rxvt-unicode/src/rxvttoolkit.C

/*--------------------------------*-C-*---------------------------------*
 * File:        rxvttoolkit.C
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 2003-2004 Marc Lehmann <pcg@goof.com>
 *
 * 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 of the License, 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------*/

#include "../config.h"
#include <rxvt.h>
#include <rxvttoolkit.h>

#include <unistd.h>
#include <fcntl.h>

#ifndef NO_SLOW_LINK_SUPPORT
# include <sys/socket.h>
# include <sys/un.h>
#endif

refcounted::refcounted (const char *id)
{
  this->id = strdup (id);
}

refcounted::~refcounted ()
{
  free (id);
}

template<class T>
T *refcache<T>::get (const char *id)
{
  for (T **i = this->begin (); i < this->end (); ++i)
    {
      if (!strcmp (id, (*i)->id))
        {
          (*i)->referenced++;
          return *i;
        }
    }

  T *obj = new T (id);

  obj->referenced = 1;

  if (obj && obj->init ())
    {
      this->push_back (obj);
      return obj;
    }
  else
    {
      delete obj;
      return 0;
    }
}

template<class T>
void refcache<T>::put (T *obj)
{
  if (!obj)
    return;

  if (!--obj->referenced)
    {
      this->erase (find (this->begin (), this->end (), obj));
      delete obj;
    }
}

template<class T>
void refcache<T>::clear ()
{
  while (this->size ())
    put (*this->begin ());
}

/////////////////////////////////////////////////////////////////////////////

#ifdef USE_XIM
static void
#if XIMCB_PROTO_BROKEN
im_destroy_cb (XIC unused1, XPointer client_data, XPointer unused3)
#else
im_destroy_cb (XIM unused1, XPointer client_data, XPointer unused3)
#endif
{
  rxvt_xim *xim = (rxvt_xim *)client_data;
  rxvt_display *display = xim->display;

  xim->xim = 0;

  display->xims.erase (find (display->xims.begin (), display->xims.end (), xim));
  display->im_change_cb ();
}

bool rxvt_xim::init ()
{
  display = GET_R->display; //HACK: TODO

  xim = XOpenIM (display->display, NULL, NULL, NULL);

  if (!xim)
    return false;

  XIMCallback ximcallback;
  ximcallback.client_data = (XPointer)this;
  ximcallback.callback = im_destroy_cb;

  XSetIMValues (xim, XNDestroyCallback, &ximcallback, NULL);

  return true;
}

rxvt_xim::~rxvt_xim ()
{
  if (xim)
    XCloseIM (xim);
}
#endif

/////////////////////////////////////////////////////////////////////////////

rxvt_display::rxvt_display (const char *id)
: refcounted (id)
, x_ev (this, &rxvt_display::x_cb)
, selection_owner (0)
{
}

bool rxvt_display::init ()
{
#ifdef LOCAL_X_IS_UNIX
  if (id[0] == ':')
    {
      val = rxvt_malloc (5 + strlen (id) + 1);
      strcpy (val, "unix/");
      strcat (val, id);
      display = XOpenDisplay (val);
      free (val);
    }
  else
#endif
    display = 0;

  if (!display)
    display = XOpenDisplay (id);

  if (!display)
    return false;

  screen = DefaultScreen (display);
  root   = DefaultRootWindow (display);
  visual = DefaultVisual (display, screen);
  cmap   = DefaultColormap (display, screen);
  depth  = DefaultDepth (display, screen);

  int fd = XConnectionNumber (display);

#ifndef NO_SLOW_LINK_SUPPORT
  // try to detect wether we have a local connection.
  // assume unix domains socket == local, everything else not
  // TODO: might want to check for inet/127.0.0.1
  is_local = 0;
  sockaddr_un sa;
  socklen_t sl = sizeof (sa);

  if (!getsockname (fd, (sockaddr *)&sa, &sl))
    is_local = sa.sun_family == AF_LOCAL;
#endif

