view lwlib/xlwgcs.c @ 665:fdefd0186b75

[xemacs-hg @ 2001-09-20 06:28:42 by ben] The great integral types renaming. The purpose of this is to rationalize the names used for various integral types, so that they match their intended uses and follow consist conventions, and eliminate types that were not semantically different from each other. The conventions are: -- All integral types that measure quantities of anything are signed. Some people disagree vociferously with this, but their arguments are mostly theoretical, and are vastly outweighed by the practical headaches of mixing signed and unsigned values, and more importantly by the far increased likelihood of inadvertent bugs: Because of the broken "viral" nature of unsigned quantities in C (operations involving mixed signed/unsigned are done unsigned, when exactly the opposite is nearly always wanted), even a single error in declaring a quantity unsigned that should be signed, or even the even more subtle error of comparing signed and unsigned values and forgetting the necessary cast, can be catastrophic, as comparisons will yield wrong results. -Wsign-compare is turned on specifically to catch this, but this tends to result in a great number of warnings when mixing signed and unsigned, and the casts are annoying. More has been written on this elsewhere. -- All such quantity types just mentioned boil down to EMACS_INT, which is 32 bits on 32-bit machines and 64 bits on 64-bit machines. This is guaranteed to be the same size as Lisp objects of type `int', and (as far as I can tell) of size_t (unsigned!) and ssize_t. The only type below that is not an EMACS_INT is Hashcode, which is an unsigned value of the same size as EMACS_INT. -- Type names should be relatively short (no more than 10 characters or so), with the first letter capitalized and no underscores if they can at all be avoided. -- "count" == a zero-based measurement of some quantity. Includes sizes, offsets, and indexes. -- "bpos" == a one-based measurement of a position in a buffer. "Charbpos" and "Bytebpos" count text in the buffer, rather than bytes in memory; thus Bytebpos does not directly correspond to the memory representation. Use "Membpos" for this. -- "Char" refers to internal-format characters, not to the C type "char", which is really a byte. -- For the actual name changes, see the script below. I ran the following script to do the conversion. (NOTE: This script is idempotent. You can safely run it multiple times and it will not screw up previous results -- in fact, it will do nothing if nothing has changed. Thus, it can be run repeatedly as necessary to handle patches coming in from old workspaces, or old branches.) There are two tags, just before and just after the change: `pre-integral-type-rename' and `post-integral-type-rename'. When merging code from the main trunk into a branch, the best thing to do is first merge up to `pre-integral-type-rename', then apply the script and associated changes, then merge from `post-integral-type-change' to the present. (Alternatively, just do the merging in one operation; but you may then have a lot of conflicts needing to be resolved by hand.) Script `fixtypes.sh' follows: ----------------------------------- cut ------------------------------------ files="*.[ch] s/*.h m/*.h config.h.in ../configure.in Makefile.in.in ../lib-src/*.[ch] ../lwlib/*.[ch]" gr Memory_Count Bytecount $files gr Lstream_Data_Count Bytecount $files gr Element_Count Elemcount $files gr Hash_Code Hashcode $files gr extcount bytecount $files gr bufpos charbpos $files gr bytind bytebpos $files gr memind membpos $files gr bufbyte intbyte $files gr Extcount Bytecount $files gr Bufpos Charbpos $files gr Bytind Bytebpos $files gr Memind Membpos $files gr Bufbyte Intbyte $files gr EXTCOUNT BYTECOUNT $files gr BUFPOS CHARBPOS $files gr BYTIND BYTEBPOS $files gr MEMIND MEMBPOS $files gr BUFBYTE INTBYTE $files gr MEMORY_COUNT BYTECOUNT $files gr LSTREAM_DATA_COUNT BYTECOUNT $files gr ELEMENT_COUNT ELEMCOUNT $files gr HASH_CODE HASHCODE $files ----------------------------------- cut ------------------------------------ `fixtypes.sh' is a Bourne-shell script; it uses 'gr': ----------------------------------- cut ------------------------------------ #!/bin/sh # Usage is like this: # gr FROM TO FILES ... # globally replace FROM with TO in FILES. FROM and TO are regular expressions. # backup files are stored in the `backup' directory. from="$1" to="$2" shift 2 echo ${1+"$@"} | xargs global-replace "s/$from/$to/g" ----------------------------------- cut ------------------------------------ `gr' in turn uses a Perl script to do its real work, `global-replace', which follows: ----------------------------------- cut ------------------------------------ : #-*- Perl -*- ### global-modify --- modify the contents of a file by a Perl expression ## Copyright (C) 1999 Martin Buchholz. ## Copyright (C) 2001 Ben Wing. ## Authors: Martin Buchholz <martin@xemacs.org>, Ben Wing <ben@xemacs.org> ## Maintainer: Ben Wing <ben@xemacs.org> ## Current Version: 1.0, May 5, 2001 # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. # # You should have received a copy of the GNU General Public License # along with XEmacs; see the file COPYING. If not, write to the Free # Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. eval 'exec perl -w -S $0 ${1+"$@"}' if 0; use strict; use FileHandle; use Carp; use Getopt::Long; use File::Basename; (my $myName = $0) =~ s@.*/@@; my $usage=" Usage: $myName [--help] [--backup-dir=DIR] [--line-mode] [--hunk-mode] PERLEXPR FILE ... Globally modify a file, either line by line or in one big hunk. Typical usage is like this: [with GNU print, GNU xargs: guaranteed to handle spaces, quotes, etc. in file names] find . -name '*.[ch]' -print0 | xargs -0 $0 's/\bCONST\b/const/g'\n [with non-GNU print, xargs] find . -name '*.[ch]' -print | xargs $0 's/\bCONST\b/const/g'\n The file is read in, either line by line (with --line-mode specified) or in one big hunk (with --hunk-mode specified; it's the default), and the Perl expression is then evalled with \$_ set to the line or hunk of text, including the terminating newline if there is one. It should destructively modify the value there, storing the changed result in \$_. Files in which any modifications are made are backed up to the directory specified using --backup-dir, or to `backup' by default. To disable this, use --backup-dir= with no argument. Hunk mode is the default because it is MUCH MUCH faster than line-by-line. Use line-by-line only when it matters, e.g. you want to do a replacement only once per line (the default without the `g' argument). Conversely, when using hunk mode, *ALWAYS* use `g'; otherwise, you will only make one replacement in the entire file! "; my %options = (); $Getopt::Long::ignorecase = 0; &GetOptions ( \%options, 'help', 'backup-dir=s', 'line-mode', 'hunk-mode', ); die $usage if $options{"help"} or @ARGV <= 1; my $code = shift; die $usage if grep (-d || ! -w, @ARGV); sub SafeOpen { open ((my $fh = new FileHandle), $_[0]); confess "Can't open $_[0]: $!" if ! defined $fh; return $fh; } sub SafeClose { close $_[0] or confess "Can't close $_[0]: $!"; } sub FileContents { my $fh = SafeOpen ("< $_[0]"); my $olddollarslash = $/; local $/ = undef; my $contents = <$fh>; $/ = $olddollarslash; return $contents; } sub WriteStringToFile { my $fh = SafeOpen ("> $_[0]"); binmode $fh; print $fh $_[1] or confess "$_[0]: $!\n"; SafeClose $fh; } foreach my $file (@ARGV) { my $changed_p = 0; my $new_contents = ""; if ($options{"line-mode"}) { my $fh = SafeOpen $file; while (<$fh>) { my $save_line = $_; eval $code; $changed_p = 1 if $save_line ne $_; $new_contents .