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<?php
//============================================================+
// File name : tcpdf_images.php
// Version : 1.0.005
// Begin : 2002-08-03
// Last Update : 2014-11-15
// 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) 2002-2014 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 1.0.005
*/
/**
* @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 1.0.005
* @author Nicola Asuni - info@tecnick.com
*/
class TCPDF_IMAGES {
/**
* Array of hinheritable SVG properties.
* @since 5.0.000 (2010-05-02)
* @public static
*
* @var string[]
*/
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');
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/**
* Return the image type given the file name or array returned by getimagesize() function.
* @param string $imgfile image file name
* @param array $iminfo array of image information returned by getimagesize() function.
* @return string image type
* @since 4.8.017 (2009-11-27)
* @public static
*/
public static function getImageFileType($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)) {
$type = strtolower(trim(pathinfo(parse_url($imgfile, PHP_URL_PATH), PATHINFO_EXTENSION)));
}
if ($type == 'jpg') {
$type = 'jpeg';
}
return $type;
}
/**
* Set the transparency for the given GD image.
* @param resource $new_image GD image object
* @param resource $image GD image object.
* @return resource GD image object $new_image
* @since 4.9.016 (2010-04-20)
* @public static
*/
public static function setGDImageTransparency($new_image, $image) {
// default transparency color (white)
$tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
// transparency index
$tid = imagecolortransparent($image);
$palletsize = imagecolorstotal($image);
if (($tid >= 0) AND ($tid < $palletsize)) {
// 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 resource $image Image object.
* @param string $tempfile Temporary file name.
* return image PNG image object.
* @since 4.9.016 (2010-04-20)
* @public static
*/
public static function _toPNG($image, $tempfile) {
// turn off interlaced mode
imageinterlace($image, 0);
// create temporary PNG image
imagepng($image, $tempfile);
// remove image from memory
imagedestroy($image);
// get PNG image data
$retvars = self::_parsepng($tempfile);
// tidy up by removing temporary image
unlink($tempfile);
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 resource $image Image object.
* @param int $quality JPEG quality.
* @param string $tempfile Temporary file name.
* return array|false image JPEG image object.
* @public static
*/
public static function _toJPEG($image, $quality, $tempfile) {
imagejpeg($image, $tempfile, $quality);
imagedestroy($image);
$retvars = self::_parsejpeg($tempfile);
// tidy up by removing temporary image
unlink($tempfile);
return $retvars;
}
/**
* Extract info from a JPEG file without using the GD library.
* @param string $file image file to parse
* @return array|false structure containing the image data
* @public static
*/
public static function _parsejpeg($file) {
// check if is a local file
if (!@TCPDF_STATIC::file_exists($file)) {
return false;
}
$a = getimagesize($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 string $file image file to parse
* @return array|false structure containing the image data
* @public static
*/
public static function _parsepng($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;
$n = TCPDF_STATIC::_freadint($f);
do {
$type = fread($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) { // DeviceGray
$trns = array(ord($t[1]));
} elseif ($ct == 2) { // DeviceRGB
$trns = array(ord($t[1]), ord($t[3]), ord($t[5]));
} else { // Indexed
if ($n > 0) {
$trns = array();
for ($i = 0; $i < $n; ++ $i) {
$trns[] = ord($t[$i]);
}
}
}
fread($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;
}
// 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);
}
$n = TCPDF_STATIC::_freadint($f);
} 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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