/**
* Test to see if we can determine the image format.
*
* @param string $data
*
* @return ImageFormat|null
*/
public function getImageFormat(&$data)
{
if (!$data || strlen($data) < 5) {
return null;
}
// JPEG: FF D8
if (ord($data[0]) == 0xff && ord($data[1]) == 0xd8) {
return ImageFormat::JPEG();
}
// PNG: 89 50 4E 47
if (ord($data[0]) == 0x89 && substr($data, 1, 3) == 'PNG') {
return ImageFormat::PNG();
}
// GIF87a: 47 49 46 38 37 61
// GIF89a: 47 49 46 38 39 61
if (substr($data, 0, 6) == 'GIF87a' || substr($data, 0, 6) == 'GIF89a') {
return ImageFormat::GIF();
}
return null;
}
/**
* @medium
*/
public function testLocalResample()
{
$fn = __DIR__ . '/../Resources/image.png';
$im = new ImageManager(new Filesystem(new LocalAdapter(static::$tmp_dir . 'remote')));
$source = $im->loadFromFile($fn, self::TEST_KEY_VAR);
$resized = $im->createVariation($source, ImageFormat::JPEG(), 90, new ImageDimensions(100));
$this->assertTrue($resized->isHydrated());
$this->assertFalse($resized->isPersistent());
$im->save($resized, self::$tmp_dir . 'local/resized.jpg');
}
