Bug #79676 [NEW]: imagescale adds black border with IMG_BICUBIC

From: rubik99 at pokemail dot net Operating system: Irrelevant PHP version: Irrelevant Package: GD related Bug Type: Bug Bug description:imagescale adds black border with IMG_BICUBIC Description: ------------ imagescale adds a bottom and right black border if the mode used is IMG_BICUBIC This is dependant on the GD version not PHP version GD versions that fail: The official Windows php.exe (7.4.5) uses GD "bundled (2.1.0 compatible)" The official Windows php.exe (7.2.30) uses GD "bundled (2.1.0 compatible)" http://phpfiddle.org/ (PHP 7.1.18) uses GD "bundled (2.1.0 compatible)" One of my site hosts (PHP 7.0.33) uses GD "bundled (2.1.0 compatible)" GD versions that pass: https://rextester.com/ (PHP 7.2.24) uses GD 2.2.5 https://paiza.io/ (PHP 7.4.1) uses GD 2.2.5 https://www.tutorialspoint.com/ (PHP 7.1.8) uses GD 2.2.4 LibGD 2.3.0 (March 2020) contains security fixes PHP 7.4.5 source file "ext/gd/libgd/gd.h" defines GD version as 2.0.35 (<=2015) Test script: --------------- function test($image, $desc) { echo $desc . ' - Test Result: ' . (imagecolorat($image, imagesx($image) - 1 , imagesy($image) - 1) != 0x000000 ? 'pass' : 'fail') . '<br>'; //line below displays image //ob_start(); imagepng($image); $imageString = ob_get_clean();echo '<img src="data:image/png;base64, ' . base64_encode($imageString) . '" /><br><br>'; } echo 'PHP: ' . phpversion(). ' GD: ' . gd_info()["GD Version"] . '<br>'; $size = 32; $src = imagecreatetruecolor($size, $size); imagefilledrectangle($src, 0, 0, $size - 1 , $size - 1, 0xff00ff);//magenta test($src, 'No scaling'); test(imagescale($src, $size * 2, $size * 2), 'Scale 200%, default mode'); test(imagescale($src, $size / 2, $size / 2), 'Scale 50%, default mode'); test(imagescale($src, $size * 2, $size * 2, IMG_BICUBIC), 'Scale 200%, IMG_BICUBIC mode'); test(imagescale($src, $size / 2, $size / 2, IMG_BICUBIC), 'Scale 50%, IMG_BICUBIC mode'); -- Edit bug report at https://bugs.php.net/bug.php?id=79676&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79676&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79676&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79676&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79676&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79676&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79676&r=support Expected behavior: https://bugs.php.net/fix.php?id=79676&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79676&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79676&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79676&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79676&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79676&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79676&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79676&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79676&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79676&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79676&r=mysqlcfg