Thread

if ($width >= $maxWidth || $height >= $maxHeight) {
$this->image_moo
->load($filename)
->resize($maxWidth, $maxHeight)
->save($filename, $overwrite=TRUE);
}

// crop to 16x9
$this->image_moo->load('example.jpg')->ratio(16, 9)->save_dynamic();

public function ratio($width, $height, $rotate = false, $stretch = false)
    //----------------------------------------------------------------------------------------------------------
    // Crop the original image to the aspect ratio $width x $height
    // $rotate - keep the original image orientation even if the aspect ratio does not match
    // $stretch - stretch the image to fit instead of crop
    //----------------------------------------------------------------------------------------------------------
    {
        $ratio = $width / $height;
        $current_ratio = $this->width / $this->height;

        // if rotate is true and the current ratio and requested ratio are different directions
        // switch the width and height
        if ($rotate && (($ratio < 1 && $current_ratio > 1) || ($ratio > 1 && $current_ratio < 1))) {
            $ratio = $height / $width;
        }

        // if the current ratio is the same as the requested ratio do nothing
        if ($current_ratio == $ratio) {
            // return object
            return $this;
        }
        // if the image is wider than the requested ratio
        // use the current height and figure out the width
        if ($current_ratio > $ratio) {
            $w = $this->height * $ratio;
            $h = $this->height;
        // if the image is narrower than the requested ratio
        // use the current width and figure out the height
        } else {
            $w = $this->width;
            $h = $this->width / $ratio;
        }

        // stretch or crop the image
        if ($stretch) {
            $this->stretch($w, $h);
        } else {
            $this->resize_crop($w, $h);
        }

        // return object
        return $this;
    }

$this->image_moo->set_background_colour("TRANSPARENT");

class MY_Image_lib extends CI_Image_lib {
    
    function resizeIntoBox($r=255,$g=255,$b=255, $transparent=true){

        $orginal_aspect = $this->orig_width/$this->orig_height;

        $required_aspect = $this->width/$this->height;

        if($orginal_aspect >= $required_aspect){
            $temp_width = $this->width;
            $temp_height = $this->width / $orginal_aspect;

            // Position the image
            $xPos = 0;
            $yPos = floor(($this->height - $temp_height) / 2);

        } else {
            $temp_width = $this->height * $orginal_aspect;
            $temp_height = $this->height;

            // Position the image
            $xPos = floor(($this->width - $temp_width) / 2);
            $yPos = 0;

        }

        // If resizing the x/y axis must be zero
        $this->x_axis = 0;
        $this->y_axis = 0;

        // Create the image handle
        if ( ! ($src_img = $this->image_create_gd()))
        {
            return FALSE;
        }

        // Create The Image
        if ($this->image_library == 'gd2' AND function_exists('imagecreatetruecolor'))
        {
            $create    = 'imagecreatetruecolor';
            $copy    = 'imagecopyresampled';
        }
        else
        {
            $create    = 'imagecreate';
            $copy    = 'imagecopyresized';
        }


        // Create
        $dst_img = $create($this->width, $this->height);

        // White…
        imagefill ( $dst_img, 0, 0, imagecolorallocate ( imagecreatetruecolor ( 140, 140 ), $r, $g, $b ) );


        if($transparent == true){
            $this->image_type = 3;
            imagecolortransparent ( $dst_img ,  imagecolorallocate ( $dst_img , $r , $g , $b ) );
        }

        // Move into workspace
        $copy($dst_img, $src_img, $xPos, $yPos, $this->x_axis, $this->y_axis, $temp_width, $temp_height, $this->orig_width, $this->orig_height);

        // Show the image
        if ($this->dynamic_output == TRUE)
        {
            $this->image_display_gd($dst_img);
        }
        else
        {
            // Or save it
            if ( ! $this->image_save_gd($dst_img))
            {
                return FALSE;
            }
        }

        // Kill the file handles
        imagedestroy($dst_img);
        imagedestroy($src_img);

        // Set the file to 777
        @chmod($this->full_dst_path, 0777);

        return TRUE;
    }
}

// if padding, fill background
if ($pad)
{
     $col = $this->_html2rgb($this->background_colour);
     $bg = imagecolorallocate($this->temp_image, $col[0], $col[1], $col[2]);
     imagefilledrectangle($this->temp_image, 0, 0, $tx, $ty, $bg);
}

imagealphablending($this->temp_image, false);
imagesavealpha($this->temp_image, true);
$color = imagecolorallocatealpha($this->temp_image, 0, 0, 0, 127);
imagefilledrectangle($this->temp_image, 0, 0, $this->width, $this->height, $color);