True headless mode

CMakeLists.txt

@@ -164,8 +164,13 @@ endif()
 find_package(OpenCV REQUIRED)
 
 # Find Qt6
-find_package(Qt6 REQUIRED COMPONENTS Core Charts Gui Widgets OpenGL)
+find_package(Qt6 COMPONENTS Core Charts Gui Widgets OpenGL)
+if(Qt6_FOUND)
 qt_standard_project_setup()
+add_compile_definitions(BUILD_GUI)
+else()
+message(WARNING "Qt6 not found, disabling the GUI.")
+endif()
 
 message(STATUS "Found CMAKE_INSTALL_BINDIR: ${CMAKE_INSTALL_BINDIR}")
 message(STATUS "Found CMAKE_INSTALL_LIBDIR: ${CMAKE_INSTALL_LIBDIR}")
@@ -180,18 +185,22 @@ set(CMAKE_AUTOUIC ON)    # Enable automatic UIC
 
 # Add subdirectories for each project
 add_subdirectory(cvutil)
-add_subdirectory(PluginManager)
-add_subdirectory(RoiManager)
+if (Qt6_FOUND)
+  add_subdirectory(PluginManager)
+  add_subdirectory(RoiManager)
+endif()
 
 # Install OpenCV and Qt6 runtime shared libraries
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     foreach(opencv_lib ${OpenCV_LIBS})
         install(FILES $<TARGET_FILE:${opencv_lib}> CONFIGURATIONS Debug Release DESTINATION bin)
     endforeach()
 
-    foreach(qt_lib Qt6::Core Qt6::Widgets Qt6::Gui Qt6::Charts Qt6::OpenGL Qt6::OpenGLWidgets)
-        install(FILES $<TARGET_FILE:${qt_lib}> CONFIGURATIONS Debug Release DESTINATION bin)
-    endforeach()
+    if(Qt6_FOUND)
+        foreach(qt_lib Qt6::Core Qt6::Widgets Qt6::Gui Qt6::Charts Qt6::OpenGL Qt6::OpenGLWidgets)
+            install(FILES $<TARGET_FILE:${qt_lib}> CONFIGURATIONS Debug Release DESTINATION bin)
+        endforeach()
+    endif()
 
     if(MSVC)
         # Configurable path for MSVC LLVM bin directory
@@ -260,16 +269,16 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
         VERSION ${PROJECT_VERSION}
         SOVERSION ${PROJECT_VERSION_MAJOR}
     )
-
-    set_target_properties(PluginManager PROPERTIES
-        VERSION ${PROJECT_VERSION}
-        SOVERSION ${PROJECT_VERSION_MAJOR}
-    )
-
-    set_target_properties(RoiManager PROPERTIES
-        VERSION ${PROJECT_VERSION}
-        SOVERSION ${PROJECT_VERSION_MAJOR}
-    )
+    if (Qt6_FOUND)
+        set_target_properties(PluginManager PROPERTIES
+            VERSION ${PROJECT_VERSION}
+            SOVERSION ${PROJECT_VERSION_MAJOR}
+        )
+        set_target_properties(RoiManager PROPERTIES
+            VERSION ${PROJECT_VERSION}
+            SOVERSION ${PROJECT_VERSION_MAJOR}
+        )
+    endif()
 
     # foreach(opencv_lib ${OpenCV_LIBS})
     #     install(FILES $<TARGET_FILE:${opencv_lib}> CONFIGURATIONS Debug Release DESTINATION lib/cvutil COMPONENT runtime)
@@ -296,22 +305,24 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     endforeach()
 