= $_; } } else { my $orig_contents = $_ = FileContents $file; eval $code; if ($_ ne $orig_contents) { $changed_p = 1; $new_contents = $_; } } if ($changed_p) { my $backdir = $options{"backup-dir"}; $backdir = "backup" if !defined ($backdir); if ($backdir) { my ($name, $path, $suffix) = fileparse ($file, ""); my $backfulldir = $path . $backdir; my $backfile = "$backfulldir/$name"; mkdir $backfulldir, 0755 unless -d $backfulldir; print "modifying $file (original saved in $backfile)\n"; rename $file, $backfile; } WriteStringToFile ($file, $new_contents); } } ----------------------------------- cut ------------------------------------ In addition to those programs, I needed to fix up a few other things, particularly relating to the duplicate definitions of types, now that some types merged with others. Specifically: 1. in lisp.h, removed duplicate declarations of Bytecount. The changed code should now look like this: (In each code snippet below, the first and last lines are the same as the original, as are all lines outside of those lines. That allows you to locate the section to be replaced, and replace the stuff in that section, verifying that there isn't anything new added that would need to be kept.) --------------------------------- snip ------------------------------------- /* Counts of bytes or chars */ typedef EMACS_INT Bytecount; typedef EMACS_INT Charcount; /* Counts of elements */ typedef EMACS_INT Elemcount; /* Hash codes */ typedef unsigned long Hashcode; /* ------------------------ dynamic arrays ------------------- */ --------------------------------- snip ------------------------------------- 2. in lstream.h, removed duplicate declaration of Bytecount. Rewrote the comment about this type. The changed code should now look like this: --------------------------------- snip ------------------------------------- #endif /* The have been some arguments over the what the type should be that specifies a count of bytes in a data block to be written out or read in, using Lstream_read(), Lstream_write(), and related functions. Originally it was long, which worked fine; Martin "corrected" these to size_t and ssize_t on the grounds that this is theoretically cleaner and is in keeping with the C standards. Unfortunately, this practice is horribly error-prone due to design flaws in the way that mixed signed/unsigned arithmetic happens. In fact, by doing this change, Martin introduced a subtle but fatal error that caused the operation of sending large mail messages to the SMTP server under Windows to fail. By putting all values back to be signed, avoiding any signed/unsigned mixing, the bug immediately went away. The type then in use was Lstream_Data_Count, so that it be reverted cleanly if a vote came to that. Now it is Bytecount. Some earlier comments about why the type must be signed: This MUST BE SIGNED, since it also is used in functions that return the number of bytes actually read to or written from in an operation, and these functions can return -1 to signal error. Note that the standard Unix read() and write() functions define the count going in as a size_t, which is UNSIGNED, and the count going out as an ssize_t, which is SIGNED. This is a horrible design flaw. Not only is it highly likely to lead to logic errors when a -1 gets interpreted as a large positive number, but operations are bound to fail in all sorts of horrible ways when a number in the upper-half of the size_t range is passed in -- this number is unrepresentable as an ssize_t, so code that checks to see how many bytes are actually written (which is mandatory if you are dealing with certain types of devices) will get completely screwed up. --ben */ typedef enum lstream_buffering --------------------------------- snip ------------------------------------- 3. in dumper.c, there are four places, all inside of switch() statements, where XD_BYTECOUNT appears twice as a case tag. In each case, the two case blocks contain identical code, and you should *REMOVE THE SECOND* and leave the first.
author ben
date Thu, 20 Sep 2001 06:31:11 +0000
parents c33ae14dd6d0
children 04bc9d2f42c7
line wrap: on
line source

