X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/76aea3697c6043c1613370f172395b4f65ee71f0..2394dc71e94f8323dc422e89f9841959de78d328:/wp-includes/media.php
diff --git a/wp-includes/media.php b/wp-includes/media.php
index 36ca5958..5ec0338f 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1,9 +1,38 @@
0 )
+ $max_width = min( intval($content_width), $max_width );
+ } elseif ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) {
+ $max_width = intval( $_wp_additional_image_sizes[$size]['width'] );
+ $max_height = intval( $_wp_additional_image_sizes[$size]['height'] );
+ if ( intval($content_width) > 0 && is_admin() ) // Only in admin. Assume that theme authors know what they're doing.
+ $max_width = min( intval($content_width), $max_width );
+ }
+ // $size == 'full' has no constraint
+ else {
+ $max_width = $width;
+ $max_height = $height;
}
list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
@@ -39,7 +78,23 @@ function image_constrain_size_for_editor($width, $height, $size = 'medium') {
return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
}
-// return a width/height string for use in an tag. Empty values will be omitted.
+/**
+ * Retrieve width and height attributes using given width and height values.
+ *
+ * Both attributes are required in the sense that both parameters must have a
+ * value, but are optional in that if you set them to false or null, then they
+ * will not be added to the returned string.
+ *
+ * You can set the value using a string, but it will only take numeric values.
+ * If you wish to put 'px' after the numbers, then it will be stripped out of
+ * the return.
+ *
+ * @since 2.5.0
+ *
+ * @param int|string $width Optional. Width attribute value.
+ * @param int|string $height Optional. Height attribute value.
+ * @return string HTML attributes for width and, or height.
+ */
function image_hwstring($width, $height) {
$out = '';
if ($width)
@@ -49,9 +104,30 @@ function image_hwstring($width, $height) {
return $out;
}
-// Scale an image to fit a particular size (such as 'thumb' or 'medium'), and return an image URL, height and width.
-// The URL might be the original image, or it might be a resized version. This function won't create a new resized copy, it will just return an already resized one if it exists.
-// returns an array($url, $width, $height)
+/**
+ * Scale an image to fit a particular size (such as 'thumb' or 'medium').
+ *
+ * Array with image url, width, height, and whether is intermediate size, in
+ * that order is returned on success is returned. $is_intermediate is true if
+ * $url is a resized image, false if it is the original.
+ *
+ * The URL might be the original image, or it might be a resized version. This
+ * function won't create a new resized copy, it will just return an already
+ * resized one if it exists.
+ *
+ * A plugin may use the 'image_downsize' filter to hook into and offer image
+ * resizing services for images. The hook must return an array with the same
+ * elements that are returned in the function. The first element being the URL
+ * to the new image that was resized.
+ *
+ * @since 2.5.0
+ * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide
+ * resize services.
+ *
+ * @param int $id Attachment ID for image.
+ * @param array|string $size Optional, default is 'medium'. Size of image, either array or string.
+ * @return bool|array False on failure, array on success.