#ifdef POINTER_BLANK
  XColor blackcolour;
  blackcolour.red   = 0;
  blackcolour.green = 0;
  blackcolour.blue  = 0;
  Font f = XLoadFont (display, "fixed");
  blank_cursor = XCreateGlyphCursor (display, f, f, ' ', ' ',
                                     &blackcolour, &blackcolour);
  XUnloadFont (display, f);
#endif

#ifdef PREFER_24BIT
  /*
   * If depth is not 24, look for a 24bit visual.
   */
  if (depth != 24)
    {
      XVisualInfo vinfo;

      if (XMatchVisualInfo (display, screen, 24, TrueColor, &vinfo))
        {
          depth = 24;
          visual = vinfo.visual;
          cmap = XCreateColormap (display,
                                  RootWindow (display, screen),
                                  visual, AllocNone);
        }
    }
#endif

  x_ev.start (fd, EVENT_READ);
  fcntl (fd, F_SETFD, FD_CLOEXEC);

  XSelectInput (display, root, PropertyChangeMask);
#ifdef USE_XIM
  xa_xim_servers = XInternAtom (display, "XIM_SERVERS", 0);
#endif

  flush ();

  return true;
}

rxvt_display::~rxvt_display ()
{
  if (!display)
    return;

#ifdef POINTER_BLANK
  XFreeCursor (display, blank_cursor);
#endif
  x_ev.stop ();
#ifdef USE_XIM
  xims.clear ();
#endif
  XCloseDisplay (display);
}

#ifdef USE_XIM
void rxvt_display::im_change_cb ()
{
  for (im_watcher **i = imw.begin (); i != imw.end (); ++i)
    (*i)->call ();
}

void rxvt_display::im_change_check ()
{
  // try to only call im_change_cb when a new input method
  // registers, as xlib crashes due to a race otherwise.
  Atom actual_type, *atoms;
  int actual_format;
  unsigned long nitems, bytes_after;

  if (XGetWindowProperty (display, root, xa_xim_servers, 0L, 1000000L,
                          False, XA_ATOM, &actual_type, &actual_format,
                          &nitems, &bytes_after, (unsigned char **)&atoms)
      != Success )
    return;

  if (actual_type == XA_ATOM  && actual_format == 32)
    for (int i = 0; i < nitems; i++)
      if (XGetSelectionOwner (display, atoms[i]))
        {
          im_change_cb ();
          break;
        }

  XFree (atoms);
}
#endif

void rxvt_display::x_cb (io_watcher &w, short revents)
{
  do
    {
      XEvent xev;
      XNextEvent (display, &xev);

#ifdef USE_XIM
      if (!XFilterEvent (&xev, None))
        {
          if (xev.type == PropertyNotify
              && xev.xany.window == root
              && xev.xproperty.atom == xa_xim_servers)
            im_change_check ();
#endif
          for (int i = xw.size (); i--; )
            {
              if (!xw[i])
                xw.erase_unordered (i);
              else if (xw[i]->window == xev.xany.window)
                xw[i]->call (xev);
            }
#ifdef USE_XIM
        }
#endif
    }
  while (XEventsQueued (display, QueuedAlready));

  XFlush (display);
}

void rxvt_display::flush ()
{
  if (XEventsQueued (display, QueuedAlready))
    x_cb (x_ev, EVENT_READ);

  XFlush (display);
}

void rxvt_display::reg (xevent_watcher *w)
{
  xw.push_back (w);
  w->active = xw.size ();
}

void rxvt_display::unreg (xevent_watcher *w)
{
  if (w->active)
    xw[w->active - 1] = 0;
}

void rxvt_display::set_selection_owner (rxvt_term *owner)
{
  if (selection_owner && selection_owner != owner)
    selection_owner->selection_clear ();

  selection_owner = owner;
}

#ifdef USE_XIM
void rxvt_display::reg (im_watcher *w)
{
  imw.push_back (w);
}

void rxvt_display::unreg (im_watcher *w)
{
  imw.erase (find (imw.begin (), imw.end (), w));
}

rxvt_xim *rxvt_display::get_xim (const char *locale, const char *modifiers)
{
  char *id;
  int l, m;

  l = strlen (locale);
  m = strlen (modifiers);

  if (!(id = (char *)malloc (l + m + 2)))
    return 0;

  memcpy (id, locale, l); id[l] = '\n';
  memcpy (id + l + 1, modifiers, m); id[l + m + 1] = 0;

  rxvt_xim *xim = xims.get (id);

  free (id);

  return xim;
}

void rxvt_display::put_xim (rxvt_xim *xim)
{
#if XLIB_IS_RACEFREE
  xims.put (xim);
#endif
}
#endif

