ID: 24844 Updated by: [EMAIL PROTECTED] Reported By: e9925248 at stud4 dot tuwien dot ac dot at -Status: Analyzed +Status: Bogus Bug Type: GD related Operating System: Windows 2000 PHP Version: 4.3.3RC2-dev 5.0.0b2 New Comment:
Not PHP bug. Previous Comments: ------------------------------------------------------------------------ [2003-07-28 13:07:24] [EMAIL PROTECTED] Actually my inital comment was not entirely correct, we do support 'read' functionality for gif, but no write support. However, GD extension itself is not thread-safe due to other libraries that is it using. ------------------------------------------------------------------------ [2003-07-28 09:48:28] [EMAIL PROTECTED] Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Thank you for your interest in PHP. GD distributed with PHP does not support GIFs due to UNISYS patents on the compression format used by GIF. ------------------------------------------------------------------------ [2003-07-28 09:45:20] e9925248 at stud4 dot tuwien dot ac dot at Description: ------------ If mod_php4 (precompiled from the web page), with php_gd2.dll extension loaded, is used in Apache/1.3.27 on Windows 2000, createimagefromgif returns black images or only parts of the image, if some pages call it at the same time. For example: <?php header ("Content-type: image/jpeg"); $im="image.gif"; $im1=imagecreatefromgif($im); imagejpeg($im1); ?> image.gif can be any gif, some KBs big. Run in many terminal then something like while /bin/true; do wget "http://server/skript.php";; done only a part of the saved images will be ok. If only one images is fetched at a time, all images are ok. If the skript is used by many users, web browsers also show black images or parts of the image. I think, the error is in the bundled libgd, in gd_gif_in.c. There global and static variables are used to read the gif, which all threads seem to share. Removing them and storing them in a per Request state, seems to solve the problem for me. An example patch, which works for me, is at: http://stud4.tuwien.ac.at/~e9925248/php/gd-gif.diff Martin K�gler [EMAIL PROTECTED] Reproduce code: --------------- <?php header ("Content-type: image/jpeg"); $im="image.gif"; $im1=imagecreatefromgif($im); imagejpeg($im1); ?> Expected result: ---------------- The gif-image as jpeg Actual result: -------------- If some users use the script at the same time, the image has black parts. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=24844&edit=1
