new stuff

vendor/assimp/code/AssetLib/DXF/DXFHelper.h

@@ -0,0 +1,207 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  DXFHelper.h
+ *  @brief Internal utilities for the DXF loader.
+ */
+
+#ifndef INCLUDED_DXFHELPER_H
+#define INCLUDED_DXFHELPER_H
+
+#include <assimp/LineSplitter.h>
+#include <assimp/TinyFormatter.h>
+#include <assimp/StreamReader.h>
+#include <assimp/fast_atof.h>
+#include <vector>
+#include <assimp/DefaultLogger.hpp>
+
+namespace Assimp::DXF {
+
+// read pairs of lines, parse group code and value and provide utilities
+// to convert the data to the target data type.
+// do NOT skip empty lines. In DXF files, they count as valid data.
+class LineReader {
+public:
+    explicit LineReader(StreamReaderLE& reader) : splitter(reader,false,true), groupcode( 0 ), end() {
+        // empty
+    }
+
+    // -----------------------------------------
+    bool Is(int gc, const char* what) const {
+        return groupcode == gc && !strcmp(what,value.c_str());
+    }
+
+    // -----------------------------------------
+    bool Is(int gc) const {
+        return groupcode == gc;
+    }
+
+    // -----------------------------------------
+    int GroupCode() const {
+        return groupcode;
+    }
+
+    // -----------------------------------------
+    const std::string& Value() const {
+        return value;
+    }
+
+    // -----------------------------------------
+    bool End() const {
+        return !((bool)*this);
+    }
+
+    // -----------------------------------------
+    unsigned int ValueAsUnsignedInt() const {
+        return strtoul10(value.c_str());
+    }
+
+    // -----------------------------------------
+    int ValueAsSignedInt() const {
+        return strtol10(value.c_str());
+    }
+
+    // -----------------------------------------
+    ai_real ValueAsFloat() const {
+        return fast_atof(value.c_str());
+    }
+
+    // -----------------------------------------
+    /** pseudo-iterator increment to advance to the next (groupcode/value) pair */
+    LineReader& operator++() {
+        if (end) {
+            if (end == 1) {
+                ++end;
+            }
+            return *this;
+        }
+
+        try {
+            groupcode = strtol10(splitter->c_str());
+            splitter++;
+
+            value = *splitter;
+            splitter++;
+
+            // automatically skip over {} meta blocks (these are for application use
+            // and currently not relevant for Assimp).
+            if (value.length() && value[0] == '{') {
+
+                size_t cnt = 0;
+                for(;splitter->length() && splitter->at(0) != '}'; splitter++, cnt++);
+
+                splitter++;
+                ASSIMP_LOG_VERBOSE_DEBUG("DXF: skipped over control group (",cnt," lines)");
+            }
+        } catch(std::logic_error&) {
+            ai_assert(!splitter);
+        }
+        if (!splitter) {
+            end = 1;
+        }
+        return *this;
+    }
+
+    // -----------------------------------------
+    LineReader& operator++(int) {
+        return ++(*this);
+    }
+
+
+    // -----------------------------------------
+    operator bool() const {
+        return end <= 1;
+    }
+
+private:
+    LineSplitter splitter;
+    int groupcode;
+    std::string value;
+    int end;
+};
+
+// represents a POLYLINE or a LWPOLYLINE. or even a 3DFACE The data is converted as needed.
+struct PolyLine {
+    PolyLine() : flags() {
+        // empty
+    }
+
+    std::vector<aiVector3D> positions;
+    std::vector<aiColor4D>  colors;
+    std::vector<unsigned int> indices;
+    std::vector<unsigned int> counts;
+    unsigned int flags;
+
+    std::string layer;
+    std::string desc;
+};
+
+// reference to a BLOCK. Specifies its own coordinate system.
+struct InsertBlock {
+    InsertBlock() : pos(0.f, 0.f, 0.f), scale(1.f,1.f,1.f), angle(0.0f) {
+        // empty
+    }
+
+    aiVector3D pos;
+    aiVector3D scale;
+    float angle;
+
+    std::string name;
+};
+
+
+// keeps track of all geometry in a single BLOCK.
+struct Block {
+    std::vector< std::shared_ptr<PolyLine> > lines;
+    std::vector<InsertBlock> insertions;
+
+    std::string name;
+    aiVector3D base;
+};
+
+struct FileData {
+    // note: the LAST block always contains the stuff from ENTITIES.
+    std::vector<Block> blocks;
+};
+
+} // namespace Assimp::DXF
+
+#endif // INCLUDED_DXFHELPER_H

vendor/assimp/code/AssetLib/DXF/DXFLoader.h

@@ -0,0 +1,146 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  DXFLoader.h
+ *  @brief Declaration of the .dxf importer class.
+ */
+#pragma once
+#ifndef AI_DXFLOADER_H_INCLUDED
+#define AI_DXFLOADER_H_INCLUDED
+
+#include <assimp/BaseImporter.h>
+#include <map>
+
+namespace Assimp {
+
+// Forward declarations
+namespace DXF {
+    class LineReader;
+    struct FileData;
+    struct PolyLine;
+    struct Block;
+    struct InsertBlock;
+
+    using BlockMap = std::map<std::string, const DXF::Block*>;
+}
+
+// ---------------------------------------------------------------------------
+/**
+ *  @brief  DXF importer implementation.
+ */
+class DXFImporter final : public BaseImporter {
+public:
+    DXFImporter() = default;
+    ~DXFImporter() override = default;
+
+    // -------------------------------------------------------------------
+    /** Returns whether the class can handle the format of the given file.
+    * See BaseImporter::CanRead() for details.  */
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const override;
+
+protected:
+    // -------------------------------------------------------------------
+    /** Return importer meta information.
+     * See #BaseImporter::GetInfo for the details*/
+    const aiImporterDesc* GetInfo () const override;
+
+    // -------------------------------------------------------------------
+    /** Imports the given file into the given scene structure.
+     * See BaseImporter::InternReadFile() for details */
+    void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler) override;
+
+private:
+    // -----------------------------------------------------
+    void SkipSection(DXF::LineReader& reader);
+
+    // -----------------------------------------------------
+    void ParseHeader(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseEntities(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseBlocks(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseBlock(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseInsertion(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParsePolyLine(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParsePolyLineVertex(DXF::LineReader& reader,
+        DXF::PolyLine& line);
+
+    // -----------------------------------------------------
+    void Parse3DFace(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ConvertMeshes(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void GenerateHierarchy(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void GenerateMaterials(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ExpandBlockReferences(DXF::Block& bl,
+        const DXF::BlockMap& blocks_by_name);
+};
+
+} // end of namespace Assimp
+
+#endif // AI_3DSIMPORTER_H_INC