 /* Tabs Widget for XEmacs.
    Copyright (C) 1999 Edward A. Falk

 This file is part of XEmacs.

 XEmacs is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2, or (at your option) any
 later version.

 XEmacs is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.

 You should have received a copy of the GNU General Public License
 along with XEmacs; see the file COPYING.  If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */

/* Synched up with: Gcs.c 1.7 */

 /* #### This code is duplicated many times within lwlib and XEmacs. It
    should be modularised. */

/*
 * Gcs.c - Utility functions to allocate GCs.
 *
 * Author: Edward A. Falk
 *	   falk@falconer.vip.best.com
 *
 * Date: Sept 29, 1998
 */

/* Functions:
 *
 * GC AllocFgGC(w, fg, font)
 *	Return a GC with foreground set as specified.
 *	If font is None, then the returned GC is allocated with font specified
 *	as a "don't care" value.
 *
 * GC
 * AllocBackgroundGC(w, font)
 *	Return a GC with the foreground set to the widget's background color.
 *
 * GC
 * AllocGreyGC(w, fg, font, contrast, be_nice_to_cmap)
 *	Widget	w ;
 *	Pixel	fg ;
 *	Font	font ;
 *	int	contrast ;
 *	int	be_nice_to_cmap ;
 *
 *	Return a GC suitable for rendering a widget in its "inactive" color.
 *	Normally returns a GC with a color somewhere between the widget's
 *	background color and the specified foreground. If font is None, then
 *	the returned GC is allocated with font specified as "don't care".
 *	If be_nice_to_cmap is True, the returned GC is created using a 50%
 *	dither instead of a new color.
 *
 *
 * GC
 * AllocShadeGC(w, fg, bg, font, contrast, be_nice_to_cmap)
 *	Widget	w ;
 *	Pixel	fg, bg ;
 *	Font	font ;
 *	int	contrast ;
 *	int	be_nice_to_cmap ;
 *
 *	Return a GC suitable for rendering in a shade somewhere between
 *	bg and fg, as determined by contrast (0 = bg, 100 = fg)
 *	If font is None, then the returned GC is allocated with
 *	font specified as "don't care".  If be_nice_to_cmap
 *	is True, the returned GC is created using a 50% dither
 *	instead of a new color.
 *
 *
 * GC
 * AllocTopShadowGC(w, contrast, be_nice_to_cmap)
 *	Return a GC suitable for rendering the "top shadow" decorations of
 *	a widget.  Returns a GC with foreground computed from widget's
 *	background color and contrast.  If be_nice_to_cmap is True, the
 *	returned GC will use a foreground color of white.  If widget depth
 *	is 1, this function will use a foreground color of black.
 *
 * GC
 * AllocBotShadowGC(w, contrast, be_nice_to_cmap)
 *	Return a GC suitable for rendering the "bottom shadow" decorations
 *	of a widget. Returns a GC with foreground computed from widget's
 *	background color and contrast. If be_nice_to_cmap is True, the
 *	returned GC will use a foreground color of black.
 *
 * GC
 * AllocArmGC(w, contrast, be_nice_to_cmap)
 *	Return a GC suitable for rendering the "armed" decorations of a
 *	widget. This GC would typically be used to fill in the widget's
 *	background. Returns a GC with foreground computed from widget's
 *	background color and contrast.  If be_nice_to_cmap is True, the
 *	returned GC will use a foreground color of black and a 50% dither.
 *
 *
 * void
 * Draw3dBox(w, x,y,wid,hgt,s, topgc, botgc)
 *	Utility function.  Draws a raised shadow box with outside dimensions
 *	as specified by x,y,wid,hgt and shadow width specified by s.
 *	A lowered shadow box may be generated by swapping topgc and botgc.
 *
 */

#include	<config.h>
#include	<stdio.h>

#include	<X11/Xlib.h>
#include	<X11/IntrinsicP.h>
#include	<X11/StringDefs.h>
#include	"../src/xmu.h"
#include	"xlwgcs.h"

	/* Color & GC allocation.
	 *
	 * Frame widgets use the following graphics contexts:
	 *
	 *  Foreground		tab label text drawn this way
	 *  Insensitive Fg	foreground color greyed out.
	 *  Background		frame background color
	 *  Top shadow		upper-left highlight around widget
	 *  Bottom shadow	lower-right highlight around widget
	 *  Arm shadow		button pressed and ready to be released
	 *
	 *
	 * GC's are defined as follows, depending on attributes and
	 * window depth:
	 *
	 * Monochrome:
	 *	Foreground = foreground color attribute or BlackPixel()
	 *	Grey = Foreground color + 50% dither
	 *	Background = background color attribute or WhitePixel()
	 *	top shadow = foreground
	 *	bottom shadow = foreground
	 *	arm shadow = (what?)
	 *
	 * Color, beNiceToColormap=true:
	 *	Foreground = foreground color attribute or BlackPixel()
	 *	Grey = Foreground color + 50% dither
	 *	Background = background color attribute or WhitePixel()
	 *	top shadow = white
	 *	bottom shadow = black
	 *	arm shadow = (what?)
	 *
	 * Color, beNiceToColormap=false:
	 *	Foreground = foreground color attribute or BlackPixel()
	 *	Grey = (foreground color + background color)/2
	 *	Background = background color attribute or WhitePixel()
	 *	top shadow = background * 1.2
	 *	bottom shadow = background * .6
	 *	arm shadow = background * .8
	 *
	 * Special cases:
	 *	If background is white,   ??
	 *	if background is black,   ??
	 *
	 *
	 * If the widget's background is solid white or solid black,
	 * this code just picks some numbers.  (The choice is designed
	 * to be compatible with ThreeD interface.)
	 */



#if	XtSpecificationRelease	< 5

static	GC	XtAllocateGC(Widget, int, unsigned long, XGCValues *,
			     unsigned long, unsigned long) ;

#endif


#if	NeedFunctionPrototypes
static	Pixmap	getDitherPixmap(Widget, int contrast) ;
#else
static	Pixmap	getDitherPixmap() ;
#endif