+ */
function image_downsize($id, $size = 'medium') {
if ( !wp_attachment_is_image($id) )
@@ -60,6 +136,8 @@ function image_downsize($id, $size = 'medium') {
$img_url = wp_get_attachment_url($id);
$meta = wp_get_attachment_metadata($id);
$width = $height = 0;
+ $is_intermediate = false;
+ $img_url_basename = wp_basename($img_url);
// plugins can use this to provide resize services
if ( $out = apply_filters('image_downsize', false, $id, $size) )
@@ -67,33 +145,68 @@ function image_downsize($id, $size = 'medium') {
// try for a new style intermediate size
if ( $intermediate = image_get_intermediate_size($id, $size) ) {
- $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
+ $img_url = str_replace($img_url_basename, $intermediate['file'], $img_url);
$width = $intermediate['width'];
$height = $intermediate['height'];
+ $is_intermediate = true;
}
elseif ( $size == 'thumbnail' ) {
// fall back to the old thumbnail
if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
- $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url);
+ $img_url = str_replace($img_url_basename, wp_basename($thumb_file), $img_url);
$width = $info[0];
$height = $info[1];
+ $is_intermediate = true;
}
}
if ( !$width && !$height && isset($meta['width'], $meta['height']) ) {
- // any other type: use the real image and constrain it
- list( $width, $height ) = image_constrain_size_for_editor( $meta['width'], $meta['height'], $size );
+ // any other type: use the real image
+ $width = $meta['width'];
+ $height = $meta['height'];
}
- if ( $img_url)
- return array( $img_url, $width, $height );
+ if ( $img_url) {
+ // we have the actual image size, but might need to further constrain it if content_width is narrower
+ list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
+
+ return array( $img_url, $width, $height, $is_intermediate );
+ }
return false;
}
+/**
+ * Registers a new image size
+ *
+ * @since 2.9.0
+ */
+function 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' => (bool) $crop );
+}
+
+/**
+ * Registers an image size for the post thumbnail
+ *
+ * @since 2.9.0
+ */
+function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
+ add_image_size( 'post-thumbnail', $width, $height, $crop );
+}
+
/**
* An
tag for an image attachment, scaling it down if requested.
*
- * {@internal Missing Long Description}}
+ * The filter 'get_image_tag_class' allows for changing the class name for the
+ * image without having to use regular expressions on the HTML content. The
+ * parameters are: what WordPress will use for the class, the Attachment ID,
+ * image align value, and the size the image should be.
+ *
+ * The second filter 'get_image_tag' has the HTML content, which can then be
+ * further manipulated by a plugin to change all attribute values and even HTML
+ * content.
+ *
+ * @since 2.5.0
*
* @uses apply_filters() The 'get_image_tag_class' filter is the IMG element
* class attribute.
@@ -112,39 +225,117 @@ function get_image_tag($id, $alt, $title, $align, $size='medium') {
list( $img_src, $width, $height ) = image_downsize($id, $size);
$hwstring = image_hwstring($width, $height);
- $class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id;
+ $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
$class = apply_filters('get_image_tag_class', $class, $id, $align, $size);
- $html = '
';
+ $html = '
';
$html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
return $html;
}
-// same as wp_shrink_dimensions, except the max parameters are optional.
-// if either width or height are empty, no constraint is applied on that dimension.
+/**
+ * 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', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) );
+ $image = imagecreatefromstring( file_get_contents( $file ) );
+
+ if ( !is_resource( $image ) )
+ return sprintf(__('File “%s” is not an image.'), $file);
+
+ return $image;
+}
+
+/**
+ * Calculates the new dimensions for a downsampled image.
+ *
+ * If either width or height are empty, no constraint is applied on
+ * that dimension.
+ *
+ * @since 2.5.0
+ *
+ * @param int $current_width Current width of the image.
+ * @param int $current_height Current height of the image.
+ * @param int $max_width Optional. Maximum wanted width.
+ * @param int $max_height Optional. Maximum wanted height.
+ * @return array First item is the width, the second item is the height.
+ */
function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
if ( !$max_width and !$max_height )
return array( $current_width, $current_height );
$width_ratio = $height_ratio = 1.0;
+ $did_width = $did_height = false;
- if ( $max_width > 0 && $current_width > $max_width )
+ if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) {
$width_ratio = $max_width / $current_width;
+ $did_width = true;
+ }
- if ( $max_height > 0 && $current_height > $max_height )
+ if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) {
$height_ratio = $max_height / $current_height;
+ $did_height = true;
+ }
- // the smaller ratio is the one we need to fit it to the constraining box
- $ratio = min( $width_ratio, $height_ratio );
-
- return array( intval($current_width * $ratio), intval($current_height * $ratio) );
+ // Calculate the larger/smaller ratios
+ $smaller_ratio = min( $width_ratio, $height_ratio );
+ $larger_ratio = max( $width_ratio, $height_ratio );
+
+ if ( intval( $current_width * $larger_ratio ) > $max_width || intval( $current_height * $larger_ratio ) > $max_height )
+ // The larger ratio is too big. It would result in an overflow.
