Timing pixel format functions

test.c

#include <windows.h>
#include <stdio.h>

int main()
{
    HWND wnd = CreateWindowA("STATIC", "test", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, NULL, NULL);
    if (!wnd)
    {
        printf("CreateWindow error\n");
        return 0;
    }

    HDC dc = GetDC(wnd);
    if (!dc)
    {
        printf("GetDC error\n");
        return 0;
    }

    PIXELFORMATDESCRIPTOR pfd =
    {
        .nSize = sizeof(pfd),
        .nVersion = 1,
        .dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL,
        .iPixelType = PFD_TYPE_RGBA,
        .cColorBits = 24,
        .iLayerType = PFD_MAIN_PLANE,
    };

    LARGE_INTEGER f, t1, t2;
    QueryPerformanceFrequency(&f);
    QueryPerformanceCounter(&t1);

    int pf = ChoosePixelFormat(dc, &pfd);
    if (!pf)
    {
        printf("ChoosePixelFormat error\n");
        return 0;
    }

    BOOL set = SetPixelFormat(dc, pf, &pfd);
    if (!set)
    {
        printf("SetPixelFormat error\n");
        return 0;
    }

    QueryPerformanceCounter(&t2);
    printf("%.3f\n", (double)(t2.QuadPart - t1.QuadPart)/f.QuadPart);
}