<?php
/**
* Class that uses GD library to maintain and make various operations to an image
*
* @author Marcos Luiz Cassarini Taranta <marcos.taranta@gmail.com>
* @since 2009-01-20
* @package view
*/
define("GIF", "image/gif");
define("JPEG", "image/jpeg");
define("PNG", "image/png");
class Image {
private $handler; // GD handler of the image
private $height; // Height of the image
private $mimetype; // Mimetype of the image
public static $allowedMimetypes = array(
"image/gif", "image/jpeg", "image/png",
); // Allowed mimetypes
private $width; // Width of the image
/**
* @return the GD image handler to the image
*/
public function getHandler() {
return $this->handler;
}
/**
* @return the image current height
*/
public function getHeight() {
return $this->height;
}
/**
* @return the image mimetype
*/
public function getMimetype() {
return $this->mimetype;
}
/**
* @return the image current width
*/
public function getWidth() {
return $this->width;
}
/**
* Sets the handler of the image file from the filename or create a new image from the width and height
*
* @param string $filename filename to the existing image file
* @param integer $width width of the new image
* @param integer $height height of the new image
*/
function __construct($filename = "", $width = 0, $height = 0) {
if((empty($filename) || gettype($filename) != "string") && ($width == 0 || gettype($width) != "integer") && ($height == 0 || gettype($height) != "integer")) {
throw new Exception("Wrong parameters");
return;
}
if(!empty($filename)) {
if(file_exists($filename)) {
$fileExtension = explode(".", $filename);
$fileExtension = $fileExtension[count($fileExtension) - 1];
if(!empty($fileExtension)) {
switch($fileExtension) {
case "gif":
$this->handler = imagecreatefromgif($filename);
$this->mimetype = "image/gif";
list($this->width, $this->height) = getimagesize($filename);
break;
case "jpeg":
case "jpg":
$this->handler = imagecreatefromjpeg($filename);
$this->mimetype = "image/jpeg";
list($this->width, $this->height) = getimagesize($filename);
break;
case "png":
$this->handler = imagecreatefrompng($filename);
$this->mimetype = "image/png";
list($this->width, $this->height) = getimagesize($filename);
break;
default:
unset($this->mimetype);
break;
}
}
else {
throw new ErrorException("Mimetype not supported");
}
}
else {
throw new ErrorException("File do not exist");
}
}
else {
$this->handler = imagecreatetruecolor($width, $height);
$this->widht = $width;
$this->height = $height;
}
if(!isset($this->handler))
throw new ErrorException("Image could not be created");
}
/**
* Only makes sure that the image will be destroyed to free the memory
*/
function __destruct() {
if(isset($this->handler))
imagedestroy($this->handler);
}
/**
* Output the object image, if a filename is especified the image will be saved, if dont, the image will be displayed
*
* @param string $type type of the output image, use GIF, JPEG or PNG constants
* @param string $filename filename of the image file to be saved
* @param integer $quality quality of the output image for JPEG need to be between 0~100, for PNG is used for compression, need to be between 0~9
*/
public function output($type = "", $filename = "", $quality = "") {
if(!isset($this->handler)) {
throw new ErrorException("Invalid image handler");
}
if((empty($type) || gettype($type) != "string") && !empty($this->mimetype) && gettype($this->mimetype) == "string")
$type = $this->mimetype;
if(!empty($filename) && gettype($filename) == "string") {
switch($type) {
case GIF:
imagegif($this->handler, $filename);
break;
case JPEG:
if(empty($quality) || gettype($quality) != "integer")
$quality = 75;
if($quality >= 0 && $quality <= 100) {
imagejpeg($this->handler, $filename, $quality);
}
else {
imagejpeg($this->handler, $filename);
}
break;
case PNG:
if(empty($quality) || gettype($quality) != "integer")
$quality = 9;
if($quality >= 0 && $quality <= 9) {
imagepng($this->handler, $filename, $quality);
}
else {
imagepng($this->handler, $filename);
}
break;
default:
throw new ErrorException("Invalid image output type");
break;
}
}
else {
switch($type) {
case GIF:
imagegif($this->handler);
break;
case JPEG:
if($quality >= 0 && $quality <= 100) {
imagejpeg($this->handler, NULL, $quality);
}
else {
imagejpeg($this->handler);
}
break;
case PNG:
if($quality >= 0 && $quality <= 9) {
imagepng($this->handler, NULL, $quality);
}
else {
imagepng($this->handler);
}
break;
default:
throw new ErrorException("Invalid image output type");
break;
}
}
}
/**
* Simply resample the object image to the desired width and height without maintaining any proportion
*
* @param integer $width new width of the image
* @param integer $height new height of the image
*/
public function resample($width, $height) {
if(!isset($this->handler)) {
throw new ErrorException("Invalid image handler");
}
