Image::Size - Determine the size of images in several common formats Version: 2.8 (See CHANGE HISTORY below) WHAT IS IT Image::Size is a library based on the image-sizing code in the wwwimagesize script, a tool that analyzes HTML files and adds HEIGHT and WIDTH tags to IMG directives. Image::Size has generalized that code to return a raw (X, Y) pair, and included wrappers to pre-format that output into either HTML or a set of attribute pairs suitable for the CGI.pm library by Lincoln Stein. Currently, Image::Size can size images in XPM, XBM, GIF, JPEG, PNG, TIFF and the PPM family of formats (PPM/PGM/PBM). I did this because my old WWW server generated a lot of documents on demand rather than keeping them in static files. These documents not only used directional icons and buttons, but other graphics to annotate and highlight sections of the text. Without size attributes, browsers cannot render the text of a page until the image data is loaded and the size known for layout. This library enables scripts to size their images at run-time and include that as part of the generated HTML. Or for any other utility that uses and manipulates graphics. The idea of the basic interface + wrappers is to not limit the programmer to a certain data format. USING Image::Size IN YOUR SCRIPTS Image::Size has pod documentation that gives a more complete overview, but in a nutshell: use Image::Size; ($x, $y) = imgsize("something.gif"); And ($x, $y) is now the width and height of something.gif. 95% of my usage of this library is in conjunction with Lincoln Stein's CGI.pm: use CGI ':all'; use Image::Size 'attr_imgsize'; # # Emit an IMG tag with size attributes: # print img({-SRC => '/server/images/arrow.gif', attr_imgsize('/server_root/server/images/arrow.gif')}); BUILDING/INSTALLING This package is set up to configure and build like a typical Perl extension. To build: perl Makefile.PL make && make test If Image::Size passes all tests, then: make install You may need super-user access to install. PROBLEMS/BUG REPORTS Please send any reports of problems or bugs to rjray@tsoft.com. CREDITS AND LICENSES This package is copyright © 1996,1998 by Randy Ray (rjray@tsoft.com) and may be distributed under terms of the Artistic License used to cover Perl itself. See the file Artistic in the distribution of Perl 5.002 or later for details of copy and distribution terms. Perl module interface by Randy J. Ray (rjray@tsoft.com), original image-sizing code by Alex Knowles (alex@ed.ac.uk) and Andrew Tong (werdna@ugcs.caltech.edu), used with their joint permission. Some bug fixes submitted by Bernd Leibing . PPM/PGM/PBM sizing code contributed by Carsten Dominik . Tom Metro re-wrote the JPG and PNG code, and also provided a PNG image for the test suite. Dan Klein contributed a re-write of the GIF code. Cloyce Spradling contributed the TIFF sizing code and test images. A fix for reading binary data on PC-ish operating systems was contributed by Silas Dunsmore . Aldo Calpini sent in code that was easily adapted to support BMP images (Windows bitmaps). CHANGE HISTORY This is version 2.8: * Added support for BMP-format files. CR/LF translation between UNIX and Windows machines should not affect this, but please let me know if there are problems. Initial version 1.0: * Library model for sizing code from wwwimagesize. By this, I also include the extension-style infrastructure, MakeMaker usage, test suite, etc. * Changed format of returned data to generic (X, Y), added wrappers to format into "WIDTH=x HEIGHT=y" HTML-style and (-WIDTH => x, -HEIGHT => y) CGI-style. * Added cacheing of sizes based on passed-in file name. I have one CGI script that uses a given icon for a bullet list, with 35+ items in the list... * UNDOCUMENTED UNTIL BETTER TESTED: Optional second argument to imgsize can be either scalar or a code ref; if scalar, is pasted in front of file name as a directory component; if it is a code ref, the routine is called with the file name as a single argument and is expected to return the full path name. Kind of clunky right now, easier to just pass in the full path to begin with. * Added the XPM sizing myself, though I have yet to use it (I do test it in the test suite, though). Changes in 1.1: * Added a small, simple script called "imgsize" that gives command-line access to the library functionality. * Discovered and fixed bug in sizing JPEGs. Changes in 1.2: Two fixes given to me by Bernd Leibing : * Fixed bug caused by perl quoting and RCS in Size.pm * imgsize now comes as imgsize.PL and is auto-extracted as part of the make, utilizing your system's configuration to create the start-up #! line. Changes in 2.0: * No longer uses filenames to determine image format for examination. * Can operate on already-open IO::File objects. * Can operate on in-memory data strings (buffers). * Documentation overhauled. * imgsize() now returns an ignorable third parameter. This value is a three- letter identifier of the image format (using the standard suffixes. Useful when sizing unknown data to also type the image. * Support for the PPM family (PPM, PGM and PBM) of formats. * JPG code extensively re-written and simplified. * PNG code re-written. * Test cases for PNG and PPM added. Test cases also cover the open-file and in-memory capabilities. * Dropped the "optional second argument" thing in the invocation; no one used it, and it was confusing and difficult to explain clearly. * Various typos cleaned up. Changes in 2.1: * Added in changes to the error handling that were meant for 2.0. * Fixed a bug in attr_imgsize caused by the new return format. Changes in 2.2: * Added calls to binmode on filehandles, for the sake of OS flavors such as OS/2, etc. * Cleaned up a new -w warning present in late versions of 5.003 (leading in to 5.004). Changes in 2.3: * Small fix to the regular expression in xpmsize. * Changed syntax of utilizing AutoLoader to conform to changes in upcoming 5.004 release. Changes in 2.4: * Small bug in jpegsize, not returning the string 'JPG' as the third element of the returned list. Figures I have a half-documented feature, and someone actually uses it. :-) Changes in 2.5: * Added support for TIFF images and two test cases. Many thanks to Cloyce Spradling for both the code patches and the test images. Changes in 2.6: * 2.5 did not actually deliver the tests for the new TIFF code. Oops. * Found some variations of the formats of XPM and XBM that were not compatible with the regex's being used. Tricky, flexible little devils, especially XPM. Changes in 2.7: * Corrected numerous documentation bugs in which I repeatedly referred to the X and Y dimensions in the wrong order. This was pointed out by several people, but I also kept forgetting to attend to it. * The base routine imgsize now returns a null list when called in a void or scalar context. Mainly, I like pre-loading the cache under mod_perl in Apache (so that spawned children inherit the cache) and didn't like the idea of all those calls populating a stack that was then ignored.