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name : Decoder.php
 <?php

namespace Intervention\Image\Gd;

use Intervention\Image\Exception\NotReadableException;
use Intervention\Image\Exception\NotSupportedException;
use Intervention\Image\Image;

class Decoder extends \Intervention\Image\AbstractDecoder
{
    /**
     * Initiates new image from path in filesystem
     *
     * @param  string $path
     * @return \Intervention\Image\Image
     */
    public function initFromPath($path)
    {
        if ( ! file_exists($path)) {
            throw new NotReadableException(
                "Unable to find file ({$path})."
            );
        }

        // get mime type of file
        $mime = finfo_file(finfo_open(FILEINFO_MIME_TYPE), $path);

        // define core
        switch (strtolower($mime)) {
            case 'image/png':
            case 'image/x-png':
                $core = @imagecreatefrompng($path);
                break;

            case 'image/jpg':
            case 'image/jpeg':
            case 'image/pjpeg':
                $core = @imagecreatefromjpeg($path);
                if (!$core) {
                    $core= @imagecreatefromstring(file_get_contents($path));
                }
                break;

            case 'image/gif':
                $core = @imagecreatefromgif($path);
                break;

            case 'image/webp':
            case 'image/x-webp':
                if ( ! function_exists('imagecreatefromwebp')) {
                    throw new NotReadableException(
                        "Unsupported image type. GD/PHP installation does not support WebP format."
                    );
                }
                $core = @imagecreatefromwebp($path);
                break;

            case 'image/bmp':
            case 'image/ms-bmp':
            case 'image/x-bitmap':
            case 'image/x-bmp':
            case 'image/x-ms-bmp':
            case 'image/x-win-bitmap':
            case 'image/x-windows-bmp':
            case 'image/x-xbitmap':
                if (! function_exists('imagecreatefrombmp')) {
                    throw new NotReadableException(
                        "Unsupported image type. GD/PHP installation does not support BMP format."
                    );
                }
                $core = @imagecreatefrombmp($path);
                break;

            default:
                throw new NotReadableException(
                    sprintf("Unsupported image type %s. GD driver is only able to decode JPG, PNG, GIF, BMP or WebP files.", strtolower($mime))
                );
        }

        if (empty($core)) {
            throw new NotReadableException(
                "Unable to decode image from file ({$path})."
            );
        }

        $this->gdResourceToTruecolor($core);

        // build image
        $image = $this->initFromGdResource($core);
        $image->mime = $mime;
        $image->setFileInfoFromPath($path);

        return $image;
    }

    /**
     * Initiates new image from GD resource
     *
     * @param  Resource $resource
     * @return \Intervention\Image\Image
     */
    public function initFromGdResource($resource)
    {
        return new Image(new Driver, $resource);
    }

    /**
     * Initiates new image from Imagick object
     *
     * @param  Imagick $object
     * @return \Intervention\Image\Image
     */
    public function initFromImagick(\Imagick $object)
    {
        throw new NotSupportedException(
            "Gd driver is unable to init from Imagick object."
        );
    }

    /**
     * Initiates new image from binary data
     *
     * @param  string $data
     * @return \Intervention\Image\Image
     */
    public function initFromBinary($binary)
    {
        $resource = @imagecreatefromstring($binary);

        if ($resource === false) {
             throw new NotReadableException(
                "Unable to init from given binary data."
            );
        }

        $image = $this->initFromGdResource($resource);
        $image->mime = finfo_buffer(finfo_open(FILEINFO_MIME_TYPE), $binary);

        return $image;
    }

    /**
     * Transform GD resource into Truecolor version
     *
     * @param  resource $resource
     * @return bool
     */
    public function gdResourceToTruecolor(&$resource)
    {
        $width = imagesx($resource);
        $height = imagesy($resource);

        // new canvas
        $canvas = imagecreatetruecolor($width, $height);

        // fill with transparent color
        imagealphablending($canvas, false);
        $transparent = imagecolorallocatealpha($canvas, 255, 255, 255, 127);
        imagefilledrectangle($canvas, 0, 0, $width, $height, $transparent);
        imagecolortransparent($canvas, $transparent);
        imagealphablending($canvas, true);

        // copy original
        imagecopy($canvas, $resource, 0, 0, 0, 0, $width, $height);
        imagedestroy($resource);

        $resource = $canvas;

        return true;
    }
}
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