CURA-12544 saving and loading painted files in cura

.clang-format

@@ -38,7 +38,7 @@ BreakBeforeBraces: Allman
 BreakBeforeTernaryOperators: true
 BreakConstructorInitializers: BeforeComma
 BreakStringLiterals: true
-ColumnLimit: 240
+ColumnLimit: 180
 CommentPragmas: '^ IWYU pragma:'
 CompactNamespaces: false
 PackConstructorInitializers: CurrentLine

CMakeLists.txt

@@ -13,31 +13,34 @@ set(savitar_SRCS
         src/MeshData.cpp
         src/Vertex.cpp
         src/Face.cpp
-        )
+        src/UVCoordinate.cpp
+        src/UVCoordinatesIndices.cpp
+        src/TextureData.cpp
+)
 
-if(BUILD_SHARED_LIBS)
+if (BUILD_SHARED_LIBS)
     add_library(Savitar SHARED ${savitar_SRCS})
-    if(WIN32)
+    if (WIN32)
         set_target_properties(Savitar PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS ON)
-    endif()
-else()
+    endif ()
+else ()
     add_library(Savitar STATIC ${savitar_SRCS})
-endif()
+endif ()
 
 set_project_warnings(Savitar)
 
 target_link_libraries(Savitar PUBLIC pugixml::pugixml)
 
 target_include_directories(Savitar
         PUBLIC
-            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
         PRIVATE
-            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
-        )
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+)
 
 option(ENABLE_TESTING "Enable unit-testing" OFF)
 if (ENABLE_TESTING)
     enable_testing()
     add_subdirectory(tests)
-endif()
+endif ()

include/Savitar/Face.h

@@ -4,25 +4,38 @@
 #ifndef FACE_H
 #define FACE_H
 
+#include "Savitar/UVCoordinatesIndices.h"
+
+#include <optional>
+
 namespace Savitar
 {
 class Face
 {
 public:
     /**
-     * A face uses the index of 3 vertices to describe a triangle
+     * A face uses the index of 3 vertices to describe a triangle, and possibly indices of UV coordinates
      */
-    Face(int v1, int v2, int v3);
+    Face(int v1, int v2, int v3, const std::optional<UVCoordinatesIndices>& uv_coordinates = std::nullopt);
     ~Face() = default;
 
     [[nodiscard]] int getV1() const;
+    void setV1(const int v1);
+
     [[nodiscard]] int getV2() const;
+    void setV2(const int v2);
+
     [[nodiscard]] int getV3() const;
+    void setV3(const int v3);
+
+    [[nodiscard]] const std::optional<UVCoordinatesIndices>& getUVCoordinates() const;
+    void setUVCoordinates(const std::optional<UVCoordinatesIndices>& uv_coordinates);
 
 private:
     int vertex_1_index_;
     int vertex_2_index_;
     int vertex_3_index_;
+    std::optional<UVCoordinatesIndices> uv_coordinates_;
 };
 } // namespace Savitar
 

include/Savitar/MeshData.h

@@ -4,8 +4,6 @@
 #ifndef MESHDATA_H
 #define MESHDATA_H
 
-#include <cstdint>
-#include <string>
 #include <vector>
 
 #include "Savitar/Face.h"
@@ -16,6 +14,9 @@
 
 namespace Savitar
 {
+
+class Scene;
+
 class MeshData
 {
 public:
@@ -56,6 +57,28 @@ class MeshData
      */
     [[nodiscard]] bytearray getFlatVerticesAsBytes();
 
+    /**
+     * Retrieves the list of actual UV coordinates for each vertex of each face, as a raw byte array
+     * @param scene The scene which actually holds the UV coordinates set (can be shared amongst meshes)
+     * @return The coordinates array, or an empty array if the mesh doesn't have texture data
+     */
+    [[nodiscard]] bytearray getUVCoordinatesPerVertexAsBytes(const Scene* scene) const;
+
+    /**
+     * Sets the UV coordinates from a raw byte array, containing the actual coordinates for each vertex of each face
+     * @param data The raw coordinates data
+     * @param texture_path The path of the texture file te be stored besides the model description
+     * @param scene The scene which actually holds the UV coordinates set (can be shared amongst meshes)
+     */
+    void setUVCoordinatesPerVertexAsBytes(const bytearray& data, const std::string& texture_path, Scene* scene);
+
+    /**
+     * Get the path of the texture used by this mesh
+     * @param scene The scene which actually contains the list of stored textures (can be shared amongst models)
+     * @return The texture path, or an empty string if the mesh doesn't have texture data
+     */
+    [[nodiscard]] std::string getTexturePath(const Scene* scene) const;
+
     /**
      * Set the vertices of the meshdata by bytearray (as set from python)
      *
@@ -77,9 +100,19 @@ class MeshData
      */
     void clear();
 
