Avatar new style

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

4 files changed, 65 insertions, 32 deletions

diff --git a/lib/private/Avatar/Avatar.php b/lib/private/Avatar/Avatar.php
index 0eb8f8816d8..aec0f6e10f4 100644
--- a/lib/private/Avatar/Avatar.php
+++ b/lib/private/Avatar/Avatar.php
@@ -59,7 +59,7 @@ abstract class Avatar implements IAvatar {
 	private string $svgTemplate = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 		<svg width="{size}" height="{size}" version="1.1" viewBox="0 0 500 500" xmlns="http://www.w3.org/2000/svg">
 			<rect width="100%" height="100%" fill="#{fill}"></rect>
-			<text x="50%" y="350" style="font-weight:normal;font-size:280px;font-family:\'Noto Sans\';text-anchor:middle;fill:#fff">{letter}</text>
+			<text x="50%" y="350" style="font-weight:normal;font-size:280px;font-family:\'Noto Sans\';text-anchor:middle;fill:#{fgFill}">{letter}</text>
 		</svg>';
 
 	public function __construct(LoggerInterface $logger) {
@@ -88,9 +88,9 @@ abstract class Avatar implements IAvatar {
 	/**
 	 * @inheritdoc
 	 */
-	public function get(int $size = 64) {
+	public function get(int $size = 64, bool $darkTheme = false) {
 		try {
-			$file = $this->getFile($size);
+			$file = $this->getFile($size, $darkTheme);
 		} catch (NotFoundException $e) {
 			return false;
 		}
@@ -111,25 +111,27 @@ abstract class Avatar implements IAvatar {
 	 * @return string
 	 *
 	 */
-	protected function getAvatarVector(int $size): string {
+	protected function getAvatarVector(int $size, bool $dark): string {
 		$userDisplayName = $this->getDisplayName();
-		$bgRGB = $this->avatarBackgroundColor($userDisplayName);
-		$bgHEX = sprintf("%02x%02x%02x", $bgRGB->red(), $bgRGB->green(), $bgRGB->blue());
+		$fgRGB = $this->avatarBackgroundColor($userDisplayName);
+		$bgRGB = $fgRGB->alphaBlending(0.1, $dark ? new Color(0, 0, 0) : new Color(255, 255, 255));
+		$fill = sprintf("%02x%02x%02x", $bgRGB->red(), $bgRGB->green(), $bgRGB->blue());
+		$fgFill = sprintf("%02x%02x%02x", $fgRGB->red(), $fgRGB->green(), $fgRGB->blue());
 		$text = $this->getAvatarText();
-		$toReplace = ['{size}', '{fill}', '{letter}'];
-		return str_replace($toReplace, [$size, $bgHEX, $text], $this->svgTemplate);
+		$toReplace = ['{size}', '{fill}', '{fgFill}', '{letter}'];
+		return str_replace($toReplace, [$size, $fill, $fgFill, $text], $this->svgTemplate);
 	}
 
 	/**
 	 * Generate png avatar from svg with Imagick
 	 */
-	protected function generateAvatarFromSvg(int $size): ?string {
+	protected function generateAvatarFromSvg(int $size, bool $dark): ?string {
 		if (!extension_loaded('imagick')) {
 			return null;
 		}
 		try {
-			$font = __DIR__ . '/../../core/fonts/NotoSans-Regular.ttf';
-			$svg = $this->getAvatarVector($size);
+			$font = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
+			$svg = $this->getAvatarVector($size, $dark);
 			$avatar = new Imagick();
 			$avatar->setFont($font);
 			$avatar->readImageBlob($svg);
@@ -145,9 +147,10 @@ abstract class Avatar implements IAvatar {
 	/**
 	 * Generate png avatar with GD
 	 */
-	protected function generateAvatar(string $userDisplayName, int $size): string {
+	protected function generateAvatar(string $userDisplayName, int $size, bool $dark): string {
 		$text = $this->getAvatarText();
-		$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
+		$textColor = $this->avatarBackgroundColor($userDisplayName);
+		$backgroundColor = $textColor->alphaBlending(0.1, $dark ? new Color() : new Color(255, 255, 255));
 
 		$im = imagecreatetruecolor($size, $size);
 		$background = imagecolorallocate(
@@ -156,7 +159,11 @@ abstract class Avatar implements IAvatar {
 			$backgroundColor->green(),
 			$backgroundColor->blue()
 		);
-		$white = imagecolorallocate($im, 255, 255, 255);
+		$textColor = imagecolorallocate($im,
+			$textColor->red(),
+			$textColor->green(),
+			$textColor->blue()
+		);
 		imagefilledrectangle($im, 0, 0, $size, $size, $background);
 
 		$font = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
@@ -166,7 +173,7 @@ abstract class Avatar implements IAvatar {
 			$im, $text, $font, (int)$fontSize
 		);
 
