fix: use RIFF sprite bounds for tank icon extraction

packages/scripts/src/buildAssets/tankIcons.ts

@@ -1,6 +1,7 @@
 import { NATION_IDS } from "@blitzkit/core";
 import sharp from "sharp";
 import type { Vector3Tuple } from "three";
+import { parsePackedSpriteRect } from "../core/blitz/parsePackedSpriteRect";
 import { AssetUploader } from "../core/github/assetUploader";
 import { vfs } from "./constants";
 import type { VehicleDefinitionList } from "./definitions";
@@ -37,6 +38,45 @@ export interface TankParameters {
   };
 }
 
+async function extractPackedTankIcon(packedBuffer: Buffer, context: string) {
+  const texture = sharp(packedBuffer);
+  const spriteRect = parsePackedSpriteRect(packedBuffer);
+
+  if (!spriteRect) {
+    throw new Error(`Missing RIFF sprite bounds for ${context}`);
+  }
+
+  const [left, top, width, height] = spriteRect;
+  const bounds = [left, top, width, height];
+
+  if (!bounds.every(Number.isInteger)) {
+    throw new Error(
+      `Invalid RIFF sprite bounds for ${context}: ${bounds.join(" ")}`,
+    );
+  }
+
+  const metadata = await texture.metadata();
+
+  if (metadata.width === undefined || metadata.height === undefined) {
+    throw new Error(`Failed to read image dimensions for ${context}`);
+  }
+
+  if (
+    left < 0 ||
+    top < 0 ||
+    width <= 0 ||
+    height <= 0 ||
+    left + width > metadata.width ||
+    top + height > metadata.height
+  ) {
+    throw new Error(
+      `Out-of-bounds RIFF sprite for ${context}: ${bounds.join(" ")} in ${metadata.width}x${metadata.height}`,
+    );
+  }
+
+  return await texture.extract({ left, top, width, height }).toBuffer();
+}
+
 export async function tankIcons() {
   console.log("Building tank icons...");
 
@@ -67,12 +107,14 @@ export async function tankIcons() {
       const bigPath = `Data/${parameters.resourcesPath.bigIconPath
         .replace(/~res:\//, "")
         .replace(/\..+/, "")}.packed.webp`;
-      const big = await sharp(await vfs.file(bigPath))
-        .trim()
-        .toBuffer();
-      const small = await sharp(await vfs.file(smallPath))
-        .trim()
-        .toBuffer();
+      const big = await extractPackedTankIcon(
+        await vfs.file(bigPath),
+        `tank ${tankKey} big`,
+      );
+      const small = await extractPackedTankIcon(
+        await vfs.file(smallPath),
+        `tank ${tankKey} small`,
+      );
 
       if (big) {
         await uploader.add({