Bug #55332 [NEW]: imagefilledarc renders alpha transparency wrong

From: Operating system: Linux(x86)/GNU/Gentoo(Hardened) PHP version: 5.3.6 Package: GD related Bug Type: Bug Bug description:imagefilledarc renders alpha transparency wrong Description: ------------ When drawing filled arcs with a alpha-transparent color, imagefilledarc creates a transparency gradient that looks like it drew a number of lines on top of each other. The supplied test script and info below is easier to understand, than a textual description can be, GDlib version: 2.0.35 P.S.: The reason I made a new bug for this, is that the old ones are years old, abandonded, lackinng reproducability and are vague in their description. This one is easy to reproduce with the script, very specific and clearly described. The only bugs can be marked as duplicates of this one. Test script: --------------- <?php // Outputs a PNG image with alpha transparency. function imagefilledroundedrectangle(&$im, $x1, $y1, $x2, $y2, $radius, $color) { imagefilledrectangle($im, $x1+$radius, $y1, $x2-$radius, $y1+$radius, $color); imagefilledrectangle($im, $x1, $y1+$radius, $x2, $y2-$radius, $color); imagefilledrectangle($im, $x1+$radius, $y2-$radius, $x2-$radius, $y2, $color); imagefilledarc($im, $x2-$radius, $y2-$radius, $radius*2, $radius*2, 0, 90, $color, IMG_ARC_PIE); imagefilledarc($im, $x1+$radius, $y2-$radius, $radius*2, $radius*2, 90, 180, $color, IMG_ARC_PIE); imagefilledarc($im, $x1+$radius, $y1+$radius, $radius*2, $radius*2, 180, 270, $color, IMG_ARC_PIE); imagefilledarc($im, $x2-$radius, $y1+$radius, $radius*2, $radius*2, 270, 360, $color, IMG_ARC_PIE); } $img = imagecreatetruecolor(200,200); imagefilledroundedrectangle($img, 50, 50, 150, 150, 25, 0x1F7F7F7F); imagepng($img); imagedestroy($img); ?> Expected result: ---------------- A transparent PNG image of 200×200px, containing a rectangle of 100×100px at the center, which has corners rounded to a radius of 25px, a 50% gray color and *uniform* transparency of 25%. Actual result: -------------- A transparent PNG image of 200×200px, containing a rectangle of 100×100px at the center, which has corners rounded to a radius of 25px, a 50% gray color and a transparency *angle gradient* of 0-100%. -- Edit bug report at https://bugs.php.net/bug.php?id=55332&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=55332&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=55332&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=55332&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=55332&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55332&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=55332&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=55332&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=55332&r=needscript Try newer version: https://bugs.php.net/fix.php?id=55332&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=55332&r=support Expected behavior: https://bugs.php.net/fix.php?id=55332&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=55332&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=55332&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=55332&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=55332&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=55332&r=dst IIS Stability: https://bugs.php.net/fix.php?id=55332&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=55332&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=55332&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=55332&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=55332&r=mysqlcfg