Wmf.php
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<?php
/*
PHPRtfLite
Copyright 2007-2008 Denis Slaveckij <sinedas@gmail.com>
Copyright 2010-2012 Steffen Zeidler <sigma_z@sigma-scripts.de>
This file is part of PHPRtfLite.
PHPRtfLite is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PHPRtfLite is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PHPRtfLite. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Class for displaying wmf images in rtf documents.
* @since 1.2
* @version 1.2
* @author Steffen Zeidler <sigma_z@sigma-scripts.de>
* @copyright 2010-2012 Steffen Zeidler
* @package PHPRtfLite
* @subpackage PHPRtfLite_Image
*/
class PHPRtfLite_Image_Wmf extends PHPRtfLite_Image
{
/**
* true, if Aldus header has been found in wmf image
* @var boolean
*/
private $_headerStartBytesFound = false;
/**
* constructor
*
* @param PHPRtfLite $rtf
* @param resource $stream
* @param float $width optional
* @param float $height optional
*/
public function __construct(PHPRtfLite $rtf, $stream, $width = null, $height = null)
{
parent::__construct($rtf, $stream, $width, $height);
$this->_imageRtfType = '\wmetafile8';
$this->setImageDimension();
}
/**
* code for parsing the wmf is originally from: http://www.fpdf.de/downloads/addons/55/
* as an addon for FPDF, written by Martin HALL-MAY
*/
private function setImageDimension()
{
$headerSize = $this->getHeaderSize();
fseek($this->_stream, $headerSize);
while (!feof($this->_stream)) {
$recordInfo = unpack('Lsize/Sfunc', fread($this->_stream, 6));
// size of record given in WORDs (= 2 bytes)
$size = $recordInfo['size'];
// func is number of GDI function
$func = $recordInfo['func'];
// parameters are read as one block and processed
// as necessary by the case statement below.
// the data are stored in little-endian format and are unpacked using:
// s - signed 16-bit int
// S - unsigned 16-bit int (or WORD)
// L - unsigned 32-bit int (or DWORD)
// NB. parameters to GDI functions are stored in reverse order
// however structures are not reversed,
// e.g. POINT { int x, int y } where x=3000 (0x0BB8) and y=-1200 (0xFB50)
// is stored as B8 0B 50 FB
if ($size > 3) {
$params = fread($this->_stream, 2 * ($size - 3));
}
switch ($func) {
case 0x020c: // SetWindowExt
$sizes = array_reverse(unpack('s2', $params));
$this->setImageWidth(PHPRtfLite_Unit::getPointsInTwips($sizes[0]));
$this->setImageHeight(PHPRtfLite_Unit::getPointsInTwips($sizes[1]));
return;
case 0x0000:
return;
}
}
}
/**
* Get header size of wmf.
*
* @return integer $headerSize
*/
private function getHeaderSize()
{
// reset stream pointer to 0
fseek($this->_stream, 0);
// check for Aldus placeable metafile header
// L: vorzeichenloser Long-Typ (immer 32 Bit, Byte-Folge maschinenabhängig)
// magic:
$magic = fread($this->_stream, 4);
$headerSize = 18; // WMF header minus four bytes already read
if ($magic == "\xd7\xcd\xc6\x9a") {
$this->_headerStartBytesFound = true;
$headerSize += 22; // Aldus header
}
return $headerSize;
}
/**
* gets rtf code of wmf
*
* @return string rtf code
*/
public function render()
{
$startFrom = $this->_headerStartBytesFound ? 22 : 0;
$this->writeIntoRtfStream($startFrom);
}
}