(Question) Flip/Mirror image OpenGL

[Klonoa88]

How do i flip/mirror a image?

Rotate works with:
g_painter->saveAndResetState();
g_painter->rotate(dest.x, dest.y, 180);
Draw();
g_painter->restoreSavedState();

But do not understand how to do flip. Have googled and read a lot but it does not work