140 lines
3.8 KiB
PHP
140 lines
3.8 KiB
PHP
#!/usr/bin/php
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<?php
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/**
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* PEL: PHP Exif Library.
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* A library with support for reading and
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* writing all Exif headers in JPEG and TIFF images using PHP.
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*
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* Copyright (C) 2006, 2007 Martin Geisler.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in the file COPYING; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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namespace Pel\examples;
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use lsolesen\pel\Pel;
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use lsolesen\pel\PelJpeg;
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/**
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* a printf() variant that appends a newline to the output.
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*/
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function println($args)
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{
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$args = func_get_args();
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$fmt = array_shift($args);
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vprintf($fmt . "\n", $args);
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}
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/* Make PEL speak the users language, if it is available. */
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setlocale(LC_ALL, '');
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$argv = $_SERVER['argv'];
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/*
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* Store the name of the script in $prog and remove this first part of
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* the command line.
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*/
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$prog = array_shift($argv);
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$error = false;
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/*
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* The next argument could be -d to signal debug mode where lots of
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* extra information is printed out when the image is parsed.
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*/
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if (isset($argv[0]) && $argv[0] == '-d') {
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Pel::setDebug(true);
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array_shift($argv);
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}
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/* The mandatory input filename. */
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if (isset($argv[0])) {
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$input = array_shift($argv);
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} else {
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$error = true;
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}
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/* The mandatory output filename. */
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if (isset($argv[0])) {
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$output = array_shift($argv);
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} else {
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$error = true;
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}
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/* The mandatory scale factor. */
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if (isset($argv[0])) {
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$scale = array_shift($argv);
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} else {
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$error = true;
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}
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/*
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* Usage information is printed if an error was found in the command
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* line arguments.
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*/
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if ($error) {
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println('Usage: %s [-d] <input> <output> <scale>', $prog);
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println('Optional arguments:');
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println(' -d turn debug output on.');
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println('Mandatory arguments:');
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println(' input the input filename, a JPEG image.');
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println(' output filename for saving the changed image.');
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println(' scale scale factor, say 0.5 to resize to half the ' . 'original size.');
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exit(1);
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}
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/* The input file is now loaded into a PelJpeg object. */
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println('Reading file "%s".', $input);
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$input_jpeg = new PelJpeg($input);
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/*
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* The input image is already loaded, so we can reuse the bytes stored
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* in $input_jpeg when creating the Image resource.
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*/
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$original = ImageCreateFromString($input_jpeg->getBytes());
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if ($original === false) {
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throw new \Exception('Can\'t create image from string');
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}
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$original_w = ImagesX($original);
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$original_h = ImagesY($original);
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$scaled_w = $original_w * $scale;
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$scaled_h = $original_h * $scale;
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/* Now create the scaled image. */
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$scaled = ImageCreateTrueColor($scaled_w, $scaled_h);
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if ($original === false) {
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throw new \Exception('Can\'t create true color image from scaled resources');
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}
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ImageCopyResampled($scaled, $original, 0, 0, 0, 0, $scaled_w, $scaled_h, $original_w, $original_h);
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/*
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* We want the raw JPEG data from $scaled. Luckily, one can create a
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* PelJpeg object from an image resource directly:
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*/
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$output_jpeg = new PelJpeg($scaled);
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/* Retrieve the original Exif data in $jpeg (if any). */
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$exif = $input_jpeg->getExif();
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/* If no Exif data was present, then $exif is null. */
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if ($exif != null) {
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$output_jpeg->setExif($exif);
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}
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/* We can now save the scaled image. */
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println('Writing file "%s".', $output);
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$output_jpeg->saveFile($output);
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