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Imagick twitterアイコン用gif加工

Last updated at Posted at 2013-03-14

とりあえず初投稿。
http://hyahha.orz.hm でデモできます。

ImageMagickのインストール方法は省略

ImageMagickのphpモジュールのインストール
 pecl install Imagick
 php -r "phpinfo();" | grep "php.ini"
 echo "extension=imagick.so" >> "php.iniのパス"
twitgif.php
<?php
/**
 * @file
 * GIFアニメーションをTwitter用にリサイズ、圧縮する。
 */

set_time_limit(60);
session_start();
require_once("twitteroauth/twitteroauth.php");
require_once("config.php");
require_once("twitter_user.php");

if ($_SERVER["REQUEST_METHOD"] != "POST" || !isset($_FILES["gif_data"])) {
  header("Status: 400 Bad Request");
  die("400 Bad Request");
}

if (isset($_POST["crop_size"]) && $_POST["crop_size"] == 48) {
  define("GIF_CROP_SIZE", 48);
} else {
  define("GIF_CROP_SIZE", 73);
}

$image = $_FILES["gif_data"];
$screen_name = $user->screen_name;

if ($image["error"] != UPLOAD_ERR_OK) {
  header("Status: 500 Internal Server Error");
  die("upload error");
}
if ($image["type"] != "image/gif") {
  header("Status: 400 Bad Request");
  die("this uploaded file type is not gif");
}

$uniqid = uniqid();

if (strlen($screen_name) < 3) {
  $sub_dir = DOCUMENT_ROOT . "/uploads/other";
} else {
  $sub_dir = DOCUMENT_ROOT . "/uplaods/" . substr($screen_name, 0, 2);
}

if (!is_dir($sub_dir)) {
  mkdir($sub_dir);
}

$user_dir = $sub_dir . "/" . $screen_name;

$file_path = $user_dir . "/" . $uniqid . ".org.gif";
move_uploaded_file($image["tmp_name"], $file_path);

$imagick = new Imagick($file_path);

foreach ($imagick as $im) {
  $im->cropThumbnailImage(GIF_CROP_SIZE, GIF_CROP_SIZE);
}

$gif_path = $user_dir . "/" . $uniqid . ".gif";

$imagick->setCompression(Imagick::COMPRESSION_LZW);
$imagick->quantizeImages(32, Imagick::COLORSPACE_RGB, 0, false, false);
$imagick->writeImages($gif_path, true);
$imagick->destroy();

unlink($file_path);

$gif_url = str_replace(DOCUMENT_ROOT, $host_name, $gif_path);

include("twitgif.inc");
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