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Alia5/transparent_sfml.cpp

Last active July 28, 2025 12:30
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  1. Alia5 revised this gist Nov 14, 2016. 1 changed file with 48 additions and 114 deletions.
    162 changes: 48 additions & 114 deletions transparent_sfml.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -1,126 +1,60 @@
    #include <SFML/Graphics.hpp>
    #include <cmath>
    #include <windows.h>
    #include <Windows.h>
    #include <Dwmapi.h>

    bool setShape(HWND hWnd, const sf::Image& image)
    {
    const sf::Uint8* pixelData = image.getPixelsPtr();
    HRGN hRegion = CreateRectRgn(0, 0, image.getSize().x, image.getSize().y);

    // Determine the visible region
    for (unsigned int y = 0; y < image.getSize().y; y++)
    {
    for (unsigned int x = 0; x < image.getSize().x; x++)
    {
    if (pixelData[y * image.getSize().x * 4 + x * 4 + 3] == 0)
    {
    HRGN hRegionDest = CreateRectRgn(0, 0, 1, 1);
    HRGN hRegionPixel = CreateRectRgn(x, y, x + 1, y + 1);
    CombineRgn(hRegionDest, hRegion, hRegionPixel, RGN_XOR);
    DeleteObject(hRegion);
    DeleteObject(hRegionPixel);
    hRegion = hRegionDest;
    }
    }
    }
    #pragma comment (lib, "Dwmapi.lib")

    SetWindowRgn(hWnd, hRegion, true);
    DeleteObject(hRegion);
    return true;
    }

    bool setTransparency(HWND hWnd, unsigned char alpha)
    {
    SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
    SetLayeredWindowAttributes(hWnd, 0, alpha, LWA_ALPHA);
    return true;
    }

    int main()
    {
    sf::RenderWindow window(sf::VideoMode(1280, 720), "Transparent Window");
    window.setFramerateLimit(60);


    sf::Vector2i grabbedOffset;
    bool grabbedWindow = false;

    const unsigned char opacity = 255;


    sf::Image backgroundImage;
    backgroundImage.loadFromFile("image.png");



    sf::Vector2u pixsize = backgroundImage.getSize();
    sf::RenderWindow window(sf::VideoMode(pixsize.x,pixsize.y, 32), "Transparent Window", sf::Style::None);

    MARGINS margins;
    margins.cxLeftWidth = -1;


    setShape(window.getSystemHandle(), backgroundImage);
    setTransparency(window.getSystemHandle(), opacity);
    SetWindowLong(window.getSystemHandle(), GWL_STYLE, WS_POPUP | WS_VISIBLE);
    DwmExtendFrameIntoClientArea(window.getSystemHandle(), &margins);

    sf::Texture backgroundTexture;
    sf::Sprite backgroundSprite;
    backgroundTexture.loadFromImage(backgroundImage);
    backgroundSprite.setTexture(backgroundTexture);



    sf::RectangleShape rectangle;
    rectangle.setSize(sf::Vector2f(100, 50));

    while (window.isOpen())
    {
    SetWindowPos(window.getSystemHandle(), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);

    sf::Event event;
    while (window.pollEvent(event))
    {
    if (event.type == sf::Event::Closed)
    window.close();

    if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape)
    {
    //obsługa zajścia zdarzenia wciśnięcia klawisza ESC
    window.close(); //np. zamknięcie aplikacji
    }


    //Drag&Drop
    else if (event.type == sf::Event::MouseButtonPressed)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    {
    grabbedOffset = window.getPosition() - sf::Mouse::getPosition();
    grabbedWindow = true;
    }
    }
    else if (event.type == sf::Event::MouseButtonReleased)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    grabbedWindow = false;
    }
    else if (event.type == sf::Event::MouseMoved)
    {
    if (grabbedWindow)
    window.setPosition(sf::Mouse::getPosition() + grabbedOffset);
    }

    //





    } //while



    window.clear(sf::Color::Transparent);


    window.draw(backgroundSprite);