	/* return a GC with the specified foreground and optional font */

GC
AllocFgGC(Widget w, Pixel fg, Font font)
{
	XGCValues	values ;
	unsigned long	vmask, dcmask ;

	values.foreground = fg ;
	values.font = font ;

	if( font != None ) {
	  vmask = GCForeground|GCFont ;
	  dcmask = GCSubwindowMode|GCDashOffset|
		GCDashList|GCArcMode|GCBackground|GCGraphicsExposures ;
	} else {
	  vmask = GCForeground ;
	  dcmask = GCFont|GCSubwindowMode|GCDashOffset|
		GCDashList|GCArcMode|GCBackground|GCGraphicsExposures ;
	}

	return XtAllocateGC(w, w->core.depth, vmask, &values, 0L, dcmask) ;
}


	/* return gc with widget background color as the foreground */

GC
AllocBackgroundGC(Widget w, Font font)
{
	return AllocFgGC(w, w->core.background_pixel, font) ;
}


	/* Allocate an "inactive" GC.  Color is grey (possibly via
	 * dither pattern).
	 */

GC
AllocGreyGC(Widget w, Pixel fg, Font font, int contrast, Bool be_nice_to_cmap)
{
	return AllocShadeGC(w, fg, w->core.background_pixel,
		font, contrast, be_nice_to_cmap) ;
}


	/* Allocate a GC somewhere between two colors.  */

GC
AllocShadeGC(Widget w, Pixel fg, Pixel bg, Font font,
	int contrast, Bool be_nice_to_cmap)
{
	XGCValues	values ;
	unsigned long	vmask, dcmask ;

	values.foreground = fg ;
	values.background = bg ;
	values.font = font ;

	if( font != None ) {
	  vmask = GCForeground|GCFont ;
	  dcmask = GCSubwindowMode|GCDashOffset|
		GCDashList|GCArcMode|GCGraphicsExposures ;
	} else {
	  vmask = GCForeground;
	  dcmask = GCFont|GCSubwindowMode|GCDashOffset|
		GCDashList|GCArcMode|GCGraphicsExposures ;
	}
#ifdef HAVE_XMU
	if( be_nice_to_cmap || w->core.depth == 1)
	{
	  if( contrast <= 5 )
	    values.foreground = bg ;
	  else if( contrast >= 95 )
	    values.foreground = fg ;
	  else {
	    vmask |= GCBackground|GCStipple|GCFillStyle ;
	    values.fill_style = FillOpaqueStippled ;
	    values.stipple = getDitherPixmap(w, contrast) ;
	  }

	  return XtAllocateGC(w, w->core.depth, vmask, &values, 0L, dcmask) ;
	}
	else
#endif
	{
	  dcmask |= GCBackground ;
	  values.foreground = AllocGreyPixel(w, fg, bg, contrast) ;
	  return XtAllocateGC(w, w->core.depth, vmask, &values, 0L, dcmask) ;
	}
}

	/* return top-shadow gc. */

GC
AllocTopShadowGC(Widget w, int contrast, Bool be_nice_to_cmap)
{
	Screen		*scr = XtScreen (w);
	XGCValues	values ;

	if( w->core.depth == 1 )
	  values.foreground = BlackPixelOfScreen(scr) ;
	else if( be_nice_to_cmap )
	  values.foreground = WhitePixelOfScreen(scr) ;
	else
	  values.foreground = AllocShadowPixel(w, 100+contrast) ;

	return XtAllocateGC(w, w->core.depth,
	    GCForeground, &values,
	    0L,
	    GCBackground|GCFont|GCSubwindowMode|GCGraphicsExposures|
		GCDashOffset|GCDashList|GCArcMode) ;
}

	/* return bottom-shadow gc. */

GC
AllocBotShadowGC(Widget w, int contrast, Bool be_nice_to_cmap)
{
	Screen		*scr = XtScreen (w);
	XGCValues	values ;

	if( w->core.depth == 1 || be_nice_to_cmap )
	  values.foreground = BlackPixelOfScreen(scr) ;
	else
	  values.foreground = AllocShadowPixel(w, 100-contrast) ;

	return XtAllocateGC(w, w->core.depth,
	    GCForeground, &values,
	    0L,
	    GCBackground|GCFont|GCSubwindowMode|GCGraphicsExposures|
		GCDashOffset|GCDashList|GCArcMode) ;
}

