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<?php
/*
* Copyright 2014-2015 Florian "Bluewind" Pritz <bluewind@server-speed.net>
*
* Licensed under AGPLv3
* (see COPYING for full license text)
*
*/
namespace libraries\Image;
interface ImageDriver {
/**
* Replace the current image by reading in a file
* @param file file to read
*/
public function read($file);
/**
* Return the current image rendered to a specific format. Passing null as
* the target_type returns the image in the format of the source image
* (loaded with read()).
*
* @param target_type one of IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG or null
* @return binary image data
*/
public function get($target_type);
/**
* Resize the image.
* @param width
* @param height
*/
public function resize($width, $height);
/**
* Crop the image to the area defined by x, y, width and height.
*
* @param x starting coordinate
* @param y starting coordinate
* @param width width of the area
* @param height height of the area
*/
public function crop($x, $y, $width, $height);
/**
* Crop/resize the image to fit into the desired size. This also rotates
* the image if the source image had an EXIF orientation tag.
*
* @param width width of the resulting image
* @param height height of the resulting image
*/
public function makeThumb($target_width, $target_height);
/**
* Rotate the image according to the sources EXIF orientation tag if any.
*/
public function apply_exif_orientation();
/**
* Mirror the image along the x axis.
*/
public function mirror();
/**
* Return priority for this driver. Higher number means a higher priority.
*
* @param mimetype mimetype of the file
* @return > 0 if supported, < 0 if the mimetype can't be handled
*/
public static function get_priority($mimetype);
}
namespace libraries;
/**
* This class deals with a single image and provides useful operations that
* operate on this image.
*/
class Image {
private $driver;
private static function get_image_drivers()
{
return array(
"libraries\Image\Drivers\GD",
"libraries\Image\Drivers\imagemagick",
);
}
/**
* Create a new object and load the contents of file.
* @param file file to read
*/
public function __construct($file)
{
$this->read($file);
}
/**
* Get the best driver supporting $mimetype.
*
* @param drivers list of driver classes
* @param mimetype mimetype the driver should support
* @return driver from $drivers or NULL if no driver supports the type
*/
private static function best_driver($drivers, $mimetype)
{
$best = 0;
$best_driver = null;
foreach ($drivers as $driver) {
$current = $driver::get_priority($mimetype);
if ($current > $best && $current > 0) {
$best_driver = $driver;
$best = $current;
}
}
if ($best_driver === NULL) {
throw new \exceptions\PublicApiException("libraries/Image/unsupported-image-type", "Unsupported image type");
}
return $best_driver;
}
/**
* Check if a mimetype is supported by the image library.
*
* @param mimetype
* @return true if supported, false otherwise
*/
public static function type_supported($mimetype)
{
static $cache = array();
if (isset($cache[$mimetype])) {
return $cache[$mimetype];
}
try {
$driver = self::best_driver(self::get_image_drivers(), $mimetype);
$cache[$mimetype] = true;
} catch (\exceptions\ApiException $e) {
if ($e->get_error_id() == "libraries/Image/unsupported-image-type") {
$cache[$mimetype] = false;
} else {
throw $e;
}
}
return $cache[$mimetype];
}
/**
* Replace the current image by reading in a file
* @param file file to read
*/
public function read($file)
{
$mimetype = mimetype($file);
$driver = self::best_driver(self::get_image_drivers(), $mimetype);
$this->driver = new $driver($file);
}
/**
* Return the current image rendered to a specific format. Passing null as
* the target_type returns the image in the format of the source image
* (loaded with read()).
*
* @param target_type one of IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG or null
* @return binary image data
*/
public function get($target_type = null)
{
return $this->driver->get($target_type);
}
/**
* Resize the image.
* @param width
* @param height
*/
public function resize($width, $height)
{
return $this->driver->resize($width, $height);
}
/**
* Crop the image to the area defined by x, y, width and height.
*
* @param x starting coordinate
* @param y starting coordinate
* @param width width of the area
* @param height height of the area
*/
public function crop($x, $y, $width, $height)
{
return $this->driver->crop($x, $y, $width, $height);
}
/**
* Crop/resize the image to fit into the desired size. This also rotates
* the image if the source image had an EXIF orientation tag.
*
* @param width width of the resulting image
* @param height height of the resulting image
*/
public function makeThumb($target_width, $target_height)
{
return $this->driver->makeThumb($target_width, $target_height);
}
static public function get_exif_orientation($file)
{
$exif = \libraries\Exif::get_exif($file);
if (isset($exif["Orientation"])) {
return $exif["Orientation"];
}
return 0;
}
/**
* Rotate the image according to the sources EXIF orientation tag if any.
*/
public function apply_exif_orientation()
{
return $this->driver->apply_exif_orientation();
}
/**
* Mirror the image along the x axis.
*/
public function mirror()
{
return $this->driver->mirror();
}
}
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