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tcpdf_images.php
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1 <?php
2 //============================================================+
3 // File name : tcpdf_images.php
4 // Version : 1.0.000
5 // Begin : 2002-08-03
6 // Last Update : 2013-03-16
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) 2002-2013 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 
52 class TCPDF_IMAGES {
53 
59  public static $svginheritprop = array('clip-rule', 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile', 'color-rendering', 'cursor', 'direction', 'fill', 'fill-opacity', 'fill-rule', 'font', 'font-family', 'font-size', 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'glyph-orientation-horizontal', 'glyph-orientation-vertical', 'image-rendering', 'kerning', 'letter-spacing', 'marker', 'marker-end', 'marker-mid', 'marker-start', 'pointer-events', 'shape-rendering', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'text-anchor', 'text-rendering', 'visibility', 'word-spacing', 'writing-mode');
60 
61 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
62 
71  public static function getImageFileType($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 $type;
89  }
90 
99  public static function setGDImageTransparency($new_image, $image) {
100  // transparency index
101  $tid = imagecolortransparent($image);
102  // default transparency color
103  $tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
104  if ($tid >= 0) {
105  // get the colors for the transparency index
106  $tcol = imagecolorsforindex($image, $tid);
107  }
108  $tid = imagecolorallocate($new_image, $tcol['red'], $tcol['green'], $tcol['blue']);
109  imagefill($new_image, 0, 0, $tid);
110  imagecolortransparent($new_image, $tid);
111  return $new_image;
112  }
113 
122  public static function _toPNG($image) {
123  // set temporary image file name
124  $tempname = TCPDF_STATIC::getObjFilename('png');
125  // turn off interlaced mode
126  imageinterlace($image, 0);
127  // create temporary PNG image
128  imagepng($image, $tempname);
129  // remove image from memory
130  imagedestroy($image);
131  // get PNG image data
132  $retvars = self::_parsepng($tempname);
133  // tidy up by removing temporary image
134  unlink($tempname);
135  return $retvars;
136  }
137 
146  public static function _toJPEG($image, $quality) {
147  $tempname = TCPDF_STATIC::getObjFilename('jpg');
148  imagejpeg($image, $tempname, $quality);
149  imagedestroy($image);
150  $retvars = self::_parsejpeg($tempname);
151  // tidy up by removing temporary image
152  unlink($tempname);
153  return $retvars;
154  }
155 
162  public static function _parsejpeg($file) {
163  $a = getimagesize($file);
164  if (empty($a)) {
165  //Missing or incorrect image file
166  return false;
167  }
168  if ($a[2] != 2) {
169  // Not a JPEG file
170  return false;
171  }
172  // bits per pixel
173  $bpc = isset($a['bits']) ? intval($a['bits']) : 8;
174  // number of image channels
175  if (!isset($a['channels'])) {
176  $channels = 3;
177  } else {
178  $channels = intval($a['channels']);
179  }
180  // default colour space
181  switch ($channels) {
182  case 1: {
183  $colspace = 'DeviceGray';
184  break;
185  }
186  case 3: {
187  $colspace = 'DeviceRGB';
188  break;
189  }
190  case 4: {
191  $colspace = 'DeviceCMYK';
192  break;
193  }
194  default: {
195  $channels = 3;
196  $colspace = 'DeviceRGB';
197  break;
198  }
199  }
200  // get file content
201  $data = file_get_contents($file);
202  // check for embedded ICC profile
203  $icc = array();
204  $offset = 0;
205  while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
206  // get ICC sequence length
207  $length = (TCPDF_STATIC::_getUSHORT($data, ($pos - 2)) - 16);
208  // marker sequence number
209  $msn = max(1, ord($data[($pos + 12)]));
210  // number of markers (total of APP2 used)
211  $nom = max(1, ord($data[($pos + 13)]));
212  // get sequence segment