-		imagettftext($im, $fontSize, 0, $x, $y, $white, $font, $text);
+		imagettftext($im, $fontSize, 0, $x, $y, $textColor, $font, $text);
 
 		ob_start();
 		imagepng($im);
diff --git a/lib/private/Avatar/UserAvatar.php b/lib/private/Avatar/UserAvatar.php
index f5a1d7e77b1..02fcfcb0fc8 100644
--- a/lib/private/Avatar/UserAvatar.php
+++ b/lib/private/Avatar/UserAvatar.php
@@ -208,7 +208,14 @@ class UserAvatar extends Avatar {
 	 *
 	 * @throws NotFoundException
 	 */
-	private function getExtension(): string {
+	private function getExtension(bool $generated, bool $darkTheme): string {
+		if ($darkTheme && !$generated) {
+			if ($this->folder->fileExists('avatar-dark.jpg')) {
+				return 'jpg';
+			} elseif ($this->folder->fileExists('avatar-dark.png')) {
+				return 'png';
+			}
+		}
 		if ($this->folder->fileExists('avatar.jpg')) {
 			return 'jpg';
 		} elseif ($this->folder->fileExists('avatar.png')) {
@@ -228,25 +235,36 @@ class UserAvatar extends Avatar {
 	 * @throws \OCP\Files\NotPermittedException
 	 * @throws \OCP\PreConditionNotMetException
 	 */
-	public function getFile(int $size): ISimpleFile {
+	public function getFile(int $size, bool $darkTheme = false): ISimpleFile {
+		$generated = $this->folder->fileExists('generated');
+
 		try {
-			$ext = $this->getExtension();
+			$ext = $this->getExtension($generated, $darkTheme);
 		} catch (NotFoundException $e) {
-			if (!$data = $this->generateAvatarFromSvg(1024)) {
-				$data = $this->generateAvatar($this->getDisplayName(), 1024);
+			if (!$data = $this->generateAvatarFromSvg(1024, $darkTheme)) {
+				$data = $this->generateAvatar($this->getDisplayName(), 1024, $darkTheme);
 			}
-			$avatar = $this->folder->newFile('avatar.png');
+			$avatar = $this->folder->newFile($darkTheme ? 'avatar-dark.png' : 'avatar.png');
 			$avatar->putContent($data);
 			$ext = 'png';
 
 			$this->folder->newFile('generated', '');
 			$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', 'true');
+			$generated = true;
 		}
 
-		if ($size === -1) {
-			$path = 'avatar.' . $ext;
+		if ($generated) {
+			if ($size === -1) {
+				$path = 'avatar' . ($darkTheme ? '-dark' : '') . '.' . $ext;
+			} else {
+				$path = 'avatar' . ($darkTheme ? '-dark' : '') . '.'  . $size . '.' . $ext;
+			}
 		} else {
-			$path = 'avatar.' . $size . '.' . $ext;
+			if ($size === -1) {
+				$path = 'avatar.' . $ext;
+			} else {
+				$path = 'avatar.' . $size . '.' . $ext;
+			}
 		}
 
 		try {
@@ -255,11 +273,9 @@ class UserAvatar extends Avatar {
 			if ($size <= 0) {
 				throw new NotFoundException;
 			}
-
-			// TODO: rework to integrate with the PlaceholderAvatar in a compatible way
-			if ($this->folder->fileExists('generated')) {
-				if (!$data = $this->generateAvatarFromSvg($size)) {
-					$data = $this->generateAvatar($this->getDisplayName(), $size);
+			if ($generated) {
+				if (!$data = $this->generateAvatarFromSvg($size, $darkTheme)) {
+					$data = $this->generateAvatar($this->getDisplayName(), $size, $darkTheme);
 				}
 			} else {
 				$avatar = new \OCP\Image();
@@ -279,7 +295,7 @@ class UserAvatar extends Avatar {
 		}
 
 		if ($this->config->getUserValue($this->user->getUID(), 'avatar', 'generated', null) === null) {
-			$generated = $this->folder->fileExists('generated') ? 'true' : 'false';
+			$generated = $generated ? 'true' : 'false';
 			$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', $generated);
 		}
 
diff --git a/lib/public/Color.php b/lib/public/Color.php
index e2cabd9c2fc..6c9a35ca49c 100644
--- a/lib/public/Color.php
+++ b/lib/public/Color.php
@@ -125,6 +125,14 @@ class Color {
 		return $palette;
 	}
 
+	public function alphaBlending(float $opacity, Color $source): Color {
+		return new Color(
+			(int)((1 - $opacity) * $source->red() + $opacity * $this->red()),
+			(int)((1 - $opacity) * $source->green() + $opacity * $this->green()),
+			(int)((1 - $opacity) * $source->blue() + $opacity * $this->blue())
+		);
+	}
+
 	/**
 	 * Calculate steps between two Colors
 	 * @param int $steps start color
diff --git a/lib/public/IAvatar.php b/lib/public/IAvatar.php
index d05a12e1dbf..f9fe9a645e6 100644
--- a/lib/public/IAvatar.php
+++ b/lib/public/IAvatar.php
@@ -39,10 +39,11 @@ interface IAvatar {
 	 * Get the users avatar
 	 *
 	 * @param int $size size in px of the avatar, avatars are square, defaults to 64, -1 can be used to not scale the image
+	 * @param bool $darkTheme Should the generated avatar be dark themed
 	 * @return false|\OCP\IImage containing the avatar or false if there's no image
 	 * @since 6.0.0 - size of -1 was added in 9.0.0
 	 */
-	public function get(int $size = 64);
+	public function get(int $size = 64, bool $darkTheme = false);
 
 	/**
 	 * Check if an avatar exists for the user
@@ -81,10 +82,11 @@ interface IAvatar {
 	 * Get the file of the avatar
 	 *
 	 * @param int $size The desired image size. -1 can be used to not scale the image
+	 * @param bool $darkTheme Should the generated avatar be dark themed
 	 * @throws NotFoundException
 	 * @since 9.0.0
 	 */
-	public function getFile(int $size): ISimpleFile;
+	public function getFile(int $size, bool $darkTheme = false): ISimpleFile;
 
 	/**
 	 * Get the avatar background color