Php create text image with transparent background

PHP - Add transparent text watermark to an image to make it binary unique

This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters

<?php /* Placehold transparent image * image.php/{title}-{width}x{height}-{hexcolor}.[png|jpeg|gif|webp|xbm|wbmp|gd|gd2] * * @require: php_gd2, */ header('Last-Modified: ' . gmdate('D, d M Y H:i:s T', filemtime(__FILE__))); if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= filemtime(__FILE__)) { header('HTTP/1.0 304 Not Modified'); exit; } function hex2rgb($hex) { $rgb = str_split($hex,strlen($hex)>4?2:1); count($rgb)-1?:$rgb = str_split('cccc',1); strlen($hex)>4?array_walk($rgb,function($val,$key) use(&$rgb){ $rgb[$key] = hexdec($val); }):array_walk($rgb,function($val,$key) use(&$rgb){ $rgb[$key] = hexdec($val.(count($val)<2?'0':'')); }); if(isset($rgb[3])){ $rgb[3] = round(($rgb[3]/255)*100)/100; } return $rgb; } function rgb2hex($rgb) { $rgb1 = array(($rgb[0]<16?'0':'').dechex($rgb[0]),($rgb[1]<16?'0':'').dechex($rgb[1]),($rgb[2]<16?'0':'').dechex($rgb[2])); if(isset($rgb[3])){ $rgb1[3] = (round($rgb[3]*255)<16?'0':'').dechex(round($rgb[3]*255)); } return join('',$rgb1); //return join('',dechex(($rgb[0]<<16)|($rgb[1]<<8)|$rgb[2])); } function invertRGB($rgb) { $rgb1 = array(255-$rgb[0],255-$rgb[1],255-$rgb[2]); if(isset($rgb[3])){ $rgb1[3] = 1-$rgb[3]; } return $rgb1; } $uri = @$_GET?:@$_POST; if(!@$uri)preg_match('/(\d+)x(\d+)?(-[0-9a-fA-F]{3,8})?(\.\w+)?/',$_SERVER['PATH_INFO'],$uri, PREG_OFFSET_CAPTURE); header("X-uri: ".json_encode($uri)); header("X-PATH_INFO: ".json_encode($_SERVER['PATH_INFO'])); // Width $w = (int) (@$uri['w']?:@$uri[1][0]?:100); // Height $h = (int) (@$uri['h']?:@$uri[2][0]?:100); // Title preg_match('/^\/([\w\s\:]+)?/',urldecode($_SERVER['PATH_INFO']),$text, PREG_OFFSET_CAPTURE); $text = (string) (@$uri['t']?:@$text[1][0]?:$w."x".$h); header("X-text: ".json_encode($text)); // Color $hex = (string) substr(@$uri['c']?:@$uri[3][0],1); $rgb = hex2rgb($hex); if($rgb[3]==1){array_pop($rgb);} $fgrgb = invertRGB($rgb); if(isset($rgb[3])){ $fgrgb[3] = 0.5; } $fghex = rgb2hex($fgrgb); // mime-type $m = (string) (@$uri['m']?:substr(@$uri[4][0],1)?:'png'); header("Content-Type: image/".$m); $image = @imagecreatetruecolor($w, $h) or die("Cannot Initialize new GD image stream"); $image = @imagecreate($w, $h) or die("Cannot Initialize new GD image stream"); $bg = ($m=='jpg'||$m=='webp'||!isset($rgb[3]))?imagecolorallocate($image,$rgb[0], $rgb[1], $rgb[2]):imagecolorallocatealpha($image,$rgb[0], $rgb[1], $rgb[2],127-round($rgb[3]*127)); $fg = ($m=='jpg'||$m=='webp'||!isset($rgb[3]))?imagecolorallocate($image,$fgrgb[0], $fgrgb[1], $fgrgb[2]):imagecolorallocatealpha($image,$fgrgb[0], $fgrgb[1], $fgrgb[2],127-round($fgrgb[3]*127)); //imagealphablending($image,false); //imagesavealpha($image,true); //imagefill($image,0,0,$bg); $font = 'Anonymous.ttf'; $fontSize = $w/2/strlen($text); $capHeight = $fontSize; $descenderHeight = $capHeight*1/2; $letterWidth = (int)($capHeight); $letterHeight = $capHeight+$descenderHeight; $letterSpace = (int)($capHeight*8/2); $lineSpace = $descenderHeight; $x = $w/2-strlen($text)*$letterWidth/2; $y = $h/2+$capHeight/2; $textWidth = strlen($text)*($letterWidth+$letterSpace); if($letterWidth+$x <= $w && $capHeight+$y <= $h){ imagettftext($image, $fontSize, 0, $x, $y, $fg, $font, $text); } $fontSize = 1; $capHeight = 5 * $fontSize; $descenderHeight = $capHeight*0.5; $letterWidth = (int)($capHeight*8/6); $letterHeight = $capHeight+$descenderHeight; $letterSpace = 2; $lineSpace = $descenderHeight; $y += $letterHeight+$lineSpace; $text = "x = 4x4px"; $textWidth = strlen($text)*($letterWidth+$letterSpace); if($w >= $x+$textWidth && $h >= $y+$letterHeight+$lineSpace && true){ imagestring($image, $fontSize, $x, $y, $text , $fg); } $y += $letterHeight+$lineSpace; $text = "Background-Color: #".$hex.', rgb'.(isset($rgb[3])?'a':'').'('. $rgb[0].', '.$rgb[1].', '.$rgb[2].(isset($rgb[3])?', '.$rgb[3]:'').')'; header($text); $textWidth = strlen($text)*($letterWidth+$letterSpace); if($w >= $x+$textWidth && $h >= $y+$letterHeight+$lineSpace && true){ imagestring($image, $fontSize, $x, $y, $text , $fg); } $y += $letterHeight+$lineSpace; $text = "Color: #".$fghex.', rgb'.(isset($fgrgb[3])?'a':'').'('. $fgrgb[0].', '.$fgrgb[1].', '.$fgrgb[2].(isset($fgrgb[3])?', '.$fgrgb[3]:'').')'; header($text); $textWidth = strlen($text)*($letterWidth+$letterSpace); if($w >= $x+$textWidth && $h >= $y+$letterHeight+$lineSpace && true){ imagestring($image, $fontSize, $x, $y, $text , $fg); } $y += $letterHeight+$lineSpace; $text = "Width: ".$w."px"; header($text); $textWidth = strlen($text)*($letterWidth+$letterSpace); if($w >= $x+$textWidth && $h >= $y+$letterHeight+$lineSpace && true){ imagestring($image, $fontSize, $x, $y, $text , $fg); } $y += $letterHeight+$lineSpace; $text = "Height: ".$h."px"; header($text); $textWidth = strlen($text)*($letterWidth+$letterSpace); if($w >= $x+$textWidth && $h >= $y+$letterHeight+$lineSpace && true){ imagestring($image, $fontSize, $x, $y, $text , $fg); } call_user_func('image'.$m,$image); imagedestroy($image);