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1

Graphics / Re: HBITMAP --> sf::Texture/sf::Image using ::loadFromMemory

« on: June 29, 2023, 07:27:50 am »

Here is what I did.

sf::Texture texture;
void shotScreen() {
    int x = GetSystemMetrics(SM_XVIRTUALSCREEN);
    int y = GetSystemMetrics(SM_YVIRTUALSCREEN);
    int w = GetSystemMetrics(SM_CXVIRTUALSCREEN);
    int h = GetSystemMetrics(SM_CYVIRTUALSCREEN);
    HDC hScreen = GetDC(NULL);
    HDC hDC = CreateCompatibleDC(hScreen);
    HBITMAP hBitmap = CreateCompatibleBitmap(hScreen, w, h);
    DeleteObject(SelectObject(hDC, hBitmap));
    BOOL bRet = BitBlt(hDC, 0, 0, w, h, hScreen, x, y, SRCCOPY);
    unsigned int dataSize = ((w * 32 + 31) / 32) * 4 * h;
    BITMAPINFO Info = { sizeof(BITMAPINFOHEADER), static_cast<long>(w), static_cast<long>(0 - h), 1, 32, BI_RGB, dataSize, 0, 0, 0, 0 };
    std::uint8_t* pixels = new std::uint8_t[dataSize];
    int r = GetDIBits(hDC, hBitmap, 0, h, (LPVOID)pixels, &Info, DIB_RGB_COLORS);
    for (int x = 0; x < dataSize; x += 4)
    {
        auto r = pixels[x + 2];
        auto b = pixels[x];
        pixels[x] = r;
        pixels[x + 2] = b;
    }
    auto flag = texture.create(sf::Vector2u(w, h));
    texture.update(pixels);
    delete[] pixels;
    DeleteDC(hDC);
    ReleaseDC(NULL, hScreen);
    DeleteObject(hBitmap);
}