Re: screen-gamma not always effective?

[Chong Yidong]

>     In all cases I am seeing the same effect: those parts of the screen
>     showing text are displayed in the gamma corrected colour, the other
>     parts of the screen remain remain in the brighter uncorrected colour.
>
> Well, that suggests that some places in Emacs are using the specified
> color without calling gamma_correct first.

Does this patch fix the problem?

*** emacs/src/frame.c.~1.337.~  2007-02-06 17:40:47.000000000 -0500
--- emacs/src/frame.c   2007-02-10 14:46:17.000000000 -0500
***************
*** 3058,3065 ****
    if (NILP (new_value))
      f->gamma = 0;
    else if (NUMBERP (new_value) && XFLOATINT (new_value) > 0)
!     /* The value 0.4545 is the normal viewing gamma.  */
!     f->gamma = 1.0 / (0.4545 * XFLOATINT (new_value));
    else
      signal_error ("Invalid screen-gamma", new_value);
  
--- 3058,3068 ----
    if (NILP (new_value))
      f->gamma = 0;
    else if (NUMBERP (new_value) && XFLOATINT (new_value) > 0)
!     {
!       Fclear_face_cache (Qnil);
!       /* The value 0.4545 is the normal viewing gamma.  */
!       f->gamma = 1.0 / (0.4545 * XFLOATINT (new_value));
!     }
    else
      signal_error ("Invalid screen-gamma", new_value);