mirror of
https://github.com/WordPress/WordPress.git
synced 2024-11-08 20:01:12 +01:00
de3ab9a05e
git-svn-id: http://svn.automattic.com/wordpress/trunk@7041 1a063a9b-81f0-0310-95a4-ce76da25c4cd
314 lines
11 KiB
PHP
314 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* File contains all the administration image manipulation functions.
|
|
*
|
|
* @package WordPress
|
|
*/
|
|
|
|
/**
|
|
* wp_create_thumbnail() - Create a thumbnail from an Image given a maximum side size.
|
|
*
|
|
* @package WordPress
|
|
* @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
|
|
*
|
|
* 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.
|
|
*/
|
|
function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
|
|
if ( ctype_digit( $file ) ) // Handle int as attachment ID
|
|
$file = get_attached_file( $file );
|
|
|
|
$image = wp_load_image( $file );
|
|
|
|
if ( !is_resource( $image ) )
|
|
return $image;
|
|
|
|
list($sourceImageWidth, $sourceImageHeight, $sourceImageType) = getimagesize( $file );
|
|
|
|
if ( function_exists( 'imageantialias' ))
|
|
imageantialias( $image, true );
|
|
|
|
list($image_new_width, $image_new_height) = wp_shrink_dimensions( $sourceImageWidth, $sourceImageHeight, $max_side, $max_side);
|
|
|
|
$thumbnail = imagecreatetruecolor( $image_new_width, $image_new_height);
|
|
|
|
// preserve PNG transparency
|
|
if ( IMAGETYPE_PNG == $sourceImageType && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
|
|
imagealphablending( $thumbnail, false);
|
|
imagesavealpha( $thumbnail, true);
|
|
}
|
|
|
|
imagecopyresampled( $thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $sourceImageWidth, $sourceImageHeight );
|
|
|
|
imagedestroy( $image ); // Free up memory
|
|
|
|
// If no filters change the filename, we'll do a default transformation.
|
|
if ( basename( $file ) == $thumb = apply_filters( 'thumbnail_filename', basename( $file ) ) )
|
|
$thumb = preg_replace( '!(\.[^.]+)?$!', '.thumbnail$1', basename( $file ), 1 );
|
|
|
|
$thumbpath = str_replace( basename( $file ), $thumb, $file );
|
|
|
|
switch( $sourceImageType ){
|
|
default: // We'll create a Jpeg if we cant use its native file format
|
|
$thumb = preg_replace( '/\\.[^\\.]+$/', '.jpg', $thumb ); //Change file extension to Jpg
|
|
case IMAGETYPE_JPEG:
|
|
if (!imagejpeg( $thumbnail, $thumbpath ) )
|
|
return __( 'Thumbnail path invalid' );
|
|
break;
|
|
case IMAGETYPE_GIF:
|
|
if (!imagegif( $thumbnail, $thumbpath ) )
|
|
return __( 'Thumbnail path invalid' );
|
|
break;
|
|
case IMAGETYPE_PNG:
|
|
if (!imagepng( $thumbnail, $thumbpath ) )
|
|
return __( 'Thumbnail path invalid' );
|
|
break;
|
|
}
|
|
|
|
imagedestroy( $thumbnail ); // Free up memory
|
|
|
|
// Set correct file permissions
|
|
$stat = stat( dirname( $thumbpath ));
|
|
$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
|
|
@ chmod( $thumbpath, $perms );
|
|
|
|
return apply_filters( 'wp_create_thumbnail', $thumbpath );
|
|
}
|
|
|
|
/**
|
|
* wp_crop_image() - Crop an Image to a given size.
|
|
*
|
|
* @package WordPress
|
|
* @internal Missing Long Description
|
|
* @param int $src_file The source file
|
|
* @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 If the source crop points are absolute
|
|
* @param int $dst_file 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 ( ctype_digit( $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 = 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 ) )
|
|
return $dst_file;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* wp_generate_attachment_metadata() - Generate post Image attachment Metadata
|
|
*
|
|
* @package WordPress
|
|
* @internal Missing Long Description
|
|
* @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 )) ) {
|
|
$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'";
|
|
$metadata['file'] = $file;
|
|
|
|
$max = apply_filters( 'wp_thumbnail_creation_size_limit', absint( WP_MEMORY_LIMIT ) * 1024 * 1024, $attachment_id, $file );
|
|
|
|
if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) {
|
|
$max_side = apply_filters( 'wp_thumbnail_max_side_length', 140, $attachment_id, $file );
|
|
$thumb = wp_create_thumbnail( $file, $max_side );
|
|
if ( @file_exists($thumb) )
|
|
$metadata['thumb'] = basename($thumb);
|
|
}
|
|
|
|
// 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 );
|
|
}
|
|
|
|
/**
|
|
* wp_load_image() - Load an image which PHP Supports.
|
|
*
|
|
* @package WordPress
|
|
* @internal Missing Long Description
|
|
* @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 ( ctype_digit( $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;
|
|
}
|
|
|
|
/**
|
|
* get_udims() - Calculated the new dimentions for downsampled images
|
|
*
|
|
* @package WordPress
|
|
* @internal Missing Description
|
|
* @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 );
|
|
}
|
|
/**
|
|
* wp_shrink_dimensions() - Calculates the new dimentions for a downsampled image.
|
|
*
|
|
* @package WordPress
|
|
* @internal Missing Long Description
|
|
* @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, $hmax );
|
|
}
|
|
|
|
// convert a fraction string to a decimal
|
|
function wp_exif_frac2dec($str) {
|
|
@list( $n, $d ) = explode( '/', $str );
|
|
if ( !empty($d) )
|
|
return $n / $d;
|
|
return $str;
|
|
}
|
|
|
|
// convert the exif date format to a unix timestamp
|
|
function wp_exif_date2ts($str) {
|
|
// seriously, who formats a date like 'YYYY:MM:DD hh:mm:ss'?
|
|
@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
|
|
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'] = trim( $iptc['2#110'][0] );
|
|
elseif ( !empty($iptc['2#080'][0]) ) // byline
|
|
$meta['credit'] = trim( $iptc['2#080'][0] );
|
|
if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created datee and time
|
|
$meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
|
|
if ( !empty($iptc['2#120'][0]) ) // caption
|
|
$meta['caption'] = trim( $iptc['2#120'][0] );
|
|
if ( !empty($iptc['2#116'][0]) ) // copyright
|
|
$meta['copyright'] = trim( $iptc['2#116'][0] );
|
|
if ( !empty($iptc['2#005'][0]) ) // title
|
|
$meta['title'] = 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'] );
|
|
}
|
|
// FIXME: try other exif libraries if available
|
|
|
|
return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
|
|
|
|
}
|
|
|
|
|
|
?>
|