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Merge pull request #23699 from nextcloud/backport/23680/stable20 

[stable20] Enable theming background transparency
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Morris Jobke 2020-10-27 09:06:05 +01:00 committed by GitHub
parent e4534d8389 3e4e05bb93
commit c4d016887b
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1 changed files with 5 additions and 1 deletions
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6
apps/theming/lib/ImageManager.php
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@ -228,13 +228,17 @@ class ImageManager {
// either to big or are not progressive rendering.
$newImage = @imagecreatefromstring(file_get_contents($tmpFile));
// Preserve transparency
imagesavealpha($newImage, true);
imagealphablending($newImage, true);
$tmpFile = $this->tempManager->getTemporaryFile();
$newWidth = (int)(imagesx($newImage) < 4096 ? imagesx($newImage) : 4096);
$newHeight = (int)(imagesy($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));