refactor: extract image-helpers (#2261)

packages/lib/utils/images/avatar.ts

@@ -0,0 +1,16 @@
+import sharp from 'sharp';
+
+export const optimiseAvatar = async (bytes: string) => {
+  return await sharp(Buffer.from(bytes, 'base64'))
+    .resize(512, 512)
+    .toFormat('jpeg', { quality: 75 })
+    .toBuffer();
+};
+
+export const loadAvatar = async (bytes: string) => {
+  const content = await sharp(Buffer.from(bytes, 'base64')).toFormat('jpeg').toBuffer();
+  return {
+    contentType: 'image/jpeg',
+    content,
+  };
+};

packages/lib/utils/images/logo.ts

@@ -0,0 +1,10 @@
+import sharp from 'sharp';
+
+export const loadLogo = async (file: Uint8Array) => {
+  const content = await sharp(file).toFormat('png', { quality: 80 }).toBuffer();
+
+  return {
+    contentType: 'image/png',
+    content,
+  };
+};

packages/lib/utils/images/resize-image-to-gemini-image.ts

@@ -0,0 +1,19 @@
+import sharp from 'sharp';
+
+export const TARGET_SIZE = 1000;
+
+type ResizeImageToGeminiImageOptions = {
+  image: Buffer;
+  size?: number;
+};
+
+/**
+ * Resize image to 1000x1000 using fill strategy.
+ * Scales to cover the target area and crops any overflow.
+ */
+export const resizeImageToGeminiImage = async ({
+  image,
+  size = TARGET_SIZE,
+}: ResizeImageToGeminiImageOptions) => {
+  return await sharp(image).resize(size, size, { fit: 'fill' }).toBuffer();
+};

packages/lib/utils/images/svg-to-png.ts

@@ -0,0 +1,5 @@
+import sharp from 'sharp';
+
+export const svgToPng = async (svg: string) => {
+  return await sharp(Buffer.from(svg)).toFormat('png').toBuffer();
+};