webmaster@1: <?php
webmaster@1: // $Id: image.gd.inc,v 1.4 2008/01/15 10:17:42 goba Exp $
webmaster@1: 
webmaster@1: /**
webmaster@1:  * @file
webmaster@1:  * GD2 toolkit for image manipulation within Drupal.
webmaster@1:  */
webmaster@1: 
webmaster@1: /**
webmaster@1:  * @ingroup image
webmaster@1:  * @{
webmaster@1:  */
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Retrieve information about the toolkit.
webmaster@1:  */
webmaster@1: function image_gd_info() {
webmaster@1:   return array('name' => 'gd', 'title' => t('GD2 image manipulation toolkit'));
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Retrieve settings for the GD2 toolkit.
webmaster@1:  */
webmaster@1: function image_gd_settings() {
webmaster@1:   if (image_gd_check_settings()) {
webmaster@1:     $form = array();
webmaster@1:     $form['status'] = array(
webmaster@1:       '#value' => t('The GD toolkit is installed and working properly.')
webmaster@1:     );
webmaster@1: 
webmaster@1:     $form['image_jpeg_quality'] = array(
webmaster@1:       '#type' => 'textfield',
webmaster@1:       '#title' => t('JPEG quality'),
webmaster@1:       '#description' => t('Define the image quality for JPEG manipulations. Ranges from 0 to 100. Higher values mean better image quality but bigger files.'),
webmaster@1:       '#size' => 10,
webmaster@1:       '#maxlength' => 3,
webmaster@1:       '#default_value' => variable_get('image_jpeg_quality', 75),
webmaster@1:       '#field_suffix' => t('%'),
webmaster@1:     );
webmaster@1:     $form['#element_validate'] = array('image_gd_settings_validate');
webmaster@1:     
webmaster@1:     return $form;
webmaster@1:   }
webmaster@1:   else {
webmaster@1:     form_set_error('image_toolkit', t('The GD image toolkit requires that the GD module for PHP be installed and configured properly. For more information see <a href="@url">PHP\'s image documentation</a>.', array('@url' => 'http://php.net/image')));
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Validate the submitted GD settings.
webmaster@1:  */
webmaster@1: function image_gd_settings_validate($form, &$form_state) {
webmaster@1:   // Validate image quality range.
webmaster@1:   $value = $form_state['values']['image_jpeg_quality'];
webmaster@1:   if (!is_numeric($value) || $value < 0 || $value > 100) {
webmaster@1:     form_set_error('image_jpeg_quality', t('JPEG quality must be a number between 0 and 100.'));
webmaster@1:   }
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Verify GD2 settings (that the right version is actually installed).
webmaster@1:  *
webmaster@1:  * @return
webmaster@1:  *   A boolean indicating if the GD toolkit is avaiable on this machine.
webmaster@1:  */
webmaster@1: function image_gd_check_settings() {
webmaster@1:   if ($check = get_extension_funcs('gd')) {
webmaster@1:     if (in_array('imagegd2', $check)) {
webmaster@1:       // GD2 support is available.
webmaster@1:       return TRUE;
webmaster@1:     }
webmaster@1:   }
webmaster@1:   return FALSE;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Scale an image to the specified size using GD.
webmaster@1:  */
webmaster@1: function image_gd_resize($source, $destination, $width, $height) {
webmaster@1:   if (!file_exists($source)) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $info = image_get_info($source);
webmaster@1:   if (!$info) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $im = image_gd_open($source, $info['extension']);
webmaster@1:   if (!$im) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $res = imagecreatetruecolor($width, $height);
webmaster@1:   if ($info['extension'] == 'png') {
webmaster@1:     $transparency = imagecolorallocatealpha($res, 0, 0, 0, 127);
webmaster@1:     imagealphablending($res, FALSE);
webmaster@1:     imagefilledrectangle($res, 0, 0, $width, $height, $transparency);
webmaster@1:     imagealphablending($res, TRUE);
webmaster@1:     imagesavealpha($res, TRUE);
webmaster@1:   }
webmaster@1:   elseif ($info['extension'] == 'gif') {
webmaster@1:     // If we have a specific transparent color.
webmaster@1:     $transparency_index = imagecolortransparent($im);
webmaster@1:     if ($transparency_index >= 0) {
webmaster@1:       // Get the original image's transparent color's RGB values.
