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- <?php
- //============================================================+
- // File name : tcpdf_images.php
- // Version : 1.0.002
- // Begin : 2002-08-03
- // Last Update : 2013-11-24
- // Author : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
- // License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
- // -------------------------------------------------------------------
- // Copyright (C) 2002-2013 Nicola Asuni - Tecnick.com LTD
- //
- // This file is part of TCPDF software library.
- //
- // TCPDF is free software: you can redistribute it and/or modify it
- // under the terms of the GNU Lesser General Public License as
- // published by the Free Software Foundation, either version 3 of the
- // License, or (at your option) any later version.
- //
- // TCPDF is distributed in the hope that it will be useful, but
- // WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- // See the GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the License
- // along with TCPDF. If not, see
- // <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
- //
- // See LICENSE.TXT file for more information.
- // -------------------------------------------------------------------
- //
- // Description :
- // Static image methods used by the TCPDF class.
- //
- //============================================================+
- /**
- * @file
- * This is a PHP class that contains static image methods for the TCPDF class.<br>
- * @package com.tecnick.tcpdf
- * @author Nicola Asuni
- * @version 1.0.002
- */
- /**
- * @class TCPDF_IMAGES
- * Static image methods used by the TCPDF class.
- * @package com.tecnick.tcpdf
- * @brief PHP class for generating PDF documents without requiring external extensions.
- * @version 1.0.002
- * @author Nicola Asuni - info@tecnick.com
- */
- class TCPDF_IMAGES {
- /**
- * Array of hinheritable SVG properties.
- * @since 5.0.000 (2010-05-02)
- * @public static
- */
- 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');
- // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- /**
- * Return the image type given the file name or array returned by getimagesize() function.
- * @param $imgfile (string) image file name
- * @param $iminfo (array) array of image information returned by getimagesize() function.
- * @return string image type
- * @since 4.8.017 (2009-11-27)
- * @public static
- */
- public static function getImageFileType($imgfile, $iminfo=array()) {
- $type = '';
- if (isset($iminfo['mime']) AND !empty($iminfo['mime'])) {
- $mime = explode('/', $iminfo['mime']);
- if ((count($mime) > 1) AND ($mime[0] == 'image') AND (!empty($mime[1]))) {
- $type = strtolower(trim($mime[1]));
- }
- }
- if (empty($type)) {
- $fileinfo = pathinfo($imgfile);
- if (isset($fileinfo['extension']) AND (!TCPDF_STATIC::empty_string($fileinfo['extension']))) {
- $type = strtolower(trim($fileinfo['extension']));
- }
- }
- if ($type == 'jpg') {
- $type = 'jpeg';
- }
- return $type;
- }
- /**
- * Set the transparency for the given GD image.
- * @param $new_image (image) GD image object
- * @param $image (image) GD image object.
- * return GD image object.
- * @since 4.9.016 (2010-04-20)
- * @public static
- */
- public static function setGDImageTransparency($new_image, $image) {
- // transparency index
- $tid = imagecolortransparent($image);
- // default transparency color
- $tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
- if ($tid >= 0) {
- // get the colors for the transparency index
- $tcol = imagecolorsforindex($image, $tid);
- }
- $tid = imagecolorallocate($new_image, $tcol['red'], $tcol['green'], $tcol['blue']);
- imagefill($new_image, 0, 0, $tid);
- imagecolortransparent($new_image, $tid);
- return $new_image;
- }
- /**
- * Convert the loaded image to a PNG and then return a structure for the PDF creator.
- * This function requires GD library and write access to the directory defined on K_PATH_CACHE constant.
- * @param $image (image) Image object.
- * return image PNG image object.
- * @since 4.9.016 (2010-04-20)
- * @public static
- */
- public static function _toPNG($image) {
- // set temporary image file name
- $tempname = TCPDF_STATIC::getObjFilename('img');
- // turn off interlaced mode
- imageinterlace($image, 0);
- // create temporary PNG image
- imagepng($image, $tempname);
- // remove image from memory
- imagedestroy($image);
- // get PNG image data
- $retvars = self::_parsepng($tempname);
- // tidy up by removing temporary image
- unlink($tempname);
- return $retvars;
- }
- /**
- * Convert the loaded image to a JPEG and then return a structure for the PDF creator.
- * This function requires GD library and write access to the directory defined on K_PATH_CACHE constant.
- * @param $image (image) Image object.
- * @param $quality (int) JPEG quality.
- * return image JPEG image object.
- * @public static
- */
- public static function _toJPEG($image, $quality) {
- $tempname = TCPDF_STATIC::getObjFilename('img');
- imagejpeg($image, $tempname, $quality);
- imagedestroy($image);
- $retvars = self::_parsejpeg($tempname);
- // tidy up by removing temporary image
- unlink($tempname);
- return $retvars;
- }
- /**
- * Extract info from a JPEG file without using the GD library.
