Clean retained stroke extraction build

src/legacy_canvas_stroke_execution_services.h

@@ -17,6 +17,8 @@
 
 namespace pp::panopainter {
 
+void setup_legacy_stroke_dual_shader(bool uses_pattern);
+
 struct LegacyStrokeSampleExecutionRequest {
     std::string_view context;
     glm::vec2 target_size {};
@@ -192,6 +194,24 @@ struct LegacyCanvasStrokeMainPassExecutionRequest {
     std::function<void()> unbind_samplers;
 };
 
+[[nodiscard]] inline LegacyCanvasStrokeMainPassExecutionRequest make_legacy_canvas_stroke_main_pass_execution_request(
+    std::string_view context,
+    std::function<void()> bind_samplers,
+    std::function<void()> bind_textures,
+    std::function<void()> execute_frame_pass,
+    std::function<void()> unbind_textures,
+    std::function<void()> unbind_samplers)
+{
+    return LegacyCanvasStrokeMainPassExecutionRequest {
+        .context = context,
+        .bind_samplers = std::move(bind_samplers),
+        .bind_textures = std::move(bind_textures),
+        .execute_frame_pass = std::move(execute_frame_pass),
+        .unbind_textures = std::move(unbind_textures),
+        .unbind_samplers = std::move(unbind_samplers),
+    };
+}
+
 [[nodiscard]] inline LegacyCanvasStrokeSamplerDispatch make_legacy_canvas_stroke_live_pass_sampler_dispatch(
     std::function<void(int)> bind_brush_tip_sampler,
     std::function<void()> unbind_brush_tip_sampler,