Share document export readiness reporting

src/paint_renderer/compositor.cpp

@@ -481,6 +481,29 @@ pp::foundation::Result<DocumentFrameFacePngExportResult> export_document_frame_f
     return pp::foundation::Result<DocumentFrameFacePngExportResult>::success(std::move(result));
 }
 
+pp::foundation::Result<DocumentFrameExportReadinessResult> prepare_document_frame_export_readiness(
+    DocumentFrameCompositeRequest request)
+{
+    auto recorded_upload = record_document_frame_upload(DocumentFrameUploadRequest {
+        .document = request.document,
+        .frame_index = request.frame_index,
+        .clear_color = request.clear_color,
+    });
+    if (!recorded_upload) {
+        return pp::foundation::Result<DocumentFrameExportReadinessResult>::failure(recorded_upload.status());
+    }
+
+    auto face_pngs = export_document_frame_face_pngs(request);
+    if (!face_pngs) {
+        return pp::foundation::Result<DocumentFrameExportReadinessResult>::failure(face_pngs.status());
+    }
+
+    DocumentFrameExportReadinessResult result;
+    result.recorded_upload = std::move(recorded_upload.value());
+    result.face_pngs = std::move(face_pngs.value());
+    return pp::foundation::Result<DocumentFrameExportReadinessResult>::success(std::move(result));
+}
+
 bool stroke_composite_requires_feedback(
     pp::paint::BlendMode layer_blend_mode,
     pp::paint::StrokeBlendMode stroke_blend_mode,