331 lines
10 KiB
PHP
331 lines
10 KiB
PHP
<?php
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/**
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* File contains all the administration image manipulation functions.
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*
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* @package WordPress
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* @subpackage Administration
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*/
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/**
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* Create a thumbnail from an Image given a maximum side size.
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*
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* This function can handle most image file formats which PHP supports. If PHP
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* does not have the functionality to save in a file of the same format, the
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* thumbnail will be created as a jpeg.
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*
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* @since 1.2.0
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*
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* @param mixed $file Filename of the original image, Or attachment id.
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* @param int $max_side Maximum length of a single side for the thumbnail.
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* @return string Thumbnail path on success, Error string on failure.
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*/
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function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
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$thumbpath = image_resize( $file, $max_side, $max_side );
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return apply_filters( 'wp_create_thumbnail', $thumbpath );
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}
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/**
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* Crop an Image to a given size.
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*
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* @since 2.1.0
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*
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* @param string|int $src_file The source file or Attachment ID.
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* @param int $src_x The start x position to crop from.
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* @param int $src_y The start y position to crop from.
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* @param int $src_w The width to crop.
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* @param int $src_h The height to crop.
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* @param int $dst_w The destination width.
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* @param int $dst_h The destination height.
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* @param int $src_abs Optional. If the source crop points are absolute.
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* @param string $dst_file Optional. The destination file to write to.
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* @return string New filepath on success, String error message on failure.
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*/
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function wp_crop_image( $src_file, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
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if ( is_numeric( $src_file ) ) // Handle int as attachment ID
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$src_file = get_attached_file( $src_file );
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$src = wp_load_image( $src_file );
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if ( !is_resource( $src ))
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return $src;
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$dst = imagecreatetruecolor( $dst_w, $dst_h );
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if ( $src_abs ) {
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$src_w -= $src_x;
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$src_h -= $src_y;
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}
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if (function_exists('imageantialias'))
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imageantialias( $dst, true );
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imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
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imagedestroy( $src ); // Free up memory
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if ( ! $dst_file )
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$dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
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$dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
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if ( imagejpeg( $dst, $dst_file ) )
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return $dst_file;
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else
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return false;
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}
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/**
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* Generate post image attachment meta data.
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*
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* @since 2.1.0
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*
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* @param int $attachment_id Attachment Id to process.
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* @param string $file Filepath of the Attached image.
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* @return mixed Metadata for attachment.
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*/
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function wp_generate_attachment_metadata( $attachment_id, $file ) {
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$attachment = get_post( $attachment_id );
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$metadata = array();
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if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
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$full_path_file = $file;
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$imagesize = getimagesize( $full_path_file );
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$metadata['width'] = $imagesize[0];
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$metadata['height'] = $imagesize[1];
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list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']);
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$metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
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// Make the file path relative to the upload dir
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if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) { // Get upload directory
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if ( 0 === strpos($file, $uploads['basedir']) ) {// Check that the upload base exists in the file path
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$file = str_replace($uploads['basedir'], '', $file); // Remove upload dir from the file path
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$file = ltrim($file, '/');
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}
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}
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$metadata['file'] = $file;
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// make thumbnails and other intermediate sizes
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$sizes = array('thumbnail', 'medium', 'large');
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$sizes = apply_filters('intermediate_image_sizes', $sizes);
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foreach ($sizes as $size) {
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$resized = image_make_intermediate_size( $full_path_file, get_option("{$size}_size_w"), get_option("{$size}_size_h"), get_option("{$size}_crop") );
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if ( $resized )
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$metadata['sizes'][$size] = $resized;
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}
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// fetch additional metadata from exif/iptc
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$image_meta = wp_read_image_metadata( $full_path_file );
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if ($image_meta)
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$metadata['image_meta'] = $image_meta;
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}
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return apply_filters( 'wp_generate_attachment_metadata', $metadata );
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}
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/**
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* Load an image from a string, if PHP supports it.
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*
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* @since 2.1.0
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*
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* @param string $file Filename of the image to load.
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* @return resource The resulting image resource on success, Error string on failure.
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*/
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function wp_load_image( $file ) {
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if ( is_numeric( $file ) )
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$file = get_attached_file( $file );
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if ( ! file_exists( $file ) )
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return sprintf(__("File '%s' doesn't exist?"), $file);
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if ( ! function_exists('imagecreatefromstring') )
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return __('The GD image library is not installed.');
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// Set artificially high because GD uses uncompressed images in memory
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@ini_set('memory_limit', '256M');
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$image = imagecreatefromstring( file_get_contents( $file ) );
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if ( !is_resource( $image ) )
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return sprintf(__("File '%s' is not an image."), $file);
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return $image;
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}
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/**
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* Calculated the new dimentions for a downsampled image.
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*
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* @since 2.0.0
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* @see wp_shrink_dimensions()
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*
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* @param int $width Current width of the image
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* @param int $height Current height of the image
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* @return mixed Array(height,width) of shrunk dimensions.
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*/
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function get_udims( $width, $height) {
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return wp_shrink_dimensions( $width, $height );
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}
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/**
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* Calculates the new dimentions for a downsampled image.
