--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-admin/includes/image.php Wed Feb 03 15:37:20 2010 +0000
@@ -0,0 +1,343 @@
+<?php
+/**
+ * File contains all the administration image manipulation functions.
+ *
+ * @package WordPress
+ * @subpackage Administration
+ */
+
+/**
+ * Create a thumbnail from an Image given a maximum side size.
+ *
+ * This function can handle most image file formats which PHP supports. If PHP
+ * does not have the functionality to save in a file of the same format, the
+ * thumbnail will be created as a jpeg.
+ *
+ * @since 1.2.0
+ *
+ * @param mixed $file Filename of the original image, Or attachment id.
+ * @param int $max_side Maximum length of a single side for the thumbnail.
+ * @return string Thumbnail path on success, Error string on failure.
+ */
+function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
+ $thumbpath = image_resize( $file, $max_side, $max_side );
+ return apply_filters( 'wp_create_thumbnail', $thumbpath );
+}
+
+/**
+ * Crop an Image to a given size.
+ *
+ * @since 2.1.0
+ *
+ * @param string|int $src_file The source file or Attachment ID.
+ * @param int $src_x The start x position to crop from.
+ * @param int $src_y The start y position to crop from.
+ * @param int $src_w The width to crop.
+ * @param int $src_h The height to crop.
+ * @param int $dst_w The destination width.
+ * @param int $dst_h The destination height.
+ * @param int $src_abs Optional. If the source crop points are absolute.
+ * @param string $dst_file Optional. The destination file to write to.
+ * @return string New filepath on success, String error message on failure.
+ */
+function wp_crop_image( $src_file, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
+ if ( is_numeric( $src_file ) ) // Handle int as attachment ID
+ $src_file = get_attached_file( $src_file );
+
+ $src = wp_load_image( $src_file );
+
+ if ( !is_resource( $src ))
+ return $src;
+
+ $dst = wp_imagecreatetruecolor( $dst_w, $dst_h );
+
+ if ( $src_abs ) {
+ $src_w -= $src_x;
+ $src_h -= $src_y;
+ }
+
+ if (function_exists('imageantialias'))
+ imageantialias( $dst, true );
+
+ imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
+
+ imagedestroy( $src ); // Free up memory
+
+ if ( ! $dst_file )
+ $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
+
+ $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
+
+ if ( imagejpeg( $dst, $dst_file, apply_filters( 'jpeg_quality', 90, 'wp_crop_image' ) ) )
+ return $dst_file;
+ else
+ return false;
+}
+
+/**
+ * Generate post thumbnail attachment meta data.
+ *
+ * @since 2.1.0
+ *
+ * @param int $attachment_id Attachment Id to process.
+ * @param string $file Filepath of the Attached image.
+ * @return mixed Metadata for attachment.
+ */
+function wp_generate_attachment_metadata( $attachment_id, $file ) {
+ $attachment = get_post( $attachment_id );
+
+ $metadata = array();
+ if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
+ $imagesize = getimagesize( $file );
+ $metadata['width'] = $imagesize[0];
+ $metadata['height'] = $imagesize[1];
+ list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']);
+ $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
+
+ // Make the file path relative to the upload dir
+ $metadata['file'] = _wp_relative_upload_path($file);
+
+ // make thumbnails and other intermediate sizes
+ global $_wp_additional_image_sizes;
+ $temp_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes
+ if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )
+ $temp_sizes = array_merge( $temp_sizes, array_keys( $_wp_additional_image_sizes ) );
+
+ $temp_sizes = apply_filters( 'intermediate_image_sizes', $temp_sizes );
+
+ foreach ( $temp_sizes as $s ) {
+ $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => FALSE );
+ if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
+ $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
+ else
+ $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
+ if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
+ $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
+ else
+ $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
+ if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
+ $sizes[$s]['crop'] = intval( $_wp_additional_image_sizes[$s]['crop'] ); // For theme-added sizes
+ else
+ $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
+ }
+
+ $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );
+
+ foreach ($sizes as $size => $size_data ) {
+ $resized = image_make_intermediate_size( $file, $size_data['width'], $size_data['height'], $size_data['crop'] );
+ if ( $resized )
+ $metadata['sizes'][$size] = $resized;
+ }
+
+ // fetch additional metadata from exif/iptc
+ $image_meta = wp_read_image_metadata( $file );
+ if ( $image_meta )
+ $metadata['image_meta'] = $image_meta;
+
+ }
+
+ return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id );
+}
+
+/**
+ * Load an image from a string, if PHP supports it.
+ *
+ * @since 2.1.0
+ *
+ * @param string $file Filename of the image to load.
+ * @return resource The resulting image resource on success, Error string on failure.
+ */
+function wp_load_image( $file ) {
+ if ( is_numeric( $file ) )
+ $file = get_attached_file( $file );
+
+ if ( ! file_exists( $file ) )
+ return sprintf(__('File “%s” doesn’t exist?'), $file);
+
+ if ( ! function_exists('imagecreatefromstring') )
+ return __('The GD image library is not installed.');
+
+ // Set artificially high because GD uses uncompressed images in memory
+ @ini_set('memory_limit', '256M');
+ $image = imagecreatefromstring( file_get_contents( $file ) );
+
+ if ( !is_resource( $image ) )
+ return sprintf(__('File “%s” is not an image.'), $file);
+
+ return $image;
+}
+
+/**
+ * Calculated the new dimentions for a downsampled image.
