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   1  <?php
   2  //============================================================+
   3  // File name   : tcpdf_images.php
   4  // Version     : 1.0.005
   5  // Begin       : 2002-08-03
   6  // Last Update : 2014-11-15
   7  // Author      : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
   8  // License     : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
   9  // -------------------------------------------------------------------
  10  // Copyright (C) 2002-2014 Nicola Asuni - Tecnick.com LTD
  11  //
  12  // This file is part of TCPDF software library.
  13  //
  14  // TCPDF is free software: you can redistribute it and/or modify it
  15  // under the terms of the GNU Lesser General Public License as
  16  // published by the Free Software Foundation, either version 3 of the
  17  // License, or (at your option) any later version.
  18  //
  19  // TCPDF is distributed in the hope that it will be useful, but
  20  // WITHOUT ANY WARRANTY; without even the implied warranty of
  21  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  22  // See the GNU Lesser General Public License for more details.
  23  //
  24  // You should have received a copy of the License
  25  // along with TCPDF. If not, see
  26  // <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
  27  //
  28  // See LICENSE.TXT file for more information.
  29  // -------------------------------------------------------------------
  30  //
  31  // Description :
  32  //   Static image methods used by the TCPDF class.
  33  //
  34  //============================================================+
  35  
  36  /**
  37   * @file
  38   * This is a PHP class that contains static image methods for the TCPDF class.<br>
  39   * @package com.tecnick.tcpdf
  40   * @author Nicola Asuni
  41   * @version 1.0.005
  42   */
  43  
  44  /**
  45   * @class TCPDF_IMAGES
  46   * Static image methods used by the TCPDF class.
  47   * @package com.tecnick.tcpdf
  48   * @brief PHP class for generating PDF documents without requiring external extensions.
  49   * @version 1.0.005
  50   * @author Nicola Asuni - info@tecnick.com
  51   */
  52  class TCPDF_IMAGES {
  53  
  54      /**
  55       * Array of hinheritable SVG properties.
  56       * @since 5.0.000 (2010-05-02)
  57       * @public static
  58       */
  59      public static $svginheritprop = array('clip-rule', 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile', 'color-rendering', 'cursor', 'direction', 'display', 'fill', 'fill-opacity', 'fill-rule', 'font', 'font-family', 'font-size', 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'glyph-orientation-horizontal', 'glyph-orientation-vertical', 'image-rendering', 'kerning', 'letter-spacing', 'marker', 'marker-end', 'marker-mid', 'marker-start', 'pointer-events', 'shape-rendering', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'text-anchor', 'text-rendering', 'visibility', 'word-spacing', 'writing-mode');
  60  
  61  // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  62  
  63      /**
  64       * Return the image type given the file name or array returned by getimagesize() function.
  65       * @param $imgfile (string) image file name
  66       * @param $iminfo (array) array of image information returned by getimagesize() function.
  67       * @return string image type
  68       * @since 4.8.017 (2009-11-27)
  69       * @public static
  70       */
  71  	public static function getImageFileType($imgfile, $iminfo=array()) {
  72          $type = '';
  73          if (isset($iminfo['mime']) AND !empty($iminfo['mime'])) {
  74              $mime = explode('/', $iminfo['mime']);
  75              if ((count($mime) > 1) AND ($mime[0] == 'image') AND (!empty($mime[1]))) {
  76                  $type = strtolower(trim($mime[1]));
  77              }
  78          }
  79          if (empty($type)) {
  80              $fileinfo = pathinfo($imgfile);
  81              if (isset($fileinfo['extension']) AND (!TCPDF_STATIC::empty_string($fileinfo['extension']))) {
  82                  $type = strtolower(trim($fileinfo['extension']));
  83              }
  84          }
  85          if ($type == 'jpg') {
  86              $type = 'jpeg';
  87          }
  88          return $type;
  89      }
  90  
  91      /**
  92       * Set the transparency for the given GD image.
  93       * @param $new_image (image) GD image object
  94       * @param $image (image) GD image object.
  95       * return GD image object.
  96       * @since 4.9.016 (2010-04-20)
  97       * @public static
  98       */
  99  	public static function setGDImageTransparency($new_image, $image) {
 100          // default transparency color (white)
 101          $tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
 102          // transparency index
 103          $tid = imagecolortransparent($image);
 104          $palletsize = imagecolorstotal($image);
 105          if (($tid >= 0) AND ($tid < $palletsize)) {
 106              // get the colors for the transparency index
 107              $tcol = imagecolorsforindex($image, $tid);
 108          }
 109          $tid = imagecolorallocate($new_image, $tcol['red'], $tcol['green'], $tcol['blue']);
 110          imagefill($new_image, 0, 0, $tid);
 111          imagecolortransparent($new_image, $tid);
 112          return $new_image;
 113      }
 114  
 115      /**
 116       * Convert the loaded image to a PNG and then return a structure for the PDF creator.
