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https://github.com/vdm-io/tcpdf.git
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360 lines
11 KiB
PHP
360 lines
11 KiB
PHP
<?php
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//============================================================+
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// File name : tcpdf_images.php
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// Version : 1.0.005
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// Begin : 2002-08-03
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// Last Update : 2014-11-15
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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) 2002-2014 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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/**
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* @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 1.0.005
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*/
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/**
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* @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 1.0.005
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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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/**
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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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* @var string[]
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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', '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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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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/**
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* Return the image type given the file name or array returned by getimagesize() function.
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* @param string $imgfile image file name
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* @param array $iminfo array of image information returned by getimagesize() function.
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* @return string image type
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* @since 4.8.017 (2009-11-27)
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* @public static
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*/
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public static function getImageFileType($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($type)) {
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$type = strtolower(trim(pathinfo(parse_url($imgfile, PHP_URL_PATH), PATHINFO_EXTENSION)));
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}
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if ($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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/**
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* Set the transparency for the given GD image.
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* @param resource $new_image GD image object
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* @param resource $image GD image object.
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* @return resource GD image object $new_image
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* @since 4.9.016 (2010-04-20)
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* @public static
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*/
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public static function setGDImageTransparency($new_image, $image) {
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// default transparency color (white)
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$tcol = array('red' => 255, 'green' => 255, 'blue' => 255);
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// transparency index
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$tid = imagecolortransparent($image);
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$palletsize = imagecolorstotal($image);
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if (($tid >= 0) AND ($tid < $palletsize)) {
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// get the colors for the transparency index
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$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;
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}
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/**
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* 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.
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* @param resource $image Image object.
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* @param string $tempfile Temporary file name.
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* return image PNG image object.
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* @since 4.9.016 (2010-04-20)
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* @public static
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*/
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public static function _toPNG($image, $tempfile) {
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// turn off interlaced mode
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imageinterlace($image, 0);
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// create temporary PNG image
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imagepng($image, $tempfile);
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// remove image from memory
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imagedestroy($image);
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// get PNG image data
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$retvars = self::_parsepng($tempfile);
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// tidy up by removing temporary image
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unlink($tempfile);
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return $retvars;
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}
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/**
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* Convert the loaded image to a JPEG 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.
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* @param resource $image Image object.
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* @param int $quality JPEG quality.
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* @param string $tempfile Temporary file name.
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* return array|false image JPEG image object.
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* @public static
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*/
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public static function _toJPEG($image, $quality, $tempfile) {
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imagejpeg($image, $tempfile, $quality);
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imagedestroy($image);
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$retvars = self::_parsejpeg($tempfile);
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// tidy up by removing temporary image
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unlink($tempfile);
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return $retvars;
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}
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/**
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* Extract info from a JPEG file without using the GD library.
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* @param string $file image file to parse
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* @return array|false structure containing the image data
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* @public static
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*/
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public static function _parsejpeg($file) {
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// check if is a local file
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if (!@TCPDF_STATIC::file_exists($file)) {
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return false;
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}
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$a = getimagesize($file);
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if (empty($a)) {
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//Missing or incorrect image file
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return false;
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}
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if ($a[2] != 2) {
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// Not a JPEG file
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return false;
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}
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// bits per pixel
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$bpc = isset($a['bits']) ? intval($a['bits']) : 8;
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// number of image channels
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if (!isset($a['channels'])) {
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$channels = 3;
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} else {
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$channels = intval($a['channels']);
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}
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// default colour space
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switch ($channels) {
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case 1: {
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$colspace = 'DeviceGray';
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break;
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}
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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;
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}
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default: {
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$channels = 3;
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$colspace = 'DeviceRGB';
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break;
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}
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}
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// get file content
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$data = file_get_contents($file);
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// check for embedded ICC profile
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$icc = array();
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$offset = 0;
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while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
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// get ICC sequence length
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$length = (TCPDF_STATIC::_getUSHORT($data, ($pos - 2)) - 16);
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// marker sequence number
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$msn = max(1, ord($data[($pos + 12)]));
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// number of markers (total of APP2 used)
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$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 + $length);
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}
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// order and compact ICC segments
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if (count($icc) > 0) {
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ksort($icc);
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$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;
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}
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} else {
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$icc = false;
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}
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return array('w' => $a[0], 'h' => $a[1], 'ch' => $channels, 'icc' => $icc, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'DCTDecode', 'data' => $data);
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}
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/**
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* Extract info from a PNG file without using the GD library.