webmaster@1:       $transparent_color = imagecolorsforindex($im, $transparency_index);
webmaster@1:       // Allocate the same color in the new image resource.
webmaster@1:       $transparency_index = imagecolorallocate($res, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
webmaster@1:       // Completely fill the background of the new image with allocated color.
webmaster@1:       imagefill($res, 0, 0, $transparency_index);
webmaster@1:       // Set the background color for new image to transparent.
webmaster@1:       imagecolortransparent($res, $transparency_index);
webmaster@1:       // Find number of colors in the images palette.
webmaster@1:       $number_colors = imagecolorstotal($im);
webmaster@1:       // Convert from true color to palette to fix transparency issues.
webmaster@1:       imagetruecolortopalette($res, TRUE, $number_colors);
webmaster@1:     }
webmaster@1:   }
webmaster@1:   imagecopyresampled($res, $im, 0, 0, 0, 0, $width, $height, $info['width'], $info['height']);
webmaster@1:   $result = image_gd_close($res, $destination, $info['extension']);
webmaster@1: 
webmaster@1:   imagedestroy($res);
webmaster@1:   imagedestroy($im);
webmaster@1: 
webmaster@1:   return $result;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Rotate an image the given number of degrees.
webmaster@1:  */
webmaster@1: function image_gd_rotate($source, $destination, $degrees, $background = 0x000000) {
webmaster@1:   if (!function_exists('imageRotate')) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $info = image_get_info($source);
webmaster@1:   if (!$info) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $im = image_gd_open($source, $info['extension']);
webmaster@1:   if (!$im) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $res = imageRotate($im, $degrees, $background);
webmaster@1:   $result = image_gd_close($res, $destination, $info['extension']);
webmaster@1: 
webmaster@1:   return $result;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Crop an image using the GD toolkit.
webmaster@1:  */
webmaster@1: function image_gd_crop($source, $destination, $x, $y, $width, $height) {
webmaster@1:   $info = image_get_info($source);
webmaster@1:   if (!$info) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $im = image_gd_open($source, $info['extension']);
webmaster@1:   $res = imageCreateTrueColor($width, $height);
webmaster@1:   imageCopy($res, $im, 0, 0, $x, $y, $width, $height);
webmaster@1:   $result = image_gd_close($res, $destination, $info['extension']);
webmaster@1: 
webmaster@1:   imageDestroy($res);
webmaster@1:   imageDestroy($im);
webmaster@1: 
webmaster@1:   return $result;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * GD helper function to create an image resource from a file.
webmaster@1:  *
webmaster@1:  * @param $file
webmaster@1:  *   A string file path where the iamge should be saved.
webmaster@1:  * @param $extension
webmaster@1:  *   A string containing one of the following extensions: gif, jpg, jpeg, png.
webmaster@1:  * @return
webmaster@1:  *   An image resource, or FALSE on error.
webmaster@1:  */
webmaster@1: function image_gd_open($file, $extension) {
webmaster@1:   $extension = str_replace('jpg', 'jpeg', $extension);
webmaster@1:   $open_func = 'imageCreateFrom'. $extension;
webmaster@1:   if (!function_exists($open_func)) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1:   return $open_func($file);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * GD helper to write an image resource to a destination file.
webmaster@1:  *
webmaster@1:  * @param $res
webmaster@1:  *   An image resource created with image_gd_open().
webmaster@1:  * @param $destination
webmaster@1:  *   A string file path where the iamge should be saved.
webmaster@1:  * @param $extension
webmaster@1:  *   A string containing one of the following extensions: gif, jpg, jpeg, png.
webmaster@1:  * @return
webmaster@1:  *   Boolean indicating success.
webmaster@1:  */
webmaster@1: function image_gd_close($res, $destination, $extension) {
webmaster@1:   $extension = str_replace('jpg', 'jpeg', $extension);
webmaster@1:   $close_func = 'image'. $extension;
webmaster@1:   if (!function_exists($close_func)) {
webmaster@1:     return FALSE;
webmaster@1:   }
webmaster@1:   if ($extension == 'jpeg') {
webmaster@1:     return $close_func($res, $destination, variable_get('image_jpeg_quality', 75));
webmaster@1:   }
webmaster@1:   else {
webmaster@1:     return $close_func($res, $destination);
webmaster@1:   }
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * @} End of "ingroup image".
webmaster@1:  */