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