else if($this->width <= 0 || !isset($this->width) || gettype($this->width) != "integer") {
throw new ErrorException("Invalid image width");
}
else if($this->height <= 0 || !isset($this->height) || gettype($this->height) != "integer") {
throw new ErrorException("Invalid image height");
}
else if($width <= 0 || gettype($width) != "integer") {
throw new ErrorException("Invalid new width");
}
else if($height <= 0 || gettype($height) != "integer") {
throw new ErrorException("Invalid new height");
}
$resampledImage = imagecreatetruecolor($width, $height);
imagecopyresampled($resampledImage, $this->handler, 0, 0, 0, 0, $width, $height, $this->width, $this->height);
if(!isset($resampledImage)) {
throw new ErrorException("The image could not be resampled");
}
else {
$this->handler = $resampledImage;
$this->width = $width;
$this->height = $height;
}
}
/**
* Crops and resample the object image so it will have the proportion of the new width and height
*
* @param integer $width new width of the image
* @param integer $height new height of the image
*/
public function resampleCropProportion($width, $height) {
if(!isset($this->handler)) {
throw new ErrorException("Invalid image handler");
}
else if($this->width <= 0 || !isset($this->width) || gettype($this->width) != "integer") {
throw new ErrorException("Invalid image width");
}
else if($this->height <= 0 || !isset($this->height) || gettype($this->height) != "integer") {
throw new ErrorException("Invalid image height");
}
else if($width <= 0 || gettype($width) != "integer") {
throw new ErrorException("Invalid new width");
}
else if($height <= 0 || gettype($height) != "integer") {
throw new ErrorException("Invalid new height");
}
$resampledImage = imagecreatetruecolor($width, $height);
if(($width / $height) < ($this->width / $this->height)) {
$newWidth = floor($this->height * ($width / $height));
$difference = $this->width - $newWidth;
$x = floor($difference / 2);
imagecopyresampled($resampledImage, $this->handler, 0, 0, $x, 0, $width, $height, $newWidth, $this->height);
}
else if(($width / $height) > ($this->width / $this->height)) {
$newHeight = floor($this->width * ($height / $width));
$difference = $this->height - $newHeight;
$y = floor($difference / 2);
imagecopyresampled($resampledImage, $this->handler, 0, 0, 0, $y, $width, $height, $this->width, $newHeight);
}
else {
imagecopyresampled($resampledImage, $this->handler, 0, 0, 0, 0, $width, $height, $this->width, $this->height);
}
if(!isset($resampledImage)) {
throw new ErrorException("The image could not be resampled");
}
else {
$this->handler = $resampledImage;
$this->width = $width;
$this->height = $height;
}
}
/**
* Resample the object image to the new height maintaining the original proportion
*
* @param integer $height new height of the image
*/
public function resampleProportionHeight($height) {
if(!isset($this->handler)) {
throw new ErrorException("Invalid image handler");
}
else if($this->width <= 0 || !isset($this->width) || gettype($this->width) != "integer") {
throw new ErrorException("Invalid image width");
}
else if($this->height <= 0 || !isset($this->height) || gettype($this->height) != "integer") {
throw new ErrorException("Invalid image height");
}
else if($height <= 0 || gettype($height) != "integer") {
throw new ErrorException("Invalid new height");
}
$newWidth = floor($height * ($this->width / $this->height));
$resampledImage = imagecreatetruecolor($newWidth, $height);
imagecopyresampled($resampledImage, $this->handler, 0, 0, 0, 0, $newWidth, $height, $this->width, $this->height);
if(!isset($resampledImage)) {
throw new ErrorException("The image could not be resampled");
}
else {
$this->handler = $resampledImage;
$this->width = $newWidth;
$this->height = $height;
}
}
/**
* Resample the object image to the new width maintaining the original proportion
*
* @param integer $width new width of the image
*/
public function resampleProportionWidth($width) {
if(!isset($this->handler)) {
throw new ErrorException("Invalid image handler");
}
else if($this->width <= 0 || !isset($this->width) || gettype($this->width) != "integer") {
throw new ErrorException("Invalid image width");
}
else if($this->height <= 0 || !isset($this->height) || gettype($this->height) != "integer") {
throw new ErrorException("Invalid image height");
}
else if($width <= 0 || gettype($width) != "integer") {
throw new ErrorException("Invalid new width");
}
$newHeight = floor($width * ($this->height / $this->width));
$resampledImage = imagecreatetruecolor($width, $newHeight);
imagecopyresampled($resampledImage, $this->handler, 0, 0, 0, 0, $width, $newHeight, $this->width, $this->height);
if(!isset($resampledImage)) {
throw new ErrorException("The image could not be resampled");
}
else {
$this->handler = $resampledImage;
$this->width = $width;
$this->height = $newHeight;
}
}
}
?>
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