Always generate avatar
Even if no avatar is set we should just generate the image. This to not duplicate the code on all the clients. And only server images from the avtar endpoint. Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
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Roeland Jago Douma
parent
6097b74970
commit
604596ec16
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@ -111,6 +111,136 @@ class AvatarController extends Controller {
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$this->timeFactory = $timeFactory;
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}
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/**
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* @param int $r
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* @param int $g
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* @param int $b
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* @return double[] Array containing h s l in [0, 1] range
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*/
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private function rgbToHsl($r, $g, $b) {
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$r /= 255.0;
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$g /= 255.0;
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$b /= 255.0;
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$max = max($r, $g, $b);
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$min = min($r, $g, $b);
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$h = ($max + $min) / 2.0;
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$l = ($max + $min) / 2.0;
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if($max === $min) {
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$h = $s = 0; // Achromatic
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} else {
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$d = $max - $min;
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$s = $l > 0.5 ? $d / (2 - $max - $min) : $d / ($max + $min);
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switch($max) {
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case $r:
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$h = ($g - $b) / $d + ($g < $b ? 6 : 0);
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break;
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case $g:
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$h = ($b - $r) / $d + 2.0;
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break;
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case $b:
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$h = ($r - $g) / $d + 4.0;
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break;
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}
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$h /= 6.0;
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}
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return [$h, $s, $l];
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}
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/**
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* @param string $text
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* @return int[] Array containting r g b in the range [0, 255]
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*/
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private function avatarBackgroundColor($text) {
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$hash = preg_replace('/[^0-9a-f]+/', '', $text);
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$hash = md5($hash);
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$hashChars = str_split($hash);
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// Init vars
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$result = ['0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0'];
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$rgb = [0, 0, 0];
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$sat = 0.70;
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$lum = 0.68;
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$modulo = 16;
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// Splitting evenly the string
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foreach($hashChars as $i => $char) {
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$result[$i % $modulo] .= intval($char, 16);
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}
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// Converting our data into a usable rgb format
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// Start at 1 because 16%3=1 but 15%3=0 and makes the repartition even
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for($count = 1; $count < $modulo; $count++) {
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$rgb[$count%3] += (int)$result[$count];
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}
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// Reduce values bigger than rgb requirements
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$rgb[0] %= 255;
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$rgb[1] %= 255;
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$rgb[2] %= 255;
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$hsl = $this->rgbToHsl($rgb[0], $rgb[1], $rgb[2]);
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// Classic formulla to check the brigtness for our eye
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// If too bright, lower the sat
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$bright = sqrt(0.299 * ($rgb[0] ** 2) + 0.587 * ($rgb[1] ** 2) + 0.114 * ($rgb[2] ** 2));
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if ($bright >= 200) {
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$sat = 0.60;
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}
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return $this->hslToRgb($hsl[0], $sat, $lum);
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}
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/**
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* @param double $h Heu in range [0, 1]
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* @param double $s Saturation in range [0, 1]
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* @param double $l Lightness in range [0, 1]
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* @return int[] Array containging r g b in the range [0, 255]
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*/
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private function hslToRgb($h, $s, $l){
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$hue2rgb = function ($p, $q, $t){
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if($t < 0) {
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$t += 1;
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}
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if($t > 1) {
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$t -= 1;
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}
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if($t < 1/6) {
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return $p + ($q - $p) * 6 * $t;
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}
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if($t < 1/2) {
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return $q;
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}
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if($t < 2/3) {
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return $p + ($q - $p) * (2/3 - $t) * 6;
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}
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return $p;
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};
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if($s == 0){
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$r = $l;
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$g = $l;
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$b = $l; // achromatic
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}else{
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$q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s;
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$p = 2 * $l - $q;
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$r = $hue2rgb($p, $q, $h + 1/3);
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$g = $hue2rgb($p, $q, $h);
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$b = $hue2rgb($p, $q, $h - 1/3);
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}
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return array(round($r * 255), round($g * 255), round($b * 255));
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}
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/**
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* @NoAdminRequired
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* @NoCSRFRequired
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@ -135,11 +265,31 @@ class AvatarController extends Controller {
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['Content-Type' => $avatar->getMimeType()]);
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} catch (NotFoundException $e) {
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$user = $this->userManager->get($userId);
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$resp = new JSONResponse([
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'data' => [
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'displayname' => $user->getDisplayName(),
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],
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]);
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$userDisplayName = $user->getDisplayName();
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$text = strtoupper(substr($userDisplayName, 0, 1));
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$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
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$im = imagecreatetruecolor($size, $size);
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$background = imagecolorallocate($im, $backgroundColor[0], $backgroundColor[1], $backgroundColor[2]);
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$white = imagecolorallocate($im, 255, 255, 255);
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imagefilledrectangle($im, 0, 0, $size, $size, $background);
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$font = __DIR__ . '/../../core/fonts/OpenSans-Light.woff';
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$fontSize = $size * 0.4;
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$box = imagettfbbox($fontSize, 0, $font, $text);
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$x = ($size - ($box[2] - $box[0])) / 2;
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$y = ($size - ($box[1] - $box[7])) / 2;
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$y -= $box[7];
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imagettftext($im, $fontSize, 0, $x, $y, $white, $font, $text);
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header('Content-Type: image/png');
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imagepng($im);
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imagedestroy($im);
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exit();
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} catch (\Exception $e) {
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$resp = new JSONResponse([
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'data' => [
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