Atom rxvt_display::atom (const char *name)
{
  return XInternAtom (display, name, False);
}

/////////////////////////////////////////////////////////////////////////////

template class refcache<rxvt_display>;
refcache<rxvt_display> displays;

/////////////////////////////////////////////////////////////////////////////
  
bool
rxvt_color::set (rxvt_display *display, Pixel p)
{
#if XFT
  XColor xc;

  xc.pixel = p;
  if (!XQueryColor (display->display, display->cmap, &xc))
    return false;

  XRenderColor d;

  d.red   = xc.red;
  d.green = xc.green;
  d.blue  = xc.blue;
  d.alpha = 0xffff;

  return
    XftColorAllocValue (display->display, 
                        display->visual,
                        display->cmap,
                        &d, &c);
#else
  this->p = p;
#endif

  return true;
}

bool
rxvt_color::set (rxvt_display *display, const char *name)
{
#if XFT
  return XftColorAllocName (display->display, display->visual, display->cmap,
                            name, &c);
#else
  XColor xc;

  if (XParseColor (display->display, display->cmap, name, &xc))
    return set (display, xc.red, xc.green, xc.blue);

  return false;
#endif
}

bool
rxvt_color::set (rxvt_display *display, unsigned short cr, unsigned short cg, unsigned short cb)
{
  XColor xc;

  xc.red   = cr;
  xc.green = cg;
  xc.blue  = cb;
  xc.flags = DoRed | DoGreen | DoBlue;

  if (XAllocColor (display->display, display->cmap, &xc))
    return set (display, xc.pixel);

  return false;
}

void 
rxvt_color::get (rxvt_display *display, unsigned short &cr, unsigned short &cg, unsigned short &cb)
{
#if XFT
  cr = c.color.red;
  cg = c.color.green;
  cb = c.color.blue;
#else
  XColor c;

  c.pixel = p;
  XQueryColor (display->display, display->cmap, &c);

  cr = c.red;
  cg = c.green;
  cb = c.blue;
#endif
}

void 
rxvt_color::free (rxvt_display *display)
{
#if XFT
  XftColorFree (display->display, display->visual, display->cmap, &c);
#else
  XFreeColors (display->display, display->cmap, &p, 1, AllPlanes);
#endif
}

rxvt_color
rxvt_color::fade (rxvt_display *display, int percent)
{
  percent = 100 - percent;

  unsigned short cr, cg, cb;
  rxvt_color faded;

  get (display, cr, cg, cb);

  faded.set (
    display,
    cr * percent / 100,
    cg * percent / 100,
    cb * percent / 100
  );

  return faded;
}

#define LERP(a,b,p) (a * p + b * (100 - p)) / 100

rxvt_color
rxvt_color::fade (rxvt_display *display, int percent, rxvt_color &fadeto)
{
  percent = 100 - percent;

  unsigned short cr, cg, cb;
  unsigned short fcr, fcg, fcb;
  rxvt_color faded;
  
  get (display, cr, cg, cb);
  fadeto.get(display, fcr, fcg, fcb);

  faded.set (
    display,
    LERP (cr, fcr, percent),
    LERP (cg, fcg, percent),
    LERP (cb, fcb, percent)
  );

