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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Font.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Zend_Pdf_Resource */
require_once 'Zend/Pdf/Resource.php';
/**
* Zend_Pdf_Font
*
* Zend_Pdf_Font class constants are used within Zend_Pdf_Resource_Font
* and its subclusses.
*/
require_once 'Zend/Pdf/Font.php';
/**
* Abstract class which manages PDF fonts.
*
* Defines the public interface and creates shared storage for concrete
* subclasses which are responsible for generating the font's information
* dictionaries, mapping characters to glyphs, and providing both overall font
* and glyph-specific metric data.
*
* Font objects should be normally be obtained from the factory methods
* {@link Zend_Pdf_Font::fontWithName} and {@link Zend_Pdf_Font::fontWithPath}.
*
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
abstract class Zend_Pdf_Resource_Font extends Zend_Pdf_Resource
{
/**** Instance Variables ****/
/**
* The type of font. Use TYPE_ constants defined in {@link Zend_Pdf_Font}.
* @var integer
*/
protected $_fontType = Zend_Pdf_Font::TYPE_UNKNOWN;
/**
* Array containing descriptive names for the font. See {@link fontName()}.
* @var array
*/
protected $_fontNames = array();
/**
* Flag indicating whether or not this font is bold.
* @var boolean
*/
protected $_isBold = false;
/**
* Flag indicating whether or not this font is italic.
* @var boolean
*/
protected $_isItalic = false;
/**
* Flag indicating whether or not this font is monospaced.
* @var boolean
*/
protected $_isMonospace = false;
/**
* The position below the text baseline of the underline (in glyph units).
* @var integer
*/
protected $_underlinePosition = 0;
/**
* The thickness of the underline (in glyph units).
* @var integer
*/
protected $_underlineThickness = 0;
/**
* The position above the text baseline of the strikethrough (in glyph units).
* @var integer
*/
protected $_strikePosition = 0;
/**
* The thickness of the strikethrough (in glyph units).
* @var integer
*/
protected $_strikeThickness = 0;
/**
* Number of glyph units per em. See {@link getUnitsPerEm()}.
* @var integer
*/
protected $_unitsPerEm = 0;
/**
* Typographical ascent. See {@link getAscent()}.
* @var integer
*/
protected $_ascent = 0;
/**
* Typographical descent. See {@link getDescent()}.
* @var integer
*/
protected $_descent = 0;
/**
* Typographical line gap. See {@link getLineGap()}.
* @var integer
*/
protected $_lineGap = 0;
/**** Public Interface ****/
/* Object Lifecycle */
/**
* Object constructor.
*
*/
public function __construct()
{
parent::__construct(new Zend_Pdf_Element_Dictionary());
$this->_resource->Type = new Zend_Pdf_Element_Name('Font');
}
/* Object Magic Methods */
/**
* Returns the full name of the font in the encoding method of the current
* locale. Transliterates any characters that cannot be naturally
* represented in that character set.
*
* @return string
*/
public function __toString()
{
return $this->getFontName(Zend_Pdf_Font::NAME_FULL, '', '//TRANSLIT');
}
/* Accessors */
/**
* Returns the type of font.
*
* @return integer One of the TYPE_ constants defined in
* {@link Zend_Pdf_Font}.
*/
public function getFontType()
{
return $this->_fontType;
}
/**
* Returns the specified descriptive name for the font.
