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1 dashley 33 <?php
2     //--------------------------------------------------------------------------------
3     //thumbnails_make.php, v0.1a, Copyright David T. Ashley, 2016
4     //--------------------------------------------------------------------------------
5     //-------------------------------------------------------------------------------------------------
6     //Copyright 2016 David T. Ashley
7     //-------------------------------------------------------------------------------------------------
8     //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
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502     // In the following three paragraphs, a "patent license" is any express
503     //agreement or commitment, however denominated, not to enforce a patent
504     //(such as an express permission to practice a patent or covenant not to
505     //sue for patent infringement). To "grant" such a patent license to a
506     //party means to make such an agreement or commitment not to enforce a
507     //patent against the party.
508     //
509     // If you convey a covered work, knowingly relying on a patent license,
510     //and the Corresponding Source of the work is not available for anyone
511     //to copy, free of charge and under the terms of this License, through a
512     //publicly available network server or other readily accessible means,
513     //then you must either (1) cause the Corresponding Source to be so
514     //available, or (2) arrange to deprive yourself of the benefit of the
515     //patent license for this particular work, or (3) arrange, in a manner
516     //consistent with the requirements of this License, to extend the patent
517     //license to downstream recipients. "Knowingly relying" means you have
518     //actual knowledge that, but for the patent license, your conveying the
519     //covered work in a country, or your recipient's use of the covered work
520     //in a country, would infringe one or more identifiable patents in that
521     //country that you have reason to believe are valid.
522     //
523     // If, pursuant to or in connection with a single transaction or
524     //arrangement, you convey, or propagate by procuring conveyance of, a
525     //covered work, and grant a patent license to some of the parties
526     //receiving the covered work authorizing them to use, propagate, modify
527     //or convey a specific copy of the covered work, then the patent license
528     //you grant is automatically extended to all recipients of the covered
529     //work and works based on it.
530     //
531     // A patent license is "discriminatory" if it does not include within
532     //the scope of its coverage, prohibits the exercise of, or is
533     //conditioned on the non-exercise of one or more of the rights that are
534     //specifically granted under this License. You may not convey a covered
535     //work if you are a party to an arrangement with a third party that is
536     //in the business of distributing software, under which you make payment
537     //to the third party based on the extent of your activity of conveying
538     //the work, and under which the third party grants, to any of the
539     //parties who would receive the covered work from you, a discriminatory
540     //patent license (a) in connection with copies of the covered work
541     //conveyed by you (or copies made from those copies), or (b) primarily
542     //for and in connection with specific products or compilations that
543     //contain the covered work, unless you entered into that arrangement,
544     //or that patent license was granted, prior to 28 March 2007.
545     //
546     // Nothing in this License shall be construed as excluding or limiting
547     //any implied license or other defenses to infringement that may
548     //otherwise be available to you under applicable patent law.
549     //
550     // 12. No Surrender of Others' Freedom.
551     //
552     // If conditions are imposed on you (whether by court order, agreement or
553     //otherwise) that contradict the conditions of this License, they do not
554     //excuse you from the conditions of this License. If you cannot convey a
555     //covered work so as to satisfy simultaneously your obligations under this
556     //License and any other pertinent obligations, then as a consequence you may
557     //not convey it at all. For example, if you agree to terms that obligate you
558     //to collect a royalty for further conveying from those to whom you convey
559     //the Program, the only way you could satisfy both those terms and this
560     //License would be to refrain entirely from conveying the Program.
561     //
562     // 13. Use with the GNU Affero General Public License.
563     //
564     // Notwithstanding any other provision of this License, you have
565     //permission to link or combine any covered work with a work licensed
566     //under version 3 of the GNU Affero General Public License into a single
567     //combined work, and to convey the resulting work. The terms of this
568     //License will continue to apply to the part which is the covered work,
569     //but the special requirements of the GNU Affero General Public License,
570     //section 13, concerning interaction through a network will apply to the
571     //combination as such.
572     //
573     // 14. Revised Versions of this License.
574     //
575     // The Free Software Foundation may publish revised and/or new versions of
576     //the GNU General Public License from time to time. Such new versions will
577     //be similar in spirit to the present version, but may differ in detail to
578     //address new problems or concerns.
579     //
580     // Each version is given a distinguishing version number. If the
581     //Program specifies that a certain numbered version of the GNU General
582     //Public License "or any later version" applies to it, you have the
583     //option of following the terms and conditions either of that numbered
584     //version or of any later version published by the Free Software
585     //Foundation. If the Program does not specify a version number of the
586     //GNU General Public License, you may choose any version ever published
587     //by the Free Software Foundation.
588     //
589     // If the Program specifies that a proxy can decide which future
590     //versions of the GNU General Public License can be used, that proxy's
591     //public statement of acceptance of a version permanently authorizes you
592     //to choose that version for the Program.
593     //
594     // Later license versions may give you additional or different
595     //permissions. However, no additional obligations are imposed on any
596     //author or copyright holder as a result of your choosing to follow a
597     //later version.
598     //
599     // 15. Disclaimer of Warranty.
600     //
601     // THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
602     //APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
603     //HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
604     //OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
605     //THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
606     //PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
607     //IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
608     //ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
609     //
610     // 16. Limitation of Liability.
611     //
612     // IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
613     //WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
614     //THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
615     //GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
616     //USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
617     //DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
618     //PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
619     //EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
620     //SUCH DAMAGES.
621     //
622     // 17. Interpretation of Sections 15 and 16.
