feat(Editor): glTFHandler 处理优化

packages/editor/src/plugin/glTFHandler/optimizePng.ts

@@ -0,0 +1,26 @@
+import type { Transform } from '@gltf-transform/core';
+import { encodePNG } from './util';
+
+function asUint8Array(data: unknown): Uint8Array {
+    if (data instanceof Uint8Array) return data;
+    if (data instanceof ArrayBuffer) return new Uint8Array(data);
+    throw new Error('Unsupported texture image type');
+}
+
+export const optimizePNG = (): Transform => async (doc) => {
+    const textures = doc.getRoot().listTextures();
+    for (const tex of textures) {
+        // 仅处理 PNG
+        if (tex.getMimeType() !== 'image/png') continue;
+
+        const image = tex.getImage();
+        if (!image || image.byteLength === 0) continue;
+
+        // 归一化为 Uint8Array
+        const imgU8 = asUint8Array(image);
+
+        const stamped = await encodePNG(imgU8);
+        tex.setImage(stamped);
+        tex.setMimeType('image/png');
+    }
+};