Library 4 Web

// Saves an image file resized to the dimensions specified. If new_filename is specified then the output will // be saved to that destination, if not, it will overwrite the existing image. The image will be converted to // jpeg if the format can be opened but not saved in its native format. function image_save_resized($image_filename, $width, $height, $new_filename = false, $jpeg_quality = 100, $centre_image = false, $background_colour = array(255, 255, 255)) { if(!is_file($image_filename)) { trigger_error("image_save_resized(): Failed to locate {$image_filename}; it does not exist!", E_USER_WARNING); return false; } // Prevents accidental misordering of the jpeg_quality parameter if(!is_int($jpeg_quality)) { trigger_error("image_save_reized(): jpeg_quality should be an integer between 1 and 100", E_USER_WARNING); return false; } // Validate the background colour parameter if(!is_array($background_colour) || count($background_colour) != 3) { trigger_error("image_save_resized(): background_colour should be array in the form array((int) r, (int) g, (int) b)", E_USER_WARNING); return false; } // Validate the size parameters if(($width <= 0 || $height <= 0) || (!is_int($width) || !is_int($height))) { trigger_error("image_save_resized(): cannot resize to " . intval($width) . " x " . intval($height) . ", invalid dimensions"); return false; } // Get image attributes and work out the resizing. list($img_width, $img_height, $type, $attr) = $image_info = getimagesize($image_filename); switch($image_info['mime']) { // Supported formates can be opened case "image/jpeg": $source = ImageCreateFromJPEG($image_filename); break; case "image/gif": $source = imagecreatefromgif($image_filename); break; case "image/png": $source = imagecreatefrompng($image_filename); break; case "image/bmp": $source = imagecreatefromwbmp($image_filename); break; // Unsupported format default: trigger_error("image_save_resized(): Image format not supported ({$image_info['mime']})!"); return false; } $ratio = 1; $new_width = $img_width; $new_height = $img_height; // Loops continuously trying different sizes until the perfect fit is found. while($new_width > $width || $new_height > $height) { if($new_width > $width) { $ratio = $new_width / $width; } else if($new_height > $height) { $ratio = $img_height / $height; } if($ratio === 0) { trigger_error("image_save_resized(): Error recalculating image size."); return false; } $new_width = floor($img_width / $ratio); $new_height = floor($img_height / $ratio); } // Create our target image if($centre_image) { $new_image = imagecreatetruecolor($width, $height); if($width != $new_width || $height != $new_height) { imagefilledrectangle($new_image, 0, 0, $width, $height, imagecolorallocate($new_image, $background_colour[0], $background_colour[1], $background_colour[2])); $centre_x = round($width / 2); $centre_y = round($height / 2); $image_centre_x = round($new_width / 2); $image_centre_y = round($new_height / 2); $new_image_x = $centre_x - $image_centre_x; $new_image_y = $centre_y - $image_centre_y; } else { $new_image_x = 0; $new_image_y = 0; } } else { $new_image = imagecreatetruecolor($new_width,$new_height); $new_image_x = 0; $new_image_y = 0; } // Resize the image imagecopyresampled($new_image, $source, $new_image_x, $new_image_y, 0, 0, $new_width, $new_height, $img_width, $img_height); // Determine the filename to save to $output_filename = ($new_filename) ? $new_filename : $image_filename; if(is_file($output_filename)) unlink($output_filename); switch($image_info['mime']) { // Supported formats can be saved case "image/jpeg": $source = imagejpeg($new_image,$output_filename,$jpeg_quality); break; case "image/gif": $source = imagegif($new_image,$output_filename); break; case "image/png": $source = imagepng($new_image,$output_filename); break; case "image/bmp": $source = imagewbmp($new_image,$output_filename); break; // Unsupported format default: $source = imagejpeg($new_image,$output_filename,$jpeg_quality); break; } // Clean up imagedestroy($new_image); return true; }