C:/drupal/includes/image.inc

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<?php
// $Id: image.inc,v 1.25 2008/04/14 17:48:33 dries Exp $

function image_get_available_toolkits() {
  $toolkits = file_scan_directory('includes', 'image\..*\.inc$');

  $output = array();
  foreach ($toolkits as $file => $toolkit) {
    include_once "./$file";
    $function = str_replace('.', '_', $toolkit->name) . '_info';
    if (function_exists($function)) {
      $info = $function();
      $output[$info['name']] = $info['title'];
    }
  }

  return $output;
}

function image_get_toolkit() {
  static $toolkit;

  if (!$toolkit) {
    $toolkit = variable_get('image_toolkit', 'gd');
    $toolkit_file = './includes/image.' . $toolkit . '.inc';
    if (isset($toolkit) && file_exists($toolkit_file)) {
      include_once $toolkit_file;
    }
    elseif (!image_gd_check_settings()) {
      $toolkit = FALSE;
    }
  }

  return $toolkit;
}

function image_toolkit_invoke($method, $params = array()) {
  if ($toolkit = image_get_toolkit()) {
    $function = 'image_' . $toolkit . '_' . $method;
    if (function_exists($function)) {
      return call_user_func_array($function, $params);
    }
    else {
      watchdog('php', 'The selected image handling toolkit %toolkit can not correctly process %function.', array('%toolkit' => $toolkit, '%function' => $function), WATCHDOG_ERROR);
      return FALSE;
    }
  }
}


function image_get_info($file) {
  if (!is_file($file)) {
    return FALSE;
  }

  $details = FALSE;
  $data = @getimagesize($file);
  $file_size = @filesize($file);

  if (isset($data) && is_array($data)) {
    $extensions = array('1' => 'gif', '2' => 'jpg', '3' => 'png');
    $extension = array_key_exists($data[2], $extensions) ?  $extensions[$data[2]] : '';
    $details = array('width'     => $data[0],
                     'height'    => $data[1],
                     'extension' => $extension,
                     'file_size' => $file_size,
                     'mime_type' => $data['mime']);
  }

  return $details;
}

function image_scale_and_crop($source, $destination, $width, $height) {
  $info = image_get_info($source);

  $scale = max($width / $info['width'], $height / $info['height']);
  $x = round(($info['width'] * $scale - $width) / 2);
  $y = round(($info['height'] * $scale - $height) / 2);

  if (image_toolkit_invoke('resize', array($source, $destination, $info['width'] * $scale, $info['height'] * $scale))) {
    return image_toolkit_invoke('crop', array($destination, $destination, $x, $y, $width, $height));
  }
  return FALSE;
}

function image_scale($source, $destination, $width, $height) {
  $info = image_get_info($source);

  // Don't scale up.
  if ($width >= $info['width'] && $height >= $info['height']) {
    return FALSE;
  }

  $aspect = $info['height'] / $info['width'];
  if ($aspect < $height / $width) {
    $width = (int)min($width, $info['width']);
    $height = (int)round($width * $aspect);
  }
  else {
    $height = (int)min($height, $info['height']);
    $width = (int)round($height / $aspect);
  }

  return image_toolkit_invoke('resize', array($source, $destination, $width, $height));
}

function image_resize($source, $destination, $width, $height) {
  return image_toolkit_invoke('resize', array($source, $destination, $width, $height));
}

function image_rotate($source, $destination, $degrees, $background = 0x000000) {
  return image_toolkit_invoke('rotate', array($source, $destination, $degrees, $background));
}

function image_crop($source, $destination, $x, $y, $width, $height) {
  return image_toolkit_invoke('crop', array($source, $destination, $x, $y, $width, $height));
}

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