feat: generate avatars for display name with chinese characters

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

Author: kesselb

core/fonts/NotoSansSC-Bold.ttf

@@ -100,19 +100,7 @@ public function get(int $size = 64, bool $darkTheme = false) {
 		return $avatar;
 	}
 
-	/**
-	 * {size} = 500
-	 * {fill} = hex color to fill
-	 * {letter} = Letter to display
-	 *
-	 * Generate SVG avatar
-	 *
-	 * @param int $size The requested image size in pixel
-	 * @return string
-	 *
-	 */
-	protected function getAvatarVector(int $size, bool $darkTheme): string {
-		$userDisplayName = $this->getDisplayName();
+	protected function getAvatarVector(string $userDisplayName, int $size, bool $darkTheme): string {
 		$fgRGB = $this->avatarBackgroundColor($userDisplayName);
 		$bgRGB = $fgRGB->alphaBlending(0.1, $darkTheme ? new Color(0, 0, 0) : new Color(255, 255, 255));
 		$fill = sprintf("%02x%02x%02x", $bgRGB->red(), $bgRGB->green(), $bgRGB->blue());
@@ -122,6 +110,14 @@ protected function getAvatarVector(int $size, bool $darkTheme): string {
 		return str_replace($toReplace, [$size, $fill, $fgFill, $text], $this->svgTemplate);
 	}
 
+	protected function getFont(string $userDisplayName) {
+		if (preg_match('/\p{Han}/u', $userDisplayName) === 1) {
+			return __DIR__ . '/../../../core/fonts/NotoSansSC-Regular.ttf';
+		}
+
+		return __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
+	}
+
 	/**
 	 * Generate png avatar from svg with Imagick
 	 */
@@ -134,9 +130,12 @@ protected function generateAvatarFromSvg(int $size, bool $darkTheme): ?string {
 		if (in_array("RSVG", $formats, true)) {
 			return null;
 		}
+
+		$userDisplayName = $this->getDisplayName();
+		$font = $this->getFont($userDisplayName);
+
 		try {
-			$font = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
-			$svg = $this->getAvatarVector($size, $darkTheme);
+			$svg = $this->getAvatarVector($userDisplayName, $size, $darkTheme);
 			$avatar = new Imagick();
 			$avatar->setFont($font);
 			$avatar->readImageBlob($svg);
@@ -178,7 +177,8 @@ protected function generateAvatar(string $userDisplayName, int $size, bool $dark
 		}
 		imagefilledrectangle($im, 0, 0, $size, $size, $background);
 
-		$font = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
+
+		$font = $this->getFont($userDisplayName);
 
 		$fontSize = $size * 0.4;
 		[$x, $y] = $this->imageTTFCenter(