213  $icc[($msn - 1)] = substr($data, ($pos + 14), $length);
214  // move forward to next sequence
215  $offset = ($pos + 14 + $length);
216  }
217  // order and compact ICC segments
218  if (count($icc) > 0) {
219  ksort($icc);
220  $icc = implode('', $icc);
221  if ((ord($icc{36}) != 0x61) OR (ord($icc{37}) != 0x63) OR (ord($icc{38}) != 0x73) OR (ord($icc{39}) != 0x70)) {
222  // invalid ICC profile
223  $icc = false;
224  }
225  } else {
226  $icc = false;
227  }
228  return array('w' => $a[0], 'h' => $a[1], 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'DCTDecode', 'data' => $data);
229  }
230 
237  public static function _parsepng($file) {
238  $f = fopen($file, 'rb');
239  if ($f === false) {
240  // Can't open image file
241  return false;
242  }
243  //Check signature
244  if (fread($f, 8) != chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10)) {
245  // Not a PNG file
246  return false;
247  }
248  //Read header chunk
249  fread($f, 4);
250  if (fread($f, 4) != 'IHDR') {
251  //Incorrect PNG file
252  return false;
253  }
254  $w = TCPDF_STATIC::_freadint($f);
255  $h = TCPDF_STATIC::_freadint($f);
256  $bpc = ord(fread($f, 1));
257  if ($bpc > 8) {
258  // 16-bit depth not supported
259  fclose($f);
260  return false;
261  }
262  $ct = ord(fread($f, 1));
263  if ($ct == 0) {
264  $colspace = 'DeviceGray';
265  } elseif ($ct == 2) {
266  $colspace = 'DeviceRGB';
267  } elseif ($ct == 3) {
268  $colspace = 'Indexed';
269  } else {
270  // alpha channel
271  fclose($f);
272  return 'pngalpha';
273  }
274  if (ord(fread($f, 1)) != 0) {
275  // Unknown compression method
276  fclose($f);
277  return false;
278  }
279  if (ord(fread($f, 1)) != 0) {
280  // Unknown filter method
281  fclose($f);
282  return false;
283  }
284  if (ord(fread($f, 1)) != 0) {
285  // Interlacing not supported
286  fclose($f);
287  return false;
288  }
289  fread($f, 4);
290  $channels = ($ct == 2 ? 3 : 1);
291  $parms = '/DecodeParms << /Predictor 15 /Colors '.$channels.' /BitsPerComponent '.$bpc.' /Columns '.$w.' >>';
292  //Scan chunks looking for palette, transparency and image data
293  $pal = '';
294  $trns = '';
295  $data = '';
296  $icc = false;
297  do {
298  $n = TCPDF_STATIC::_freadint($f);
299  $type = fread($f, 4);
300  if ($type == 'PLTE') {
301  // read palette
302  $pal = TCPDF_STATIC::rfread($f, $n);
303  fread($f, 4);
304  } elseif ($type == 'tRNS') {
305  // read transparency info
306  $t = TCPDF_STATIC::rfread($f, $n);
307  if ($ct == 0) {
308  $trns = array(ord($t{1}));
309  } elseif ($ct == 2) {
310  $trns = array(ord($t{1}), ord($t{3}), ord($t{5}));
311  } else {
312  $pos = strpos($t, chr(0));
313  if ($pos !== false) {
314  $trns = array($pos);
315  }
316  }
317  fread($f, 4);
318  } elseif ($type == 'IDAT') {
319  // read image data block
320  $data .= TCPDF_STATIC::rfread($f, $n);
321  fread($f, 4);
322  } elseif ($type == 'iCCP') {
323  // skip profile name
324  $len = 0;
325  while ((ord(fread($f, 1)) > 0) AND ($len < 80)) {
326  ++$len;
327  }
328  // skip null separator
329  fread($f, 1);
330  // get compression method
331  if (ord(fread($f, 1)) != 0) {
332  // Unknown filter method
333  fclose($f);
334  return false;
335  }
336  // read ICC Color Profile
337  $icc = TCPDF_STATIC::rfread($f, ($n - $len - 2));
338  // decompress profile
339  $icc = gzuncompress($icc);
340  fread($f, 4);
341  } elseif ($type == 'IEND') {
342  break;
343  } else {
344  TCPDF_STATIC::rfread($f, $n + 4);
345  }
346  } while ($n);
347  if (($colspace == 'Indexed') AND (empty($pal))) {
348  // Missing palette
349  fclose($f);
350  return false;
351  }
352  fclose($f);
353  return array('w' => $w, 'h' => $h, 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'FlateDecode', 'parms' => $parms, 'pal' => $pal, 'trns' => $trns, 'data' => $data);
354  }
355 
356 } // END OF TCPDF_STATIC CLASS
357 
358 //============================================================+
359 // END OF FILE
360 //============================================================+