- * @param $file (string) image file to parse
- * @return array structure containing the image data
- * @public static
- */
- public static function _parsejpeg($file) {
- $a = getimagesize($file);
- if (empty($a)) {
- //Missing or incorrect image file
- return false;
- }
- if ($a[2] != 2) {
- // Not a JPEG file
- return false;
- }
- // bits per pixel
- $bpc = isset($a['bits']) ? intval($a['bits']) : 8;
- // number of image channels
- if (!isset($a['channels'])) {
- $channels = 3;
- } else {
- $channels = intval($a['channels']);
- }
- // default colour space
- switch ($channels) {
- case 1: {
- $colspace = 'DeviceGray';
- break;
- }
- case 3: {
- $colspace = 'DeviceRGB';
- break;
- }
- case 4: {
- $colspace = 'DeviceCMYK';
- break;
- }
- default: {
- $channels = 3;
- $colspace = 'DeviceRGB';
- break;
- }
- }
- // get file content
- $data = file_get_contents($file);
- // check for embedded ICC profile
- $icc = array();
- $offset = 0;
- while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
- // get ICC sequence length
- $length = (TCPDF_STATIC::_getUSHORT($data, ($pos - 2)) - 16);
- // marker sequence number
- $msn = max(1, ord($data[($pos + 12)]));
- // number of markers (total of APP2 used)
- $nom = max(1, ord($data[($pos + 13)]));
- // get sequence segment
- $icc[($msn - 1)] = substr($data, ($pos + 14), $length);
- // move forward to next sequence
- $offset = ($pos + 14 + $length);
- }
- // order and compact ICC segments
- if (count($icc) > 0) {
- ksort($icc);
- $icc = implode('', $icc);
- if ((ord($icc{36}) != 0x61) OR (ord($icc{37}) != 0x63) OR (ord($icc{38}) != 0x73) OR (ord($icc{39}) != 0x70)) {
- // invalid ICC profile
- $icc = false;
- }
- } else {
- $icc = false;
- }
- return array('w' => $a[0], 'h' => $a[1], 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'DCTDecode', 'data' => $data);
- }
- /**
- * Extract info from a PNG file without using the GD library.
- * @param $file (string) image file to parse
- * @return array structure containing the image data
- * @public static
- */
- public static function _parsepng($file) {
- $f = @fopen($file, 'rb');
- if ($f === false) {
- // Can't open image file
- return false;
- }
- //Check signature
- if (fread($f, 8) != chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10)) {
- // Not a PNG file
- return false;
- }
- //Read header chunk
- fread($f, 4);
- if (fread($f, 4) != 'IHDR') {
- //Incorrect PNG file
- return false;
- }
- $w = TCPDF_STATIC::_freadint($f);
- $h = TCPDF_STATIC::_freadint($f);
- $bpc = ord(fread($f, 1));
- $ct = ord(fread($f, 1));
- if ($ct == 0) {
- $colspace = 'DeviceGray';
- } elseif ($ct == 2) {
- $colspace = 'DeviceRGB';
- } elseif ($ct == 3) {
- $colspace = 'Indexed';
- } else {
- // alpha channel
- fclose($f);
- return 'pngalpha';
- }
- if (ord(fread($f, 1)) != 0) {
- // Unknown compression method
- fclose($f);
- return false;
- }
- if (ord(fread($f, 1)) != 0) {
- // Unknown filter method
- fclose($f);
- return false;
- }
- if (ord(fread($f, 1)) != 0) {
- // Interlacing not supported
- fclose($f);
- return false;
- }
- fread($f, 4);
- $channels = ($ct == 2 ? 3 : 1);
- $parms = '/DecodeParms << /Predictor 15 /Colors '.$channels.' /BitsPerComponent '.$bpc.' /Columns '.$w.' >>';
- //Scan chunks looking for palette, transparency and image data
- $pal = '';
- $trns = '';
- $data = '';
- $icc = false;
- do {
- $n = TCPDF_STATIC::_freadint($f);
- $type = fread($f, 4);
- if ($type == 'PLTE') {
- // read palette
- $pal = TCPDF_STATIC::rfread($f, $n);
- fread($f, 4);
- } elseif ($type == 'tRNS') {
- // read transparency info
- $t = TCPDF_STATIC::rfread($f, $n);
- if ($ct == 0) {
- $trns = array(ord($t{1}));
- } elseif ($ct == 2) {
- $trns = array(ord($t{1}), ord($t{3}), ord($t{5}));
- } else {
- $pos = strpos($t, chr(0));
- if ($pos !== false) {
- $trns = array($pos);
- }
- }
- fread($f, 4);
- } elseif ($type == 'IDAT') {
- // read image data block
- $data .= TCPDF_STATIC::rfread($f, $n);
- fread($f, 4);
- } elseif ($type == 'iCCP') {
- // skip profile name
- $len = 0;
- while ((ord(fread($f, 1)) > 0) AND ($len < 80)) {
- ++$len;
- }
- // skip null separator
- fread($f, 1);
- // get compression method
- if (ord(fread($f, 1)) != 0) {
- // Unknown filter method
- fclose($f);
- return false;
- }
- // read ICC Color Profile
- $icc = TCPDF_STATIC::rfread($f, ($n - $len - 2));
- // decompress profile
- $icc = gzuncompress($icc);
- fread($f, 4);
- } elseif ($type == 'IEND') {
- break;
- } else {
- TCPDF_STATIC::rfread($f, $n + 4);
- }
- } while ($n);
- if (($colspace == 'Indexed') AND (empty($pal))) {
- // Missing palette
- fclose($f);
- return false;
- }
- fclose($f);
- return array('w' => $w, 'h' => $h, 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'FlateDecode', 'parms' => $parms, 'pal' => $pal, 'trns' => $trns, 'data' => $data);
- }
- } // END OF TCPDF_IMAGES CLASS
- //============================================================+
- // END OF FILE
- //============================================================+
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