setrgbcmap.c

早期freebsd实现

/* Copyright 1989 Massachusetts Institute of Technolgoy */
/* $XConsortium: SetRGBCMap.c,v 1.4 91/01/08 14:40:02 gildea Exp $ */

/*
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation, and that the name of M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.
*/

#include <X11/Xlibint.h>
#include <X11/Xutil.h>
#include "Xatomtype.h"
#include <X11/Xatom.h>

void XSetRGBColormaps (dpy, w, cmaps, count, property)
    Display *dpy;
    Window w;
    XStandardColormap *cmaps;
    int count;
    Atom property;			/* XA_RGB_BEST_MAP, etc. */
{
    register int i;			/* iterator variable */
    register xPropStandardColormap *map;  /* tmp variable, data in prop */
    register XStandardColormap *cmap;	/* tmp variable, user data */
    xPropStandardColormap *data, tmpdata;  /* scratch data */
    int mode = PropModeReplace;		/* for partial writes */
    Bool alloced_scratch_space;		/* do we need to free? */
	

    if (count < 1) return;

    /*
     * if doing more than one, allocate scratch space for it
     */
    if ((count > 1) && ((data = ((xPropStandardColormap *)
				 Xmalloc(count*sizeof(xPropStandardColormap))))
			 != NULL)) {
	alloced_scratch_space = True;
    } else {
	data = &tmpdata;
	alloced_scratch_space = False;
    }


    /*
     * Do the iteration.  If using temp space put out each part of the prop;
     * otherwise, wait until the end and blast it all at once.
     */
    for (i = count, map = data, cmap = cmaps; i > 0; i--, cmap++) {
	map->colormap	= cmap->colormap;
	map->red_max	= cmap->red_max;
	map->red_mult	= cmap->red_mult;
	map->green_max	= cmap->green_max;
	map->green_mult	= cmap->green_mult;
	map->blue_max	= cmap->blue_max;
	map->blue_mult	= cmap->blue_mult;
	map->base_pixel	= cmap->base_pixel;
	map->visualid	= cmap->visualid;
	map->killid	= cmap->killid;

	if (alloced_scratch_space) {
	    map++;
	} else {
	    XChangeProperty (dpy, w, property, XA_RGB_COLOR_MAP, 32, mode,
			     (unsigned char *) data,
			     NumPropStandardColormapElements);
	    mode = PropModeAppend;
	}
    }

    if (alloced_scratch_space) {
	XChangeProperty (dpy, w, property, XA_RGB_COLOR_MAP, 32,
			 PropModeReplace, (unsigned char *) data,
			 (int) (count * NumPropStandardColormapElements));
	Xfree ((char *) data);
    }
}