Move NodeCanvas display resolve behind seam

src/legacy_canvas_draw_merge_services.h

@@ -175,6 +175,20 @@ struct LegacyCanvasDrawMergeFinalPlaneCompositeExecution {
     std::function<void()> unbind_merged_texture;
 };
 
+struct LegacyCanvasDrawMergeDisplayResolveUniforms {
+    LegacyCanvasDrawMergeTextureUniforms texture;
+};
+
+struct LegacyCanvasDrawMergeDisplayResolveExecution {
+    std::function<void()> unbind_resolve_framebuffer;
+    std::function<void()> clear_color_buffer;
+    std::function<void()> apply_viewport;
+    std::function<void()> bind_sampler;
+    std::function<void()> bind_resolve_texture;
+    std::function<void()> draw;
+    std::function<void()> unbind_resolve_texture;
+};
+
 [[nodiscard]] inline LegacyCanvasDrawMergeShaderExecution legacy_shader_manager_draw_merge_execution() noexcept
 {
     return {
@@ -433,4 +447,18 @@ inline void execute_legacy_canvas_draw_merge_final_plane_composite(
     execution.unbind_merged_texture();
 }
 
+inline void execute_legacy_canvas_draw_merge_display_resolve(
+    const LegacyCanvasDrawMergeDisplayResolveUniforms& uniforms,
+    const LegacyCanvasDrawMergeDisplayResolveExecution& execution)
+{
+    execution.unbind_resolve_framebuffer();
+    execution.clear_color_buffer();
+    execution.apply_viewport();
+    execution.bind_sampler();
+    execution.bind_resolve_texture();
+    setup_legacy_canvas_draw_merge_texture_shader(uniforms.texture);
+    execution.draw();
+    execution.unbind_resolve_texture();
+}
+
 } // namespace pp::panopainter