	/* return arm-shadow gc. */

GC
AllocArmGC(Widget w, int contrast, Bool be_nice_to_cmap)
{
	Screen		*scr = XtScreen (w);
	XGCValues	values ;

	/* Not clear exactly what we should do here.  Take a look at
	 * Xaw3d to see what they do.
	 */
#ifdef HAVE_XMU
	if( w->core.depth == 1 || be_nice_to_cmap )
	{
	  values.background = w->core.background_pixel ;
	  if( values.background == BlackPixelOfScreen(scr) )
	    values.foreground = WhitePixelOfScreen(scr) ;
	  else
	    values.foreground = BlackPixelOfScreen(scr) ;
	  values.fill_style = FillStippled ;
	  values.stipple = XmuCreateStippledPixmap(XtScreen(w), 1L, 0L, 1) ;

	  return XtAllocateGC(w, w->core.depth,
	      GCForeground|GCBackground|GCStipple|GCFillStyle,
	      &values, 0L,
	      GCFont|GCSubwindowMode|GCGraphicsExposures|
		  GCDashOffset|GCDashList|GCArcMode) ;
	}
	else
#endif
	  {
	  values.foreground = AllocShadowPixel(w, 100-contrast) ;
	  return XtAllocateGC(w, w->core.depth,
	      GCForeground, &values,
	      0L,
	      GCBackground|GCFont|GCSubwindowMode|GCGraphicsExposures|
		  GCDashOffset|GCDashList|GCArcMode) ;
	}
}


Pixel
AllocShadowPixel(Widget w, int scale)
{
	XColor	get_c, set_c ;
	Display	*dpy = XtDisplay(w) ;
	Screen	*scr = XtScreen(w) ;
	Colormap cmap ;
	Pixel	maxColor ;

	cmap = w->core.colormap ;

	get_c.pixel = w->core.background_pixel ;
	if( get_c.pixel == WhitePixelOfScreen(scr)  ||
	    get_c.pixel == BlackPixelOfScreen(scr) )
	{
	  /* what we *ought* to do is choose gray75 as the base color,
	   * or perhaps gray83.  Instead, we choose colors that are
	   * the same as ThreeD would choose.
	   */
	  if( scale > 100 )	scale = 200 - scale ;
	  set_c.red = set_c.green = set_c.blue = 65535*scale/100 ;
	}
	else
	{
	  XQueryColor(dpy, cmap, &get_c) ;
	  /* adjust scale so that brightest component does not
	   * exceed 65535; otherwise hue would change.
	   */
	  if( scale > 100 ) {
	    maxColor = Max(get_c.red, Max(get_c.green, get_c.blue)) ;
	    if( scale*maxColor > 65535*100 )
	      scale = 65535*100/maxColor ;
	  }
	  set_c.red = scale * get_c.red / 100 ;
	  set_c.green = scale * get_c.green / 100 ;
	  set_c.blue = scale * get_c.blue / 100 ;
	}
	set_c.flags = DoRed | DoGreen | DoBlue ;
	if( XAllocColor(dpy, cmap, &set_c) )
	  return set_c.pixel ;
	else if( scale > 100 )
	  return WhitePixelOfScreen(scr) ;
	else
	  return BlackPixelOfScreen(scr) ;
}


	/* Allocate a pixel partway between foreground and background */


Pixel
AllocGreyPixel(Widget w, Pixel fg, Pixel bg, int scale)
{
  XColor	get_cf, get_cb ;
  Display	*dpy = XtDisplay(w) ;
  Colormap cmap ;

  cmap = w->core.colormap ;

  get_cf.pixel = fg ;
  get_cb.pixel = bg ;