623     //
624     // If the disclaimer of warranty and limitation of liability provided
625     //above cannot be given local legal effect according to their terms,
626     //reviewing courts shall apply local law that most closely approximates
627     //an absolute waiver of all civil liability in connection with the
628     //Program, unless a warranty or assumption of liability accompanies a
629     //copy of the Program in return for a fee.
630     //
631     // END OF TERMS AND CONDITIONS
632     //
633     // How to Apply These Terms to Your New Programs
634     //
635     // If you develop a new program, and you want it to be of the greatest
636     //possible use to the public, the best way to achieve this is to make it
637     //free software which everyone can redistribute and change under these terms.
638     //
639     // To do so, attach the following notices to the program. It is safest
640     //to attach them to the start of each source file to most effectively
641     //state the exclusion of warranty; and each file should have at least
642     //the "copyright" line and a pointer to where the full notice is found.
643     //
644     // <one line to give the program's name and a brief idea of what it does.>
645     // Copyright (C) <year> <name of author>
646     //
647     // This program is free software: you can redistribute it and/or modify
648     // it under the terms of the GNU General Public License as published by
649     // the Free Software Foundation, either version 3 of the License, or
650     // (at your option) any later version.
651     //
652     // This program is distributed in the hope that it will be useful,
653     // but WITHOUT ANY WARRANTY; without even the implied warranty of
654     // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
655     // GNU General Public License for more details.
656     //
657     // You should have received a copy of the GNU General Public License
658     // along with this program. If not, see <http://www.gnu.org/licenses/>.
659     //
660     //Also add information on how to contact you by electronic and paper mail.
661     //
662     // If the program does terminal interaction, make it output a short
663     //notice like this when it starts in an interactive mode:
664     //
665     // <program> Copyright (C) <year> <name of author>
666     // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
667     // This is free software, and you are welcome to redistribute it
668     // under certain conditions; type `show c' for details.
669     //
670     //The hypothetical commands `show w' and `show c' should show the appropriate
671     //parts of the General Public License. Of course, your program's commands
672     //might be different; for a GUI interface, you would use an "about box".
673     //
674     // You should also get your employer (if you work as a programmer) or school,
675     //if any, to sign a "copyright disclaimer" for the program, if necessary.
676     //For more information on this, and how to apply and follow the GNU GPL, see
677     //<http://www.gnu.org/licenses/>.
678     //
679     // The GNU General Public License does not permit incorporating your program
680     //into proprietary programs. If your program is a subroutine library, you
681     //may consider it more useful to permit linking proprietary applications with
682     //the library. If this is what you want to do, use the GNU Lesser General
683     //Public License instead of this License. But first, please read
684     //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
685     //-------------------------------------------------------------------------------------------------
686     //This program, a PHP script, creates thumbnail images for recognized
687     //image files in the current working directory. This program is part of a
688     //3-program suite designed to collectively create a web page directly from
689     //digital camera files (and of course the web page can be customized by
690     //hand-editing after it is automatically generated). The supported process for
691     //creating a web page involves 3 programs (rather than 1) primarily to circumvent
692     //the involuntary process termination that will occur in some shared environments
693     //if a process consumes too much CPU time.
694     //
695     //The 3 programs in the 3-program suite are:
696     //
697     // filenames_canonize.php:
698     // Converts all names of files in a directory to lower-case, and makes
699     // substitutions for any unusual characters.
700     //
701     // thumbnails_make.php (this program):
702     // Creates thumbnails from recognized image types. The thumbnails are
703     // named relative to the original image file with the suffix "_small".
704     // Only 20 files are converted on each invocation of the program, to
705     // avoid the involuntary process termination that typically occurs in
706     // a shared hosting environment when a process uses too much CPU time.
707     // The program should be run repeatedly until it indicates that it has
708     // no more thumbnails to create.
709     //
710     // If any full-sized photos are modified, any corresponding thumbnails
711     // should be deleted and thumbnails_make.php and indexfile_make.php should
712     // be run again.
713     //
714     // indexfile_make.php
715     // Scans a directory and makes an index file ("index2.php") displaying
716     // all the thumbnail images, each of which link to the corresponding
717     // full-sized image. The index file is tailored to Dave Ashley's
718     // needs, but the created file can be edited and most of the content
719     // pasted into an HTML file. To avoid the accidental loss of
720     // information, any existing "index2.php" file is renamed out of the
721     // way.
722     //
723     //This script is designed to be run manually (rather than automatically invoked
724     //as a result of a web page request). It was written in PHP for convenience
725     //simply because DreamHost (the web hosting company Dave Ashley uses) has as part
726     //of its hosting environment PHP with the ImageMagick library compiled in.
727     //
728     //Usually, this script is invoked using "php <path>/thumbnails_make.php", but the
729     //method of invocation may vary based on computing platform details.
730     //--------------------------------------------------------------------------------
731     //This program is free software: you can redistribute it and/or modify
732     //it under the terms of the GNU General Public License as published by
733     //the Free Software Foundation, either version 3 of the License, or
734     //(at your option) any later version.
735     //
736     //This program is distributed in the hope that it will be useful,
737     //but WITHOUT ANY WARRANTY; without even the implied warranty of
738     //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
739     //GNU General Public License for more details.
740     //
741     //The GNU General Public License is reproduced below, and also is
742     //available at http://www.gnu.org/licenses/.
743     //--------------------------------------------------------------------------------
744     // GNU GENERAL PUBLIC LICENSE
745     // Version 3, 29 June 2007
746     //
747     // Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
748     // Everyone is permitted to copy and distribute verbatim copies
749     // of this license document, but changing it is not allowed.
