function generateIdenticon($iUserId, $iUserImageDefaultSize = 64)
{
$avatarhash = md5($iUserId);
#error_log( "\$avatarhash: $avatarhash" );
$avatarsize = $iUserImageDefaultSize;
/* parse hash string */
$csh = hexdec(substr($avatarhash, 0, 1));
// corner sprite shape
$ssh = hexdec(substr($avatarhash, 1, 1));
// side sprite shape
$xsh = hexdec(substr($avatarhash, 2, 1)) & 7;
// center sprite shape
$cro = hexdec(substr($avatarhash, 3, 1)) & 3;
// corner sprite rotation
$sro = hexdec(substr($avatarhash, 4, 1)) & 3;
// side sprite rotation
$xbg = hexdec(substr($avatarhash, 5, 1)) % 2;
// center sprite background
/* corner sprite foreground color */
$cfr = hexdec(substr($avatarhash, 6, 2));
$cfg = hexdec(substr($avatarhash, 8, 2));
$cfb = hexdec(substr($avatarhash, 10, 2));
/* side sprite foreground color */
$sfr = hexdec(substr($avatarhash, 12, 2));
$sfg = hexdec(substr($avatarhash, 14, 2));
$sfb = hexdec(substr($avatarhash, 16, 2));
/* final angle of rotation */
$angle = hexdec(substr($avatarhash, 18, 2));
/* size of each sprite */
$spriteZ = 128;
/* start with blank 3x3 identicon */
$identicon = imagecreatetruecolor($spriteZ * 3, $spriteZ * 3);
imageantialias($identicon, TRUE);
/* assign white as background */
$bg = imagecolorallocate($identicon, 255, 255, 255);
imagefilledrectangle($identicon, 0, 0, $spriteZ, $spriteZ, $bg);
/* generate corner sprites */
$corner = getsprite($csh, $cfr, $cfg, $cfb, $cro, $spriteZ);
imagecopy($identicon, $corner, 0, 0, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, 0, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, 0, 0, 0, $spriteZ, $spriteZ);
/* generate side sprites */
$side = getsprite($ssh, $sfr, $sfg, $sfb, $sro, $spriteZ);
imagecopy($identicon, $side, $spriteZ, 0, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, 0, $spriteZ, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ * 2, $spriteZ, 0, 0, $spriteZ, $spriteZ);
/* generate center sprite */
$center = getcenter($xsh, $cfr, $cfg, $cfb, $sfr, $sfg, $sfb, $xbg, $spriteZ);
imagecopy($identicon, $center, $spriteZ, $spriteZ, 0, 0, $spriteZ, $spriteZ);
// $identicon=imagerotate($identicon,$angle,$bg);
/* make white transparent */
imagecolortransparent($identicon, $bg);
/* create blank image according to specified dimensions */
$resized = imagecreatetruecolor($avatarsize, $avatarsize);
imageantialias($resized, TRUE);
/* assign white as background */
$bg = imagecolorallocate($resized, 255, 255, 255);
imagefilledrectangle($resized, 0, 0, $avatarsize, $avatarsize, $bg);
/* resize identicon according to specification */
imagecopyresampled($resized, $identicon, 0, 0, (imagesx($identicon) - $spriteZ * 3) / 2, (imagesx($identicon) - $spriteZ * 3) / 2, $avatarsize, $avatarsize, $spriteZ * 3, $spriteZ * 3);
/* make white transparent */
imagecolortransparent($resized, $bg);
/* and finally, send to standard output */
#header("Content-Type: image/png");
#imagepng($resized);
// Enable output buffering
ob_start();
// Stream raw PNG image data
imagepng($resized);
// Capture the output
$rawpngidenticon = ob_get_contents();
// Clear the output buffer
ob_end_clean();
return $rawpngidenticon;
}
$identicon = imagecreatetruecolor($spriteZ * 3, $spriteZ * 3); imageantialias($identicon, TRUE); /* assign white as background */ $bg = imagecolorallocate($identicon, 255, 255, 255); imagefilledrectangle($identicon, 0, 0, $spriteZ, $spriteZ, $bg); /* generate corner sprites */ $corner = getsprite($csh, $cfr, $cfg, $cfb, $cro); imagecopy($identicon, $corner, 0, 0, 0, 0, $spriteZ, $spriteZ); $corner = imagerotate($corner, 90, $bg); imagecopy($identicon, $corner, 0, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ); $corner = imagerotate($corner, 90, $bg); imagecopy($identicon, $corner, $spriteZ * 2, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ); $corner = imagerotate($corner, 90, $bg); imagecopy($identicon, $corner, $spriteZ * 2, 0, 0, 0, $spriteZ, $spriteZ); /* generate side sprites */ $side = getsprite($ssh, $sfr, $sfg, $sfb, $sro); imagecopy($identicon, $side, $spriteZ, 0, 0, 0, $spriteZ, $spriteZ); $side = imagerotate($side, 90, $bg); imagecopy($identicon, $side, 0, $spriteZ, 0, 0, $spriteZ, $spriteZ); $side = imagerotate($side, 90, $bg); imagecopy($identicon, $side, $spriteZ, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ); $side = imagerotate($side, 90, $bg); imagecopy($identicon, $side, $spriteZ * 2, $spriteZ, 0, 0, $spriteZ, $spriteZ); /* generate center sprite */ $center = getcenter($xsh, $cfr, $cfg, $cfb, $sfr, $sfg, $sfb, $xbg); imagecopy($identicon, $center, $spriteZ, $spriteZ, 0, 0, $spriteZ, $spriteZ); // $identicon=imagerotate($identicon,$angle,$bg); /* make white transparent */ imagecolortransparent($identicon, $bg); /* create blank image according to specified dimensions */ $resized = imagecreatetruecolor($_GET["size"], $_GET["size"]);
function identicon($name, $size = 48)
{
global $spriteZ;
/* hash name */
$hash = md5($name);
/* parse hash string */
$csh = hexdec(substr($hash, 0, 1));
// corner sprite shape
$ssh = hexdec(substr($hash, 1, 1));
// side sprite shape
$xsh = hexdec(substr($hash, 2, 1)) & 7;
// center sprite shape
$cro = hexdec(substr($hash, 3, 1)) & 3;
// corner sprite rotation
$sro = hexdec(substr($hash, 4, 1)) & 3;
// side sprite rotation
$xbg = hexdec(substr($hash, 5, 1)) % 2;
// center sprite background
/* corner sprite foreground color */
$cfr = hexdec(substr($hash, 6, 2));
$cfg = hexdec(substr($hash, 8, 2));
$cfb = hexdec(substr($hash, 10, 2));
/* side sprite foreground color */
$sfr = hexdec(substr($hash, 12, 2));
$sfg = hexdec(substr($hash, 14, 2));
$sfb = hexdec(substr($hash, 16, 2));
/* final angle of rotation */
$angle = hexdec(substr($hash, 18, 2));
/* size of each sprite */
$spriteZ = 128;
/* start with blank 3x3 identicon */
$identicon = imagecreatetruecolor($spriteZ * 3, $spriteZ * 3);
// imageantialias($identicon,TRUE);
/* assign white as background */
$bg = imagecolorallocate($identicon, 255, 255, 255);
imagefilledrectangle($identicon, 0, 0, $spriteZ, $spriteZ, $bg);
/* generate corner sprites */
$corner = getsprite($csh, $cfr, $cfg, $cfb, $cro);
imagecopy($identicon, $corner, 0, 0, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, 0, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, 0, 0, 0, $spriteZ, $spriteZ);
/* generate side sprites */
$side = getsprite($ssh, $sfr, $sfg, $sfb, $sro);
imagecopy($identicon, $side, $spriteZ, 0, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, 0, $spriteZ, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ * 2, $spriteZ, 0, 0, $spriteZ, $spriteZ);
/* generate center sprite */
$center = getcenter($xsh, $cfr, $cfg, $cfb, $sfr, $sfg, $sfb, $xbg);
imagecopy($identicon, $center, $spriteZ, $spriteZ, 0, 0, $spriteZ, $spriteZ);
$identicon = imagerotate($identicon, $angle, $bg);
/* make white transparent */
imagecolortransparent($identicon, $bg);
/* create blank image according to specified dimensions */
$resized = imagecreatetruecolor($size, $size);
// imageantialias($resized,TRUE);
/* assign white as background */
$bg = imagecolorallocate($resized, 255, 255, 255);
imagefilledrectangle($resized, 0, 0, $size, $size, $bg);
/* resize identicon according to specification */
imagecopyresampled($resized, $identicon, 0, 0, (imagesx($identicon) - $spriteZ * 3) / 2, (imagesx($identicon) - $spriteZ * 3) / 2, $size, $size, $spriteZ * 3, $spriteZ * 3);
/* make white transparent */
imagecolortransparent($resized, $bg);
/* return image */
return $resized;
}