*
* The font name type is usually one of the following:
* <ul>
* <li>{@link Zend_Pdf_Font::NAME_FULL}
* <li>{@link Zend_Pdf_Font::NAME_FAMILY}
* <li>{@link Zend_Pdf_Font::NAME_PREFERRED_FAMILY}
* <li>{@link Zend_Pdf_Font::NAME_STYLE}
* <li>{@link Zend_Pdf_Font::NAME_PREFERRED_STYLE}
* <li>{@link Zend_Pdf_Font::NAME_DESCRIPTION}
* <li>{@link Zend_Pdf_Font::NAME_SAMPLE_TEXT}
* <li>{@link Zend_Pdf_Font::NAME_ID}
* <li>{@link Zend_Pdf_Font::NAME_VERSION}
* <li>{@link Zend_Pdf_Font::NAME_POSTSCRIPT}
* <li>{@link Zend_Pdf_Font::NAME_CID_NAME}
* <li>{@link Zend_Pdf_Font::NAME_DESIGNER}
* <li>{@link Zend_Pdf_Font::NAME_DESIGNER_URL}
* <li>{@link Zend_Pdf_Font::NAME_MANUFACTURER}
* <li>{@link Zend_Pdf_Font::NAME_VENDOR_URL}
* <li>{@link Zend_Pdf_Font::NAME_COPYRIGHT}
* <li>{@link Zend_Pdf_Font::NAME_TRADEMARK}
* <li>{@link Zend_Pdf_Font::NAME_LICENSE}
* <li>{@link Zend_Pdf_Font::NAME_LICENSE_URL}
* </ul>
*
* Note that not all names are available for all fonts. In addition, some
* fonts may contain additional names, whose indicies are in the range
* 256 to 32767 inclusive, which are used for certain font layout features.
*
* If the preferred language translation is not available, uses the first
* available translation for the name, which is usually English.
*
* If the requested name does not exist, returns null.
*
* All names are stored internally as Unicode strings, using UTF-16BE
* encoding. You may optionally supply a different resulting character set.
*
* @param integer $nameType Type of name requested.
* @param mixed $language Preferred language (string) or array of languages
* in preferred order. Use the ISO 639 standard 2-letter language codes.
* @param string $characterSet (optional) Desired resulting character set.
* You may use any character set supported by {@link iconv()};
* @return string
*/
public function getFontName($nameType, $language, $characterSet = null)
{
if (! isset($this->_fontNames[$nameType])) {
return null;
}
$name = null;
if (is_array($language)) {
foreach ($language as $code) {
if (isset($this->_fontNames[$nameType][$code])) {
$name = $this->_fontNames[$nameType][$code];
break;
}
}
} else {
if (isset($this->_fontNames[$nameType][$language])) {
$name = $this->_fontNames[$nameType][$language];
}
}
/* If the preferred language could not be found, use whatever is first.
*/
if ($name === null) {
$names = $this->_fontNames[$nameType];
$name = reset($names);
}
/* Convert the character set if requested.
*/
if (($characterSet !== null) && ($characterSet != 'UTF-16BE') && PHP_OS != 'AIX') { // AIX knows not this charset
$name = iconv('UTF-16BE', $characterSet, $name);
}
return $name;
}
/**
* Returns whole set of font names.
*
* @return array
*/
public function getFontNames()
{
return $this->_fontNames;
}
/**
* Returns true if font is bold.
*
* @return boolean
*/
public function isBold()
{
return $this->_isBold;
}
/**
* Returns true if font is italic.
*
* @return boolean
*/
public function isItalic()
{
return $this->_isItalic;
}
/**
* Returns true if font is monospace.
*
* @return boolean
*/
public function isMonospace()
{
return $this->_isMonospace;
}
/**
* Returns the suggested position below the text baseline of the underline
* in glyph units.
*
* This value is usually negative.
*
* @return integer
*/
public function getUnderlinePosition()
{
return $this->_underlinePosition;
}
/**
* Returns the suggested line thickness of the underline in glyph units.
*
* @return integer
*/
public function getUnderlineThickness()
{
return $this->_underlineThickness;
}
/**
* Returns the suggested position above the text baseline of the
* strikethrough in glyph units.
*
* @return integer
*/
public function getStrikePosition()
{
return $this->_strikePosition;
}
/**
* Returns the suggested line thickness of the strikethrough in glyph units.
*
* @return integer
*/
public function getStrikeThickness()
{
return $this->_strikeThickness;
}
/**
* Returns the number of glyph units per em.
*
* Used to convert glyph space to user space. Frequently used in conjunction
* with {@link widthsForGlyphs()} to calculate the with of a run of text.
*
* @return integer
*/
public function getUnitsPerEm()
{
return $this->_unitsPerEm;
}
/**
* Returns the typographic ascent in font glyph units.
