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✏️ Editing: Wmf.php

<?php

namespace Mpdf\Image;

use Mpdf\Color\ColorConverter;
use Mpdf\Mpdf;

class Wmf
{

/**
	 * @var \Mpdf\Mpdf
	 */
	private $mpdf;

/**
	 * @var \Mpdf\Color\ColorConverter
	 */
	private $colorConverter;

/**
	 * @var array
	 */
	private $gdiObjectArray;

public function __construct(Mpdf $mpdf, ColorConverter $colorConverter)
	{
		$this->mpdf = $mpdf;
		$this->colorConverter = $colorConverter;
	}

function _getWMFimage($data)
	{
		$k = Mpdf::SCALE;

$this->gdiObjectArray = [];
		$a = unpack('stest', "\1\0");
		if ($a['test'] != 1) {
			return [0, 'Error parsing WMF image - Big-endian architecture not supported'];
		}
		// check for Aldus placeable metafile header
		$key = unpack('Lmagic', substr($data, 0, 4));
		$p = 18;  // WMF header
		if ($key['magic'] == (int) 0x9AC6CDD7) {
			$p +=22;
		} // Aldus header
		// define some state variables
		$wo = null; // window origin
		$we = null; // window extent
		$polyFillMode = 0;
		$nullPen = false;
		$nullBrush = false;
		$endRecord = false;
		$wmfdata = '';
		while ($p < strlen($data) && !$endRecord) {
			$recordInfo = unpack('Lsize/Sfunc', substr($data, $p, 6));
			$p += 6;
			// size of record given in WORDs (= 2 bytes)
			$size = $recordInfo['size'];
			// func is number of GDI function
			$func = $recordInfo['func'];
			if ($size > 3) {
				$parms = substr($data, $p, 2 * ($size - 3));
				$p += 2 * ($size - 3);
			}
			switch ($func) {
				case 0x020b:  // SetWindowOrg
					// do not allow window origin to be changed
					// after drawing has begun
					if (!$wmfdata) {
						$wo = array_reverse(unpack('s2', $parms));
					}
					break;
				case 0x020c:  // SetWindowExt
					// do not allow window extent to be changed
					// after drawing has begun
					if (!$wmfdata) {
						$we = array_reverse(unpack('s2', $parms));
					}
					break;
				case 0x02fc:  // CreateBrushIndirect
					$brush = unpack('sstyle/Cr/Cg/Cb/Ca/Shatch', $parms);
					$brush['type'] = 'B';
					$this->_AddGDIObject($brush);
					break;
				case 0x02fa:  // CreatePenIndirect
					$pen = unpack('Sstyle/swidth/sdummy/Cr/Cg/Cb/Ca', $parms);
					// convert width from twips to user unit
					$pen['width'] /= (20 * $k);
					$pen['type'] = 'P';
					$this->_AddGDIObject($pen);
					break;

