/home/edulekha/studygroup.edulekha.com/ow_libraries/wideimage/WideImage.php
<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package WideImage
**/
require_once WideImage::path() . 'Exception.php';
require_once WideImage::path() . 'Image.php';
require_once WideImage::path() . 'TrueColorImage.php';
require_once WideImage::path() . 'PaletteImage.php';
require_once WideImage::path() . 'Coordinate.php';
require_once WideImage::path() . 'Canvas.php';
require_once WideImage::path() . 'MapperFactory.php';
require_once WideImage::path() . 'OperationFactory.php';
require_once WideImage::path() . 'Font/TTF.php';
require_once WideImage::path() . 'Font/GDF.php';
require_once WideImage::path() . 'Font/PS.php';
/**
* @package Exceptions
*/
class WideImage_InvalidImageHandleException extends WideImage_Exception {}
/**
* @package Exceptions
*/
class WideImage_InvalidImageSourceException extends WideImage_Exception {}
/**
* @package Exceptions
*
* Class for invalid GD function calls result (for example those that return bool)
*/
class WideImage_GDFunctionResultException extends WideImage_Exception {}
/**
* The gateway class for loading images and core library functions
*
* @package WideImage
*/
class WideImage
{
const SIDE_TOP_LEFT = 1;
const SIDE_TOP = 2;
const SIDE_TOP_RIGHT = 4;
const SIDE_RIGHT = 8;
const SIDE_BOTTOM_RIGHT = 16;
const SIDE_BOTTOM = 32;
const SIDE_BOTTOM_LEFT = 64;
const SIDE_LEFT = 128;
const SIDE_ALL = 255;
/**
* @var string Path to the library base directory
*/
protected static $path = null;
/**
* Returns the library version
* @return string The library version
*/
static function version()
{
return '11.02.19';
}
/**
* Returns the path to the library
* @return string
*/
static function path()
{
if (self::$path === null)
self::$path = dirname(__FILE__) . DIRECTORY_SEPARATOR;
return self::$path;
}
/**
* Checks whether the gd library is loaded, and throws an exception otherwise
*/
static function checkGD()
{
if (!extension_loaded('gd'))
throw new WideImage_Exception("WideImage requires the GD extension, but it's apparently not loaded.");
}
/**
* Registers a custom mapper for image loading and saving
*
* Example:
* <code>
* WideImage::registerCustomMapper('WideImage_Mapper_TGA', 'image/tga', 'tga');
* </code>
*
* @param string $mapper_class_name
* @param string $mime_type
* @param string $extension
*/
static function registerCustomMapper($mapper_class_name, $mime_type, $extension)
{
WideImage_MapperFactory::registerMapper($mapper_class_name, $mime_type, strtoupper($extension));
}
/**
* Loads an image from a file, URL, HTML input file field, binary string, or a valid image handle.
* The image format is auto-detected.
*
* Currently supported formats: PNG, GIF, JPG, BMP, TGA, GD, GD2.
*
* This function analyzes the input and decides whether to use WideImage::loadFromHandle(),
* WideImage::loadFromFile(), WideImage::loadFromUpload() or WideImage::loadFromString(),
* all of which you can also call directly to spare WideImage some guessing.
*
* Arrays are supported for upload fields; it returns an array of loaded images.
* To load only a single image from an array field, use WideImage::loadFromUpload('img', $i),
* where $i is the index of the image you want to load.
*
* <code>
* $img = WideImage::load('http://url/image.png'); // image URL
* $img = WideImage::load('/path/to/image.png'); // local file path
* $img = WideImage::load('img'); // upload field name
* $img = WideImage::load(imagecreatetruecolor(10, 10)); // a GD resource
* $img = WideImage::load($image_data); // binary string containing image data
* </code>
*
* @param mixed $source File name, url, HTML file input field name, binary string, or a GD image resource
* @return WideImage_Image WideImage_PaletteImage or WideImage_TrueColorImage instance
*/
static function load($source)
{
$predictedSourceType = '';
if ($source == '')
$predictedSourceType = 'String';
// Creating image via a valid resource
if (!$predictedSourceType && self::isValidImageHandle($source))
$predictedSourceType = 'Handle';
// Check for binary string
if (!$predictedSourceType)
{
// search first $binLength bytes (at a maximum) for ord<32 characters (binary image data)
$binLength = 64;
$sourceLength = strlen($source);
$maxlen = ($sourceLength > $binLength) ? $binLength : $sourceLength;
for ($i = 0; $i < $maxlen; $i++)
if (ord($source[$i]) < 32)
{
$predictedSourceType = 'String';
break;
}
}
// Uploaded image (array uploads not supported)
if (isset($_FILES[$source]) && isset($_FILES[$source]['tmp_name']))
$predictedSourceType = 'Upload';
// Otherwise, must be a file or an URL
if (!$predictedSourceType)
$predictedSourceType = 'File';
return call_user_func(array('WideImage', 'loadFrom' . $predictedSourceType), $source);
}
/**
* Create and load an image from a file or URL. The image format is auto-detected.
