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| <?php
function convertToWebp($source, $destination, $quality = 60) {
$info = getimagesize($source);
if ($info['mime'] == 'image/jpeg') {
$image = imagecreatefromjpeg($source);
} elseif ($info['mime'] == 'image/gif') {
return false;
} else {
return false;
}
$width = imagesx($image);
$height = imagesy($image);
$maxWidth = 2500;
$maxHeight = 1600;
if ($width > $maxWidth || $height > $maxHeight) {
$ratio = min($maxWidth / $width, $maxHeight / $height);
$newWidth = round($width * $ratio);
$newHeight = round($height * $ratio);
$newImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagedestroy($image);
$image = $newImage;
}
$result = imagewebp($image, $destination, $quality);
imagedestroy($image);
gc_collect_cycles();
return $result;
}
function convertPngWithImagick($source, $destination, $quality = 60) {
try {
$image = new Imagick($source);
if ($image->getImageAlphaChannel()) {
$image->setImageBackgroundColor(new ImagickPixel('transparent'));
$image->setImageAlphaChannel(Imagick::ALPHACHANNEL_ACTIVATE);
$image = $image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
}
$image->setImageFormat('webp');
$image->setImageCompressionQuality($quality);
$width = $image->getImageWidth();
$height = $image->getImageHeight();
$maxWidth = 2500;
$maxHeight = 1600;
if ($width > $maxWidth || $height > $maxHeight) {
$ratio = min($maxWidth / $width, $maxHeight / $height);
$newWidth = round($width * $ratio);
$newHeight = round($height * $ratio);
$image->resizeImage($newWidth, $newHeight, Imagick::FILTER_LANCZOS, 1);
}
$result = $image->writeImage($destination);
$image->clear();
$image->destroy();
return $result;
} catch (Exception $e) {
logMessage('Imagick转换PNG失败: ' . $e->getMessage());
return false;
}
}
function convertGifToWebp($source, $destination, $quality = 60) {
try {
$image = new Imagick();
$image->readImage($source);
$image = $image->coalesceImages();
foreach ($image as $frame) {
$frame->setImageFormat('webp');
$frame->setImageCompressionQuality($quality);
}
$image = $image->optimizeImageLayers();
$result = $image->writeImages($destination, true);
$image->clear();
$image->destroy();
return $result;
} catch (Exception $e) {
logMessage('GIF转换WebP失败: ' . $e->getMessage());
return false;
}
}
function processImageCompression($fileMimeType, $newFilePath, $newFilePathWithoutExt, $quality) {
$convertSuccess = true;
$finalFilePath = $newFilePath;
if ($fileMimeType === 'image/png') {
$convertSuccess = convertPngWithImagick($newFilePath, $newFilePathWithoutExt . '.webp', $quality);
if ($convertSuccess) {
$finalFilePath = $newFilePathWithoutExt . '.webp';
unlink($newFilePath);
}
} elseif ($fileMimeType === 'image/gif') {
$convertSuccess = convertGifToWebp($newFilePath, $newFilePathWithoutExt . '.webp', $quality);
if ($convertSuccess) {
$finalFilePath = $newFilePathWithoutExt . '.webp';
unlink($newFilePath);
}
} elseif ($fileMimeType !== 'image/webp' && $fileMimeType !== 'image/svg+xml') {
$convertSuccess = convertToWebp($newFilePath, $newFilePathWithoutExt . '.webp', $quality);
if ($convertSuccess) {
$finalFilePath = $newFilePathWithoutExt . '.webp';
unlink($newFilePath);
}
}
return [$convertSuccess, $finalFilePath];
}
?>
|