+ $ratio = $smaller_ratio;
+ else
+ // The larger ratio fits, and is likely to be a more "snug" fit.
+ $ratio = $larger_ratio;
+
+ $w = intval( $current_width * $ratio );
+ $h = intval( $current_height * $ratio );
+
+ // Sometimes, due to rounding, we'll end up with a result like this: 465x700 in a 177x177 box is 117x176... a pixel short
+ // We also have issues with recursive calls resulting in an ever-changing result. Constraining to the result of a constraint should yield the original result.
+ // Thus we look for dimensions that are one pixel shy of the max value and bump them up
+ if ( $did_width && $w == $max_width - 1 )
+ $w = $max_width; // Round it up
+ if ( $did_height && $h == $max_height - 1 )
+ $h = $max_height; // Round it up
+
+ return array( $w, $h );
}
-// calculate dimensions and coordinates for a resized image that fits within a specified width and height
-// if $crop is true, the largest matching central portion of the image will be cropped out and resized to the required size
-function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=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.
+ *
+ * @since 2.5.0
+ *
+ * @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 $crop Optional, default is false. Whether to crop image or resize.
+ * @return bool|array False on failure. Returned array matches parameters for imagecopyresampled() PHP function.
+ */
+function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {
if ($orig_w <= 0 || $orig_h <= 0)
return false;
@@ -157,22 +348,23 @@ function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false
$aspect_ratio = $orig_w / $orig_h;
$new_w = min($dest_w, $orig_w);
$new_h = min($dest_h, $orig_h);
- if (!$new_w) {
+
+ if ( !$new_w ) {
$new_w = intval($new_h * $aspect_ratio);
}
- if (!$new_h) {
+
+ if ( !$new_h ) {
$new_h = intval($new_w / $aspect_ratio);
}
$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
- $crop_w = ceil($new_w / $size_ratio);
- $crop_h = ceil($new_h / $size_ratio);
+ $crop_w = round($new_w / $size_ratio);
+ $crop_h = round($new_h / $size_ratio);
- $s_x = floor(($orig_w - $crop_w)/2);
- $s_y = floor(($orig_h - $crop_h)/2);
- }
- else {
+ $s_x = floor( ($orig_w - $crop_w) / 2 );
+ $s_y = floor( ($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 = $orig_h;
@@ -184,38 +376,61 @@ function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false
}
// if the resulting image would be the same size or larger we don't want to resize it
- if ($new_w >= $orig_w && $new_h >= $orig_h)
+ 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, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_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
-function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=90) {
+/**
+ * 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 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);
+ 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) = $size;
- list($orig_w, $orig_h, $orig_type) = getimagesize( $file );
$dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
- if (!$dims)
- return $dims;
+ if ( !$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 = imagecreatetruecolor( $dst_w, $dst_h);
-
- // preserve PNG transparency
- if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
- imagealphablending( $newimage, false);
- imagesavealpha( $newimage, true);
- }
+ $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );
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 );
@@ -226,23 +441,22 @@ function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_p
$info = pathinfo($file);
$dir = $info['dirname'];
$ext = $info['extension'];
- $name = basename($file, ".{$ext}");
+ $name = wp_basename($file, ".$ext");
+
if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
$dir = $_dest_path;
$destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
- if ( $orig_type == IMAGETYPE_GIF ) {
- if (!imagegif( $newimage, $destfilename ) )
+ if ( IMAGETYPE_GIF == $orig_type ) {
+ if ( !imagegif( $newimage, $destfilename ) )
return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
- elseif ( $orig_type == IMAGETYPE_PNG ) {
- if (!imagepng( $newimage, $destfilename ) )
+ } elseif ( IMAGETYPE_PNG == $orig_type ) {
+ if ( !imagepng( $newimage, $destfilename ) )
return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
- else {
+ } else {
// all other formats are converted to jpg
$destfilename = "{$dir}/{$name}-{$suffix}.jpg";
- if (!imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality ) ) )
+ if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )
return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
}
@@ -256,15 +470,28 @@ function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_p
return $destfilename;
}
-// resize an image to make a thumbnail or intermediate size, and return metadata describing the new copy
-// returns false if no image was created
+/**
+ * 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.
