source: extensions/square_thumbnails/trunk/functions.inc.php @ 10386

<?php

if (!defined('PHPWG_ROOT_PATH')) die('Hacking attempt!');

// Resize function for thumbnails creation page
function thumbnail_square_resize($info, $path, $newWidth, $newHeight, $tn_ext)
{
  global $conf, $lang, $page;

  if ($info !== false)
  {
    //someone hooked us - so we skip
    return $info;
  }

  if (!function_exists('gd_info'))
  {
    return;
  }

  $filename = basename($path);
  $dirname = dirname($path);
  
  // extension of the picture filename
  $extension = get_extension($filename);

  if (in_array($extension, array('jpg', 'JPG', 'jpeg', 'JPEG')))
  {
    $srcImage = @imagecreatefromjpeg($path);
  }
  else if ($extension == 'png' or $extension == 'PNG')
  {
    $srcImage = @imagecreatefrompng($path);
  }
  else
  {
    unset($extension);
  }

  if ( isset( $srcImage ) )
  {
    // width/height
    $srcWidth    = imagesx( $srcImage ); 
    $srcHeight   = imagesy( $srcImage ); 

    $coord = process_ratio($srcWidth, $srcHeight);

    $ratioWidth  = $srcWidth/$newWidth;
    $ratioHeight = $srcHeight/$newHeight;

    // maximal size exceeded ?
    if ( ( $ratioWidth > 1 ) or ( $ratioHeight > 1 ) )
    {
      if ( $ratioWidth < $ratioHeight)
      { 
        $destWidth = $srcWidth/$ratioHeight;
        $destHeight = $newHeight; 
      }
      else
      { 
        $destWidth = $newWidth; 
        $destHeight = $srcHeight/$ratioWidth;
      }
    }
    else
    {
      $destWidth = $srcWidth;
      $destHeight = $srcHeight;
    }

    // according to the GD version installed on the server
    if ( $_POST['gd'] == 2 )
    {
      // GD 2.0 or more recent -> good results (but slower)
      $destImage = imagecreatetruecolor( $destWidth, $destHeight); 
      imagecopyresampled( $destImage, $srcImage, 0, 0, $coord['x'], $coord['y'],
                          $destWidth,$destHeight,$srcWidth,$srcHeight );
    }
    else
    {
      // GD prior to version  2 -> pretty bad results :-/ (but fast)
      $destImage = imagecreate( $destWidth, $destHeight);
      imagecopyresized( $destImage, $srcImage, 0, 0, $coord['x'], $coord['y'],
                        $destWidth,$destHeight,$srcWidth,$srcHeight );
    }

    if (($tndir = mkget_thumbnail_dir($dirname, $page['errors'])) == false)
    {
      return false;
    }

    $dest_file = $tndir.'/'.$conf['prefix_thumbnail'];
    $dest_file.= get_filename_wo_extension($filename);
    $dest_file.= '.'.$tn_ext;
    
    // creation and backup of final picture
    if (!is_writable($tndir))
    {
      array_push($page['errors'], '['.$tndir.'] : '.l10n('no write access'));
      return false;
    }
    imagejpeg($destImage, $dest_file, $conf['tn_compression_level']);
    // freeing memory ressources
    imagedestroy( $srcImage );
    imagedestroy( $destImage );
    
    list($tn_width, $tn_height) = getimagesize($dest_file);
    $tn_size = floor(filesize($dest_file) / 1024).' KB';
    
    $info = array( 'path'      => $path,
                   'tn_file'   => $dest_file,
                   'tn_width'  => $tn_width,
                   'tn_height' => $tn_height,
                   'tn_size'   => $tn_size );
    return $info;
  }
  // error
  else
  {
    echo l10n('Picture unreachable or no support')." ";
    if ( isset( $extenstion ) )
    {
      echo l10n('for the file format').' '.$extension;
    }
    else
    {
      echo l10n('for this file format');
    }
    exit();
  }
}


// Resize function for Upload Form
function upload_square_resize($result, $source_filepath, $destination_filepath, $max_width, $max_height, $quality, $strip_metadata=false)
{
  if ($result !== false)
  {
    //someone hooked us - so we skip
    return $result;
  }

  $extension = strtolower(get_extension($source_filepath));

  if (is_imagick() and $extension != 'gif')
  {
    return upload_square_resize_im($source_filepath, $destination_filepath, $max_width, $max_height, $quality, $strip_metadata);
  }
  else
  {
    return upload_square_resize_gd($source_filepath, $destination_filepath, $max_width, $max_height, $quality);
  }
}

function upload_square_resize_gd($source_filepath, $destination_filepath, $max_width, $max_height, $quality)
{
  if (!function_exists('gd_info'))
  {
    return false;
  }

  $gd_info = gd_info();

  // extension of the picture filename
  $extension = strtolower(get_extension($source_filepath));

  $source_image = null;
  if (in_array($extension, array('jpg', 'jpeg')))
  {
    $source_image = @imagecreatefromjpeg($source_filepath);
  }
  else if ($extension == 'png')
  {
    $source_image = @imagecreatefrompng($source_filepath);
  }
  elseif ($extension == 'gif' and $gd_info['GIF Read Support'] and $gd_info['GIF Create Support'])
  {
    $source_image = @imagecreatefromgif($source_filepath);
  }
  else
  {
    die('[GD] unsupported file extension');
  }