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* @param string $file image file to parse
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* @return array|false structure containing the image data
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* @public static
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*/
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public static function _parsepng($file) {
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$f = @fopen($file, 'rb');
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if ($f === false) {
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// Can't open image file
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return false;
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}
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//Check signature
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if (fread($f, 8) != chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10)) {
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// Not a PNG file
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return false;
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}
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//Read header chunk
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fread($f, 4);
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if (fread($f, 4) != 'IHDR') {
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//Incorrect PNG file
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return false;
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}
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$w = TCPDF_STATIC::_freadint($f);
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$h = TCPDF_STATIC::_freadint($f);
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$bpc = ord(fread($f, 1));
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$ct = ord(fread($f, 1));
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if ($ct == 0) {
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$colspace = 'DeviceGray';
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} elseif ($ct == 2) {
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$colspace = 'DeviceRGB';
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} elseif ($ct == 3) {
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$colspace = 'Indexed';
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} else {
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// alpha channel
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fclose($f);
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return 'pngalpha';
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}
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if (ord(fread($f, 1)) != 0) {
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// Unknown compression method
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fclose($f);
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return false;
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}
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if (ord(fread($f, 1)) != 0) {
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// Unknown filter method
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fclose($f);
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return false;
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}
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if (ord(fread($f, 1)) != 0) {
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// Interlacing not supported
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fclose($f);
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return false;
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}
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fread($f, 4);
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$channels = ($ct == 2 ? 3 : 1);
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$parms = '/DecodeParms << /Predictor 15 /Colors '.$channels.' /BitsPerComponent '.$bpc.' /Columns '.$w.' >>';
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//Scan chunks looking for palette, transparency and image data
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$pal = '';
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$trns = '';
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$data = '';
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$icc = false;
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$n = TCPDF_STATIC::_freadint($f);
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do {
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$type = fread($f, 4);
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if ($type == 'PLTE') {
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// read palette
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$pal = TCPDF_STATIC::rfread($f, $n);
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fread($f, 4);
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} elseif ($type == 'tRNS') {
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// read transparency info
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$t = TCPDF_STATIC::rfread($f, $n);
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if ($ct == 0) { // DeviceGray
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$trns = array(ord($t[1]));
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} elseif ($ct == 2) { // DeviceRGB
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$trns = array(ord($t[1]), ord($t[3]), ord($t[5]));
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} else { // Indexed
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if ($n > 0) {
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$trns = array();
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for ($i = 0; $i < $n; ++ $i) {
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$trns[] = ord($t[$i]);
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}
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}
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}
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fread($f, 4);
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} elseif ($type == 'IDAT') {
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// read image data block
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$data .= TCPDF_STATIC::rfread($f, $n);
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fread($f, 4);
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} elseif ($type == 'iCCP') {
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// skip profile name
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$len = 0;
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while ((ord(fread($f, 1)) != 0) AND ($len < 80)) {
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++$len;
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}
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// get compression method
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if (ord(fread($f, 1)) != 0) {
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// Unknown filter method
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fclose($f);
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return false;
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}
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// read ICC Color Profile
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$icc = TCPDF_STATIC::rfread($f, ($n - $len - 2));
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// decompress profile
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$icc = gzuncompress($icc);
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fread($f, 4);
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} elseif ($type == 'IEND') {
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break;
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} else {
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TCPDF_STATIC::rfread($f, $n + 4);
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}
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$n = TCPDF_STATIC::_freadint($f);
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} while ($n);
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if (($colspace == 'Indexed') AND (empty($pal))) {
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// Missing palette
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fclose($f);
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return false;
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}
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fclose($f);
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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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}
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} // END OF TCPDF_IMAGES CLASS
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//============================================================+
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// END OF FILE
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//============================================================+
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