+ *
+ * @since 2.5.0
+ *
+ * @param string $file File path.
+ * @param int $width Image width.
+ * @param int $height Image height.
+ * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
+ * @return bool|array False, if no image was created. Metadata array on success.
+ */
function image_make_intermediate_size($file, $width, $height, $crop=false) {
if ( $width || $height ) {
$resized_file = image_resize($file, $width, $height, $crop);
if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {
$resized_file = apply_filters('image_make_intermediate_size', $resized_file);
return array(
- 'file' => basename( $resized_file ),
+ 'file' => wp_basename( $resized_file ),
'width' => $info[0],
'height' => $info[1],
);
@@ -273,6 +500,32 @@ function image_make_intermediate_size($file, $width, $height, $crop=false) {
return false;
}
+/**
+ * Retrieve the image's intermediate size (resized) path, width, and height.
+ *
+ * The $size parameter can be an array with the width and height respectively.
+ * If the size matches the 'sizes' metadata array for width and height, then it
+ * will be used. If there is no direct match, then the nearest image size larger
+ * than the specified size will be used. If nothing is found, then the function
+ * will break out and return false.
+ *
+ * The metadata 'sizes' is used for compatible sizes that can be used for the
+ * parameter $size value.
+ *
+ * The url path will be given, when the $size parameter is a string.
+ *
+ * If you are passing an array for the $size, you should consider using
+ * add_image_size() so that a cropped version is generated. It's much more
+ * efficient than having to find the closest-sized image and then having the
+ * browser scale down the image.
+ *
+ * @since 2.5.0
+ * @see add_image_size()
+ *
+ * @param int $post_id Attachment ID for image.
+ * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
+ * @return bool|array False on failure or array of file path, width, and height on success.
+ */
function image_get_intermediate_size($post_id, $size='thumbnail') {
if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
return false;
@@ -295,6 +548,13 @@ function image_get_intermediate_size($post_id, $size='thumbnail') {
foreach ( $areas as $_size ) {
$data = $imagedata['sizes'][$_size];
if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
+ // Skip images with unexpectedly divergent aspect ratios (crops)
+ // First, we calculate what size the original image would be if constrained to a box the size of the current image in the loop
+ $maybe_cropped = image_resize_dimensions($imagedata['width'], $imagedata['height'], $data['width'], $data['height'], false );
+ // If the size doesn't match within one pixel, then it is of a different aspect ratio, so we skip it, unless it's the thumbnail size
+ if ( 'thumbnail' != $_size && ( !$maybe_cropped || ( $maybe_cropped[4] != $data['width'] && $maybe_cropped[4] + 1 != $data['width'] ) || ( $maybe_cropped[5] != $data['height'] && $maybe_cropped[5] + 1 != $data['height'] ) ) )
+ continue;
+ // If we're still here, then we're going to use this size
$file = $data['file'];
list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
return compact( 'file', 'width', 'height' );
@@ -305,7 +565,7 @@ function image_get_intermediate_size($post_id, $size='thumbnail') {
if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
return false;
-
+
$data = $imagedata['sizes'][$size];
// include the full filesystem path of the intermediate file
if ( empty($data['path']) && !empty($data['file']) ) {
@@ -316,17 +576,43 @@ function image_get_intermediate_size($post_id, $size='thumbnail') {
return $data;
}
-// get an image to represent an attachment - a mime icon for files, thumbnail or intermediate size for images
-// returns an array (url, width, height), or false if no image is available
+/**
+ * Get the available image sizes
+ * @since 3.0.0
+ * @return array Returns a filtered array of image size strings
+ */
+function get_intermediate_image_sizes() {
+ global $_wp_additional_image_sizes;
+ $image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes
+ if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )
+ $image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );
+
+ return apply_filters( 'intermediate_image_sizes', $image_sizes );
+}
+
+/**
+ * Retrieve an image to represent an attachment.
+ *
+ * A mime icon for files, thumbnail or intermediate size for images.
