_h <= 0)
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return false;
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if ( $crop ) {
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// crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
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$aspect_ratio = $orig_w / $orig_h;
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$new_w = min($dest_w, $orig_w);
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$new_h = min($dest_h, $orig_h);
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if (!$new_w) {
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$new_w = intval($new_h * $aspect_ratio);
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}
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if (!$new_h) {
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$new_h = intval($new_w / $aspect_ratio);
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}
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$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
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$crop_w = ceil($new_w / $size_ratio);
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$crop_h = ceil($new_h / $size_ratio);
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$s_x = floor(($orig_w - $crop_w)/2);
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$s_y = floor(($orig_h - $crop_h)/2);
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}
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else {
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// don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
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$crop_w = $orig_w;
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$crop_h = $orig_h;
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$s_x = 0;
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$s_y = 0;
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list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
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}
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// if the resulting image would be the same size or larger we don't want to resize it
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if ($new_w >= $orig_w && $new_h >= $orig_h)
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return false;
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// the return array matches the parameters to imagecopyresampled()
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// int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
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return array(0, 0, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_h);
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}
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// Scale down an image to fit a particular size and save a new copy of the image
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function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=75) {
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$image = wp_load_image( $file );
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if ( !is_resource( $image ) )
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return new WP_Error('error_loading_image', $image);
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list($orig_w, $orig_h, $orig_type) = getimagesize( $file );
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$dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
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if (!$dims)
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return $dims;
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list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
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$newimage = imagecreatetruecolor( $dst_w, $dst_h);
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// preserve PNG transparency
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if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
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imagealphablending( $newimage, false);
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imagesavealpha( $newimage, true);
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}
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imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
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// we don't need the original in memory anymore
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imagedestroy( $image );
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// $suffix will be appended to the destination filename, just before the extension
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if ( !$suffix )
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$suffix = "{$dst_w}x{$dst_h}";
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$info = pathinfo($file);
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$dir = $info['dirname'];
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$ext = $info['extension'];
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$name = basename($file, ".{$ext}");
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if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
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$dir = $_dest_path;
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$destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
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if ( $orig_type == IMAGETYPE_GIF ) {
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if (!imagegif( $newimage, $destfilename ) )
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return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
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}
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elseif ( $orig_type == IMAGETYPE_PNG ) {
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if (!imagepng( $newimage, $destfilename ) )
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return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
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}
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else {
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// all other formats are converted to jpg
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$destfilename = "{$dir}/{$name}-{$suffix}.jpg";
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if (!imagejpeg( $newimage, $destfilename, $jpeg_quality ) )
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return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
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}
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imagedestroy( $newimage );
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// Set correct file permissions
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$stat = stat( dirname( $destfilename ));
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$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
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@ chmod( $destfilename, $perms );
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return $destfilename;
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}
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// resize an image to make a thumbnail or intermediate size, and return metadata describing the new copy
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// returns false if no image was created
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function image_make_intermediate_size($file, $width, $height, $crop=false) {
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if ( $width || $height ) {
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$resized_file = image_resize($file, $width, $height, $crop);
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if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {
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return array(
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'file' => basename( $resized_file ),
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'width' => $info[0],
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'height' => $info[1],
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);
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}
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}
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return false;
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}
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function image_get_intermediate_size($post_id, $size='thumbnail') {
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if ( !$imagedata = wp_get_attachment_metadata( $post_id ) )
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return false;
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// get the best one for a specified set of dimensions
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if ( is_array($size) && !empty($imagedata['sizes']) ) {
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foreach ( $imagedata['sizes'] as $_size => $data ) {
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// already cropped to width or height; so use this size
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if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
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$file = $data['file'];
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list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
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return compact( 'file', 'width', 'height' );
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}
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// add to lookup table: area => size
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$areas[$data['width'] * $data['height']] = $_size;
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}
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if ( !$size || !empty($areas) ) {
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// find for the smallest image not smaller than the desired size
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ksort($areas);
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foreach ( $areas as $_size ) {
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$data = $imagedata['sizes'][$_size];
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if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
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$file = $data['file'];
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list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
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return compact( 'file', 'width', 'height' );
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}
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}
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}
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}
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if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
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return false;
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$data = $imagedata['sizes'][$size];
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// include the full filesystem path of the intermediate file
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if ( empty($data['path']) && !empty($data['file']) ) {
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$file_url = wp_get_attachment_url($post_id);
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$data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
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$data['url'] = path_join( dirname($file_url), $data['file'] );
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}
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return $data;
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}
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// get an image to represent an attachment - a mime icon for files, thumbnail or intermediate size for images
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// returns an array (url, width, height), or false if no image is available
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function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
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// get a thumbnail or intermediate image if there is one
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if ( $image = image_downsize($attachment_id, $size) )
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return $image;
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if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
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$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
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$src_file = $icon_dir . '/' . basename($src);
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@list($width, $height) = getimagesize($src_file);
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}
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if ( $src && $width && $height )
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return array( $src, $width, $height );
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return false;
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}
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// as per wp_get_attachment_image_src, but returns an <img> tag
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function wp_get_attachment_image($attachment_id, $size='thumbnail', $icon = false) {
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$html = '';
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$image = wp_get_attachment_image_src($attachment_id, $size, $icon);
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if ( $image ) {
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list($src, $width, $height) = $image;
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$hwstring = image_hwstring($width, $height);
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if ( is_array($size) )
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$size = join('x', $size);
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$html = '<img src="'.attribute_escape($src).'" '.$hwstring.'class="attachment-'.attribute_escape($size).'" />';
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}
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return $html;
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}
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add_shortcode('gallery', 'gallery_shortcode');
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function gallery_shortcode($attr) {
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global $post;
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// Allow plugins/themes to override the default gallery template.
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$output = apply_filters('post_gallery', '', $attr);
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if ( $output != '' )
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return $output;
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$attachments = get_children("post_parent=$post->ID&post_type=attachment&post_mime_type=image&orderby=\"menu_order ASC, ID ASC\"");
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if ( empty($attachments) )
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return '';
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if ( is_feed() ) {
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$output = "\n";
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foreach ( $attachments as $id => $attachment )
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$output .= wp_get_attachment_link($id, 'thumbnail', true) . "\n";
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return $output;
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}
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$output = apply_filters('gallery_style', "
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<style type='text/css'>
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.gallery {
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margin: auto;
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}
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.gallery div {
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float: left;
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margin-top: 10px;
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text-align: center;
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width: 33%; }
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.gallery img {
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border: 2px solid #cfcfcf;
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}
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</style>
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<div class='gallery'>");
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foreach ( $attachments as $id => $attachment ) {
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$link = wp_get_attachment_link($id, 'thumbnail', true);
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$output .= "
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<div>
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$link
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</div>";
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if ( ++$i % 3 == 0 )
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$output .= '<br style="clear: both" />';
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}
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$output .= "
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<br style='clear: both;' >
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</div>\n";
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return $output;
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}
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function previous_image_link() {
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adjacent_image_link(true);
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}
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function next_image_link() {
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adjacent_image_link(false);
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}
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function adjacent_image_link($prev = true) {
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global $post;
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$post = get_post($post);
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$attachments = array_values(get_children("post_parent=$post->post_parent&post_type=attachment&post_mime_type=image&orderby=\"menu_order ASC, ID ASC\""));
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foreach ( $attachments as $k => $attachment )
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if ( $attachment->ID == $post->ID )
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break;
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$k = $prev ? $k - 1 : $k + 1;
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if ( isset($attachments[$k]) )
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echo wp_get_attachment_link($attachments[$k]->ID, 'thumbnail', true);
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}
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?>
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