/usr/share/php/dompdf/include/font_metrics.cls.php is in php-dompdf 0.6.2+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Helmut Tischer <htischer@weihenstephan.org>
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
require_once DOMPDF_LIB_DIR . "/class.pdf.php";
/**
* Name of the font cache file
*
* This file must be writable by the webserver process only to update it
* with save_font_families() after adding the .afm file references of a new font family
* with Font_Metrics::save_font_families().
* This is typically done only from command line with load_font.php on converting
* ttf fonts to ufm with php-font-lib.
*
* Declared here because PHP5 prevents constants from being declared with expressions
*/
define('__DOMPDF_FONT_CACHE_FILE', DOMPDF_FONT_DIR . "dompdf_font_family_cache.php");
/**
* The font metrics class
*
* This class provides information about fonts and text. It can resolve
* font names into actual installed font files, as well as determine the
* size of text in a particular font and size.
*
* @static
* @package dompdf
*/
class Font_Metrics {
/**
* @see __DOMPDF_FONT_CACHE_FILE
*/
const CACHE_FILE = __DOMPDF_FONT_CACHE_FILE;
/**
* Underlying {@link Canvas} object to perform text size calculations
*
* @var Canvas
*/
static protected $_pdf = null;
/**
* Array of font family names to font files
*
* Usually cached by the {@link load_font.php} script
*
* @var array
*/
static protected $_font_lookup = array();
/**
* Class initialization
*
*/
static function init(Canvas $canvas = null) {
if (!self::$_pdf) {
if (!$canvas) {
$canvas = Canvas_Factory::get_instance(new DOMPDF());
}
self::$_pdf = $canvas;
}
}
/**
* Calculates text size, in points
*
* @param string $text the text to be sized
* @param string $font the desired font
* @param float $size the desired font size
* @param float $word_spacing
* @param float $char_spacing
*
* @internal param float $spacing word spacing, if any
* @return float
*/
static function get_text_width($text, $font, $size, $word_spacing = 0.0, $char_spacing = 0.0) {
//return self::$_pdf->get_text_width($text, $font, $size, $word_spacing, $char_spacing);
// @todo Make sure this cache is efficient before enabling it
static $cache = array();
if ( $text === "" ) {
return 0;
}
// Don't cache long strings
$use_cache = !isset($text[50]); // Faster than strlen
$key = "$font/$size/$word_spacing/$char_spacing";
if ( $use_cache && isset($cache[$key][$text]) ) {
return $cache[$key]["$text"];
}
$width = self::$_pdf->get_text_width($text, $font, $size, $word_spacing, $char_spacing);
if ( $use_cache ) {
$cache[$key][$text] = $width;
}
return $width;
}
/**
* Calculates font height
*
* @param string $font
* @param float $size
* @return float
*/
static function get_font_height($font, $size) {
return self::$_pdf->get_font_height($font, $size);
}
/**
* Resolves a font family & subtype into an actual font file
* Subtype can be one of 'normal', 'bold', 'italic' or 'bold_italic'. If
* the particular font family has no suitable font file, the default font
* ({@link DOMPDF_DEFAULT_FONT}) is used. The font file returned
* is the absolute pathname to the font file on the system.
*
* @param string $family_raw
* @param string $subtype_raw
*
* @return string
*/
static function get_font($family_raw, $subtype_raw = "normal") {
static $cache = array();
if ( isset($cache[$family_raw][$subtype_raw]) ) {
return $cache[$family_raw][$subtype_raw];
}
/* Allow calling for various fonts in search path. Therefore not immediately
* return replacement on non match.
* Only when called with NULL try replacement.
* When this is also missing there is really trouble.
* If only the subtype fails, nevertheless return failure.
* Only on checking the fallback font, check various subtypes on same font.
*/
$subtype = strtolower($subtype_raw);
if ( $family_raw ) {
$family = str_replace( array("'", '"'), "", strtolower($family_raw));
if ( isset(self::$_font_lookup[$family][$subtype]) ) {
return $cache[$family_raw][$subtype_raw] = self::$_font_lookup[$family][$subtype];
}
return null;
}
$family = "serif";
if ( isset(self::$_font_lookup[$family][$subtype]) ) {
return $cache[$family_raw][$subtype_raw] = self::$_font_lookup[$family][$subtype];
}
if ( !isset(self::$_font_lookup[$family]) ) {
return null;
}
$family = self::$_font_lookup[$family];
foreach ( $family as $sub => $font ) {
if (strpos($subtype, $sub) !== false) {
return $cache[$family_raw][$subtype_raw] = $font;
}
}
if ($subtype !== "normal") {
foreach ( $family as $sub => $font ) {
if ($sub !== "normal") {
return $cache[$family_raw][$subtype_raw] = $font;
}
}
}
$subtype = "normal";
if ( isset($family[$subtype]) ) {
return $cache[$family_raw][$subtype_raw] = $family[$subtype];
}
return null;
}
static function get_family($family) {
$family = str_replace( array("'", '"'), "", mb_strtolower($family));
if ( isset(self::$_font_lookup[$family]) ) {
return self::$_font_lookup[$family];
}
return null;
}
/**
* Saves the stored font family cache
*
* The name and location of the cache file are determined by {@link
* Font_Metrics::CACHE_FILE}. This file should be writable by the
* webserver process.
