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<?php
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// $Id: image.inc,v 1.1 2005/02/01 16:27:43 dries Exp $
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/**
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* Return a list of available toolkits.
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*
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* @return An array of toolkit name => descriptive title
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*/
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function image_get_available_toolkits() {
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$toolkits = file_scan_directory('includes', 'image\..*\.inc$');
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$output = array();
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foreach ($toolkits as $file => $toolkit) {
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include_once($file);
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$function = str_replace('.', '_', $toolkit->name) . '_info';
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if (function_exists($function)) {
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$info = $function();
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$output[$info['name']] = $info['title'];
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}
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}
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$output['gd'] = t('Built-in GD Toolkit');
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return $output;
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}
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/**
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* Retrieve the name of the currently used toolkit.
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*
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* @return String containing the name of the toolkit.
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*/
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function image_get_toolkit() {
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static $toolkit;
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if (!$toolkit) {
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$toolkit = variable_get('image_toolkit', 'gd');
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if ($toolkit != 'gd') {
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include_once 'includes/image.'.$toolkit.'.inc';
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}
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}
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return $toolkit;
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}
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/**
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* Invokes the given method using the currently selected toolkit.
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*
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* @param $method A string containing the method to invoke.
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* @param $params An optional array of parameters to pass to the toolkit method
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*
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* @return Mixed values (typically Boolean for successful operation)
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*/
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function image_toolkit_invoke($method, $params = array()) {
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$toolkit = image_get_toolkit();
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$function = 'image_' . $toolkit . '_'. $method;
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if (function_exists($function)) {
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return call_user_func_array($function, $params);
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}
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else {
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drupal_set_message(t('%method is not supported by %toolkit.', array('%method' => "<em>$method</em>", '%toolkit' => "<em>$toolkit</em>")));
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}
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}
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/**
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* Get details about an image.
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*
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* @return array containing information about the image
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* 'width': image's width in pixels
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* 'height': image's height in pixels
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* 'extension': commonly used extension for the image
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* 'mime_type': image's MIME type ('image/jpeg', 'image/gif', etc.)
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*/
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function image_get_info($file) {
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if (!file_exists($file)) {
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return false;
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}
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$details = false;
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$data = @getimagesize($file);
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if (is_array($data)) {
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$extensions = array('1' => 'gif', '2' => 'jpg', '3' => 'png');
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$extension = array_key_exists($data[2], $extensions) ? $extensions[$data[2]] : '';
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$details = array('width' => $data[0],
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'height' => $data[1],
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'extension' => $extension,
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'mime_type' => $data['mime']);
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}
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return $details;
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}
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/**
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* Scales an image to the given width and height while maintaining aspect
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* ratio.
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*
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* @param $source The filepath of the source image
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* @param $destination The file path of the destination image
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* @param $width The target width
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* @param $height The target height
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*
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* @return True or false, based on success
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*/
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function image_scale($source, $destination, $width, $height) {
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$info = image_get_info($source);
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// don't scale up
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if ($width > $info['width'] && $height > $info['height']) {
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return false;
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}
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$aspect = $info['height'] / $info['width'];
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if ($aspect < $height / $width) {
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$width = (int)min($width, $info['width']);
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$height = (int)round($width * $aspect);
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} else {
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$height = (int)min($height, $info['height']);
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$width = (int)round($height / $aspect);
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}
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return image_toolkit_invoke('resize', array($source, $destination, $width, $height));
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}
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/**
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* Resize an image to the given dimensions (ignoring aspect ratio).
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*
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* @param $source The filepath of the source image.
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* @param $destination The file path of the destination image.
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* @param $width The target width.
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* @param $height The target height.
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*/
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function image_resize($source, $destination, $width, $height) {
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return image_toolkit_invoke('resize', array($source, $destination, $width, $height));
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}
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/**
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* Rotate an image by the given number of degrees.