  XQueryColor(dpy, cmap, &get_cf) ;
  XQueryColor(dpy, cmap, &get_cb) ;

  return AllocGreyPixelC(w, &get_cf, &get_cb, scale) ;
}



	/* Allocate a pixel partway between foreground and background */


Pixel
AllocGreyPixelC(Widget w, XColor *fg, XColor *bg, int scale)
{
  XColor	set_c ;
  Display	*dpy = XtDisplay(w) ;
  int		r,g,b ;
  Colormap	cmap = w->core.colormap ;

  r = (fg->red * scale +   bg->red * (100-scale)) / 100 ;
  g = (fg->green * scale + bg->green * (100-scale)) / 100 ;
  b = (fg->blue * scale +  bg->blue * (100-scale)) / 100 ;

  if( scale > 100 || scale < 0 )	/* look out for overflow */
  {
    int minc, maxc ;
    maxc = Max(r, Max(g,b)) ;
    minc = Min(r, Min(g,b)) ;
    if( maxc > 65535 )
    {
      maxc /= 16 ;
      r = r*(65535/16) / maxc ;
      g = g*(65535/16) / maxc ;
      b = b*(65535/16) / maxc ;
    }
    if( minc < 0 )
    {
      r = Max(r,0) ;
      g = Max(g,0) ;
      b = Max(b,0) ;
    }
  }

  set_c.red = r ; set_c.green = g ; set_c.blue = b ;
  set_c.flags = DoRed | DoGreen | DoBlue ;
  (void)XAllocColor(dpy, cmap, &set_c) ;
  return set_c.pixel ;
}





	/* draw a 3-d box */

void
Draw3dBox(Widget w, int x, int y, int wid, int hgt, int s, GC topgc, GC botgc)
{
	Display		*dpy = XtDisplay(w) ;
	Window		win = XtWindow(w) ;

	if( s == 0 ) return ;

	if( s == 1 ) {
	  XDrawLine(dpy,win,botgc, x,y+hgt-1, x+wid-1,y+hgt-1) ;
	  XDrawLine(dpy,win,botgc, x+wid-1,y, x+wid-1,y+hgt-1) ;
	  XDrawLine(dpy,win,topgc, x,y, x,y+hgt-1) ;
	  XDrawLine(dpy,win,topgc, x,y, x+wid-1,y) ;
	}
	else
	{
	  XPoint pts[6] ;

	  /* bottom-right shadow */
	  pts[0].x = x ;	pts[0].y = y + hgt ;
	  pts[1].x = s ;	pts[1].y = -s ;
	  pts[2].x = wid-2*s ;	pts[2].y = 0 ;
	  pts[3].x = 0 ;	pts[3].y = -(hgt-2*s) ;
	  pts[4].x = s ;	pts[4].y = -s ;
	  pts[5].x = 0 ;	pts[5].y = hgt ;
	  XFillPolygon(dpy,win,botgc, pts,6, Nonconvex,CoordModePrevious) ;

	  /* top-left shadow */
	  pts[0].x = x ;	pts[0].y = y ;
	  pts[1].x = wid ;	pts[1].y = 0 ;
	  pts[2].x = -s ;	pts[2].y = s ;
	  pts[3].x = -wid+2*s ;	pts[3].y = 0 ;
	  pts[4].x = 0 ;	pts[4].y = hgt-2*s ;
	  pts[5].x = -s ;	pts[5].y = s ;
	  XFillPolygon(dpy,win,topgc, pts,6, Nonconvex,CoordModePrevious) ;
	}
}

#if XtSpecificationRelease < 5

static	GC
XtAllocateGC(Widget w, int depth, unsigned long mask, XGCValues *values,
	     unsigned long dynamic, unsigned long dontcare)
{
	return XtGetGC(w, mask, values) ;
}
#endif


static	unsigned char screen0[2] = {0,0} ;
static	unsigned char screen25[2] = {0,0xaa} ;
static	unsigned char screen75[2] = {0xaa,0xff} ;
static	unsigned char screen100[2] = {0xff,0xff} ;

static	Pixmap
getDitherPixmap(Widget w, int contrast)
{
	Display	*dpy = XtDisplay(w) ;
	Window	win = XtWindow(w) ;

	if( contrast <= 5 )
	  return XCreateBitmapFromData(dpy,win, (char *)screen0, 2,2) ;
	else if( contrast <= 37 )
	  return XCreateBitmapFromData(dpy,win, (char *)screen25, 2,2) ;
	else if( contrast <= 62 )
	  return XmuCreateStippledPixmap(XtScreen(w), 1L, 0L, 1) ;
	else if( contrast <= 95 )
	  return XCreateBitmapFromData(dpy,win, (char *)screen75, 2,2) ;
	else
	  return XCreateBitmapFromData(dpy,win, (char *)screen100, 2,2) ;
}