func (window *Win32Window) GetHDC() unsafe.Pointer {
if window.hdc != nil {
return unsafe.Pointer(&window.hdc)
}
window.hdc = C.GetDC(window.hwnd)
px := C.PIXELFORMATDESCRIPTOR{
dwFlags: 0x00000001 | 0x00000020 | 0x00000004,
iPixelType: 0,
cColorBits: 32,
cDepthBits: 32,
iLayerType: 0,
}
px.nSize = (C.WORD)(unsafe.Sizeof(px))
pxFormat := C.ChoosePX(window.hdc, &px)
if pxFormat == 0 {
return nil
}
res := C.SetPixelFormat(window.hdc, pxFormat, &px)
if res == 0 {
return nil
}
return unsafe.Pointer(&window.hdc)
}
