229 lines
8.0 KiB
PHP
229 lines
8.0 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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// 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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?>
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