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Can we use FRAME_RIF to return a Lisp_Object result?
From: |
Keith David Bershatsky |
Subject: |
Can we use FRAME_RIF to return a Lisp_Object result? |
Date: |
Tue, 31 Oct 2017 11:44:02 -0700 |
As part of the multiple fake cursors (22873) and crosshairs (17684) features
that I am working on, I am obtaining the red / green / blue values for the
buffer default background face by using platform specific functions within
nsterm.m, xterm.c, and w32term.c.
I would like `FRAME_RIF (f)->calc_lsl_default_bg (w)` to return a Lisp_Object
in the form of a vector consisting of 3 doubles.
All of the examples in redisplay_interface are void, which makes me think that
a Lisp_Object result may not be supported.
I have been using window pointers to store the values for red, green and blue.
However, I would like to eliminate the need to use those window pointers in
favor of FRAME_RIF returning a Lisp_Object result. Is this okay to do, or is
there a more appropriate way to get the result of those platform specific
functions?
/* window.h */
/* Suffixes for the `mc` window pointer prefix. */
struct multiple_cursors
{
* * *
/* Values for the background color that are used to erase a glyphless cursor.
*/
double bg_red, bg_green, bg_blue;
* * *
};
/* nsterm.m */
static void
ns_calc_lsl_default_bg (struct window *w)
{
struct frame *f = XFRAME (WINDOW_FRAME (w));
/* The default face, possibly remapped. */
struct face *default_face = FACE_FROM_ID (f, lookup_basic_face (f,
DEFAULT_FACE_ID));
NSColor *background_color = ns_lookup_indexed_color
(default_face->background, f);
EmacsCGFloat red, green, blue;
* * *
w->mc.bg_red = red;
w->mc.bg_green = green;
w->mc.bg_blue = blue;
* * *
}
/* dispextern.h */
struct redisplay_interface
{
/* Handlers for setting frame parameters. */
frame_parm_handler *frame_parm_handlers;
* * *
void (*calc_lsl_default_bg) (struct window *w);
* * *
};
Thanks,
Keith
- Can we use FRAME_RIF to return a Lisp_Object result?,
Keith David Bershatsky <=