Wrap stroke mix shell bundle

src/legacy_canvas_stroke_execution_services.h

@@ -387,6 +387,50 @@ struct LegacyCanvasStrokeMixPassSetup {
     };
 }
 
+struct LegacyCanvasStrokeMixPassShell {
+    LegacyCanvasStrokeMixPassSetup setup;
+    LegacyCanvasStrokeMixPassRequest request;
+};
+
+template <typename BeginMixPass, typename EndMixPass>
+[[nodiscard]] inline LegacyCanvasStrokeMixPassShell make_legacy_canvas_stroke_mix_pass_shell(
+    BeginMixPass&& begin_mix_pass,
+    EndMixPass&& end_mix_pass,
+    std::string_view context,
+    glm::vec2 resolution,
+    std::span<const LegacyCanvasStrokeMixPassPlane> planes,
+    std::function<void()> bind_mix_samplers,
+    std::function<void()> unbind_mix_samplers,
+    std::function<void(int, const glm::mat4&)> setup_plane_shader,
+    std::function<void(int)> bind_layer_texture,
+    std::function<void(int)> bind_stroke_texture,
+    std::function<void(int)> bind_mask_texture,
+    std::function<void()> draw_plane,
+    std::function<void(int)> unbind_mask_texture,
+    std::function<void(int)> unbind_stroke_texture,
+    std::function<void(int)> unbind_layer_texture)
+{
+    return LegacyCanvasStrokeMixPassShell {
+        .setup = make_legacy_canvas_stroke_mix_pass_setup(
+            std::forward<BeginMixPass>(begin_mix_pass),
+            std::forward<EndMixPass>(end_mix_pass)),
+        .request = make_legacy_canvas_stroke_mix_pass_request(
+            context,
+            resolution,
+            planes,
+            std::move(bind_mix_samplers),
+            std::move(unbind_mix_samplers),
+            std::move(setup_plane_shader),
+            std::move(bind_layer_texture),
+            std::move(bind_stroke_texture),
+            std::move(bind_mask_texture),
+            std::move(draw_plane),
+            std::move(unbind_mask_texture),
+            std::move(unbind_stroke_texture),
+            std::move(unbind_layer_texture)),
+    };
+}
+
 struct LegacyCanvasStrokeDualPassRequest {
     std::string_view context;
     std::function<void()> bind_brush_tip;