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Merge pull request #23705 from nextcloud/backport/23680/stable19 

[stable19] Enable theming background transparency
This commit is contained in:
Roeland Jago Douma 2020-10-27 19:59:58 +01:00 committed by GitHub
parent 93bc5ea744 09d4aa3010
commit e9cfc6fd10
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1 changed files with 5 additions and 1 deletions
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6
apps/theming/lib/Controller/ThemingController.php
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@ -285,13 +285,17 @@ class ThemingController extends Controller {
// either to big or are not progressive rendering.
$newImage = @imagecreatefromstring(file_get_contents($image['tmp_name'], 'r'));
// Preserve transparency
imagesavealpha($newImage, true);
imagealphablending($newImage, true);
$tmpFile = $this->tempManager->getTemporaryFile();
$newWidth = imagesx($newImage) < 4096 ? imagesx($newImage) : 4096;
$newHeight = imagesy($newImage) / (imagesx($newImage) / $newWidth);
$outputImage = imagescale($newImage, $newWidth, $newHeight);
imageinterlace($outputImage, 1);
imagejpeg($outputImage, $tmpFile, 75);
imagepng($outputImage, $tmpFile, 8);
imagedestroy($outputImage);
$target->putContent(file_get_contents($tmpFile, 'r'));