750     //
751     // Preamble
752     //
753     // The GNU General Public License is a free, copyleft license for
754     // software and other kinds of works.
755     //
756     // The licenses for most software and other practical works are designed
757     // to take away your freedom to share and change the works. By contrast,
758     // the GNU General Public License is intended to guarantee your freedom to
759     // share and change all versions of a program--to make sure it remains free
760     // software for all its users. We, the Free Software Foundation, use the
761     // GNU General Public License for most of our software; it applies also to
762     // any other work released this way by its authors. You can apply it to
763     // your programs, too.
764     //
765     // When we speak of free software, we are referring to freedom, not
766     // price. Our General Public Licenses are designed to make sure that you
767     // have the freedom to distribute copies of free software (and charge for
768     // them if you wish), that you receive source code or can get it if you
769     // want it, that you can change the software or use pieces of it in new
770     // free programs, and that you know you can do these things.
771     //
772     // To protect your rights, we need to prevent others from denying you
773     // these rights or asking you to surrender the rights. Therefore, you have
774     // certain responsibilities if you distribute copies of the software, or if
775     // you modify it: responsibilities to respect the freedom of others.
776     //
777     // For example, if you distribute copies of such a program, whether
778     // gratis or for a fee, you must pass on to the recipients the same
779     // freedoms that you received. You must make sure that they, too, receive
780     // or can get the source code. And you must show them these terms so they
781     // know their rights.
782     //
783     // Developers that use the GNU GPL protect your rights with two steps:
784     // (1) assert copyright on the software, and (2) offer you this License
785     // giving you legal permission to copy, distribute and/or modify it.
786     //
787     // For the developers' and authors' protection, the GPL clearly explains
788     // that there is no warranty for this free software. For both users' and
789     // authors' sake, the GPL requires that modified versions be marked as
790     // changed, so that their problems will not be attributed erroneously to
791     // authors of previous versions.
792     //
793     // Some devices are designed to deny users access to install or run
794     // modified versions of the software inside them, although the manufacturer
795     // can do so. This is fundamentally incompatible with the aim of
796     // protecting users' freedom to change the software. The systematic
797     // pattern of such abuse occurs in the area of products for individuals to
798     // use, which is precisely where it is most unacceptable. Therefore, we
799     // have designed this version of the GPL to prohibit the practice for those
800     // products. If such problems arise substantially in other domains, we
801     // stand ready to extend this provision to those domains in future versions
802     // of the GPL, as needed to protect the freedom of users.
803     //
804     // Finally, every program is threatened constantly by software patents.
805     // States should not allow patents to restrict development and use of
806     // software on general-purpose computers, but in those that do, we wish to
807     // avoid the special danger that patents applied to a free program could
808     // make it effectively proprietary. To prevent this, the GPL assures that
809     // patents cannot be used to render the program non-free.
810     //
811     // The precise terms and conditions for copying, distribution and
812     // modification follow.
813     //
814     // TERMS AND CONDITIONS
815     //
816     // 0. Definitions.
817     //
818     // "This License" refers to version 3 of the GNU General Public License.
819     //
820     // "Copyright" also means copyright-like laws that apply to other kinds of
821     // works, such as semiconductor masks.
822     //
823     // "The Program" refers to any copyrightable work licensed under this
824     // License. Each licensee is addressed as "you". "Licensees" and
825     // "recipients" may be individuals or organizations.
826     //
827     // To "modify" a work means to copy from or adapt all or part of the work
828     // in a fashion requiring copyright permission, other than the making of an
829     // exact copy. The resulting work is called a "modified version" of the
830     // earlier work or a work "based on" the earlier work.
831     //
832     // A "covered work" means either the unmodified Program or a work based
833     // on the Program.
834     //
835     // To "propagate" a work means to do anything with it that, without
836     // permission, would make you directly or secondarily liable for
837     // infringement under applicable copyright law, except executing it on a
838     // computer or modifying a private copy. Propagation includes copying,
839     // distribution (with or without modification), making available to the
840     // public, and in some countries other activities as well.
841     //
842     // To "convey" a work means any kind of propagation that enables other
843     // parties to make or receive copies. Mere interaction with a user through
844     // a computer network, with no transfer of a copy, is not conveying.
845     //
846     // An interactive user interface displays "Appropriate Legal Notices"
847     // to the extent that it includes a convenient and prominently visible
848     // feature that (1) displays an appropriate copyright notice, and (2)
849     // tells the user that there is no warranty for the work (except to the
850     // extent that warranties are provided), that licensees may convey the
851     // work under this License, and how to view a copy of this License. If
852     // the interface presents a list of user commands or options, such as a
853     // menu, a prominent item in the list meets this criterion.
854     //
855     // 1. Source Code.
856     //
857     // The "source code" for a work means the preferred form of the work
858     // for making modifications to it. "Object code" means any non-source
859     // form of a work.
860     //
861     // A "Standard Interface" means an interface that either is an official
862     // standard defined by a recognized standards body, or, in the case of
863     // interfaces specified for a particular programming language, one that
864     // is widely used among developers working in that language.
865     //
866     // The "System Libraries" of an executable work include anything, other
867     // than the work as a whole, that (a) is included in the normal form of
868     // packaging a Major Component, but which is not part of that Major
869     // Component, and (b) serves only to enable use of the work with that
870     // Major Component, or to implement a Standard Interface for which an
871     // implementation is available to the public in source code form. A
872     // "Major Component", in this context, means a major essential component
873     // (kernel, window system, and so on) of the specific operating system
874     // (if any) on which the executable work runs, or a compiler used to
875     // produce the work, or an object code interpreter used to run it.
