diff options
| -rw-r--r-- | test.c | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -49,6 +49,27 @@ /** + * Invertion mapping function from [0, 1] float encoding value to [0, 2¹⁶ − 1] integer output value + * + * @param encoding [0, 1] float encoding value + * @return [0, 2¹⁶ − 1] integer output value + */ +LIBGAMMA_GCC_ONLY__(__attribute__((__const__))) +static uint16_t +inv_ramps16(float encoding) +{ + double i_encoding = (double)(1.f - encoding); + double f_output = (double)UINT16_MAX * i_encoding; + uint16_t output = (uint16_t)f_output; + if (i_encoding < (double)0.25f && output > UINT16_MAX / 2) + output = 0; + if (i_encoding > (double)0.75f && output < UINT16_MAX / 2) + output = UINT16_MAX; + return output; +} + + +/** * Test mapping function from [0, 1] float encoding value to [0, 2⁸ − 1] integer output value * * @param encoding [0, 1] float encoding value @@ -1516,6 +1537,16 @@ main(void) libgamma_perror("libgamma_crtc_set_gamma_ramps64", r); printf("Done!\n"); + /* Test inversion (does not work properly on all devices) */ + printf("Inverting monitor output for 1 second... (does not work properly on all devices) (ramps16)\n"); + if ((rr |= r = libgamma_crtc_set_gamma_ramps16_f(crtc_state, inv_ramps16, inv_ramps16, inv_ramps16))) + libgamma_perror("libgamma_crtc_set_gamma_ramps16_f", r); + sleep(1); + if ((rr |= r = libgamma_crtc_set_gamma_ramps16(crtc_state, &old_ramps16))) + libgamma_perror("libgamma_crtc_set_gamma_ramps16", r); + printf("Done!\n"); + sleep(1); + /* TODO Test gamma ramp restore functions */ done: |