*
* @param string $uri File or url
* @return WideImage_Image WideImage_PaletteImage or WideImage_TrueColorImage instance
*/
static function loadFromFile($uri)
{
$data = file_get_contents($uri);
$handle = @imagecreatefromstring($data);
if (!self::isValidImageHandle($handle))
{
try
{
// try to find a mapper first
$mapper = WideImage_MapperFactory::selectMapper($uri);
if ($mapper)
$handle = $mapper->load($uri);
}
catch (WideImage_UnsupportedFormatException $e)
{
// mapper not found
}
// try all custom mappers
if (!self::isValidImageHandle($handle))
{
$custom_mappers = WideImage_MapperFactory::getCustomMappers();
foreach ($custom_mappers as $mime_type => $mapper_class)
{
$mapper = WideImage_MapperFactory::selectMapper(null, $mime_type);
$handle = $mapper->loadFromString($data);
if (self::isValidImageHandle($handle))
break;
}
}
}
if (!self::isValidImageHandle($handle))
throw new WideImage_InvalidImageSourceException("File '{$uri}' appears to be an invalid image source.");
return self::loadFromHandle($handle);
}
/**
* 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);
}
/**
* Create and load an image from an image handle.
*
* <b>Note:</b> the resulting image object takes ownership of the passed
* handle. When the newly-created image object is destroyed, the handle is
* destroyed too, so it's not a valid image handle anymore. In order to
* preserve the handle for use after object destruction, you have to call
* WideImage_Image::releaseHandle() on the created image instance prior to its
* destruction.
*
* <code>
* $handle = imagecreatefrompng('file.png');
* $image = WideImage::loadFromHandle($handle);
* </code>
*
* @param resource $handle A valid GD image resource
* @return WideImage_Image WideImage_PaletteImage or WideImage_TrueColorImage instance
*/
static function loadFromHandle($handle)
{
if (!self::isValidImageHandle($handle))
throw new WideImage_InvalidImageSourceException("Handle is not a valid GD image resource.");
if (imageistruecolor($handle))
return new WideImage_TrueColorImage($handle);
else
return new WideImage_PaletteImage($handle);
}
/**
* This method loads a file from the $_FILES array. The image format is auto-detected.
*
* You only have to pass the field name as the parameter. For array fields, this function will
* return an array of image objects, unless you specify the $index parameter, which will
* load the desired image.
*
* @param $field_name Name of the key in $_FILES array
* @param int $index The index of the file to load (if the input field is an array)
* @return WideImage_Image The loaded image
*/
static function loadFromUpload($field_name, $index = null)
{
if (!array_key_exists($field_name, $_FILES))
throw new WideImage_InvalidImageSourceException("Upload field '{$field_name}' doesn't exist.");
if (is_array($_FILES[$field_name]['tmp_name']))
{
if (isset($_FILES[$field_name]['tmp_name'][$index]))
$filename = $_FILES[$field_name]['tmp_name'][$index];
else
{
$result = array();
foreach ($_FILES[$field_name]['tmp_name'] as $idx => $tmp_name)
$result[$idx] = self::loadFromFile($tmp_name);
return $result;
}
}
else
$filename = $_FILES[$field_name]['tmp_name'];
if (!file_exists($filename))
throw new WideImage_InvalidImageSourceException("Uploaded file doesn't exist.");
return self::loadFromFile($filename);
}
/**
* Factory method for creating a palette image
*
* @param int $width
* @param int $height
* @return WideImage_PaletteImage
*/
static function createPaletteImage($width, $height)
{
return WideImage_PaletteImage::create($width, $height);
}
/**
* Factory method for creating a true-color image
*
* @param int $width
* @param int $height
* @return WideImage_TrueColorImage
*/
static function createTrueColorImage($width, $height)
{
return WideImage_TrueColorImage::create($width, $height);
}
/**
* Check whether the given handle is a valid GD resource
*
* @param mixed $handle The variable to check
* @return bool
*/
static function isValidImageHandle($handle)
{
return (is_resource($handle) && get_resource_type($handle) == 'gd');
}
/**
* Throws exception if the handle isn't a valid GD resource
*
* @param mixed $handle The variable to check
*/
static function assertValidImageHandle($handle)
{
if (!self::isValidImageHandle($handle))
throw new WideImage_InvalidImageHandleException("{$handle} is not a valid image handle.");
}
}
WideImage::checkGD();
WideImage::registerCustomMapper('WideImage_Mapper_BMP', 'image/bmp', 'bmp');
WideImage::registerCustomMapper('WideImage_Mapper_TGA', 'image/tga', 'tga');