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Viewing: icon.php

<?php
$srcPath = __DIR__ . '/images/favicon.png';
$size = isset($_GET['size']) ? intval($_GET['size']) : 512;
if ($size < 48) $size = 48;
if ($size > 1024) $size = 1024;
$maskable = isset($_GET['maskable']);
if (!file_exists($srcPath) || !function_exists('imagecreatetruecolor')) {
  header('Location: images/favicon.png');
  exit;
}
$img = @imagecreatefrompng($srcPath);
if (!$img) {
  $data = @file_get_contents($srcPath);
  if ($data === false) {
    header('Location: images/favicon.png');
    exit;
  }
  $img = @imagecreatefromstring($data);
  if (!$img) {
    header('Location: images/favicon.png');
    exit;
  }
}
$w = imagesx($img);
$h = imagesy($img);
$canvas = imagecreatetruecolor($size, $size);
imagealphablending($canvas, false);
imagesavealpha($canvas, true);
$transparent = imagecolorallocatealpha($canvas, 0, 0, 0, 127);
imagefill($canvas, 0, 0, $transparent);
$padRatio = $maskable ? 0.04 : 0.0;
$pad = (int)round($size * $padRatio);
$available = max(1, $size - 2 * $pad);
$scale = min($available / max(1, $w), $available / max(1, $h));
$dstW = max(1, (int)round($w * $scale));
$dstH = max(1, (int)round($h * $scale));
$dstX = (int)round(($size - $dstW) / 2);
$dstY = (int)round(($size - $dstH) / 2);
imagealphablending($canvas, true);
imagecopyresampled($canvas, $img, $dstX, $dstY, 0, 0, $dstW, $dstH, $w, $h);
imagedestroy($img);
header('Content-Type: image/png');
imagepng($canvas, null, 9);
imagedestroy($canvas);

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