From b333b06772c89d96aacb5490d6a219fba7c09cc6 Mon Sep 17 00:00:00 2001
From: Mitja Felicijan <mitja.felicijan@gmail.com>
Date: Thu, 12 Feb 2026 20:57:17 +0100
Subject: Engage!

---
 .../server/webui/src/lib/utils/webp-to-png.ts      | 73 ++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 llama.cpp/tools/server/webui/src/lib/utils/webp-to-png.ts

(limited to 'llama.cpp/tools/server/webui/src/lib/utils/webp-to-png.ts')

diff --git a/llama.cpp/tools/server/webui/src/lib/utils/webp-to-png.ts b/llama.cpp/tools/server/webui/src/lib/utils/webp-to-png.ts
new file mode 100644
index 0000000..ea51838
--- /dev/null
+++ b/llama.cpp/tools/server/webui/src/lib/utils/webp-to-png.ts
@@ -0,0 +1,73 @@
+import { FileExtensionImage, MimeTypeImage } from '$lib/enums';
+
+/**
+ * Convert a WebP base64 data URL to a PNG data URL
+ * @param base64UrlWebp - The WebP base64 data URL to convert
+ * @param backgroundColor - Background color for the PNG (default: 'white')
+ * @returns Promise resolving to PNG data URL
+ */
+export function webpBase64UrlToPngDataURL(
+	base64UrlWebp: string,
+	backgroundColor: string = 'white'
+): Promise<string> {
+	return new Promise((resolve, reject) => {
+		try {
+			const img = new Image();
+
+			img.onload = () => {
+				const canvas = document.createElement('canvas');
+				const ctx = canvas.getContext('2d');
+
+				if (!ctx) {
+					reject(new Error('Failed to get 2D canvas context.'));
+					return;
+				}
+
+				const targetWidth = img.naturalWidth || 300;
+				const targetHeight = img.naturalHeight || 300;
+
+				canvas.width = targetWidth;
+				canvas.height = targetHeight;
+
+				if (backgroundColor) {
+					ctx.fillStyle = backgroundColor;
+					ctx.fillRect(0, 0, canvas.width, canvas.height);
+				}
+				ctx.drawImage(img, 0, 0, targetWidth, targetHeight);
+
+				resolve(canvas.toDataURL(MimeTypeImage.PNG));
+			};
+
+			img.onerror = () => {
+				reject(new Error('Failed to load WebP image. Ensure the WebP data is valid.'));
+			};
+
+			img.src = base64UrlWebp;
+		} catch (error) {
+			const message = error instanceof Error ? error.message : String(error);
+			const errorMessage = `Error converting WebP to PNG: ${message}`;
+			console.error(errorMessage, error);
+			reject(new Error(errorMessage));
+		}
+	});
+}
+
+/**
+ * Check if a file is a WebP based on its MIME type
+ * @param file - The file to check
+ * @returns True if the file is a WebP
+ */
+export function isWebpFile(file: File): boolean {
+	return (
+		file.type === MimeTypeImage.WEBP || file.name.toLowerCase().endsWith(FileExtensionImage.WEBP)
+	);
+}
+
+/**
+ * Check if a MIME type represents a WebP
+ * @param mimeType - The MIME type to check
+ * @returns True if the MIME type is image/webp
+ */
+export function isWebpMimeType(mimeType: string): boolean {
+	return mimeType === MimeTypeImage.WEBP;
+}
-- 
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