876     //
877     // The "Corresponding Source" for a work in object code form means all
878     // the source code needed to generate, install, and (for an executable
879     // work) run the object code and to modify the work, including scripts to
880     // control those activities. However, it does not include the work's
881     // System Libraries, or general-purpose tools or generally available free
882     // programs which are used unmodified in performing those activities but
883     // which are not part of the work. For example, Corresponding Source
884     // includes interface definition files associated with source files for
885     // the work, and the source code for shared libraries and dynamically
886     // linked subprograms that the work is specifically designed to require,
887     // such as by intimate data communication or control flow between those
888     // subprograms and other parts of the work.
889     //
890     // The Corresponding Source need not include anything that users
891     // can regenerate automatically from other parts of the Corresponding
892     // Source.
893     //
894     // The Corresponding Source for a work in source code form is that
895     // same work.
896     //
897     // 2. Basic Permissions.
898     //
899     // All rights granted under this License are granted for the term of
900     // copyright on the Program, and are irrevocable provided the stated
901     // conditions are met. This License explicitly affirms your unlimited
902     // permission to run the unmodified Program. The output from running a
903     // covered work is covered by this License only if the output, given its
904     // content, constitutes a covered work. This License acknowledges your
905     // rights of fair use or other equivalent, as provided by copyright law.
906     //
907     // You may make, run and propagate covered works that you do not
908     // convey, without conditions so long as your license otherwise remains
909     // in force. You may convey covered works to others for the sole purpose
910     // of having them make modifications exclusively for you, or provide you
911     // with facilities for running those works, provided that you comply with
912     // the terms of this License in conveying all material for which you do
913     // not control copyright. Those thus making or running the covered works
914     // for you must do so exclusively on your behalf, under your direction
915     // and control, on terms that prohibit them from making any copies of
916     // your copyrighted material outside their relationship with you.
917     //
918     // Conveying under any other circumstances is permitted solely under
919     // the conditions stated below. Sublicensing is not allowed; section 10
920     // makes it unnecessary.
921     //
922     // 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
923     //
924     // No covered work shall be deemed part of an effective technological
925     // measure under any applicable law fulfilling obligations under article
926     // 11 of the WIPO copyright treaty adopted on 20 December 1996, or
927     // similar laws prohibiting or restricting circumvention of such
928     // measures.
929     //
930     // When you convey a covered work, you waive any legal power to forbid
931     // circumvention of technological measures to the extent such circumvention
932     // is effected by exercising rights under this License with respect to
933     // the covered work, and you disclaim any intention to limit operation or
934     // modification of the work as a means of enforcing, against the work's
935     // users, your or third parties' legal rights to forbid circumvention of
936     // technological measures.
937     //
938     // 4. Conveying Verbatim Copies.
939     //
940     // You may convey verbatim copies of the Program's source code as you
941     // receive it, in any medium, provided that you conspicuously and
942     // appropriately publish on each copy an appropriate copyright notice;
943     // keep intact all notices stating that this License and any
944     // non-permissive terms added in accord with section 7 apply to the code;
945     // keep intact all notices of the absence of any warranty; and give all
946     // recipients a copy of this License along with the Program.
947     //
948     // You may charge any price or no price for each copy that you convey,
949     // and you may offer support or warranty protection for a fee.
950     //
951     // 5. Conveying Modified Source Versions.
952     //
953     // You may convey a work based on the Program, or the modifications to
954     // produce it from the Program, in the form of source code under the
955     // terms of section 4, provided that you also meet all of these conditions:
956     //
957     // a) The work must carry prominent notices stating that you modified
958     // it, and giving a relevant date.
959     //
960     // b) The work must carry prominent notices stating that it is
961     // released under this License and any conditions added under section
962     // 7. This requirement modifies the requirement in section 4 to
963     // "keep intact all notices".
964     //
965     // c) You must license the entire work, as a whole, under this
966     // License to anyone who comes into possession of a copy. This
967     // License will therefore apply, along with any applicable section 7
968     // additional terms, to the whole of the work, and all its parts,
969     // regardless of how they are packaged. This License gives no
970     // permission to license the work in any other way, but it does not
971     // invalidate such permission if you have separately received it.
972     //
973     // d) If the work has interactive user interfaces, each must display
974     // Appropriate Legal Notices; however, if the Program has interactive
975     // interfaces that do not display Appropriate Legal Notices, your
976     // work need not make them do so.
977     //
978     // A compilation of a covered work with other separate and independent
979     // works, which are not by their nature extensions of the covered work,
980     // and which are not combined with it such as to form a larger program,
981     // in or on a volume of a storage or distribution medium, is called an
982     // "aggregate" if the compilation and its resulting copyright are not
983     // used to limit the access or legal rights of the compilation's users
984     // beyond what the individual works permit. Inclusion of a covered work
985     // in an aggregate does not cause this License to apply to the other
986     // parts of the aggregate.
987     //
988     // 6. Conveying Non-Source Forms.
989     //
990     // You may convey a covered work in object code form under the terms
991     // of sections 4 and 5, provided that you also convey the
992     // machine-readable Corresponding Source under the terms of this License,
993     // in one of these ways:
994     //
995     // a) Convey the object code in, or embodied in, a physical product
996     // (including a physical distribution medium), accompanied by the
997     // Corresponding Source fixed on a durable physical medium
998     // customarily used for software interchange.
999     //
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1278     //
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1283     // 12. No Surrender of Others' Freedom.
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1295     // 13. Use with the GNU Affero General Public License.
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1306     // 14. Revised Versions of this License.
