Merge pull request mozilla#18580 from calixteman/alt_text_pass_buffer

[Editor] Pass a buffer instead of a typed array when passing image data to the model

src/display/editor/stamp.js

@@ -169,7 +169,9 @@ class StampEditor extends AnnotationEditor {
     const response = await mlManager.guess({
       name: "altText",
       request: {
-        data,
+        // Pass a buffer to avoid copy, see "run" method in:
+        //  https://searchfox.org/mozilla-central/source/toolkit/components/ml/actors/MLEngineParent.sys.mjs
+        data: data.buffer,
         width,
         height,
         channels: data.length / (width * height),