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- <?php
- /*
- *
- *
- *
- *
- */
- /* Example Usage:
- * bt_add_image_size( 'product-screenshot', 300, 300, array( 'left', 'top' ) );
- * bt_add_image_size( 'product-feature', 460, 345, array( 'center', 'top' ) );
- */
- add_filter( 'intermediate_image_sizes_advanced', 'bt_intermediate_image_sizes_advanced' );
- add_filter( 'wp_generate_attachment_metadata', 'bt_generate_attachment_metadata', 10, 2 );
- /**
- * Registers a new image size with cropping positions
- *
- * The $crop parameter works as in the 'add_image_size' function taking true or
- * false values. If set to true, the default cropping position is 'center', 'center'.
- *
- * The $crop parameter also takes an array of the format
- * array( x_crop_position, y_crop_position )
- * x_crop_position can be 'left', 'center', 'right'
- * y_crop_position can be 'top', 'center', 'bottom'
- *
- * @param string $name Image size identifier.
- * @param int $width Image width.
- * @param int $height Image height.
- * @param bool|array $crop Optional, default is false. Whether to crop image to specified height and width or resize. An array can specify positioning of the crop area.
- * @return bool|array False, if no image was created. Metadata array on success.
- */
- function bt_add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
- global $_wp_additional_image_sizes;
- $_wp_additional_image_sizes[$name] = array( 'width' => absint( $width ), 'height' => absint( $height ), 'crop' => $crop );
- }
- /**
- * Returning no sizes (an empty array) will force
- * wp_generate_attachment_metadata to skip creating intermediate image sizes on
- * upload, then we can run our own resizing functions by hooking into the
- * 'wp_generate_attachment_metadata' filter
- */
- function bt_intermediate_image_sizes_advanced( $sizes ) {
- return array();
- }
- function bt_generate_attachment_metadata( $metadata, $attachment_id ) {
- $attachment = get_post( $attachment_id );
- $uploadPath = wp_upload_dir();
- $file = path_join($uploadPath['basedir'], $metadata['file']);
- if ( !preg_match('!^image/!', get_post_mime_type( $attachment )) || !file_is_displayable_image( $file ) ) return $metadata;
- global $_wp_additional_image_sizes;
- foreach ( get_intermediate_image_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'] = $_wp_additional_image_sizes[$s]['crop'];
- else
- $sizes[$s]['crop'] = get_option( "{$s}_crop" );
- }
- foreach ( $sizes as $size => $size_data ) {
- $resized = bt_image_make_intermediate_size( $file, $size_data['width'], $size_data['height'], $size_data['crop'] );
- if ( $resized )
- $metadata['sizes'][$size] = $resized;
- }
- return $metadata;
- }
- /**
- * Resize an image to make a thumbnail or intermediate size.
- *
- * The returned array has the file size, the image width, and image height. The
- * filter 'image_make_intermediate_size' can be used to hook in and change the
- * values of the returned array. The only parameter is the resized file path.
- *
- * @param string $file File path.
- * @param int $width Image width.
- * @param int $height Image height.
- * @param bool|array $crop Optional, default is false. Whether to crop image to specified height and width or resize. An array can specify positioning of the crop area.
- * @return bool|array False, if no image was created. Metadata array on success.
- */
- function bt_image_make_intermediate_size( $file, $width, $height, $crop = false ) {
- if ( $width || $height ) {
- $resized_file = bt_image_resize( $file, $width, $height, $crop, null, null, 90 );
- if ( !is_wp_error( $resized_file ) && $resized_file && $info = getimagesize( $resized_file ) ) {
- $resized_file = apply_filters('image_make_intermediate_size', $resized_file);
- return array(
- 'file' => wp_basename( $resized_file ),
- 'width' => $info[0],
- 'height' => $info[1],
- );
- }
- }
- return false;
- }
- /**
- * Retrieve calculated resized dimensions for use in imagecopyresampled().
- *
- * Calculate dimensions and coordinates for a resized image that fits within a
- * specified width and height. If $crop is true, the largest matching central
- * portion of the image will be cropped out and resized to the required size.
- *
- * @param int $orig_w Original width.
- * @param int $orig_h Original height.
- * @param int $dest_w New width.
- * @param int $dest_h New height.
- * @param bool $crop Optional, default is false. Whether to crop image or resize.
- * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
- */
- function bt_image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {
- if ($orig_w <= 0 || $orig_h <= 0)
- return false;
- // at least one of dest_w or dest_h must be specific
- if ($dest_w <= 0 && $dest_h <= 0)
- return false;
- if ( $crop ) {
- // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
- $aspect_ratio = $orig_w / $orig_h;
- $new_w = min($dest_w, $orig_w);
- $new_h = min($dest_h, $orig_h);
- if ( !$new_w ) {
- $new_w = intval($new_h * $aspect_ratio);
- }
- if ( !$new_h ) {
- $new_h = intval($new_w / $aspect_ratio);
- }
- $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
- $crop_w = round($new_w / $size_ratio);
- $crop_h = round($new_h / $size_ratio);
- if ( !is_array( $crop ) || count( $crop ) != 2 ) {
- $crop = apply_filters( 'image_resize_crop_default', array( 'center', 'center' ) );
- }
- switch ( $crop[0] ) {
- case 'left': $s_x = 0; break;
- case 'right': $s_x = $orig_w - $crop_w; break;
- default: $s_x = floor( ( $orig_w - $crop_w ) / 2 );
- }
- switch ( $crop[1] ) {
- case 'top': $s_y = 0; break;
- case 'bottom': $s_y = $orig_h - $crop_h; break;
- default: $s_y = floor( ( $orig_h - $crop_h ) / 2 );
- }
- } else {
- // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
- $crop_w = $orig_w;
- $crop_h = $orig_h;
- $s_x = 0;
- $s_y = 0;
- list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
- }
- // if the resulting image would be the same size or larger we don't want to resize it
- if ( $new_w >= $orig_w && $new_h >= $orig_h )
- return false;
- // the return array matches the parameters to imagecopyresampled()
- // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
- return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
- }
- /**
- * Scale down an image to fit a particular size and save a new copy of the image.
- *
- * The PNG transparency will be preserved using the function, as well as the
- * image type. If the file going in is PNG, then the resized image is going to
- * be PNG. The only supported image types are PNG, GIF, and JPEG.
- *
- * Some functionality requires API to exist, so some PHP version may lose out
- * support. This is not the fault of WordPress (where functionality is
- * downgraded, not actual defects), but of your PHP version.
- *
- * @since 2.5.0
- *
- * @param string $file Image file path.
- * @param int $max_w Maximum width to resize to.
- * @param int $max_h Maximum height to resize to.
- * @param bool $crop Optional. Whether to crop image or resize.
- * @param string $suffix Optional. File Suffix.
- * @param string $dest_path Optional. New image file path.
- * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
- * @return mixed WP_Error on failure. String with new destination path.
- */
- function bt_image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
- $image = wp_load_image( $file );
- if ( !is_resource( $image ) )
- return new WP_Error( 'error_loading_image', $image, $file );
- $size = @getimagesize( $file );
- if ( !$size )
- return new WP_Error('invalid_image', __('Could not read image size'), $file);
- list($orig_w, $orig_h, $orig_type) = $size;
- // Rotate if EXIF 'Orientation' is set
- // This code is from the reverted patch at
- // http://core.trac.wordpress.org/changeset/11746/trunk/wp-includes/media.php
- $rotate = false;
- if ( is_callable( 'exif_read_data' ) && in_array( $orig_type, apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) ) ) ) {
- $exif = @exif_read_data( $file, null, true );
- if ( $exif && isset( $exif['IFD0'] ) && is_array( $exif['IFD0'] ) && isset( $exif['IFD0']['Orientation'] ) ) {
- if ( 6 == $exif['IFD0']['Orientation'] )
- $rotate = 90;
- elseif ( 8 == $exif['IFD0']['Orientation'] )
- $rotate = 270;
- }
- }
- if ( $rotate )
- list($max_h,$max_w) = array($max_w,$max_h);
- $dims = bt_image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
- if ( !$dims )
- return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions') );
- list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
- $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );
- if ( $rotate )
- list($src_y,$src_x) = array($src_x,$src_y);
- imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
- // convert from full colors to index colors, like original PNG.
- if ( IMAGETYPE_PNG == $orig_type && function_exists('imageistruecolor') && !imageistruecolor( $image ) )
- imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) );
- // we don't need the original in memory anymore
- imagedestroy( $image );
- // $suffix will be appended to the destination filename, just before the extension
- if ( !$suffix ) {
- if ( $rotate )
- $suffix = "{$dst_h}x{$dst_w}";
- else
- $suffix = "{$dst_w}x{$dst_h}";
- }
- $info = pathinfo($file);
- $dir = $info['dirname'];
- $ext = $info['extension'];
- $name = wp_basename($file, ".$ext");
- if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
- $dir = $_dest_path;
- $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
- if ( IMAGETYPE_GIF == $orig_type ) {
- if ( !imagegif( $newimage, $destfilename ) )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- } elseif ( IMAGETYPE_PNG == $orig_type ) {
- if ( !imagepng( $newimage, $destfilename ) )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- } else {
- if ( $rotate ) {
- $newimage = _rotate_image_resource( $newimage, 360 - $rotate );
- }
- // all other formats are converted to jpg
- $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
- $return = imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) );
- if ( !$return )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
- imagedestroy( $newimage );
- // Set correct file permissions
- $stat = stat( dirname( $destfilename ));
- $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
- @ chmod( $destfilename, $perms );
- return $destfilename;
- }
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