+private:
+    /**
+     * @tparam T The type of data to be exported
+     * @param data The byte array containing the exported raw data
+     * @param value The value to be exported as raw data in the byte array
+     */
+    template<typename T>
+    static void exportToByteArray(bytearray& data, const T value);
+
 private:
     std::vector<Vertex> vertices_;
     std::vector<Face> faces_;
+    int uv_group_id_{ -1 };
 };
 } // namespace Savitar
 

include/Savitar/Scene.h

@@ -5,6 +5,7 @@
 #define SCENE_H
 
 #include "Savitar/SceneNode.h"
+#include "TextureData.h"
 
 #include <map> // For std::map
 #include <string> // For std::string
@@ -29,7 +30,7 @@ class Scene
      */
     [[nodiscard]] std::vector<SceneNode*> getSceneNodes();
 
-    [[nodiscard]] std::vector<SceneNode*> getAllSceneNodes();
+    [[nodiscard]] std::vector<SceneNode*> getAllSceneNodes() const;
 
     /**
      * Add a scene node to the scene.
@@ -42,6 +43,11 @@ class Scene
      */
     void fillByXMLNode(pugi::xml_node xml_node);
 
+    /**
+     * Serialise the scene to model_node
+     */
+    void toXmlNode(pugi::xml_node& model_node);
+
     /**
      * Store a metadata entry as metadata.
      * @param key The key of the metadata.
@@ -68,6 +74,12 @@ class Scene
      */
     [[nodiscard]] const std::map<std::string, MetadataEntry>& getMetadata() const;
 
+    /**
+     * Find the next available resource ID amongst actually stored texture, UV coordinates and scene nodes. This should be called before
+     * adding any of these resources, so that IDs are unique in the end.
+     */
+    [[nodiscard]] int getNextAvailableResourceId() const;
+
     /**
      * Get the unit (milimeter, inch, etc) of the scene.
      * This is in milimeter by default.
@@ -76,10 +88,25 @@ class Scene
 
     void setUnit(std::string unit);
 
+    [[nodiscard]] std::string getTexturePathFromGroupId(const int uv_group_id) const;
+
+    [[nodiscard]] const TextureData::UVCoordinatesGroup* getUVCoordinatesGroup(const int uv_group_id) const;
+
+    void addTexturePath(const std::string& texture_path, const int texture_id);
+
+    /**
+     * Stores a UV coordinates group from raw data
+     * @param data The raw data to be stored
+     * @param texture_id The ID of the associated texture
+     * @param group_id The ID of the newly created coordinates group
+     */
+    void setUVCoordinatesGroupFromBytes(const bytearray& data, const int texture_id, const int group_id);
+
 private:
     std::vector<SceneNode*> scene_nodes_;
     std::map<std::string, MetadataEntry> metadata_;
     std::string unit_{ "millimeter" };
+    TextureData texture_data_;
 
     /**
      * Used to recursively create SceneNode objects based on xml nodes.

include/Savitar/SceneNode.h

@@ -44,9 +44,9 @@ class SceneNode
     /**
      * Get the (unique) identifier of the node.
      */
-    [[nodiscard]] std::string getId();
+    [[nodiscard]] int getId() const;
 
-    void setId(std::string id);
+    void setId(int id);
 