 117       * This function requires GD library and write access to the directory defined on K_PATH_CACHE constant.
 118       * @param $image (image) Image object.
 119       * @param $tempfile (string) Temporary file name.
 120       * return image PNG image object.
 121       * @since 4.9.016 (2010-04-20)
 122       * @public static
 123       */
 124  	public static function _toPNG($image, $tempfile) {
 125          // turn off interlaced mode
 126          imageinterlace($image, 0);
 127          // create temporary PNG image
 128          imagepng($image, $tempfile);
 129          // remove image from memory
 130          imagedestroy($image);
 131          // get PNG image data
 132          $retvars = self::_parsepng($tempfile);
 133          // tidy up by removing temporary image
 134          unlink($tempfile);
 135          return $retvars;
 136      }
 137  
 138      /**
 139       * Convert the loaded image to a JPEG and then return a structure for the PDF creator.
 140       * This function requires GD library and write access to the directory defined on K_PATH_CACHE constant.
 141       * @param $image (image) Image object.
 142       * @param $quality (int) JPEG quality.
 143       * @param $tempfile (string) Temporary file name.
 144       * return image JPEG image object.
 145       * @public static
 146       */
 147  	public static function _toJPEG($image, $quality, $tempfile) {
 148          imagejpeg($image, $tempfile, $quality);
 149          imagedestroy($image);
 150          $retvars = self::_parsejpeg($tempfile);
 151          // tidy up by removing temporary image
 152          unlink($tempfile);
 153          return $retvars;
 154      }
 155  
 156      /**
 157       * Extract info from a JPEG file without using the GD library.
 158       * @param $file (string) image file to parse
 159       * @return array structure containing the image data
 160       * @public static
 161       */
 162  	public static function _parsejpeg($file) {
 163          // check if is a local file
 164          if (!@file_exists($file)) {
 165              // try to encode spaces on filename
 166              $tfile = str_replace(' ', '%20', $file);
 167              if (@file_exists($tfile)) {
 168                  $file = $tfile;
 169              }
 170          }
 171          $a = getimagesize($file);
 172          if (empty($a)) {
 173              //Missing or incorrect image file
 174              return false;
 175          }
 176          if ($a[2] != 2) {
 177              // Not a JPEG file
 178              return false;
 179          }
 180          // bits per pixel
 181          $bpc = isset($a['bits']) ? intval($a['bits']) : 8;
 182          // number of image channels
 183          if (!isset($a['channels'])) {
 184              $channels = 3;
 185          } else {
 186              $channels = intval($a['channels']);
 187          }
 188          // default colour space
 189          switch ($channels) {
 190              case 1: {
 191                  $colspace = 'DeviceGray';
 192                  break;
 193              }
 194              case 3: {
 195                  $colspace = 'DeviceRGB';
 196                  break;
 197              }
 198              case 4: {
 199                  $colspace = 'DeviceCMYK';
 200                  break;
 201              }
 202              default: {
 203                  $channels = 3;
 204                  $colspace = 'DeviceRGB';
 205                  break;
 206              }
 207          }
 208          // get file content
 209          $data = file_get_contents($file);
 210          // check for embedded ICC profile
 211          $icc = array();
 212          $offset = 0;
 213          while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
 214              // get ICC sequence length
 215              $length = (TCPDF_STATIC::_getUSHORT($data, ($pos - 2)) - 16);
 216              // marker sequence number
 217              $msn = max(1, ord($data[($pos + 12)]));
 218              // number of markers (total of APP2 used)
 219              $nom = max(1, ord($data[($pos + 13)]));
 220              // get sequence segment
 221              $icc[($msn - 1)] = substr($data, ($pos + 14), $length);
 222              // move forward to next sequence
 223              $offset = ($pos + 14 + $length);
 224          }
 225          // order and compact ICC segments
 226          if (count($icc) > 0) {
 227              ksort($icc);
 228              $icc = implode('', $icc);
 229              if ((ord($icc[36]) != 0x61) OR (ord($icc[37]) != 0x63) OR (ord($icc[38]) != 0x73) OR (ord($icc[39]) != 0x70)) {
 230                  // invalid ICC profile
 231                  $icc = false;
 232              }
 233          } else {
 234              $icc = false;
 235          }
 236          return array('w' => $a[0], 'h' => $a[1], 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'DCTDecode', 'data' => $data);
 237      }
 238  
 239      /**
 240       * Extract info from a PNG file without using the GD library.