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1334     // THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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1350     // DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
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1353     // SUCH DAMAGES.
1354     //
1355     // 17. Interpretation of Sections 15 and 16.
1356     //
1357     // If the disclaimer of warranty and limitation of liability provided
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1359     // reviewing courts shall apply local law that most closely approximates
1360     // an absolute waiver of all civil liability in connection with the
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1362     // copy of the Program in return for a fee.
1363     //--------------------------------------------------------------------------------
1364     //C O N F I G U R A T I O N
1365     //--------------------------------------------------------------------------------
1366     //Configuration switch combinations were not tested. E-mail me any program
1367     //corrections (dashley@gmail.com).
1368     define ("CFG_PROGNAME", "thumbnails_make.php");
1369     //Number of characters per line preferred for console output.
1370     define ("CFG_CONSOLE_STD_LINE_LEN", 78);
1371     //Number of characters per line preferred for console output.
1372     define ("CFG_THUMBNAIL_DIMENSION_MAX", 125);
1373     //The maximum dimension of the created thumbnails. Thumbnails are sized so
1374     //that the longest dimension is this many pixels.
1375     define ("CFG_THUMBNAIL_BEVELED_BORDER_WIDTH", 4);
1376     //The number of pixels that the thumbnail beveled borders should be.
1377     define ("CFG_THUMBNAIL_FILENAME_SUFFIX", "_small");
1378     //String added just before the filename extension to choose thumbnail names
1379     //based on name of full-sized image.
1380     define ("CFG_LANCZOS_FILTER_APPLY", FALSE);
1381     //TRUE if should apply the Lanczos filter when making the thumbnail, FALSE
1382     //otherwise. I have no idea if using a Lanczos filter improves the quality
1383     //of the thumbnails, but the filter was applied in the PHP example I found
1384     //online. Applying the Lanczos filter typically adds a few seconds to the
1385     //time required to create each thumbnail.
1386     define ("CFG_MAX_THUMBNAILS_PER_INVOCATION", 20);
1387     //The maximum number of thumbnails that should be created per invocation.
1388     //This is to prevent the program from being involuntarily terminated
1389     //for taking too much CPU time.
1390     //--------------------------------------------------------------------------------
1391     //Calculates important integer indices related to creating a thumbnail, in order
1392     //to minimize distortion in the thumbnail.
1393     //
1394     //When creating a thumbnail, the longer side may be relatively short (perhaps
1395     //100 pixels), and the shorter side may be even shorter (perhaps even as short
1396     //as 10 pixels). If the dimensions of the original image were not changed,
1397     //converting the image to a thumbnail may result in distortion of up to about
1398     //one percent. As an example, suppose that a 1600 x 900 image is converted to a
1399     //thumbnail with the longer side of 125 pixels. The ideal dimension for the
1400     //shorter side would be (900/1600) * 125 = 70.3125 pixels. The aspect ratio of
1401     //the thumbnail can't be made to match the aspect ratio of the original image.
1402     //
1403     //To avoid any aspect ratio distortion that might be noticeable, this program
1404     //chooses the shorter dimension for the thumbnail that is the ceiling of the actual
1405     //quotient, then crops the longer dimension of the original image before the
1406     //conversion to try and match the aspect ratios as closely as possible.
1407     //
1408     //In the example a paragraph or two above, the shorter side of the thumbnail
1409     //would be chosen to be 71 pixels.
1410     //
1411     //Once this choice is made, we want to trim the original image before conversion
1412     //so that n/900 is as close as possible to 125/71. n = (900 * 125) / 71 =
1413     //1584.5070 pixels, so we choose 1585. This keeps the aspect ratio of the
1414     //original image and the thumbnail as close as possible.
1415     //
1416     //Although the longer side of the original image may be reduced prior to the
1417     //conversion to a thumbnail, this information is not written to disk, and
1418     //the original image is not modified. The adjustment of the longer side is
1419     //just a conversion trick to hopefully get better thumbnails.
1420     function calc_thumbnail_conversion_pars
1421     (
1422     $in_orig_longer,
1423     //Longer dimension of original image.
1424     $in_orig_shorter,
1425     //Shorter dimension of original image.
1426     $in_thumbnail_longer,
1427     //Longer dimension of desired thumbnail.
1428     & $out_thumbnail_longer,
1429     //Longer dimension of thumbnail that should be created.
1430     & $out_thumbnail_shorter,
1431     //Shorter dimension of thumbnail that should be created.
1432     & $out_orig_crop_dim_longer,
1433     //The size to crop to on the longer axis of the original.
1434     & $out_orig_crop_dim_shorter,
1435     //The size to crop to on the shorter axis of the original.
1436     & $out_orig_crop_start_longer,
1437     //For use with the Imagick:cropImage() method, the start
1438     //position of the crop on the longer axis.
1439     & $out_orig_crop_start_shorter
1440     //For use with the Imagick:cropImage() method, the start
1441     //position of the crop on the shorter axis.
1442     )
1443     {
1444     //Set the thumbnail shorter dimension to the floor. This means would need to trim
1445     //longest dimension of original to match aspect ratio as closely as possible.
1446     $out_thumbnail_longer = $in_thumbnail_longer;
1447     $out_thumbnail_shorter = ceil(((float)$in_thumbnail_longer *
1448     (float)$in_orig_shorter) / (float)$in_orig_longer);
1449     settype($out_thumbnail_shorter, "integer");
1450    
1451     //The aspect ratio of the thumbnail is now set. Try to match the aspect ratio of the larger
1452     //image as closely as possible by selecting a smaller number for the long axis of the
1453     //original image.
