Extract draw merge plane dispatch helper

src/canvas.cpp

@@ -514,6 +514,16 @@ static void execute_canvas_draw_merge_plane_final_composite(
     bool draw_checkerboard,
     bool use_blend);
 
+static void execute_canvas_draw_merge_plane_dispatch(
+    Canvas& canvas,
+    int plane_index,
+    const std::vector<std::shared_ptr<Layer>>& layers,
+    const Brush& brush,
+    const glm::mat4& ortho,
+    bool use_blend,
+    bool copy_blend_destination,
+    bool draw_checkerboard);
+
 static pp::panopainter::LegacyCanvasDrawMergeLayerCompositeExecution make_canvas_draw_merge_branch_dispatch(
     Canvas& canvas,
     int plane_index,
@@ -733,6 +743,28 @@ static void execute_canvas_draw_merge_plane_iteration(
         if (!faces[plane_index])
             continue;
 
+        execute_canvas_draw_merge_plane_dispatch(
+            canvas,
+            plane_index,
+            layers,
+            brush,
+            ortho,
+            use_blend,
+            copy_blend_destination,
+            draw_checkerboard);
+    }
+}
+
+static void execute_canvas_draw_merge_plane_dispatch(
+    Canvas& canvas,
+    int plane_index,
+    const std::vector<std::shared_ptr<Layer>>& layers,
+    const Brush& brush,
+    const glm::mat4& ortho,
+    bool use_blend,
+    bool copy_blend_destination,
+    bool draw_checkerboard)
+{
     canvas.m_layers_merge.rtt(plane_index).bindFramebuffer();
     pp::panopainter::execute_legacy_canvas_draw_merge_plane_setup(
         pp::panopainter::LegacyCanvasDrawMergePlaneSetupUniforms {
@@ -774,7 +806,6 @@ static void execute_canvas_draw_merge_plane_iteration(
     execute_canvas_draw_merge_plane_final_composite(canvas, ortho, draw_checkerboard, use_blend);
     canvas.m_layers_merge.rtt(plane_index).unbindFramebuffer();
 }
-}
 
 static void execute_canvas_draw_merge_plane_final_composite(
     Canvas& canvas,