*
* The typographic ascent is the distance from the font's baseline to the
* top of the text frame. It is frequently used to locate the initial
* baseline for a paragraph of text inside a given rectangle.
*
* @return integer
*/
public function getAscent()
{
return $this->_ascent;
}
/**
* Returns the typographic descent in font glyph units.
*
* The typographic descent is the distance below the font's baseline to the
* bottom of the text frame. It is always negative.
*
* @return integer
*/
public function getDescent()
{
return $this->_descent;
}
/**
* Returns the typographic line gap in font glyph units.
*
* The typographic line gap is the distance between the bottom of the text
* frame of one line to the top of the text frame of the next. It is
* typically combined with the typographical ascent and descent to determine
* the font's total line height (or leading).
*
* @return integer
*/
public function getLineGap()
{
return $this->_lineGap;
}
/**
* Returns the suggested line height (or leading) in font glyph units.
*
* This value is determined by adding together the values of the typographic
* ascent, descent, and line gap. This value yields the suggested line
* spacing as determined by the font developer.
*
* It should be noted that this is only a guideline; layout engines will
* frequently modify this value to achieve special effects such as double-
* spacing.
*
* @return integer
*/
public function getLineHeight()
{
return $this->_ascent - $this->_descent + $this->_lineGap;
}
/* Information and Conversion Methods */
/**
* Returns an array of glyph numbers corresponding to the Unicode characters.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumberForCharacter()}.
*
* @param array $characterCodes Array of Unicode character codes (code points).
* @return array Array of glyph numbers.
*/
abstract public function glyphNumbersForCharacters($characterCodes);
/**
* Returns the glyph number corresponding to the Unicode character.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumbersForCharacters()} which is optimized for bulk
* operations.
*
* @param integer $characterCode Unicode character code (code point).
* @return integer Glyph number.
*/
abstract public function glyphNumberForCharacter($characterCode);
/**
* Returns a number between 0 and 1 inclusive that indicates the percentage
* of characters in the string which are covered by glyphs in this font.
*
* Since no one font will contain glyphs for the entire Unicode character
* range, this method can be used to help locate a suitable font when the
* actual contents of the string are not known.
*
* Note that some fonts lie about the characters they support. Additionally,
* fonts don't usually contain glyphs for control characters such as tabs
* and line breaks, so it is rare that you will get back a full 1.0 score.
* The resulting value should be considered informational only.
*
* @param string $string
* @param string $charEncoding (optional) Character encoding of source text.
* If omitted, uses 'current locale'.
* @return float
*/
abstract public function getCoveredPercentage($string, $charEncoding = '');
/**
* Returns the widths of the glyphs.
*
* The widths are expressed in the font's glyph space. You are responsible
* for converting to user space as necessary. See {@link unitsPerEm()}.
*
* See also {@link widthForGlyph()}.
*
* @param array $glyphNumbers Array of glyph numbers.
* @return array Array of glyph widths (integers).
* @throws Zend_Pdf_Exception
*/
abstract public function widthsForGlyphs($glyphNumbers);
/**
* Returns the width of the glyph.
*
* Like {@link widthsForGlyphs()} but used for one glyph at a time.
*
* @param integer $glyphNumber
* @return integer
* @throws Zend_Pdf_Exception
*/
abstract public function widthForGlyph($glyphNumber);
/**
* Convert string to the font encoding.
*
* The method is used to prepare string for text drawing operators
*
* @param string $string
* @param string $charEncoding Character encoding of source text.
* @return string
*/
abstract public function encodeString($string, $charEncoding);
/**
* Convert string from the font encoding.
*
* The method is used to convert strings retrieved from existing content streams
*
* @param string $string
* @param string $charEncoding Character encoding of resulting text.
* @return string
*/
abstract public function decodeString($string, $charEncoding);
/**** Internal Methods ****/
/**
* If the font's glyph space is not 1000 units per em, converts the value.
*
* @internal
* @param integer $value
* @return integer
*/
public function toEmSpace($value)
{
if ($this->_unitsPerEm == 1000) {
return $value;
}
return ceil(($value / $this->_unitsPerEm) * 1000); // always round up
}
}
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