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3d04ae4f29
git-svn-id: http://svn.automattic.com/wordpress/trunk@6309 1a063a9b-81f0-0310-95a4-ce76da25c4cd
226 lines
7.3 KiB
PHP
226 lines
7.3 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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*/
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/**
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* wp_create_thumbnail() - Create a thumbnail from an Image given a maximum side size.
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*
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* @package WordPress
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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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* This function can handle most image file formats which PHP supports.
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* If PHP does not have the functionality to save in a file of the same format, the thumbnail will be created as a jpeg.
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*/
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function wp_create_thumbnail( $file, $max_side, $depreciated = '' ) {
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if ( ctype_digit( $file ) ) // Handle int as attachment ID
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$file = get_attached_file( $file );
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$image = wp_load_image( $file );
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if ( !is_resource( $image ) )
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return $image;
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list($sourceImageWidth, $sourceImageHeight, $sourceImageType) = getimagesize( $file );
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if ( function_exists( 'imageantialias' ))
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imageantialias( $image, true );
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list($image_new_width, $image_new_height) = wp_shrink_dimensions( $sourceImageWidth, $sourceImageHeight, $max_side, $max_side);
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$thumbnail = imagecreatetruecolor( $image_new_width, $image_new_height);
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@ imagecopyresampled( $thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $sourceImageWidth, $sourceImageHeight );
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imagedestroy( $image ); // Free up memory
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// If no filters change the filename, we'll do a default transformation.
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if ( basename( $file ) == $thumb = apply_filters( 'thumbnail_filename', basename( $file ) ) )
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$thumb = preg_replace( '!(\.[^.]+)?$!', '.thumbnail$1', basename( $file ), 1 );
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$thumbpath = str_replace( basename( $file ), $thumb, $file );
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switch( $sourceImageType ){
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default: // We'll create a Jpeg if we cant use its native file format
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$thumb = preg_replace( '/\\.[^\\.]+$/', '.jpg', $thumb ); //Change file extension to Jpg
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case IMAGETYPE_JPEG:
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if (!imagejpeg( $thumbnail, $thumbpath ) )
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return __( 'Thumbnail path invalid' );
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break;
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case IMAGETYPE_GIF:
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if (!imagegif( $thumbnail, $thumbpath ) )
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return __( 'Thumbnail path invalid' );
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break;
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case IMAGETYPE_PNG:
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if (!imagepng( $thumbnail, $thumbpath ) )
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return __( 'Thumbnail path invalid' );
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break;
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}
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imagedestroy( $thumbnail ); // Free up memory
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// Set correct file permissions
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$stat = stat( dirname( $thumbpath ));
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$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
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@ chmod( $thumbpath, $perms );
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return apply_filters( 'wp_create_thumbnail', $thumbpath );
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}
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/**
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* wp_crop_image() - Crop an Image to a given size.
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*
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* @package WordPress
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* @internal Missing Long Description
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* @param int $src_file The source file
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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 If the source crop points are absolute
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* @param int $dst_file 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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*/
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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 ( ctype_digit( $src_file ) ) // Handle int as attachment ID
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$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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* wp_generate_attachment_metadata() - Generate post Image attachment Metadata
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*
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* @package WordPress
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* @internal Missing Long Description
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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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*/
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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( $attachment )) ) {
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$imagesize = getimagesize( $file );
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$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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$metadata['file'] = $file;
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$max = apply_filters( 'wp_thumbnail_creation_size_limit', 3 * 1024 * 1024, $attachment_id, $file );
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if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) {
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$max_side = apply_filters( 'wp_thumbnail_max_side_length', 128, $attachment_id, $file );
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$thumb = wp_create_thumbnail( $file, $max_side );
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if ( @file_exists($thumb) )
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$metadata['thumb'] = basename($thumb);
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}
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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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* wp_load_image() - Load an image which PHP Supports.
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*
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* @package WordPress
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* @internal Missing Long Description
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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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*/
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function wp_load_image( $file ) {
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if ( ctype_digit( $file ) )
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$file = get_attached_file( $file );
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if ( ! file_exists( $file ) )
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return sprintf(__("File '%s' doesn't exist?"), $file);
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if ( ! function_exists('imagecreatefromstring') )
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return __('The GD image library is not installed.');
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$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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* get_udims() - Calculated the new dimentions for downsampled images
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*
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* @package WordPress
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* @internal Missing Description
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* @see wp_shrink_dimensions()
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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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*/
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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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* wp_shrink_dimensions() - Calculates the new dimentions for a downsampled image.
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*
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* @package WordPress
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* @internal Missing Long Description
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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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*/
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function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
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if ( $height <= $hmax && $width <= $wmax ){
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//Image is smaller than max
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return array( $width, $height);
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} elseif ( $width / $height > $wmax / $hmax ) {
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//Image Width will be greatest
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return array( $wmax, (int) ($height / $width * $wmax ));
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} else {
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//Image Height will be greatest
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return array( (int) ($width / $height * $hmax ), $hmax );
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}
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}
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?>
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