[Bug 1641307] Re: GD function imagecropauto() missbehaiv in Ubuntu

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: apport (Ubuntu)
       Status: New => Confirmed

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Title:
  GD function imagecropauto() misbehaves in Ubuntu

Status in apport package in Ubuntu:
  Confirmed

Bug description:
  When croptting images with the php function imagecropauto(), the
  returned image is no longer transparant.

  Using the same code in Gentoo gives expected result.

  Example Code:

  <?php
      // Create a 300x300px transparant image with a 100px wide red circle in the middle
      $i = imagecreatetruecolor(300, 300);
      imagealphablending($i, FALSE);
      imagesavealpha($i, TRUE);
      $transparant = imagecolorallocatealpha($i, 0xDD, 0xDD, 0xDD, 0x7F);
      imagecolortransparent($i, $transparant);
      imagefill($i, 0, 0, $transparant);
      $red = imagecolorallocate($i, 0xFF, 0x0, 0x0);
      imagefilledellipse($i, 150, 150, 100, 100, $red);
      imagepng($i, "red_300.png");

      // Crop away transparant parts and save
      $i2 = imagecropauto($i, IMG_CROP_TRANSPARENT);
      imagepng($i2, "red_crop_trans.png");
      imagedestroy($i2);

      // clean up org image
      imagedestroy($i);

  Expected result: 
   * red_300.png: 300x300px, transparant with a 100x100px red circle
   * red_crop_trans.png: 100x100px, transparant with a 100x100px red circle

  Ubuntu Result:
   * red_300.png: 300x300px, transparant with a 101x101px red circle
   * red_crop_trans.png: 101x101px, black with a 101x101px red circle

  Gentoo result: 
   * red_300.png: 300x300px, transparant with a 101x101px red circle
   * red_crop_trans.png: 101x101px, transparant with a 101x101px red circle

  Ubuntu versions:
  lsb_release -d -> 'Ubuntu 16.10'
  php -v -> 'PHP 7.0.8-3ubuntu3'
  apt-cache show php-gd > '1:7.0+44'
  apt-cache show php7.0-gd -> '7.0.8-3ubuntu3'
  apt-cache show libgd3 -> '2.2.1-1ubuntu3.2', '2.2.1-1ubuntu3'
  uname -r -> '4.8.0-26-generic'

  Gentoo versions:
  uname -r -> '4.1.12-gentoo'
  php -v -> 'PHP 5.6.26-pl0-gentoo'
  equery list gd -> 'media-libs/gd-2.1.1-r1'

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