 241       * @param $file (string) image file to parse
 242       * @return array structure containing the image data
 243       * @public static
 244       */
 245  	public static function _parsepng($file) {
 246          $f = @fopen($file, 'rb');
 247          if ($f === false) {
 248              // Can't open image file
 249              return false;
 250          }
 251          //Check signature
 252          if (fread($f, 8) != chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10)) {
 253              // Not a PNG file
 254              return false;
 255          }
 256          //Read header chunk
 257          fread($f, 4);
 258          if (fread($f, 4) != 'IHDR') {
 259              //Incorrect PNG file
 260              return false;
 261          }
 262          $w = TCPDF_STATIC::_freadint($f);
 263          $h = TCPDF_STATIC::_freadint($f);
 264          $bpc = ord(fread($f, 1));
 265          $ct = ord(fread($f, 1));
 266          if ($ct == 0) {
 267              $colspace = 'DeviceGray';
 268          } elseif ($ct == 2) {
 269              $colspace = 'DeviceRGB';
 270          } elseif ($ct == 3) {
 271              $colspace = 'Indexed';
 272          } else {
 273              // alpha channel
 274              fclose($f);
 275              return 'pngalpha';
 276          }
 277          if (ord(fread($f, 1)) != 0) {
 278              // Unknown compression method
 279              fclose($f);
 280              return false;
 281          }
 282          if (ord(fread($f, 1)) != 0) {
 283              // Unknown filter method
 284              fclose($f);
 285              return false;
 286          }
 287          if (ord(fread($f, 1)) != 0) {
 288              // Interlacing not supported
 289              fclose($f);
 290              return false;
 291          }
 292          fread($f, 4);
 293          $channels = ($ct == 2 ? 3 : 1);
 294          $parms = '/DecodeParms << /Predictor 15 /Colors '.$channels.' /BitsPerComponent '.$bpc.' /Columns '.$w.' >>';
 295          //Scan chunks looking for palette, transparency and image data
 296          $pal = '';
 297          $trns = '';
 298          $data = '';
 299          $icc = false;
 300          $n = TCPDF_STATIC::_freadint($f);
 301          do {
 302              $type = fread($f, 4);
 303              if ($type == 'PLTE') {
 304                  // read palette
 305                  $pal = TCPDF_STATIC::rfread($f, $n);
 306                  fread($f, 4);
 307              } elseif ($type == 'tRNS') {
 308                  // read transparency info
 309                  $t = TCPDF_STATIC::rfread($f, $n);
 310                  if ($ct == 0) { // DeviceGray
 311                      $trns = array(ord($t[1]));
 312                  } elseif ($ct == 2) { // DeviceRGB
 313                      $trns = array(ord($t[1]), ord($t[3]), ord($t[5]));
 314                  } else { // Indexed
 315                      if ($n > 0) {
 316                          $trns = array();
 317                          for ($i = 0; $i < $n; ++ $i) {
 318                              $trns[] = ord($t{$i});
 319                          }
 320                      }
 321                  }
 322                  fread($f, 4);
 323              } elseif ($type == 'IDAT') {
 324                  // read image data block
 325                  $data .= TCPDF_STATIC::rfread($f, $n);
 326                  fread($f, 4);
 327              } elseif ($type == 'iCCP') {
 328                  // skip profile name
 329                  $len = 0;
 330                  while ((ord(fread($f, 1)) != 0) AND ($len < 80)) {
 331                      ++$len;
 332                  }
 333                  // get compression method
 334                  if (ord(fread($f, 1)) != 0) {
 335                      // Unknown filter method
 336                      fclose($f);
 337                      return false;
 338                  }
 339                  // read ICC Color Profile
 340                  $icc = TCPDF_STATIC::rfread($f, ($n - $len - 2));
 341                  // decompress profile
 342                  $icc = gzuncompress($icc);
 343                  fread($f, 4);
 344              } elseif ($type == 'IEND') {
 345                  break;
 346              } else {
 347                  TCPDF_STATIC::rfread($f, $n + 4);
 348              }
 349              $n = TCPDF_STATIC::_freadint($f);
 350          } while ($n);
 351          if (($colspace == 'Indexed') AND (empty($pal))) {
 352              // Missing palette
 353              fclose($f);
 354              return false;
 355          }
 356          fclose($f);
 357          return array('w' => $w, 'h' => $h, 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'FlateDecode', 'parms' => $parms, 'pal' => $pal, 'trns' => $trns, 'data' => $data);
 358      }
 359  
 360  } // END OF TCPDF_IMAGES CLASS
 361  
 362  //============================================================+
 363  // END OF FILE
 364  //============================================================+