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Commitefa4d91

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Merge pull request#25661 from itlab-vision:framebuffer
Highgui backend on top of Framebuffer#25661### Pull Request Readiness ChecklistSee details athttps://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request- [ x] I agree to contribute to the project under Apache 2 License.- [ x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV- [ x] The PR is proposed to the proper branch- [ ] There is a reference to the original bug report and related work- [ x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name.- [ x] The feature is well documented and sample code can be built with the project CMakeEnvironment variables used:OPENCV_UI_BACKEND - you need to add the value “FB”OPENCV_UI_PRIORITY_FB - requires priority indicationOPENCV_HIGHGUI_FB_MODE={FB|XVFB|EMU} - mode of using Framebuffer (default "FB")- FB - Linux Framebuffer- XVFB - virtual Framebuffer- EMU - emulation (images are not displayed)OPENCV_HIGHGUI_FB_DEVICE (FRAMEBUFFER) - path to the Framebuffer file (default "/dev/fb0").Examples of using:sudo OPENCV_UI_BACKEND=FB ./opencv_test_highguisudo OPENCV_UI_PRIORITY_FB=1111 ./opencv_test_highguiOPENCV_UI_BACKEND=FB OPENCV_HIGHGUI_FB_MODE=EMU ./opencv_test_highguisudo OPENCV_UI_BACKEND=FB OPENCV_HIGHGUI_FB_MODE=FB ./opencv_test_highguiexport DISPLAY=:99Xvfb $DISPLAY -screen 0 1024x768x24 -fbdir /tmp/ -f /tmp/user.xvfb.auth&sudo -u sipeed XAUTHORITY=/tmp/user.xvfb.auth x11vnc -display $DISPLAY -listen localhost&DISPLAY=:0 gvncviewer localhost&FRAMEBUFFER=/tmp/Xvfb_screen0 OPENCV_UI_BACKEND=FB OPENCV_HIGHGUI_FB_MODE=XVFB ./opencv_test_highgui
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10 files changed

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‎CMakeLists.txt‎

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@@ -306,6 +306,10 @@ OCV_OPTION(WITH_GTK "Include GTK support" ON
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OCV_OPTION(WITH_GTK_2_X"Use GTK version 2"OFF
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VISIBLE_IFUNIXANDNOTAPPLEANDNOT ANDROID
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VERIFY HAVE_GTKANDNOT HAVE_GTK3)
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OCV_OPTION(WITH_FRAMEBUFFER"Include framebuffer support"OFF
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VISIBLE_IFUNIXANDNOTAPPLEANDNOT ANDROID)
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OCV_OPTION(WITH_FRAMEBUFFER_XVFB"Include virtual framebuffer support"OFF
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VISIBLE_IFUNIXANDNOTAPPLEANDNOT ANDROID)
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OCV_OPTION(WITH_WAYLAND"Include Wayland support"OFF
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VISIBLE_IFUNIXANDNOTAPPLEANDNOT ANDROID
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VERIFY HAVE_WAYLAND)
@@ -1462,6 +1466,13 @@ if(WITH_GTK OR HAVE_GTK)
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endif()
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endif()
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if(WITH_FRAMEBUFFEROR HAVE_FRAMEBUFFER)
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status(" Framebuffer UI:" HAVE_FRAMEBUFFER THENYES ELSENO)
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if(WITH_FRAMEBUFFER_XVFBOR HAVE_FRAMEBUFFER_XVFB)
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status(" Virtual framebuffer UI:" HAVE_FRAMEBUFFER_XVFB THENYES ELSENO)
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endif()
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endif()
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if(WITH_OPENGLOR HAVE_OPENGL)
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status(" OpenGL support:" HAVE_OPENGL THEN"YES (${OPENGL_LIBRARIES})" ELSENO)
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endif()

‎cmake/checks/framebuffer.cpp‎

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@@ -0,0 +1,9 @@
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#include<X11/XWDFile.h>
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#include<X11/X.h>
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intmain(void)
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{
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XWDFileHeader *xwd_header;
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XWDColor *xwd_colors;
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return0;
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}

‎modules/highgui/CMakeLists.txt‎

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@@ -49,6 +49,16 @@ list(REMOVE_ITEM highgui_ext_hdrs "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/${n
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set(OPENCV_HIGHGUI_BUILTIN_BACKEND"")
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if(WITH_FRAMEBUFFERAND HAVE_FRAMEBUFFER)
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set(OPENCV_HIGHGUI_BUILTIN_BACKEND"FB")
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add_definitions(-DHAVE_FRAMEBUFFER)
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list(APPEND highgui_srcs${CMAKE_CURRENT_LIST_DIR}/src/window_framebuffer.cpp)
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list(APPEND highgui_hdrs${CMAKE_CURRENT_LIST_DIR}/src/window_framebuffer.hpp)
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if(HAVE_FRAMEBUFFER_XVFB)
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add_definitions(-DHAVE_FRAMEBUFFER_XVFB)
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endif()
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endif()
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if(WITH_WAYLANDAND HAVE_WAYLAND)
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set(OPENCV_HIGHGUI_BUILTIN_BACKEND"Wayland")
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add_definitions(-DHAVE_WAYLAND)
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# --- FB ---
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set(HAVE_FRAMEBUFFERON)
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if(WITH_FRAMEBUFFER_XVFB)
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try_compile(HAVE_FRAMEBUFFER_XVFB
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"${CMAKE_CURRENT_BINARY_DIR}"
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"${OpenCV_SOURCE_DIR}/cmake/checks/framebuffer.cpp")
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if(HAVE_FRAMEBUFFER_XVFB)
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message(STATUS"Check virtual framebuffer - done")
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else()
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message(STATUS
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"Check virtual framebuffer - failed\n"
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"Please install the xorg-x11-proto-devel or x11proto-dev package\n")
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endif()
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endif()

‎modules/highgui/cmake/init.cmake‎

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@@ -39,6 +39,8 @@ endmacro()
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add_backend("gtk" WITH_GTK)
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add_backend("win32ui" WITH_WIN32UI)
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add_backend("wayland" WITH_WAYLAND)
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add_backend("framebuffer" WITH_FRAMEBUFFER)
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# TODO cocoa
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# TODO qt
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# TODO opengl

‎modules/highgui/src/backend.hpp‎

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@@ -127,6 +127,10 @@ std::shared_ptr<UIBackend> createUIBackendGTK();
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std::shared_ptr<UIBackend> createUIBackendQT();
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#endif
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#ifdef HAVE_FRAMEBUFFER
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std::shared_ptr<UIBackend>createUIBackendFramebuffer();
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#endif
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#endif// BUILD_PLUGIN
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}// namespace highgui_backend

‎modules/highgui/src/registry.impl.hpp‎

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@@ -44,6 +44,10 @@ std::vector<BackendInfo>& getBuiltinBackendsInfo()
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DECLARE_DYNAMIC_BACKEND("GTK2")
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#endif
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#ifdef HAVE_FRAMEBUFFER
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DECLARE_STATIC_BACKEND("FB", createUIBackendFramebuffer)
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#endif
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#if0 // TODO
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#ifdef HAVE_QT
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DECLARE_STATIC_BACKEND("QT", createUIBackendQT)

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