vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_BETTER);
vgSeti(VG_IMAGE_QUALITY, VG_IMAGE_QUALITY_BETTER);
// clear with a clamped color
vgSeti(VG_SCISSORING, VG_FALSE);
col[0] = -0.3f; col[1] = 0.8f; col[2] = 1.7f; col[3] = 1.0f;
vgSetfv(VG_CLEAR_COLOR, 4, col);
vgClear(0, 0, 256, 256);
eglSwapBuffers(display, surface);

saveDrawingSurface(f, "vgclear01.png", "vgClear with clamped color.", 0, 0, 256, 256);