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1665 raphael 1
<?php
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//============================================================+
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// File name   : tcpdf_images.php
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// Version     : 1.0.000
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// Begin       : 2002-08-03
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// Last Update : 2013-03-16
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// Author      : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
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// License     : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
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// -------------------------------------------------------------------
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// Copyright (C) 2002-2013 Nicola Asuni - Tecnick.com LTD
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//
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// This file is part of TCPDF software library.
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//
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// TCPDF is free software: you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// TCPDF is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the License
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// along with TCPDF. If not, see
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// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
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//
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// See LICENSE.TXT file for more information.
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// -------------------------------------------------------------------
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//
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// Description :
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//   Static image methods used by the TCPDF class.
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//
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//============================================================+
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36
/**
37
 * @file
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 * This is a PHP class that contains static image methods for the TCPDF class.<br>
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 * @package com.tecnick.tcpdf
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 * @author Nicola Asuni
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 * @version 1.0.000
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 */
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44
/**
45
 * @class TCPDF_IMAGES
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 * Static image methods used by the TCPDF class.
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 * @package com.tecnick.tcpdf
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 * @brief PHP class for generating PDF documents without requiring external extensions.
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 * @version 1.0.000
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 * @author Nicola Asuni - info@tecnick.com
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 */
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class TCPDF_IMAGES {
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54
	/**
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	 * Array of hinheritable SVG properties.
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	 * @since 5.0.000 (2010-05-02)
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	 * @public static
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	 */
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	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');
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61
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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63
	/**
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	 * Return the image type given the file name or array returned by getimagesize() function.
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	 * @param $imgfile (string) image file name
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	 * @param $iminfo (array) array of image information returned by getimagesize() function.
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	 * @return string image type
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	 * @since 4.8.017 (2009-11-27)
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	 * @public static
70
	 */
71
	public static function getImageFileType($imgfile, $iminfo=array()) {
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		$type = '';
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		if (isset($iminfo['mime']) AND !empty($iminfo['mime'])) {
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			$mime = explode('/', $iminfo['mime']);
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			if ((count($mime) > 1) AND ($mime[0] == 'image') AND (!empty($mime[1]))) {
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				$type = strtolower(trim($mime[1]));
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			}
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		}
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		if (empty($type)) {
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			$fileinfo = pathinfo($imgfile);
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			if (isset($fileinfo['extension']) AND (!TCPDF_STATIC::empty_string($fileinfo['extension']))) {
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				$type = strtolower(trim($fileinfo['extension']));
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			}
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		}
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		if ($type == 'jpg') {
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			$type = 'jpeg';
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		}
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		return $type;
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	}
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91
	/**
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	 * Set the transparency for the given GD image.
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	 * @param $new_image (image) GD image object
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	 * @param $image (image) GD image object.
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	 * return GD image object.
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	 * @since 4.9.016 (2010-04-20)
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	 * @public static
98
	 */
99
	public static function setGDImageTransparency($new_image, $image) {
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		// transparency index
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		$tid = imagecolortransparent($image);
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		// default transparency color
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		$tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
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		if ($tid >= 0) {
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			// get the colors for the transparency index
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			$tcol = imagecolorsforindex($image, $tid);
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		}
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		$tid = imagecolorallocate($new_image, $tcol['red'], $tcol['green'], $tcol['blue']);
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		imagefill($new_image, 0, 0, $tid);
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		imagecolortransparent($new_image, $tid);
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		return $new_image;
112
	}
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114
	/**
115
	 * Convert the loaded image to a PNG and then return a structure for the PDF creator.
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	 * This function requires GD library and write access to the directory defined on K_PATH_CACHE constant.
117
	 * @param $image (image) Image object.
118
	 * return image PNG image object.
119
	 * @since 4.9.016 (2010-04-20)
120
	 * @public static
121
	 */
122
	public static function _toPNG($image) {
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		// set temporary image file name
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		$tempname = TCPDF_STATIC::getObjFilename('png');
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		// turn off interlaced mode
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		imageinterlace($image, 0);
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		// create temporary PNG image
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		imagepng($image, $tempname);
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		// remove image from memory
130
		imagedestroy($image);
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		// get PNG image data
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		$retvars = self::_parsepng($tempname);
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		// tidy up by removing temporary image
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		unlink($tempname);
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 $quality (int) JPEG quality.
143
	 * return image JPEG image object.
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	 * @public static
145
	 */
146
	public static function _toJPEG($image, $quality) {
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		$tempname = TCPDF_STATIC::getObjFilename('jpg');
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		imagejpeg($image, $tempname, $quality);
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		imagedestroy($image);
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		$retvars = self::_parsejpeg($tempname);
151
		// tidy up by removing temporary image
152
		unlink($tempname);
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) {
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		$a = getimagesize($file);
164
		if (empty($a)) {
165
			//Missing or incorrect image file
166
			return false;
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		}
168
		if ($a[2] != 2) {
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			// Not a JPEG file
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			return false;
171
		}
172
		// bits per pixel
173
		$bpc = isset($a['bits']) ? intval($a['bits']) : 8;
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		// number of image channels
175
		if (!isset($a['channels'])) {
176
			$channels = 3;
177
		} else {
178
			$channels = intval($a['channels']);
179
		}
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		// default colour space
181
		switch ($channels) {
182
			case 1: {
183
				$colspace = 'DeviceGray';
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				break;
185
			}
186
			case 3: {
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				$colspace = 'DeviceRGB';
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				break;
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			}
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			case 4: {
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				$colspace = 'DeviceCMYK';
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				break;
193
			}
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			default: {
195
				$channels = 3;
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				$colspace = 'DeviceRGB';
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				break;
198
			}
199
		}
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		// get file content
201
		$data = file_get_contents($file);
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		// check for embedded ICC profile
203
		$icc = array();
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		$offset = 0;
205
		while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
206
			// get ICC sequence length
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			$length = (TCPDF_STATIC::_getUSHORT($data, ($pos - 2)) - 16);
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			// marker sequence number
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			$msn = max(1, ord($data[($pos + 12)]));
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			// number of markers (total of APP2 used)
211
			$nom = max(1, ord($data[($pos + 13)]));
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			// get sequence segment
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			$icc[($msn - 1)] = substr($data, ($pos + 14), $length);
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			// move forward to next sequence
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			$offset = ($pos + 14 + $length);
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		}
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		// order and compact ICC segments
218
		if (count($icc) > 0) {
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			ksort($icc);
220
			$icc = implode('', $icc);
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			if ((ord($icc{36}) != 0x61) OR (ord($icc{37}) != 0x63) OR (ord($icc{38}) != 0x73) OR (ord($icc{39}) != 0x70)) {
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				// invalid ICC profile
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				$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
 
231
	/**
232
	 * Extract info from a PNG file without using the GD library.
233
	 * @param $file (string) image file to parse
234
	 * @return array structure containing the image data
235
	 * @public static
236
	 */
237
	public static function _parsepng($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
//============================================================+