Image generating utility functions

img.inc.php

<?php
function textImage($msg = "No message") {
	$char_size = 3;		// Which standard font size?
	$char_height = 35;	// How tall is a line?
	$char_width = 7;	// How wide is each character?

	// Determine width based on string length
	$width = strlen($msg)*$char_width+30;

	// Create a blank image to draw on
	$im = @imagecreatetruecolor($width, $char_height) or die("Cannot Initialize new GD image stream");
	$bg = imagecolorallocate($im, 250, 230, 230);
	imagefill($im, 0, 0, $bg);
	$text_color = imagecolorallocate($im, 233, 14, 91);

	// Write messgae
	imagestring($im, 3, 15, 10,  $msg, $text_color);

	// Export the final image
	header ("Content-type: image/png");
	imagepng($im);
	imagedestroy($im);
}

function debug($msg) {
	if (isset($_GET['debug']) || isset($_POST['debug'])) {
		echo $msg;
	}
}

putenv('GDFONTPATH='.realpath("../fonts/")); // Define where the fonts are

istransparent.php

<?php
// Image transparency checker
if (empty($_GET['img'])) exit("-1"); // No file specified
$img_file = $_GET['img'];

if (!file_exists($img_file)) exit("-1"); // File doesn't exist
if (!is_readable($img_file)) exit("-1"); // Cannot read file
$img = imagecreatefrompng($img_file) or exit("-1");
if (!$img) exit("-1");

$x = (!empty($_GET['x']) && is_numeric($_GET['y']) && intval($_GET['x']) > 0)? intval($_GET['x']) : 0;
$y = (!empty($_GET['y']) && is_numeric($_GET['y']) && intval($_GET['y']) > 0)? intval($_GET['y']) : 0;
if ($x > imagesx($img)) exit("-1"); // too wide
if ($y > imagesy($img)) exit("-1"); // too tall

$index = imagecolorat($img, $x, $y);
if (imagecolorsforindex($img, $index) == NULL) {
	$alpha = ($index >> 24) & 0xFF;
} else {
	$color = imagecolorsforindex($img, $index);
	$alpha = $color['alpha'];
}
if ($alpha > 102) {
	exit("1");
} else {
	exit("0");
}

rotated.php

<?php
// Create rotated text header
$msg = (isset($_GET['msg']) && $_GET['msg'] != "")? $_GET['msg'] : "Text Label";
$w = 6;
$h = 12;
$x = $h+2;
$y = $w*strlen($msg)+2;
$im = imagecreatetruecolor($x, $y);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

imagefill($im, 1, 1, $white);
imagestringup($im, 2, 0, $y-2, $msg, $black);

header ("Content-type: image/png");
imagepng($im);