1454     $out_orig_crop_dim_longer = round(((float)$in_thumbnail_longer *
1455     (float)$in_orig_shorter) / (float)$out_thumbnail_shorter);
1456     settype($out_orig_crop_dim_longer, "integer");
1457    
1458     //The original keeps its shorter dimension unchanged.
1459     $out_orig_crop_dim_shorter = $in_orig_shorter;
1460    
1461     //Set the cropping of the longer side of the original to cover half the necessary
1462     //reduction.
1463     $out_orig_crop_start_longer = round(((float)$in_orig_longer -
1464     (float)$out_orig_crop_dim_longer) / 2.0);
1465     settype($out_orig_crop_start_longer, "integer");
1466    
1467     //No cropping of original shorter side.
1468     $out_orig_crop_start_shorter = 0;
1469     }
1470     //--------------------------------------------------------------------------------
1471     //Repeats a character to the console output a certain number of times.
1472     function rep_char_con($c, $n)
1473     {
1474     while ($n--)
1475     echo $c;
1476     }
1477     //--------------------------------------------------------------------------------
1478     //Writes a standard thick horizontal line to the console.
1479     function hor_line_thick()
1480     {
1481     rep_char_con("=", CFG_CONSOLE_STD_LINE_LEN);
1482     echo "\n";
1483     }
1484     //--------------------------------------------------------------------------------
1485     //Writes a standard thin horizontal line to the console.
1486     function hor_line_thin()
1487     {
1488     rep_char_con("-", CFG_CONSOLE_STD_LINE_LEN);
1489     echo "\n";
1490     }
1491     //--------------------------------------------------------------------------------
1492     //Returns an array of all files in the working directory.
1493     //If no files can be found, returns FALSE.
1494     function get_file_names_in_dir()
1495     {
1496     //Get directory list.
1497     $rv = scandir (".");
1498    
1499     //If the list is empty, something went wrong. Return FALSE.
1500     if ($rv === FALSE)
1501     return FALSE;
1502    
1503     return $rv;
1504     }
1505     //--------------------------------------------------------------------------------
1506     //Returns TRUE if a file name appears to be a valid full-sized image name,
1507     //or FALSE otherwise.
1508     function is_full_sized_image_file_name($in_filename)
1509     {
1510     //Convert the string name to all lower case. This will do for
1511     //comparisons and tests.
1512     $s = strtolower($s);
1513    
1514     //Attempt to split the name into a base and an extension. Any failure
1515     //means it is an unsuitable name.
1516     $extension_start = strrpos($in_filename, ".");
1517     //Find position of last "." in string. This should precede the
1518     //file extension.
1519    
1520     if ($extension_start === FALSE)
1521     {
1522     //Bad name. Unsuitable.
1523     return FALSE;
1524     }
1525    
1526     //Calculate the base and extension.
1527     $filename_base = substr($in_filename, 0, $extension_start);
1528     $filename_extension = substr($in_filename, $extension_start + 1);
1529    
1530     //If the extension is neither "jpg" nor "jpeg", it is unsuitable.
1531     if (($filename_extension != "jpg") && ($filename_extension != "jpeg"))
1532     return FALSE;
1533    
1534     //If the filename base is empty, the filename is unsuitable.
1535     if (strlen($filename_base) == 0)
1536     return FALSE;
1537    
1538     //If the last characters of the base are the CFG_THUMBNAIL_FILENAME_SUFFIX,
1539     //the name is unsuitable.
1540     if (strlen($filename_base) >= strlen(CFG_THUMBNAIL_FILENAME_SUFFIX))
1541     {
1542     if (substr($filename_base, strlen($filename_base) - strlen(CFG_THUMBNAIL_FILENAME_SUFFIX))
1543     == CFG_THUMBNAIL_FILENAME_SUFFIX)
1544     return FALSE;
1545     }
1546    
1547     //Looks good.
1548     return TRUE;
1549     }
1550     //--------------------------------------------------------------------------------
1551     //As a function of the file name, creates the file name for the thumbnail.
1552     function file_name_to_thumbnail_name($in_filename)
1553     {
1554     $extension_start = strrpos($in_filename, ".");
1555     //Find position of last "." in string. This should precede the
1556     //file extension.
1557     if ($extension_start === FALSE)
1558     {
1559     //"." not found. Should not happen. Filenames were checked in advance.
1560     echo "Fatal internal error at line " . __LINE__ . "\n";
1561     exit(1);
1562     }
1563    
1564     $filename_prefix = substr($in_filename, 0, $extension_start);
1565     $filename_extension = substr($in_filename, $extension_start);
1566    
1567     $rv = $filename_prefix . CFG_THUMBNAIL_FILENAME_SUFFIX . $filename_extension;
1568    
1569     return $rv;
1570     }
1571     //--------------------------------------------------------------------------------
1572     //Actually creates the thumbnail, and returns some information about what was
1573     //done.
1574     //
1575     //The calls to the ImagMagick library take on the order of 5s per image if there
1576     //is filtering.
1577     function create_thumbnail( $in_filename,
1578     $in_thumbnailname,
1579     & $out_filename_filesize,
1580     & $out_filename_xdim,
1581     & $out_filename_ydim,
1582     & $out_thumbnailname_filesize,
1583     & $out_thumbnailname_xdim,
1584     & $out_thumbnailname_ydim)
1585     {
1586     //Assign output parameters just in case something doesn't get assigned.
