Maintain identity and cache styles based on surface-style-shading not styled-item #5486

cmake/CMakeLists.txt

@@ -27,6 +27,8 @@ if(CCACHE_FOUND)
     set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
 endif()
 
+add_definitions(-D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR)
+
 cmake_policy(SET CMP0048 NEW)
 cmake_policy(SET CMP0074 NEW)
 cmake_policy(SET CMP0078 NEW)

src/ifcgeom/mapping/mapping.cpp

@@ -430,10 +430,8 @@ namespace {
         }
 #endif
 
-        IfcSchema::IfcSurfaceStyle *surface_style = nullptr;
         for (auto& style : prs_styles) {
-            if (style->declaration().is(IfcSchema::IfcSurfaceStyle::Class())) {
-                surface_style = (IfcSchema::IfcSurfaceStyle*)style;
+            if (auto surface_style = style->as<IfcSchema::IfcSurfaceStyle>()) {
                 if (surface_style->Side() != IfcSchema::IfcSurfaceSide::IfcSurfaceSide_NEGATIVE) {
                     auto styles_elements = surface_style->Styles();
                     for (auto mt = styles_elements->begin(); mt != styles_elements->end(); ++mt) {
@@ -444,7 +442,7 @@ namespace {
                 }
             }
         }
-        return std::make_pair(surface_style, nullptr);
+        return std::make_pair(nullptr, nullptr);
     }
 
     bool process_colour(IfcSchema::IfcColourRgb* colour, double* rgb) {
@@ -546,6 +544,21 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcStyledItem* inst) {
         return nullptr;
     }
 
+    // map and not map_impl otherwise no caching
+    return map(style);
+}
+
+taxonomy::ptr mapping::map_impl(const IfcSchema::IfcSurfaceStyle* style) {
+    auto styles = style->Styles();
+    IfcSchema::IfcSurfaceStyleShading* shading = nullptr;
+    for (auto& s : *styles) {
+        if (shading = s->as<IfcSchema::IfcSurfaceStyleShading>()) {
+            break;
+        }
+    }
+    if (shading == nullptr) {
+        return nullptr;
+    }
     taxonomy::style::ptr surface_style = taxonomy::make<taxonomy::style>();
     surface_style->instance = style;
     if (settings_.get<settings::UseMaterialNames>().get() && style->Name()) {
@@ -611,7 +624,6 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcStyledItem* inst) {
     return surface_style;
 }
 
-
 taxonomy::ptr mapping::map(const IfcBaseInterface* inst) {
     auto iden = inst->as<IfcUtil::IfcBaseClass>()->identity();
     if (use_caching_) {

src/ifcgeom/mapping/mapping.i

@@ -171,6 +171,7 @@ BIND(IfcVector);
 // BIND(IfcColourRgb);
 BIND(IfcMaterial); // -> style
 BIND(IfcStyledItem); // -> style
+BIND(IfcSurfaceStyle); // -> style
 
 #ifdef SCHEMA_HAS_IfcCurveSegment
 BIND(IfcCurveSegment);