// MUST create other GDI objects even if we don't handle them
				case 0x06fe: // CreateBitmap
				case 0x02fd: // CreateBitmapIndirect
				case 0x00f8: // CreateBrush
				case 0x02fb: // CreateFontIndirect
				case 0x00f7: // CreatePalette
				case 0x01f9: // CreatePatternBrush
				case 0x06ff: // CreateRegion
				case 0x0142: // DibCreatePatternBrush
					$dummyObject = ['type' => 'D'];
					$this->_AddGDIObject($dummyObject);
					break;
				case 0x0106:  // SetPolyFillMode
					$polyFillMode = unpack('smode', $parms);
					$polyFillMode = $polyFillMode['mode'];
					break;
				case 0x01f0:  // DeleteObject
					$idx = unpack('Sidx', $parms);
					$idx = $idx['idx'];
					$this->_DeleteGDIObject($idx);
					break;
				case 0x012d:  // SelectObject
					$idx = unpack('Sidx', $parms);
					$idx = $idx['idx'];
					$obj = $this->_GetGDIObject($idx);
					switch ($obj['type']) {
						case 'B':
							$nullBrush = false;
							if ($obj['style'] == 1) {
								$nullBrush = true;
							} else {
								$wmfdata .= $this->mpdf->SetFColor($this->colorConverter->convert('rgb(' . $obj['r'] . ',' . $obj['g'] . ',' . $obj['b'] . ')', $this->mpdf->PDFAXwarnings), true) . "\n";
							}
							break;
						case 'P':
							$nullPen = false;
							$dashArray = [];
							// dash parameters are custom
							switch ($obj['style']) {
								case 0: // PS_SOLID
									break;
								case 1: // PS_DASH
									$dashArray = [3, 1];
									break;
								case 2: // PS_DOT
									$dashArray = [0.5, 0.5];
									break;
								case 3: // PS_DASHDOT
									$dashArray = [2, 1, 0.5, 1];
									break;
								case 4: // PS_DASHDOTDOT
									$dashArray = [2, 1, 0.5, 1, 0.5, 1];
									break;
								case 5: // PS_NULL
									$nullPen = true;
									break;
							}
							if (!$nullPen) {
								$wmfdata .= $this->mpdf->SetDColor($this->colorConverter->convert('rgb(' . $obj['r'] . ',' . $obj['g'] . ',' . $obj['b'] . ')', $this->mpdf->PDFAXwarnings), true) . "\n";
								$wmfdata .= sprintf("%.3F w\n", $obj['width'] * $k);
							}
							if (!empty($dashArray)) {
								$s = '[';
								for ($i = 0; $i < count($dashArray); $i++) {
									$s .= $dashArray[$i] * $k;
									if ($i != count($dashArray) - 1) {
										$s .= ' ';
									}
								}
								$s .= '] 0 d';
								$wmfdata .= $s . "\n";
							}
							break;
					}
					break;
				case 0x0325: // Polyline
				case 0x0324: // Polygon
					$coords = unpack('s' . ($size - 3), $parms);
					$numpoints = $coords[1];
					for ($i = $numpoints; $i > 0; $i--) {
						$px = $coords[2 * $i];
						$py = $coords[2 * $i + 1];

if ($i < $numpoints) {
							$wmfdata .= $this->_LineTo($px, $py);
						} else {
							$wmfdata .= $this->_MoveTo($px, $py);
						}
					}
					if ($func == 0x0325) {
						$op = 's';
					} elseif ($func == 0x0324) {
						if ($nullPen) {
							if ($nullBrush) {
								$op = 'n';
							} // no op
							else {
								$op = 'f';
							} // fill
						} else {
							if ($nullBrush) {
								$op = 's';
							} // stroke
							else {
								$op = 'b';
							} // stroke and fill
						}
						if ($polyFillMode == 1 && ($op == 'b' || $op == 'f')) {
							$op .= '*';
						} // use even-odd fill rule
					}
					$wmfdata .= $op . "\n";
					break;
				case 0x0538: // PolyPolygon
					$coords = unpack('s' . ($size - 3), $parms);
					$numpolygons = $coords[1];
					$adjustment = $numpolygons;
					for ($j = 1; $j <= $numpolygons; $j++) {
						$numpoints = $coords[$j + 1];
						for ($i = $numpoints; $i > 0; $i--) {
							$px = $coords[2 * $i + $adjustment];
							$py = $coords[2 * $i + 1 + $adjustment];
							if ($i == $numpoints) {
								$wmfdata .= $this->_MoveTo($px, $py);
							} else {
								$wmfdata .= $this->_LineTo($px, $py);
							}
						}
						$adjustment += $numpoints * 2;
					}

if ($nullPen) {
						if ($nullBrush) {
							$op = 'n';
						} // no op
						else {
							$op = 'f';
						} // fill
					} else {
						if ($nullBrush) {
							$op = 's';
						} // stroke
						else {
							$op = 'b';
						} // stroke and fill
					}
					if ($polyFillMode == 1 && ($op == 'b' || $op == 'f')) {
						$op .= '*';
					} // use even-odd fill rule
					$wmfdata .= $op . "\n";
					break;
				case 0x0000:
					$endRecord = true;
					break;
			}
		}

return [1, $wmfdata, $wo, $we];
	}

function _MoveTo($x, $y)
	{
		return "$x $y m\n";
	}

// a line must have been started using _MoveTo() first
	function _LineTo($x, $y)
	{
		return "$x $y l\n";
	}

function _GetGDIObject($idx)
	{
		return $this->gdiObjectArray[$idx];
	}

function _DeleteGDIObject($idx)
	{
		unset($this->gdiObjectArray[$idx]);
	}
}

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