     # Install PDB files for Qt6 libraries
-    foreach(qt_lib Qt6::Core Qt6::Widgets Qt6::Gui Qt6::Charts Qt6::OpenGL Qt6::OpenGLWidgets)
-        get_target_property(pdb_path ${qt_lib} IMPORTED_PDB_LOCATION_DEBUG)
-        if (NOT pdb_path)
-            get_target_property(pdb_path ${qt_lib} IMPORTED_LOCATION_DEBUG)
-            if(pdb_path)
-                string(REPLACE ".dll" ".pdb" pdb_path ${pdb_path})
+    if (Qt6_FOUND)
+        foreach(qt_lib Qt6::Core Qt6::Widgets Qt6::Gui Qt6::Charts Qt6::OpenGL Qt6::OpenGLWidgets)
+            get_target_property(pdb_path ${qt_lib} IMPORTED_PDB_LOCATION_DEBUG)
+            if (NOT pdb_path)
+                get_target_property(pdb_path ${qt_lib} IMPORTED_LOCATION_DEBUG)
+                if(pdb_path)
+                    string(REPLACE ".dll" ".pdb" pdb_path ${pdb_path})
+                endif()
             endif()
-        endif()
-        if(pdb_path AND EXISTS ${pdb_path})
-            install(FILES ${pdb_path} CONFIGURATIONS Debug DESTINATION bin)
-        endif()
-    endforeach()
+            if(pdb_path AND EXISTS ${pdb_path})
+                install(FILES ${pdb_path} CONFIGURATIONS Debug DESTINATION bin)
+            endif()
+        endforeach()
+    endif()
 endif()
 
 # Install Qt6 support plugins
-if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
+if (CMAKE_SYSTEM_NAME STREQUAL "Windows" AND Qt6_FOUND)
     foreach(qt_plugin Qt6::QWindowsIntegrationPlugin)
         install(FILES $<TARGET_FILE:${qt_plugin}> CONFIGURATIONS Debug Release DESTINATION bin/platforms)
         # Copy pdb files for the plugins

README.md

@@ -1,3 +1,11 @@
+# Information about this fork
+
+Modified source code to remove dependencies on Qt6.
+
+TODO:
+- Better replace QString
+- Port RoiManager (uses QtGraphicsRectItem for calculations)
+
 # Computer Vision UTILity toolkit (CVUTIL)
 
 cvutil is a C++ computer vision library that extends the functionality of OpenCV. The library contains some functions that are frequently used computer vision developers for convenience. The library uses multi-threading, vectorization routines available in Intel's AVX 2.0 to execute algorithms in the library. The optimizaion can be disabled optionally.

RoiManager/CMakeLists.txt

@@ -45,13 +45,18 @@ target_link_libraries(RoiManager
     PRIVATE
         cvutil_compiler_flags
         ${OpenCV_LIBS}
-        Qt6::Core
-        Qt6::Widgets
-        Qt6::Charts
-        Qt6::Gui
-        Qt6::OpenGL
 )
 
+if (Qt6_FOUND)
+    target_link_libraries(RoiManager
+        PRIVATE
+            Qt6::Core
+            Qt6::Widgets
+            Qt6::Charts
+            Qt6::Gui
+            Qt6::OpenGL
+    )
+
 # Link mimalloc for Release builds only
 if(USE_MIMALLOC)
     if(TARGET mimalloc)

RoiManager/include/RoiManager.h

@@ -33,7 +33,9 @@ along with cvutil; see the file COPYING.  If not, see
 
 // To disable warnings from external headers.
 #pragma warning(push, 0)
+#ifdef BUILD_GUI
 #include <QtWidgets/QtWidgets>
+#endif
 #include <opencv2/opencv.hpp>
 
