source-class-TCPDF_IMAGES

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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: //============================================================+
365: 
 

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