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<?php

namespace Intervention\Image\Gd;

class Encoder extends \Intervention\Image\AbstractEncoder
{
    /**
     * Processes and returns encoded image as JPEG string
     *
     * @return string
     */
    protected function processJpeg()
    {
        ob_start();
        imagejpeg($this->image->getCore(), null, $this->quality);
        $this->image->mime = image_type_to_mime_type(IMAGETYPE_JPEG);
        $buffer = ob_get_contents();
        ob_end_clean();

return $buffer;
    }

/**
     * Processes and returns encoded image as PNG string
     *
     * @return string
     */
    protected function processPng()
    {
        ob_start();
        $resource = $this->image->getCore();
        imagealphablending($resource, false);
        imagesavealpha($resource, true);
        imagepng($resource, null, -1);
        $this->image->mime = image_type_to_mime_type(IMAGETYPE_PNG);
        $buffer = ob_get_contents();
        ob_end_clean();

return $buffer;
    }

/**
     * Processes and returns encoded image as GIF string
     *
     * @return string
     */
    protected function processGif()
    {
        ob_start();
        imagegif($this->image->getCore());
        $this->image->mime = image_type_to_mime_type(IMAGETYPE_GIF);
        $buffer = ob_get_contents();
        ob_end_clean();

return $buffer;
    }

protected function processWebp()
    {
        if ( ! function_exists('imagewebp')) {
            throw new \Intervention\Image\Exception\NotSupportedException(
                "Webp format is not supported by PHP installation."
            );
        }

ob_start();
        imagewebp($this->image->getCore(), null, $this->quality);
        $this->image->mime = defined('IMAGETYPE_WEBP') ? image_type_to_mime_type(IMAGETYPE_WEBP) : 'image/webp';
        $buffer = ob_get_contents();
        ob_end_clean();
        
        return $buffer;
    }

/**
     * Processes and returns encoded image as TIFF string
     *
     * @return string
     */
    protected function processTiff()
    {
        throw new \Intervention\Image\Exception\NotSupportedException(
            "TIFF format is not supported by Gd Driver."
        );
    }

/**
     * Processes and returns encoded image as BMP string
     *
     * @return string
     */
    protected function processBmp()
    {
        throw new \Intervention\Image\Exception\NotSupportedException(
            "BMP format is not supported by Gd Driver."
        );
    }

/**
     * Processes and returns encoded image as ICO string
     *
     * @return string
     */
    protected function processIco()
    {
        throw new \Intervention\Image\Exception\NotSupportedException(
            "ICO format is not supported by Gd Driver."
        );
    }

/**
     * Processes and returns encoded image as PSD string
     *
     * @return string
     */
    protected function processPsd()
    {
        throw new \Intervention\Image\Exception\NotSupportedException(
            "PSD format is not supported by Gd Driver."
        );
    }
}