Bug #77700 [Asn->Csd]: Writing truecolor images as GIF ignores interlace flag

Edit report at https://bugs.php.net/bug.php?id=77700&edit=1 ID: 77700 Updated by: cmb@php.net Reported by: cmb@php.net Summary: Writing truecolor images as GIF ignores interlace flag -Status: Assigned +Status: Closed Type: Bug Package: GD related Operating System: * PHP Version: 7.2Git-2019-03-05 (Git) Assigned To: cmb Block user comment: N Private report: N New Comment: Automatic comment on behalf of cmbecker69@gmx.de Revision: http://git.php.net/?p=php-src.git;a=commit;h=41fb0eaa116da34fa531437d5b87ca73089e4944 Log: Fix #77700: Writing truecolor images as GIF ignores interlace flag Previous Comments: ------------------------------------------------------------------------ [2019-03-05 23:06:09] cmb@php.net Description: ------------ Since GIF does not support truecolor images, a palette version of the image is created with gdImageCreatePaletteFromTrueColor() internally. When actually converting to GIF, our bundled libgd uses the interlace flag of the palette image, although it is not retained by gdImageCreatePaletteFromTrueColor(). Upstream libgd correctly uses the interlace flag of the original (truecolor) image instead. Test script: --------------- <?php $im = imagecreatetruecolor(10, 10); imagefilledrectangle($im, 0, 0, 9, 9, imagecolorallocate($im, 255, 255, 255)); imageinterlace($im, 1); imagegif($im, __DIR__ . '/test.gif'); $im = imagecreatefromgif(__DIR__ . '/test.gif'); var_dump(imageinterlace($im)); Expected result: ---------------- int(1) Actual result: -------------- int(0) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77700&edit=1