Route stroke face sample ordering through helper

src/legacy_canvas_stroke_execution_services.h

@@ -192,6 +192,32 @@ std::size_t execute_legacy_canvas_stroke_frame_faces(
     return executed_faces;
 }
 
+template <typename Frames, typename BeginFrame, typename BeginFace, typename ExecuteSample, typename FinishFace>
+std::size_t execute_legacy_canvas_stroke_frame_samples(
+    Frames&& frames,
+    BeginFrame&& begin_frame,
+    BeginFace&& begin_face,
+    ExecuteSample&& execute_sample,
+    FinishFace&& finish_face)
+{
+    std::size_t executed_faces = 0;
+    for (auto& frame : frames) {
+        begin_frame(frame);
+        for (int face_index = 0; face_index < 6; ++face_index) {
+            auto& vertices = frame.shapes[face_index];
+            if (vertices.size() < 3) {
+                continue;
+            }
+
+            begin_face(frame, face_index, vertices);
+            auto sample_dirty_box = execute_sample(frame, face_index, vertices);
+            finish_face(frame, face_index, sample_dirty_box);
+            ++executed_faces;
+        }
+    }
+    return executed_faces;
+}
+
 [[nodiscard]] inline pp::paint_renderer::CanvasStrokeBox legacy_canvas_stroke_box(glm::vec4 box) noexcept
 {
     return pp::paint_renderer::CanvasStrokeBox {