src/Intervention/Gif/Decoded.php
public function addSize($width, $height)
    {
        $size = new \StdClass;
        $size->width = $width;
        $size->height = $height;

        $this->addToFirstFrameWithoutProperty($size, 'size');
    }
public function addSize($width, $height)
    {
        $size = new \StdClass;
        $size->width = $width;
        $size->height = $height;

        $this->addToFirstFrameWithoutProperty($size, 'size');
    }
Adds size to first frame without size

@param integer $width
@param integer $height