     /**
      * Get the (non-unique) display name of the node.
@@ -81,7 +81,7 @@ class SceneNode
     std::vector<SceneNode*> children_;
     MeshData mesh_data_;
     std::map<std::string, MetadataEntry> settings_;
-    std::string id_;
+    int id_{ -1 };
     std::string name_;
     std::string type_{ "model" };
     std::string component_path_;

include/Savitar/TextureData.h

@@ -0,0 +1,64 @@
+// Copyright (c) 2025 Ultimaker B.V.
+// libSavitar is released under the terms of the LGPLv3 or higher.
+
+#ifndef TEXTUREDATA_H
+#define TEXTUREDATA_H
+
+#include "Types.h"
+#include "UVCoordinate.h"
+
+#include <map>
+#include <pugixml.hpp>
+#include <string>
+#include <vector>
+
+namespace Savitar
+{
+/**
+ * The TextureData stores UV coordinates groups and textures paths, that will end-up as resources in the global model description
+ */
+class TextureData
+{
+public:
+    struct UVCoordinatesGroup
+    {
+        int texture_id; // The ID of the associated texture
+        std::vector<UVCoordinate> coordinates; // The actual UV coordinates of the group
+    };
+
+    TextureData();
+    virtual ~TextureData() = default;
+
+    void fillByXMLNode(pugi::xml_node xml_node);
+
+    void toXmlNode(pugi::xml_node& resources_node);
+
+    [[nodiscard]] std::string getTexturePath(const int texture_id) const;
+
+    [[nodiscard]] const UVCoordinatesGroup* getUVCoordinatesGroup(const int id) const;
+
+    /**
+     * Loads a UV coordinates group from raw data
+     * @param data The actual UV coordinates as an array of floats
+     * @param texture_id The ID of the associated texture
+     * @param group_id The ID of the newly created group
+     */
+    void setUVCoordinatesGroupFromBytes(const bytearray& data, const int texture_id, const int group_id);
+
+    void addTexturePath(const std::string& texture_path, const int id);
+
+    [[nodiscard]] std::string getTexturePathFromGroupId(const int uv_group_id) const;
+
+    /**
+     * Find the next available resource ID amongst actually stored texture and UV coordinates. This should be called before
+     * adding any of these resources, so that IDs are unique in the end.
+     */
+    [[nodiscard]] int getNextAvailableResourceId() const;
+
+private:
+    std::map<int, std::string> textures_paths_;
+    std::map<int, UVCoordinatesGroup> uv_coordinates_;
+};
+} // namespace Savitar
+
+#endif

include/Savitar/UVCoordinate.h

@@ -0,0 +1,27 @@
+// Copyright (c) 2025 Ultimaker B.V.
+// libSavitar is released under the terms of the LGPLv3 or higher.
+
+#ifndef UVCOORDINATE_H
+#define UVCOORDINATE_H
+
+namespace Savitar
+{
+class UVCoordinate
+{
+public:
+    /**
+     * A UV coordinate represents the position of the point on a texture image.
+     */
+    UVCoordinate(float u, float v);
+    virtual ~UVCoordinate() = default;
+
+    [[nodiscard]] float getU() const;
+    [[nodiscard]] float getV() const;
+
+private:
+    float u_;
+    float v_;
+};
+} // namespace Savitar
+
+#endif

include/Savitar/UVCoordinatesIndices.h

@@ -0,0 +1,32 @@
+// Copyright (c) 2025 Ultimaker B.V.
+// libSavitar is released under the terms of the LGPLv3 or higher.
+
+#ifndef UVCOORDINATESINDICES_H
+#define UVCOORDINATESINDICES_H
+
+namespace Savitar
+{
+/**
+ * UV coordinates indices contains the UV group ID and associated indices for each point of a face. A single mesh may contain indices
+ * from multiple texture.
+ */
+class UVCoordinatesIndices
+{
+public:
+    UVCoordinatesIndices(int group_index, int vertex_1_index, int vertex_2_index, int vertex_3_index);
+    virtual ~UVCoordinatesIndices() = default;
+
+    [[nodiscard]] int getGroupIndex() const;
+    [[nodiscard]] int getV1() const;
+    [[nodiscard]] int getV2() const;
+    [[nodiscard]] int getV3() const;
+
+private:
+    int group_index_{};
+    int vertex_1_index_{};
+    int vertex_2_index_{};
+    int vertex_3_index_{};
+};
+} // namespace Savitar
+
+#endif