Remove Unused Project Includes and Forward-Declare Where a Type Is Only Referenced

Generated with include-what-you-use and applied conservatively. Only OrcaSlicer's own headers, the ones under src/ and tests/, are removed or forward-declared; standard-library and third-party includes are left alone. An include is removed only when both the Release and the Debug configuration leave it unused, never from inside a conditional block, and never from a file with platform-specific blocks, which only gain includes. Files whose only use of a header sits behind a feature or debug macro (libvgcode's OpenGL ES and marker code, the ARACHNE/TESTS_EXPORT_SVGS debug output) keep their includes.

clonable_ptr.hpp gains #pragma once; it had no include guard and was only safe while Config.hpp was its sole includer.

tests/sla_print/sla_print_tests.cpp

@@ -27,8 +27,9 @@
 
 #include <libslic3r/TriangleMeshSlicer.hpp>
 #include <libslic3r/SLA/SupportTreeMesher.hpp>
-#include <libslic3r/SLA/Concurrency.hpp>
 #include <vector>
+#include "libslic3r/BoundingBox.hpp"
+#include "libslic3r/ExtrusionEntity.hpp"
 
 namespace {
 

tests/sla_print/sla_print_tests_main.cpp

@@ -1,4 +1,3 @@
-#include "libslic3r/libslic3r.h"
 #define NANOSVG_IMPLEMENTATION
 #include "nanosvg/nanosvg.h"
 #define NANOSVGRAST_IMPLEMENTATION

tests/sla_print/sla_raycast_tests.cpp

@@ -2,16 +2,13 @@
 #include <catch2/catch_all.hpp>
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/catch_approx.hpp>
-#include "test_utils.hpp"
 
 #include "libslic3r/Point.hpp"
 #include <cstdlib>
 #include <cmath>
-#include <libslic3r/SLA/IndexedMesh.hpp>
 #include <libslic3r/SLA/Hollowing.hpp>
 #include <utility>
 
-#include "sla_test_utils.hpp"
 
 using namespace Slic3r;
 

tests/sla_print/sla_supptgen_tests.cpp

@@ -5,7 +5,6 @@
 
 #include <cstddef>
 #include <iterator>
-#include <libslic3r/ExPolygon.hpp>
 #include <libslic3r/BoundingBox.hpp>
 #include "libslic3r/TriangleMesh.hpp"
 #include "libslic3r/libslic3r.h"

tests/sla_print/sla_test_utils.cpp

@@ -34,6 +34,7 @@
 #include "libslic3r/SLA/ConcaveHull.hpp"
 #include "libslic3r/SLA/RasterBase.hpp"
 #include "libslic3r/BoundingBox.hpp"
+#include "libslic3r/Line.hpp"
 
 void test_support_model_collision(const std::string          &obj_filename,
                                   const sla::SupportTreeConfig   &input_supportcfg,

tests/sla_print/sla_test_utils.hpp

@@ -3,7 +3,6 @@
 
 #include <catch2/catch_all.hpp>
 #include <catch2/catch_test_macros.hpp>
-#include "test_utils.hpp"
 
 // Debug
 #include <cstddef>
@@ -12,7 +11,6 @@
 #include <cstdint>
 #include <fstream>
 #include <string>
-#include "libslic3r/SLA/SupportTree.hpp"
 #include "libslic3r/SLA/Hollowing.hpp"
 #include <unordered_map>
 #include <random>
@@ -23,20 +21,17 @@
 #include <vector>
 #include <utility>
 
-#include "libslic3r/libslic3r.h"
-#include "libslic3r/Format/OBJ.hpp"
-#include "libslic3r/SLAPrint.hpp"
 #include "libslic3r/TriangleMesh.hpp"
-#include "libslic3r/SLA/Pad.hpp"
 #include "libslic3r/SLA/SupportTreeBuilder.hpp"
 #include "libslic3r/SLA/SupportTreeBuildsteps.hpp"
 #include "libslic3r/SLA/SupportPointGenerator.hpp"
-#include "libslic3r/SLA/AGGRaster.hpp"
-#include "libslic3r/SLA/ConcaveHull.hpp"
-#include "libslic3r/MTUtils.hpp"
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/ExtrusionEntity.hpp"
+
+namespace Slic3r::sla { class RasterGrayscaleAA; }
+namespace Slic3r::sla { struct PadConfig; }
+namespace Slic3r::sla { struct SupportTreeConfig; }
 
-#include "libslic3r/SVG.hpp"
-#include "libslic3r/Format/OBJ.hpp"
 
 using namespace Slic3r;