1587     $out_filename_filesize = 0;
1588     $out_filename_xdim = 0;
1589     $out_filename_ydim = 0;
1590     $out_thumbnailname_filesize = 0;
1591     $out_thumbnailname_xdim = 0;
1592     $out_thumbnailname_ydim = 0;
1593    
1594     //Establish target dimensions. Two cases, depending on which is the longer
1595     //side.
1596    
1597     //Construct.
1598     $imagick = new Imagick();
1599    
1600     //Load image.
1601     $imagick->readImage($in_filename);
1602    
1603     //Get the dimensions of the image we just loaded.
1604     $geo = $imagick->getImageGeometry();
1605     $out_filename_xdim = $geo['width'];
1606     $out_filename_ydim = $geo['height'];
1607    
1608     //Calculate target sizes. We rearrange parameters based on which is our
1609     //longest side.
1610     if ($out_filename_xdim >= $out_filename_ydim)
1611     {
1612     //Longer width (x-dimension), or square.
1613     calc_thumbnail_conversion_pars
1614     (
1615     $out_filename_xdim,
1616     $out_filename_ydim,
1617     CFG_THUMBNAIL_DIMENSION_MAX,
1618     $out_thumbnailname_xdim,
1619     $out_thumbnailname_ydim,
1620     $orig_crop_dim_x,
1621     $orig_crop_dim_y,
1622     $orig_crop_start_x,
1623     $orig_crop_start_y
1624     );
1625     }
1626     else
1627     {
1628     //Longer height (y-dimension).
1629     calc_thumbnail_conversion_pars
1630     (
1631     $out_filename_ydim,
1632     $out_filename_xdim,
1633     CFG_THUMBNAIL_DIMENSION_MAX,
1634     $out_thumbnailname_ydim,
1635     $out_thumbnailname_xdim,
1636     $orig_crop_dim_y,
1637     $orig_crop_dim_x,
1638     $orig_crop_start_y,
1639     $orig_crop_start_x
1640     );
1641     }
1642    
1643     //For debugging only, might want to know intermediate calculation results.
1644     //echo "xcropdim, ycropdim, xcropstart, ycropstart: "
1645     // .
1646     // $orig_crop_dim_x
1647     // .
1648     // " "
1649     // .
1650     // $orig_crop_dim_y
1651     // .
1652     // " "
1653     // .
1654     // $orig_crop_start_x
1655     // .
1656     // " "
1657     // .
1658     // $orig_crop_start_y
1659     // .
1660     // "\n";
1661    
1662     //Crop the original to try to preserve the aspect ratio of the thumbnail
1663     //as precisely as possible.
1664     $imagick->cropImage(
1665     $orig_crop_dim_x,
1666     $orig_crop_dim_y,
1667     $orig_crop_start_x,
1668     $orig_crop_start_y
1669     );
1670    
1671     //For debugging only, might want to get a look at the cropped image, to
1672     //be sure nothing unexpected happens on the canvas.
1673     //$imagick->writeImage($in_filename . ".cropped.jpg");
1674    
1675     //Resize to thumbnail size.
1676     if (CFG_LANCZOS_FILTER_APPLY)
1677     {
1678     $imagick->resizeImage($out_thumbnailname_xdim,
1679     $out_thumbnailname_ydim,
1680     Imagick::FILTER_LANCZOS,
1681     1);
1682     }
1683     else
1684     {
1685     $imagick->resizeImage($out_thumbnailname_xdim,
1686     $out_thumbnailname_ydim,
1687     0,
1688     1);
1689     }
1690    
1691     //Create the border.
1692     $imagick->raiseImage(CFG_THUMBNAIL_BEVELED_BORDER_WIDTH,
1693     CFG_THUMBNAIL_BEVELED_BORDER_WIDTH,
1694     0,
1695     0,
1696     1);
1697    
1698     //Set compression to get a smaller thumbnail written, and strip
1699     //header information. stripImage() seems to have the largest effect
1700     //on thumbnail file size, so leaving the thumbnail quality near 100%
1701     //is feasible. The jump in file size between 90% and 95% seemed to be
1702     //fairly large (40% to 50%), so I left it at 90%. My rationale is
1703     //that with the proliferation of mobile devices and cellular data,
1704     //getting the thumbnail as small as possible is more important than
1705     //the thumbnail looking perfect. If the viewer wants a perfect image,
1706     //they can view the full-sized image.
1707     $imagick->setImageCompression(Imagick::COMPRESSION_JPEG);
1708     $imagick->setImageCompressionQuality(90);
1709     $imagick->stripImage();
1710    
1711     //Write the thumbnail.
1712     $imagick->writeImage($in_thumbnailname);
1713    
1714     //Destroy to prevent memory leak.
1715     $imagick->clear();
1716     $imagick->destroy();
1717    
1718     //All of the writing is done. Try to obtain the file sizes.
1719     $fsize = filesize($in_filename);
1720     if ($fsize !== FALSE)
1721     $out_filename_filesize = $fsize;
1722     $fsize = filesize($in_thumbnailname);
1723     if ($fsize !== FALSE)
1724     $out_thumbnailname_filesize = $fsize;
1725     }
1726     //--------------------------------------------------------------------------------
1727     //Write introductory message.
1728     hor_line_thick();
1729     echo CFG_PROGNAME . " Copyright (C) 2015 David T. Ashley\n";
1730     echo "This program comes with ABSOLUTELY NO WARRANTY; and is licensed under\n";
1731     echo "the GNU General Public License, Version 3. A copy of this license is\n";
1732     echo "provided in the source code of this program.\n";
1733     hor_line_thin();
1734     //-----------------------------------------------------------------------------
1735     //Get and emit the names of everything in the directory.
