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Only resize an image if it results in a smaller image size #32787

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Only resize an image if it results in a smaller image size #32787

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48eb65e
Only resize an image if it results in a smaller image size
jcjveraa Jun 9, 2022
c9f94dd
Fix docstring
jcjveraa Jun 9, 2022
8b7afdb
Retain file type but ensure 'progressive' image
jcjveraa Jun 9, 2022
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46 changes: 32 additions & 14 deletions apps/theming/lib/ImageManager.php
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Original file line number Diff line number Diff line change
Expand Up @@ -232,29 +232,47 @@ public function updateImage(string $key, string $tmpFile): string {
}

if ($key === 'background' && strpos($detectedMimeType, 'image/svg') === false && strpos($detectedMimeType, 'image/gif') === false) {
$tmpFile = $this->getResizedImagePathIfResizeIsSmaller($tmpFile);
}

$target->putContent(file_get_contents($tmpFile));
return $detectedMimeType;
}

/**
* Returns the file path of the file stored as a png and resized to be
* a maximum of 4096 pixels wide (preserving aspect ratio), but only if the resizing
* results in an image that has a smaller file size than the uploaded file.
*
* @param string $originalTmpFile The tmpFile(path) as uploaded by the user
* @return string Location of the resized file, or the original
*/
private function getResizedImagePathIfResizeIsSmaller(string $originalTmpFile): string
{
// Optimize the image since some people may upload images that will be
// either to big or are not progressive rendering.
$newImage = @imagecreatefromstring(file_get_contents($tmpFile));
$newImage = @imagecreatefromstring(file_get_contents($originalTmpFile));

// Preserve transparency
imagesavealpha($newImage, true);
imagealphablending($newImage, true);
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);
$newImageTmpFile = $this->tempManager->getTemporaryFile();
$newWidth = (int)(imagesx($newImage) < 4096 ? imagesx($newImage) : 4096);
$newHeight = (int)(imagesy($newImage) / (imagesx($newImage) / $newWidth));
$outputImage = imagescale($newImage, $newWidth, $newHeight);

imageinterlace($outputImage, 1);
imagepng($outputImage, $tmpFile, 8);
imagedestroy($outputImage);
imageinterlace($outputImage, 1);
imagepng($outputImage, $newImageTmpFile, 8);
imagedestroy($outputImage);

$target->putContent(file_get_contents($tmpFile));
// only actually use the image if it is an improvement
$newImageIsSmaller = filesize($newImageTmpFile) <= filesize($originalTmpFile);
if ($newImageIsSmaller) {
return $newImageTmpFile;
} else {
$target->putContent(file_get_contents($tmpFile));
return $originalTmpFile;
}

return $detectedMimeType;
}

/**
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