<?php

class kImageHelper extends kHelper {

	var $Image;
	var $FileName;
	var $ImageInfo;

	function Load($file_name)
	{
		$image_info = getimagesize($file_name);

		list($orig_width, $orig_height, $type, $attr) = $image_info;
		$type = $image_info['mime'];

		$type_to_function = Array(
								'image/jpeg' => 'imagecreatefromjpeg',
								'image/pjpeg' => 'imagecreatefromjpeg',
								'image/png' => 'imagecreatefrompng',
								'image/gif' => 'imagecreatefromgif',
	    					);
		$func_to_use = $type_to_function[$type];

		$this->ImageInfo = $image_info;
		$this->FileName = $file_name;
		return ( $this->Image = @$func_to_use($file_name) ) ? 1 : 0;
	}

	function CopyResizedWithBackground($max_width, $max_height, $quality, $bg_color = false, $target_filename = false)
	{
		list($orig_width, $orig_height, $type, $attr) = $this->ImageInfo;

		$dst_img = imagecreatetruecolor($max_width, $max_height);

		if(!is_array($bg_color))
		{
			$bg_color = Array(0xFF, 0xFF, 0xFF);
		}

		list($r, $g, $b) = $bg_color;
		$bg_color = imagecolorallocate($dst_img, $r, $g, $b);
		imagefill($dst_img, 0 ,0, $bg_color);

		$too_large = ($orig_width > $max_width) || ($orig_height > $max_height);

		if($too_large)
		{
			$width_ratio = $max_width ? $max_width / $orig_width : 1;
			$height_ratio = $max_height ? $max_height / $orig_height : 1;
			$ratio = min($width_ratio, $height_ratio);

			$width = ceil($orig_width * $ratio);
			$height = ceil($orig_height * $ratio);
		}
		else
		{
			$width = $orig_width;
			$height = $orig_height;
		}

		$dst_x = ceil(($max_width - $width) / 2);
		$dst_y = ceil(($max_height - $height) / 2);
		imagecopyresampled($dst_img, $this->Image, $dst_x, $dst_y, 0, 0, $width, $height, $orig_width, $orig_height);

		if($target_filename)
		{
			imagejpeg($dst_img, $target_filename, $quality);
		}
		else
		{
			$this->Image = $dst_img;
		}
	}

	function CopyResized($max_width, $max_height, $quality, $target_filename = false)
	{
		list($orig_width, $orig_height, $type, $attr) = $this->ImageInfo;

		$too_large = ($orig_width > $max_width) || ($orig_height > $max_height);

		if($too_large)
		{
			$width_ratio = $max_width ? $max_width / $orig_width : 1;
			$height_ratio = $max_height ? $max_height / $orig_height : 1;
			$ratio = min($width_ratio, $height_ratio);

			$width = ceil($orig_width * $ratio);
			$height = ceil($orig_height * $ratio);
		}
		else
		{
			$width = $orig_width;
			$height = $orig_height;
		}

		$dst_img = imagecreatetruecolor($width, $height);

		imagecopyresampled($dst_img, $this->Image, 0, 0, 0, 0, $width, $height, $orig_width, $orig_height);

		if($target_filename)
		{
			imagejpeg($dst_img, $target_filename, $quality);
		}
		else
		{
			$this->Image = $dst_img;
		}
	}

	function SaveImage($quality, $file_name = false)
	{
		if(!$file_name)
		{
			$file_name = $this->FileName;
		}
		imagejpeg($this->Image, $file_name, $quality);
	}
}

?>