+ *
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return bool|array Returns an array (url, width, height), or false, if no image is available.
+ */
function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
-
+
// get a thumbnail or intermediate image if there is one
if ( $image = image_downsize($attachment_id, $size) )
return $image;
+ $src = false;
+
if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
- $icon_dir = apply_filters( 'icon_dir', includes_url('images/crystal') );
- $src_file = $icon_dir . '/' . basename($src);
+ $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
+ $src_file = $icon_dir . '/' . wp_basename($src);
@list($width, $height) = getimagesize($src_file);
}
if ( $src && $width && $height )
@@ -334,8 +620,25 @@ function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon =
return false;
}
-// as per wp_get_attachment_image_src, but returns an
tag
-function wp_get_attachment_image($attachment_id, $size='thumbnail', $icon = false) {
+/**
+ * Get an HTML img element representing an image attachment
+ *
+ * While $size will accept an array, it is better to register a size with
+ * add_image_size() so that a cropped version is generated. It's much more
+ * efficient than having to find the closest-sized image and then having the
+ * browser scale down the image.
+ *
+ * @see add_image_size()
+ * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array
+ * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return string HTML img element or empty string on failure.
+ */
+function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {
$html = '';
$image = wp_get_attachment_image_src($attachment_id, $size, $icon);
@@ -344,15 +647,82 @@ function wp_get_attachment_image($attachment_id, $size='thumbnail', $icon = fals
$hwstring = image_hwstring($width, $height);
if ( is_array($size) )
$size = join('x', $size);
- $html = '
';
+ $attachment =& get_post($attachment_id);
+ $default_attr = array(
+ 'src' => $src,
+ 'class' => "attachment-$size",
+ 'alt' => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first
+ 'title' => trim(strip_tags( $attachment->post_title )),
+ );
+ if ( empty($default_attr['alt']) )
+ $default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption
+ if ( empty($default_attr['alt']) )
+ $default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title
+
+ $attr = wp_parse_args($attr, $default_attr);
+ $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
+ $attr = array_map( 'esc_attr', $attr );
+ $html = rtrim("
$value ) {
+ $html .= " $name=" . '"' . $value . '"';
+ }
+ $html .= ' />';
}
-
+
return $html;
}
+/**
+ * Adds a 'wp-post-image' class to post thumbnails
+ * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to
+ * dynamically add/remove itself so as to only filter post thumbnails
+ *
+ * @since 2.9.0
+ * @param array $attr Attributes including src, class, alt, title
+ * @return array
+ */
+function _wp_post_thumbnail_class_filter( $attr ) {
+ $attr['class'] .= ' wp-post-image';
+ return $attr;
+}
+
+/**
+ * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter
+ *
+ * @since 2.9.0
+ */
+function _wp_post_thumbnail_class_filter_add( $attr ) {
+ add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
+}
+
+/**
+ * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter
+ *
+ * @since 2.9.0
+ */
+function _wp_post_thumbnail_class_filter_remove( $attr ) {
+ remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
+}
+
add_shortcode('wp_caption', 'img_caption_shortcode');
add_shortcode('caption', 'img_caption_shortcode');
+/**
+ * The Caption shortcode.
+ *
+ * Allows a plugin to replace the content that would otherwise be returned. The
+ * filter is 'img_caption_shortcode' and passes an empty string, the attr
+ * parameter and the content parameter values.
+ *
+ * The supported attributes for the shortcode are 'id', 'align', 'width', and
+ * 'caption'.
+ *
+ * @since 2.6.0
+ *
+ * @param array $attr Attributes attributed to the shortcode.
+ * @param string $content Optional. Shortcode content.
+ * @return string
+ */
function img_caption_shortcode($attr, $content = null) {
// Allow plugins/themes to override the default caption template.
@@ -366,21 +736,35 @@ function img_caption_shortcode($attr, $content = null) {
'width' => '',
'caption' => ''
), $attr));
-
+
if ( 1 > (int) $width || empty($caption) )
return $content;
-
- if ( $id ) $id = 'id="' . $id . '" ';
-
- return '
' . $caption . '
' . $caption . '