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*
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* @param $source The filepath of the source image
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* @param $destination The file path of the destination image
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* @param $degrees The number of (clockwise) degrees to rotate the image
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*/
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function image_rotate($source, $destination, $degrees) {
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return image_toolkit_invoke('rotate', array($source, $destination, $degrees));
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}
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/**
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* Crop an image to the rectangle specified by the given rectangle.
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*
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* @param $source The filepath of the source image
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* @param $destination The file path of the destination image
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* @param $x The top left co-ordinate of the crop area (x axis value)
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* @param $y The top left co-ordinate of the crop area (y axis value)
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* @param $width The target width
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* @param $height The target height
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*/
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function image_crop($source, $destination, $x, $y, $width, $height) {
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return image_toolkit_invoke('crop', array($source, $destination, $x, $y, $width, $height));
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}
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/**
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* GD Toolkit functions
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*/
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/**
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* Verify GD settings (that the extension is actually installed).
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*/
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function image_gd_settings() {
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if (!extension_loaded('gd')) {
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drupal_set_message(t('Unable to load the GD toolkit'), 'error');
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}
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}
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/**
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* Scale an image to the specified size using GD.
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*/
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function image_gd_resize($source, $destination, $width, $height) {
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if (!file_exists($source)) {
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return false;
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}
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$info = image_get_info($source);
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if (!$info) {
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return false;
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}
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$im = image_gd_open($source, $info['extension']);
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if (!$im) {
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return false;
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}
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// GD1 doesn't have true color
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if (function_exists('imageCreateTrueColor')) {
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$res = imageCreateTrueColor($width, $height);
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}
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else {
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$res = imageCreate($width, $height);
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}
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// GD1 doesn't have copyResampled
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if (function_exists('imageCopyResampled')) {
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imageCopyResampled($res, $im, 0, 0, 0, 0, $width, $height, $info['width'], $info['height']);
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}
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else {
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imageCopyResized($res, $im, 0, 0, 0, 0, $width, $height, $info['width'], $info['height']);
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}
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$result = image_gd_close($res, $destination, $info['extension']);
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imageDestroy($res);
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imageDestroy($im);
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return $result;
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}
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/**
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* Rotate an image the given number of degrees.
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*/
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function image_gd_rotate($source, $destination, $degrees, $bg_color = 0) {
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if (!function_exists('imageRotate')) {
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return false;
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}
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$info = image_get_info($source);
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if (!$info) {
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return false;
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}
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$im = image_gd_open($source, $info['extension']);
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if (!$im) {
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return false;
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}
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$res = imageRotate($im, $degrees, $bg_color);
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$result = image_gd_close($res, $destination, $info['extension']);
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return $result;
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}
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/**
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* Crop an image using the GD toolkit.
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*/
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function image_gd_crop($source, $destination, $x, $y, $width, $height) {
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$info = image_get_info($source);
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if (!$info) {
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return false;
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}
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$im = image_gd_open($source, $info['extension']);
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// GD1 doesn't have true color
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if (function_exists('imageCreateTrueColor')) {
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$res = imageCreateTrueColor($width, $height);
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}
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else {
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$res = imageCreate($width, $height);
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}
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imageCopy($im, $res, 0, 0, $x, $y, $width, $height);
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$result = image_gd_close($res, $destination, $info['extension']);
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imageDestroy($res);
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imageDestroy($im);
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return $result;
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}
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/**
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* GD helper function to create an image resource from a file.
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*/
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function image_gd_open($file, $extension) {
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$extension = str_replace('jpg', 'jpeg', $extension);
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$open_func = 'imageCreateFrom'. $extension;
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if (!function_exists($open_func)) {
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return false;
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}
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return $open_func($file);
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}
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/**
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* GD helper to write an image resource to a destination file.
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*/
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function image_gd_close($res, $destination, $extension) {
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$extension = str_replace('jpg', 'jpeg', $extension);
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$close_func = 'image'. $extension;
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if (!function_exists($close_func)) {
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return false;
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}
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return $close_func($res, $destination);
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}
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?>
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