  $rotation = null;
  if (function_exists('imagerotate'))
  {
    $rotation = get_rotation_angle($source_filepath);
  }
  
  // width/height
  $source_width  = imagesx($source_image); 
  $source_height = imagesy($source_image);
  
  $coord = process_ratio($source_width, $source_height, $rotation);

  $resize_dimensions = get_resize_dimensions($source_width, $source_height, $max_width, $max_height, $rotation);

  // testing on height is useless in theory: if width is unchanged, there
  // should be no resize, because width/height ratio is not modified.
  if ($resize_dimensions['width'] == $source_width and $resize_dimensions['height'] == $source_height)
  {
    // the image doesn't need any resize! We just copy it to the destination
    copy($source_filepath, $destination_filepath);
    return true;
  }
  
  $destination_image = imagecreatetruecolor($resize_dimensions['width'], $resize_dimensions['height']);
  
  imagecopyresampled(
    $destination_image,
    $source_image,
    0,
    0,
    $coord['x'],
    $coord['y'],
    $resize_dimensions['width'],
    $resize_dimensions['height'],
    $source_width,
    $source_height
    );

  // rotation occurs only on resized photo to avoid useless memory use
  if (isset($rotation))
  {
    $destination_image = imagerotate($destination_image, $rotation, 0);
  }
  
  $extension = strtolower(get_extension($destination_filepath));
  if ($extension == 'png')
  {
    imagepng($destination_image, $destination_filepath);
  }
  elseif ($extension == 'gif')
  {
    imagegif($destination_image, $destination_filepath);
  }
  else
  {
    imagejpeg($destination_image, $destination_filepath, $quality);
  }
  // freeing memory ressources
  imagedestroy($source_image);
  imagedestroy($destination_image);

  // everything should be OK if we are here!
  return true;
}

function upload_square_resize_im($source_filepath, $destination_filepath, $max_width, $max_height, $quality, $strip_metadata=false)
{
  // extension of the picture filename
  $extension = strtolower(get_extension($source_filepath));
  if (!in_array($extension, array('jpg', 'jpeg', 'png')))
  {
    die('[Imagick] unsupported file extension');
  }

  $image = new Imagick($source_filepath);

  // width/height
  $source_width  = $image->getImageWidth();
  $source_height = $image->getImageHeight();

  $coord = process_ratio($source_width, $source_height);

  $image->cropImage($source_width, $source_height, $coord['x'], $coord['y']);
  
  $resize_dimensions = get_resize_dimensions($source_width, $source_height, $max_width, $max_height);

  // testing on height is useless in theory: if width is unchanged, there
  // should be no resize, because width/height ratio is not modified.
  if ($resize_dimensions['width'] == $source_width and $resize_dimensions['height'] == $source_height)
  {
    // the image doesn't need any resize! We just copy it to the destination
    copy($source_filepath, $destination_filepath);
    return true;
  }

  $image->setImageCompressionQuality($quality);
  $image->setInterlaceScheme(Imagick::INTERLACE_LINE);
  
  if ($strip_metadata)
  {
    // we save a few kilobytes. For example a thumbnail with metadata
    // weights 25KB, without metadata 7KB.
    $image->stripImage();
  }
  
  $image->resizeImage($resize_dimensions['width'], $resize_dimensions['height'], Imagick::FILTER_LANCZOS, 0.9);

  $image->writeImage($destination_filepath);
  $image->destroy();

  // everything should be OK if we are here!
  return true;
}

function process_ratio(&$source_width, &$source_height)
{
  global $conf;

  if (!isset($conf['thumbnails_ratio']) or !preg_match('/^\d+:\d+$/', $conf['thumbnails_ratio']))
    $conf['thumbnails_ratio'] = '1:1';

  if (!isset($conf['thumbnails_ratio_orientation']))
    $conf['thumbnails_ratio_orientation'] = true;

  $x = 0;
  $y = 0;

  if ($source_width >= $source_height or !$conf['thumbnails_ratio_orientation'])
    list($widthRatio, $heightRatio) = explode(':', $conf['thumbnails_ratio']);

  else
    list($heightRatio, $widthRatio) = explode(':', $conf['thumbnails_ratio']);

  $img_ratio = $source_width / $source_height;
  $dest_ratio = $widthRatio / $heightRatio;

  if($dest_ratio > $img_ratio)
  {
    $destHeight = round($source_width * $heightRatio / $widthRatio);
    $y = round(($source_height - $destHeight) / 2 );
    $source_height = $destHeight;
  }
  elseif ($dest_ratio < $img_ratio)
  {
    $destWidth = round($source_height * $widthRatio / $heightRatio);
    $x = round(($source_width - $destWidth) / 2 );
    $source_width = $destWidth;
  }

  return array('x' => $x, 'y' => $y);
}

add_event_handler('thumbnail_resize', 'thumbnail_square_resize', 40, 5);
add_event_handler('upload_thumbnail_resize', 'upload_square_resize', 40, 7);

?>