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