*
* @see Font_Metrics::load_font_families()
*/
static function save_font_families() {
// replace the path to the DOMPDF font directories with the corresponding constants (allows for more portability)
$cache_data = sprintf("<?php return array (%s", PHP_EOL);
foreach (self::$_font_lookup as $family => $variants) {
$cache_data .= sprintf(" '%s' => array(%s", addslashes($family), PHP_EOL);
foreach ($variants as $variant => $path) {
$path = sprintf("'%s'", $path);
$path = str_replace('\'' . DOMPDF_FONT_DIR , 'DOMPDF_FONT_DIR . \'' , $path);
$path = str_replace('\'' . DOMPDF_DIR , 'DOMPDF_DIR . \'' , $path);
$cache_data .= sprintf(" '%s' => %s,%s", $variant, $path, PHP_EOL);
}
$cache_data .= sprintf(" ),%s", PHP_EOL);
}
$cache_data .= ") ?>";
file_put_contents(self::CACHE_FILE, $cache_data);
}
/**
* Loads the stored font family cache
*
* @see save_font_families()
*/
static function load_font_families() {
$dist_fonts = require_once DOMPDF_DIR . "/lib/fonts/dompdf_font_family_cache.dist.php";
// FIXME: temporary step for font cache created before the font cache fix
if ( is_readable( DOMPDF_FONT_DIR . "dompdf_font_family_cache" ) ) {
$old_fonts = require_once DOMPDF_FONT_DIR . "dompdf_font_family_cache";
// If the font family cache is still in the old format
if ( $old_fonts === 1 ) {
$cache_data = file_get_contents(DOMPDF_FONT_DIR . "dompdf_font_family_cache");
file_put_contents(DOMPDF_FONT_DIR . "dompdf_font_family_cache", "<"."?php return $cache_data ?".">");
$old_fonts = require_once DOMPDF_FONT_DIR . "dompdf_font_family_cache";
}
$dist_fonts += $old_fonts;
}
if ( !is_readable(self::CACHE_FILE) ) {
self::$_font_lookup = $dist_fonts;
return;
}
$cache_data = require_once self::CACHE_FILE;
// If the font family cache is still in the old format
if ( self::$_font_lookup === 1 ) {
$cache_data = file_get_contents(self::CACHE_FILE);
file_put_contents(self::CACHE_FILE, "<"."?php return $cache_data ?".">");
$cache_data = require_once self::CACHE_FILE;
}
self::$_font_lookup = array();
foreach ($cache_data as $key => $value) {
self::$_font_lookup[stripslashes($key)] = $value;
}
// Merge provided fonts
self::$_font_lookup += $dist_fonts;
}
static function get_type($type) {
if (preg_match("/bold/i", $type)) {
if (preg_match("/italic|oblique/i", $type)) {
$type = "bold_italic";
}
else {
$type = "bold";
}
}
elseif (preg_match("/italic|oblique/i", $type)) {
$type = "italic";
}
else {
$type = "normal";
}
return $type;
}
static function install_fonts($files) {
$names = array();
foreach($files as $file) {
$font = Font::load($file);
$records = $font->getData("name", "records");
$type = self::get_type($records[2]);
$names[mb_strtolower($records[1])][$type] = $file;
}
return $names;
}
static function get_system_fonts() {
$files = glob("/usr/share/fonts/truetype/*.ttf") +
glob("/usr/share/fonts/truetype/*/*.ttf") +
glob("/usr/share/fonts/truetype/*/*/*.ttf") +
glob("C:\\Windows\\fonts\\*.ttf") +
glob("C:\\WinNT\\fonts\\*.ttf") +
glob("/mnt/c_drive/WINDOWS/Fonts/");
return self::install_fonts($files);
}
/**
* Returns the current font lookup table
*
* @return array
*/
static function get_font_families() {
return self::$_font_lookup;
}
static function set_font_family($fontname, $entry) {
self::$_font_lookup[mb_strtolower($fontname)] = $entry;
}
static function register_font($style, $remote_file, $context = null) {
$fontname = mb_strtolower($style["family"]);
$families = Font_Metrics::get_font_families();
$entry = array();
if ( isset($families[$fontname]) ) {
$entry = $families[$fontname];
}
$local_file = DOMPDF_FONT_DIR . md5($remote_file);
$local_temp_file = DOMPDF_TEMP_DIR . "/" . md5($remote_file);
$cache_entry = $local_file;
$local_file .= ".ttf";
$style_string = Font_Metrics::get_type("{$style['weight']} {$style['style']}");
if ( !isset($entry[$style_string]) ) {
$entry[$style_string] = $cache_entry;
// Download the remote file
file_put_contents($local_temp_file, file_get_contents($remote_file, null, $context));
$font = Font::load($local_temp_file);
if (!$font) {
unlink($local_temp_file);
return false;
}
$font->parse();
$font->saveAdobeFontMetrics("$cache_entry.ufm");
unlink($local_temp_file);
if ( !file_exists("$cache_entry.ufm") ) {
return false;
}
// Save the changes
file_put_contents($local_file, file_get_contents($remote_file, null, $context));
Font_Metrics::set_font_family($fontname, $entry);
Font_Metrics::save_font_families();
}
return true;
}
}
Font_Metrics::load_font_families();
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