/**
* Create and load an image from a string. Format is auto-detected.
*
* @param string $string Binary data, i.e. from BLOB field in the database
* @return WideImage_Image WideImage_PaletteImage or WideImage_TrueColorImage instance
*/
static function loadFromString($string)
{
if (strlen($string) < 128) {
throw new WideImage_InvalidImageSourceException("String doesn't contain image data.");
}
$handle = @imagecreatefromstring($string);
if (!self::isValidImageHandle($handle)) {
$custom_mappers = WideImage_MapperFactory::getCustomMappers();
foreach ($custom_mappers as $mime_type => $mapper_class) {
$mapper = WideImage_MapperFactory::selectMapper(null, $mime_type);
$handle = $mapper->loadFromString($string);
if (self::isValidImageHandle($handle)) {
break;
}
}
}
if (!self::isValidImageHandle($handle)) {
throw new WideImage_InvalidImageSourceException("String doesn't contain valid image data.");
}
return self::loadFromHandle($handle);
}
/**
* Returns binary string with image data in format specified by $format
*
* Additional parameters may be passed to the function. See WideImage_Image::saveToFile() for more details.
*
* @param string $format The format of the image
* @return string The binary image data in specified format
*/
function asString($format)
{
ob_start();
$args = func_get_args();
$args[0] = null;
array_unshift($args, $this->getHandle());
$mapper = WideImage_MapperFactory::selectMapper(null, $format);
$res = call_user_func_array(array($mapper, 'save'), $args);
if (!$res) {
throw new WideImage_UnknownErrorWhileMappingException(get_class($mapper) . " returned an invalid result while writing the image data");
}
return ob_get_clean();
}