 #include <iostream>

cvutil/CMakeLists.txt

@@ -14,19 +14,9 @@ set(SOURCES
     cvutil_bwskel.cpp
     cvutil_bwthin.cpp
     cvutil_core.cpp
-    cvutil_figure.cpp
     cvutil_linesim.cpp
     cvutil_videowriter.cpp
-    main.cpp
     cvutil_matlab_interface.cpp
-    MainWindow/BatchProcessor.cpp
-    MainWindow/FeatureExtractorThread.cpp
-    MainWindow/GraphicsScene.cpp
-    MainWindow/InteractiveExtractorThread.cpp
-    MainWindow/logger.cpp
-    MainWindow/MainWindow.cpp
-    MainWindow/helper_functions.cpp
-    MainWindow/MaterialStyle.cpp
     Profiler.cpp
     resources.qrc
 )
@@ -37,29 +27,49 @@ set(HEADERS
     cvutil_bwskel.h
     cvutil_bwthin.h
     cvutil_core.h
-    cvutil_figure.h
     cvutil_linesim.h
     cvutil_templates.h
     cvutil_matlab_interface.h
     cvutil_types.h
     cvutil_videowriter.h
-    demo.h
-    figure.h
-    main.h
-    MainWindow/BatchProcessor.h
-    MainWindow/FeatureExtractorThread.h
-    MainWindow/GraphicsScene.h
-    MainWindow/InteractiveExtractorThread.h
-    MainWindow/logger.h
-    MainWindow/MainWindow.h
-    MainWindow/helper_functions.h
-    MainWindow/MaterialStyle.h
     profiler.h
     resource.h
     stdproto.h
     video.h
 )
 
+if(Qt6_FOUND)
+    list(
+        APPEND SOURCES
+            main.cpp
+            cvutil_figure.cpp
+            MainWindow/BatchProcessor.cpp
+            MainWindow/FeatureExtractorThread.cpp
+            MainWindow/GraphicsScene.cpp
+            MainWindow/InteractiveExtractorThread.cpp
+            MainWindow/logger.cpp
+            MainWindow/MainWindow.cpp
+            MainWindow/helper_functions.cpp
+            MainWindow/MaterialStyle.cpp
+    )
+
+    list(
+        APPEND HEADERS
+          cvutil_figure.h
+          demo.h
+          figure.h
+          main.h
+          MainWindow/BatchProcessor.h
+          MainWindow/FeatureExtractorThread.h
+          MainWindow/GraphicsScene.h
+          MainWindow/InteractiveExtractorThread.h
+          MainWindow/logger.h
+          MainWindow/MainWindow.h
+          MainWindow/helper_functions.h
+          MainWindow/MaterialStyle.h
+      )
+endif()
+
 # Include the resource file only if it's WIN32 and MSVC
 if(WIN32)
     list(APPEND SOURCES cvutil.rc)
@@ -111,15 +121,21 @@ target_link_libraries(cvutil
     PRIVATE
         cvutil_compiler_flags
         ${OpenCV_LIBS}
-        Qt6::Core
-        Qt6::Widgets
-        Qt6::Charts
-        Qt6::Gui
-        Qt6::OpenGL
-        PluginManager  # These are handled at the solution level, no need to add subdirectories here
-        RoiManager
 )
 
+if(Qt6_FOUND)
+    target_link_libraries(cvutil
+        PRIVATE
+            Qt6::Core
+            Qt6::Widgets
+            Qt6::Charts
+            Qt6::Gui
+            Qt6::OpenGL
+            PluginManager  # These are handled at the solution level, no need to add subdirectories here
+            RoiManager
+    )
+endif()
+
 # Link mimalloc for Release builds only
 if(USE_MIMALLOC)
     if(TARGET mimalloc)

cvutil/cvutil.h

@@ -53,6 +53,8 @@ along with cvutil; see the file COPYING.  If not, see
 #include "cvutil_matlab_interface.h"
 #include "video.h"
 #include "cvutil_templates.h"
+#ifdef BUILD_GUI
 #include "figure.h"
+#endif
 
 #endif

cvutil/cvutil_core.cpp

@@ -33,8 +33,10 @@ along with cvutil; see the file COPYING.  If not, see
 #include "cvutil_bwskel.h"
 #include "cvutil_types.h"
 
+#ifdef BUILD_GUI
 #include "MainWindow/MainWindow.h"
 #include "MainWindow/MaterialStyle.h"
+#endif
 
 using namespace std;
 using namespace cv;
@@ -311,6 +313,7 @@ vector<vector<int>> cvutil::getConnectedComponents(Mat img, Mat& lab, int size,
     return result;
 }
 
