Commit 72be1e2

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Handle alpga for webp is source have alpha (#161)

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Original file line number	Diff line number	Diff line change
`@@ -267,6 +267,10 @@ public function save($filename, $image_type = null, $quality = null, $permission`
`267`	`267`	`$background = imagecolorallocate($dest_image, 255, 255, 255);`
`268`	`268`	`imagefilledrectangle($dest_image, 0, 0, $this->getDestWidth(), $this->getDestHeight(), $background);`
`269`	`269`	`}`
	`270`	`+`
	`271`	`+ imagealphablending($dest_image, false);`
	`272`	`+ imagesavealpha($dest_image, true);`
	`273`	`+`
`270`	`274`	`break;`
`271`	`275`
`272`	`276`	`case IMAGETYPE_PNG:`

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