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*
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* @since 2.0.0
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* @see wp_constrain_dimensions()
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*
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* @param int $width Current width of the image
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* @param int $height Current height of the image
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* @param int $wmax Maximum wanted width
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* @param int $hmax Maximum wanted height
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* @return mixed Array(height,width) of shrunk dimensions.
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*/
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function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
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return wp_constrain_dimensions( $width, $height, $wmax, $hmax );
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}
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/**
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* Convert a fraction string to a decimal.
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*
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* @since 2.5.0
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*
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* @param string $str
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* @return int|float
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*/
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function wp_exif_frac2dec($str) {
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@list( $n, $d ) = explode( '/', $str );
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if ( !empty($d) )
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return $n / $d;
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return $str;
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}
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/**
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* Convert the exif date format to a unix timestamp.
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*
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* @since 2.5.0
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*
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* @param string $str
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* @return int
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*/
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function wp_exif_date2ts($str) {
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@list( $date, $time ) = explode( ' ', trim($str) );
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@list( $y, $m, $d ) = explode( ':', $date );
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return strtotime( "{$y}-{$m}-{$d} {$time}" );
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}
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/**
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* Get extended image metadata, exif or iptc as available.
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*
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* Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
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* created_timestamp, focal_length, shutter_speed, and title.
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*
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* The IPTC metadata that is retrieved is APP13, credit, byline, created date
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* and time, caption, copyright, and title. Also includes FNumber, Model,
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* DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
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*
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* @todo Try other exif libraries if available.
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* @since 2.5.0
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*
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* @param string $file
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* @return bool|array False on failure. Image metadata array on success.
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*/
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function wp_read_image_metadata( $file ) {
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if ( !file_exists( $file ) )
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return false;
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list(,,$sourceImageType) = getimagesize( $file );
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// exif contains a bunch of data we'll probably never need formatted in ways
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// that are difficult to use. We'll normalize it and just extract the fields
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// that are likely to be useful. Fractions and numbers are converted to
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// floats, dates to unix timestamps, and everything else to strings.
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$meta = array(
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'aperture' => 0,
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'credit' => '',
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'camera' => '',
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'caption' => '',
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'created_timestamp' => 0,
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'copyright' => '',
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'focal_length' => 0,
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'iso' => 0,
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'shutter_speed' => 0,
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'title' => '',
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);
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// read iptc first, since it might contain data not available in exif such
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// as caption, description etc
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if ( is_callable('iptcparse') ) {
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getimagesize($file, $info);
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if ( !empty($info['APP13']) ) {
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$iptc = iptcparse($info['APP13']);
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if ( !empty($iptc['2#110'][0]) ) // credit
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$meta['credit'] = utf8_encode(trim($iptc['2#110'][0]));
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elseif ( !empty($iptc['2#080'][0]) ) // byline
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$meta['credit'] = utf8_encode(trim($iptc['2#080'][0]));
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if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created date and time
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$meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
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if ( !empty($iptc['2#120'][0]) ) // caption
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$meta['caption'] = utf8_encode(trim($iptc['2#120'][0]));
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if ( !empty($iptc['2#116'][0]) ) // copyright
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$meta['copyright'] = utf8_encode(trim($iptc['2#116'][0]));
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if ( !empty($iptc['2#005'][0]) ) // title
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$meta['title'] = utf8_encode(trim($iptc['2#005'][0]));
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}
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}
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// fetch additional info from exif if available
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if ( is_callable('exif_read_data') && in_array($sourceImageType, apply_filters('wp_read_image_metadata_types', array(IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM)) ) ) {
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$exif = @exif_read_data( $file );
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if (!empty($exif['FNumber']))
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$meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
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if (!empty($exif['Model']))
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$meta['camera'] = trim( $exif['Model'] );
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if (!empty($exif['DateTimeDigitized']))
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$meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']);
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if (!empty($exif['FocalLength']))
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$meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
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if (!empty($exif['ISOSpeedRatings']))
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$meta['iso'] = $exif['ISOSpeedRatings'];
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if (!empty($exif['ExposureTime']))
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$meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
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}
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return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
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}
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/**
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* Validate that file is an image.
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*
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* @since 2.5.0
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*
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* @param string $path File path to test if valid image.
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* @return bool True if valid image, false if not valid image.
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*/
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function file_is_valid_image($path) {
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$size = @getimagesize($path);
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return !empty($size);
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}
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/**
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* Validate that file is suitable for displaying within a web page.
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*
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* @since 2.5.0
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* @uses apply_filters() Calls 'file_is_displayable_image' on $result and $path.
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*
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* @param string $path File path to test.
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* @return bool True if suitable, false if not suitable.
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*/
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function file_is_displayable_image($path) {
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$info = @getimagesize($path);
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if ( empty($info) )
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$result = false;
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elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) ) // only gif, jpeg and png images can reliably be displayed
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$result = false;
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else
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$result = true;
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return apply_filters('file_is_displayable_image', $result, $path);
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}
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?>
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