+ *
+ * @since 2.0.0
+ * @see wp_shrink_dimensions()
+ *
+ * @param int $width Current width of the image
+ * @param int $height Current height of the image
+ * @return mixed Array(height,width) of shrunk dimensions.
+ */
+function get_udims( $width, $height) {
+ return wp_shrink_dimensions( $width, $height );
+}
+
+/**
+ * Calculates the new dimentions for a downsampled image.
+ *
+ * @since 2.0.0
+ * @see wp_constrain_dimensions()
+ *
+ * @param int $width Current width of the image
+ * @param int $height Current height of the image
+ * @param int $wmax Maximum wanted width
+ * @param int $hmax Maximum wanted height
+ * @return mixed Array(height,width) of shrunk dimensions.
+ */
+function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
+ return wp_constrain_dimensions( $width, $height, $wmax, $hmax );
+}
+
+/**
+ * Convert a fraction string to a decimal.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str
+ * @return int|float
+ */
+function wp_exif_frac2dec($str) {
+ @list( $n, $d ) = explode( '/', $str );
+ if ( !empty($d) )
+ return $n / $d;
+ return $str;
+}
+
+/**
+ * Convert the exif date format to a unix timestamp.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str
+ * @return int
+ */
+function wp_exif_date2ts($str) {
+ @list( $date, $time ) = explode( ' ', trim($str) );
+ @list( $y, $m, $d ) = explode( ':', $date );
+
+ return strtotime( "{$y}-{$m}-{$d} {$time}" );
+}
+
+/**
+ * Get extended image metadata, exif or iptc as available.
+ *
+ * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
+ * created_timestamp, focal_length, shutter_speed, and title.
+ *
+ * The IPTC metadata that is retrieved is APP13, credit, byline, created date
+ * and time, caption, copyright, and title. Also includes FNumber, Model,
+ * DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
+ *
+ * @todo Try other exif libraries if available.
+ * @since 2.5.0
+ *
+ * @param string $file
+ * @return bool|array False on failure. Image metadata array on success.
+ */
+function wp_read_image_metadata( $file ) {
+ if ( !file_exists( $file ) )
+ return false;
+
+ list(,,$sourceImageType) = getimagesize( $file );
+
+ // exif contains a bunch of data we'll probably never need formatted in ways
+ // that are difficult to use. We'll normalize it and just extract the fields
+ // that are likely to be useful. Fractions and numbers are converted to
+ // floats, dates to unix timestamps, and everything else to strings.
+ $meta = array(
+ 'aperture' => 0,
+ 'credit' => '',
+ 'camera' => '',
+ 'caption' => '',
+ 'created_timestamp' => 0,
+ 'copyright' => '',
+ 'focal_length' => 0,
+ 'iso' => 0,
+ 'shutter_speed' => 0,
+ 'title' => '',
+ );
+
+ // read iptc first, since it might contain data not available in exif such
+ // as caption, description etc
+ if ( is_callable('iptcparse') ) {
+ getimagesize($file, $info);
+ if ( !empty($info['APP13']) ) {
+ $iptc = iptcparse($info['APP13']);
+ if ( !empty($iptc['2#110'][0]) ) // credit
+ $meta['credit'] = utf8_encode(trim($iptc['2#110'][0]));
+ elseif ( !empty($iptc['2#080'][0]) ) // byline
+ $meta['credit'] = utf8_encode(trim($iptc['2#080'][0]));
+ if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created date and time
+ $meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
+ if ( !empty($iptc['2#120'][0]) ) // caption
+ $meta['caption'] = utf8_encode(trim($iptc['2#120'][0]));
+ if ( !empty($iptc['2#116'][0]) ) // copyright
+ $meta['copyright'] = utf8_encode(trim($iptc['2#116'][0]));
+ if ( !empty($iptc['2#005'][0]) ) // title
+ $meta['title'] = utf8_encode(trim($iptc['2#005'][0]));
+ }
+ }
+
+ // fetch additional info from exif if available
+ 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)) ) ) {
+ $exif = @exif_read_data( $file );
+ if (!empty($exif['FNumber']))
+ $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
+ if (!empty($exif['Model']))
+ $meta['camera'] = trim( $exif['Model'] );
+ if (!empty($exif['DateTimeDigitized']))
+ $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']);
+ if (!empty($exif['FocalLength']))
+ $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
+ if (!empty($exif['ISOSpeedRatings']))
+ $meta['iso'] = $exif['ISOSpeedRatings'];
+ if (!empty($exif['ExposureTime']))
+ $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
+ }
+
+ return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
+
+}
+
+/**
+ * Validate that file is an image.
+ *
+ * @since 2.5.0
+ *
+ * @param string $path File path to test if valid image.
+ * @return bool True if valid image, false if not valid image.
+ */
+function file_is_valid_image($path) {
+ $size = @getimagesize($path);
+ return !empty($size);
+}
+
+/**
+ * Validate that file is suitable for displaying within a web page.
+ *
+ * @since 2.5.0
+ * @uses apply_filters() Calls 'file_is_displayable_image' on $result and $path.
+ *
+ * @param string $path File path to test.
+ * @return bool True if suitable, false if not suitable.
+ */
+function file_is_displayable_image($path) {
+ $info = @getimagesize($path);
+ if ( empty($info) )
+ $result = false;
+ elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) ) // only gif, jpeg and png images can reliably be displayed
+ $result = false;
+ else
+ $result = true;
+
+ return apply_filters('file_is_displayable_image', $result, $path);
+}