+#ifdef BUILD_GUI
 void onMouse(int event, int _x, int _y, int flags, void *data)
 {
     if (event != EVENT_LBUTTONUP && //event != EVENT_MOUSEMOVE && 
@@ -441,6 +444,7 @@ void onMouse(int event, int _x, int _y, int flags, void *data)
 
     m.release();
 }
+#endif
 
 void cvutil::printheader(Mat m)
 {
@@ -454,6 +458,7 @@ void cvutil::printheader(Mat m)
         cout << m << endl;
 }
 
+#ifdef BUILD_GUI
 // Similar to imshow() in opencv, but has 
 //     * An onMouse event Handler.
 //     * We do not have to call namedWindow() before calling
@@ -502,6 +507,7 @@ void cvutil::window(cv::String winname, Mat m)
     setMouseCallback(winname, onMouse, static_cast<void*>(wd));
     waitKey(0);
 }
+#endif
 
 Mat cvutil::bwthin(Mat input)
 {
@@ -775,7 +781,7 @@ void cvutil::init(int &argc, char *argv[], bool useOpt, bool useGUI)
 {
     // Enable the OpenCV to use hardware acceleration.
     setUseOptimized(useOpt);
-
+#ifdef BUILD_GUI
     // Initialize Qt sub-system.
     if (useGUI)
     {
@@ -787,6 +793,7 @@ void cvutil::init(int &argc, char *argv[], bool useOpt, bool useGUI)
         GlobalValues::app = nullptr;
         GlobalValues::coreapp = new QCoreApplication(argc, argv);
     }
+#endif
 
     //QApplication::setStyle(new MaterialStyle());
 
@@ -888,6 +895,7 @@ Mat cvutil::getImageFromComponents(Size sz, vector<vector<int>> components)
     return result;
 }
 
+#ifdef BUILD_GUI
 Ptr<cvutilWindow> cvutil::getImageProcessorWindow(QIcon appico)
 {
     static MainWindow *result = nullptr;
@@ -902,20 +910,25 @@ Ptr<cvutilWindow> cvutil::getImageProcessorWindow(QIcon appico)
         return result;
     }
 }
+#endif
 
 Mat cvutil::imread(QString& filename, int flags)
 {
+#ifdef BUILD_GUI
     QFile file(filename);
     if (!file.open(QFile::ReadOnly))
         return Mat();
     QByteArray arr = file.readAll();
     file.close();
-
     return imdecode(vector<uchar>(arr.begin(), arr.end()), flags);
+#else
+    return imread(filename, flags);
+#endif
 }
 
 bool cvutil::imwrite(QString filename, Mat img, const std::vector<int> & params)
 {
+#ifdef BUILD_GUI
     if (filename.length() == 0)
     {
         qCritical() << "Cannot save the image.";
@@ -959,6 +972,9 @@ bool cvutil::imwrite(QString filename, Mat img, const std::vector<int> & params)
     file.write(arr);
     file.close();
 
+#else
+    bool result = imwrite(filename, img, params);
+#endif
     return result;
 }
 

cvutil/cvutil_core.h

@@ -33,6 +33,10 @@ along with cvutil; see the file COPYING.  If not, see
 
 #include "cvutil.h"
 
+#ifndef BUILD_GUI
+typedef cv::String QString;
+#endif
+
 namespace cvutil
 {
     CVUTILAPI cv::Mat getSingleChannel(cv::Mat m);

cvutil/cvutil_matlab_interface.h

@@ -32,7 +32,9 @@ along with cvutil; see the file COPYING.  If not, see
 #define MATLAB_INTERFACE_H
 
 #include "cvutil.h"
+#ifdef BUILD_GUI
 #include "figure.h"
+#endif
 
 #define bwconncomp   getConnectedComponents