1736     $file_list = get_file_names_in_dir();
1737     if ($file_list === FALSE)
1738     {
1739     echo "List of files from PHP function scandir() is empty.\n";
1740     echo "Serious internal error, or nothing to do. Script cannot continue.\n";
1741     hor_line_thick();
1742     exit(1);
1743     }
1744     else
1745     {
1746     echo "Files in working directory (unsorted, unfiltered, "
1747     .
1748     count($file_list)
1749     .
1750     " files):\n";
1751     for ($i = 0; $i < count($file_list); $i++)
1752     echo " " . sprintf("[%5d]", $i) . " " . $file_list[$i] . "\n";
1753     }
1754     hor_line_thin();
1755     //-----------------------------------------------------------------------------
1756     //Remove the standard directory entries "." and ".." from the list, and
1757     //remove any directories.
1758     $temp_list = $file_list;
1759     unset($file_list);
1760     $n = 0;
1761     for ($i = 0; $i < count($temp_list); $i++)
1762     {
1763     //echo "Checking " . $temp_list[$i] . "\n";
1764    
1765     if (strcmp($temp_list[$i], ".") == 0)
1766     {
1767     //. entry, not a file.
1768     }
1769     else if (strcmp($temp_list[$i], "..") == 0)
1770     {
1771     //.. entry, not a file.
1772     }
1773     else if (is_file($temp_list[$i]))
1774     {
1775     //This is a regular file.
1776     $file_list[] = $temp_list[$i];
1777     $n++;
1778     }
1779     }
1780    
1781     if ($n == 0)
1782     $file_list = FALSE;
1783    
1784     unset($n);
1785     unset($temp_list);
1786     //-----------------------------------------------------------------------------
1787     //If there is nothing to do, end the script.
1788     if ($file_list === FALSE)
1789     {
1790     echo "No files to process.\n";
1791     hor_line_thick();
1792     exit(0);
1793     }
1794     //-----------------------------------------------------------------------------
1795     //Sort the list. This is a non-event. The only rationale for sorting is that
1796     //it ensures that the same set of files will be processed in the same order,
1797     //regardless of the order provided by the underlying OS internals.
1798     sort($file_list);
1799     //-----------------------------------------------------------------------------
1800     //Emit the names we now have.
1801     echo "Files in working directory (directory entries removed, sorted, "
1802     .
1803     count($file_list)
1804     .
1805     " files):\n";
1806     for ($i = 0; $i < count($file_list); $i++)
1807     echo " " . sprintf("[%5d]", $i) . " " . $file_list[$i] . "\n";
1808     hor_line_thin();
1809    
1810     //-----------------------------------------------------------------------------
1811     //For each file that is appropriate and where the thumbnail does not already
1812     //exist, up to the maximum we may do in one invocation, create the thumbnail.
1813     $i = 0;
1814     $completed = 0;
1815     while (($completed < CFG_MAX_THUMBNAILS_PER_INVOCATION) && ($i < count($file_list)))
1816     {
1817     if (is_full_sized_image_file_name($file_list[$i]))
1818     {
1819     $thumbnail_name = file_name_to_thumbnail_name($file_list[$i]);
1820    
1821     if (file_exists($thumbnail_name))
1822     {
1823     echo " " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : skipping because corresponding thumbnail exists.\n";
1824     hor_line_thin();
1825     }
1826     else
1827     {
1828     echo " " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : creating thumbnail.\n";
1829    
1830     echo "Creating thumbnail \"" .
1831     $thumbnail_name .
1832     "\" from image \"" .
1833     $file_list[$i] .
1834     "\".\n";
1835    
1836     create_thumbnail($file_list[$i],
1837     $thumbnail_name,
1838     $filename_filesize,
1839     $filename_xdim,
1840     $filename_ydim,
1841     $thumbnail_filesize,
1842     $thumbnail_xdim,
1843     $thumbnail_ydim);
1844    
1845     echo "Conversion complete.\n";
1846     echo " Full-sized image file size/xdim/ydim = " .
1847     $filename_filesize . "/" . $filename_xdim . "/" . $filename_ydim .
1848     ",\n";
1849     echo " Thumbnail image filesize/xdim/ydim = " .
1850     $thumbnail_filesize . "/" . $thumbnail_xdim . "/" . $thumbnail_ydim .
1851     ",\n";
1852    
1853     hor_line_thin();
1854     $completed++;
1855     }
1856     }
1857     else
1858     {
1859     //Unsuitable base name. Can't use it.
1860     echo " " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : skipping due to unsuitable name.\n";
1861     hor_line_thin();
1862     }
1863    
1864     $i++;
1865     }
1866    
1867     //Emit a message about whether the program should be run again. I am aware of
1868     //the uncovered case--where the last thumbnail was made on the last iteration
1869     //of this invocation--but I will leave it uncovered for now. All that happens
1870     //is the user runs the program unnecessarily one more time.
1871     if ($completed == 0)
1872     {
1873     echo "No thumbnails were created--this program is done creating thumbnails.\n";
1874     echo "It is not necessary to run this program again.\n";
1875     hor_line_thin();
1876     }
1877     else
1878     {
1879     echo $completed . " thumbnail(s) were created. Please run this program repeatedly again\n";
1880     echo "until no more thumbnails are created.\n";
1881     hor_line_thin();
1882     }
1883    
1884     echo CFG_PROGNAME . " execution ends.\n";
1885     hor_line_thick();
1886     //--------------------------------------------------------------------------------
1887     //End of File
1888     //--------------------------------------------------------------------------------
1889     ?>

dashley@gmail.com
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