    //CircleShape for DemoContent
    sf::CircleShape shape(360.f);
    shape.setFillColor(sf::Color::Green);
    //\
    sf::Vector2i grabbedOffset;
    bool grabbedWindow = false;
    while (window.isOpen())
    {
    sf::Event event;
    while (window.pollEvent(event))
    {
    if (event.type == sf::Event::Closed || event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape)
    window.close();
    else if (event.type == sf::Event::MouseButtonPressed)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    {
    grabbedOffset = window.getPosition() - sf::Mouse::getPosition();
    grabbedWindow = true;
    }
    }
    else if (event.type == sf::Event::MouseButtonReleased)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    grabbedWindow = false;
    }
    else if (event.type == sf::Event::MouseMoved)
    {
    if (grabbedWindow)
    window.setPosition(sf::Mouse::getPosition() + grabbedOffset);
    }
    }

    window.clear(sf::Color::Transparent); //F*ck yeah it works as you would expect from the wording ;P
    window.draw(shape);
    window.display();
    } //while
    }
    return 0;

    }
  2. Alia5 renamed this gist Nov 13, 2016. 1 changed file with 0 additions and 0 deletions.
    0 gistfile1.txt → transparent_sfml.cpp
    View file
    File renamed without changes.
  3. Alia5 created this gist Nov 13, 2016.
    126 changes: 126 additions & 0 deletions gistfile1.txt
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,126 @@
    #include <SFML/Graphics.hpp>
    #include <cmath>
    #include <windows.h>

    bool setShape(HWND hWnd, const sf::Image& image)
    {
    const sf::Uint8* pixelData = image.getPixelsPtr();
    HRGN hRegion = CreateRectRgn(0, 0, image.getSize().x, image.getSize().y);

    // Determine the visible region
    for (unsigned int y = 0; y < image.getSize().y; y++)
    {
    for (unsigned int x = 0; x < image.getSize().x; x++)
    {
    if (pixelData[y * image.getSize().x * 4 + x * 4 + 3] == 0)
    {
    HRGN hRegionDest = CreateRectRgn(0, 0, 1, 1);
    HRGN hRegionPixel = CreateRectRgn(x, y, x + 1, y + 1);
    CombineRgn(hRegionDest, hRegion, hRegionPixel, RGN_XOR);
    DeleteObject(hRegion);
    DeleteObject(hRegionPixel);
    hRegion = hRegionDest;
    }
    }
    }

    SetWindowRgn(hWnd, hRegion, true);
    DeleteObject(hRegion);
    return true;
    }

    bool setTransparency(HWND hWnd, unsigned char alpha)
    {
    SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
    SetLayeredWindowAttributes(hWnd, 0, alpha, LWA_ALPHA);
    return true;
    }

    int main()
    {


    sf::Vector2i grabbedOffset;
    bool grabbedWindow = false;

    const unsigned char opacity = 255;


    sf::Image backgroundImage;
    backgroundImage.loadFromFile("image.png");



    sf::Vector2u pixsize = backgroundImage.getSize();
    sf::RenderWindow window(sf::VideoMode(pixsize.x,pixsize.y, 32), "Transparent Window", sf::Style::None);



    setShape(window.getSystemHandle(), backgroundImage);
    setTransparency(window.getSystemHandle(), opacity);

    sf::Texture backgroundTexture;
    sf::Sprite backgroundSprite;
    backgroundTexture.loadFromImage(backgroundImage);
    backgroundSprite.setTexture(backgroundTexture);



    sf::RectangleShape rectangle;
    rectangle.setSize(sf::Vector2f(100, 50));

    while (window.isOpen())
    {
    SetWindowPos(window.getSystemHandle(), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);

    sf::Event event;
    while (window.pollEvent(event))
    {
    if (event.type == sf::Event::Closed)
    window.close();

    if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape)
    {
    //obsługa zajścia zdarzenia wciśnięcia klawisza ESC
    window.close(); //np. zamknięcie aplikacji
    }


    //Drag&Drop
    else if (event.type == sf::Event::MouseButtonPressed)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    {
    grabbedOffset = window.getPosition() - sf::Mouse::getPosition();
    grabbedWindow = true;
    }
    }
    else if (event.type == sf::Event::MouseButtonReleased)
    {
    if (event.mouseButton.button == sf::Mouse::Left)
    grabbedWindow = false;
    }
    else if (event.type == sf::Event::MouseMoved)
    {
    if (grabbedWindow)
    window.setPosition(sf::Mouse::getPosition() + grabbedOffset);
    }

    //





    } //while



    window.clear(sf::Color::Transparent);


    window.draw(backgroundSprite);
    window.display();
    } //while
    return 0;
    }