  return faded;
}

Revision:	1.22
Committed:	Mon Jan 9 05:08:02 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.21:	+4 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/---------------------------------C----------------------------------
2	root	1.5	* File: rxvttoolkit.C
3	root	1.1	----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 2003-2004 Marc Lehmann <pcg@goof.com>
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			----------------------------------------------------------------------/
22
23			#include "../config.h"
24			#include <rxvt.h>
25			#include <rxvttoolkit.h>
26
27			#include <unistd.h>
28			#include <fcntl.h>
29
30			#ifndef NO_SLOW_LINK_SUPPORT
31			# include <sys/socket.h>
32			# include <sys/un.h>
33			#endif
34
35			refcounted::refcounted (const char *id)
36			{
37	root	1.2	this->id = strdup (id);
38	root	1.1	}
39
40			refcounted::~refcounted ()
41			{
42			free (id);
43			}
44
45			template<class T>
46			T refcache<T>::get (const char id)
47			{
48			for (T **i = this->begin (); i < this->end (); ++i)
49			{
50			if (!strcmp (id, (*i)->id))
51			{
52			(*i)->referenced++;
53			return *i;
54			}
55			}
56
57			T *obj = new T (id);
58
59			obj->referenced = 1;
60
61			if (obj && obj->init ())
62			{
63			this->push_back (obj);
64			return obj;
65			}
66			else
67			{
68			delete obj;
69			return 0;
70			}
71			}
72
73			template<class T>
74			void refcache<T>::put (T *obj)
75			{
76			if (!obj)
77			return;
78
79			if (!--obj->referenced)
80			{
81			this->erase (find (this->begin (), this->end (), obj));
82			delete obj;
83			}
84			}
85
86			template<class T>
87	root	1.12	void refcache<T>::clear ()
88	root	1.1	{
89			while (this->size ())
90			put (*this->begin ());
91			}
92
93			/////////////////////////////////////////////////////////////////////////////
94
95			#ifdef USE_XIM
96			static void
97			#if XIMCB_PROTO_BROKEN
98			im_destroy_cb (XIC unused1, XPointer client_data, XPointer unused3)
99			#else
100			im_destroy_cb (XIM unused1, XPointer client_data, XPointer unused3)
101			#endif
102			{
103			rxvt_xim xim = (rxvt_xim )client_data;
104			rxvt_display *display = xim->display;
105
106	root	1.5	xim->xim = 0;
107
108	root	1.1	display->xims.erase (find (display->xims.begin (), display->xims.end (), xim));
109			display->im_change_cb ();
110			}
111
112			bool rxvt_xim::init ()
113			{
114			display = GET_R->display; //HACK: TODO
115
116			xim = XOpenIM (display->display, NULL, NULL, NULL);
117
118			if (!xim)
119			return false;
120
121			XIMCallback ximcallback;
122			ximcallback.client_data = (XPointer)this;
123			ximcallback.callback = im_destroy_cb;
124
125			XSetIMValues (xim, XNDestroyCallback, &ximcallback, NULL);
126
127			return true;
128			}
129
130			rxvt_xim::~rxvt_xim ()
131			{
132			if (xim)
133			XCloseIM (xim);
134			}
135			#endif
136
137			/////////////////////////////////////////////////////////////////////////////
138
139			rxvt_display::rxvt_display (const char *id)
140			: refcounted (id)
141			, x_ev (this, &rxvt_display::x_cb)
142			, selection_owner (0)
143			{
144			}
145
146			bool rxvt_display::init ()
147			{
148	root	1.14	#ifdef LOCAL_X_IS_UNIX
149			if (id[0] == ':')
150			{
151			val = rxvt_malloc (5 + strlen (id) + 1);
152			strcpy (val, "unix/");
153			strcat (val, id);
154			display = XOpenDisplay (val);
155			free (val);
156			}
157			else
158	root	1.15	#endif
159	root	1.14	display = 0;
160
161			if (!display)
162			display = XOpenDisplay (id);
163	root	1.1
164			if (!display)
165			return false;
166
167			screen = DefaultScreen (display);
168			root = DefaultRootWindow (display);
169			visual = DefaultVisual (display, screen);
170			cmap = DefaultColormap (display, screen);
171			depth = DefaultDepth (display, screen);
172
173			int fd = XConnectionNumber (display);
174
175			#ifndef NO_SLOW_LINK_SUPPORT
176	root	1.17	// try to detect wether we have a local connection.
177	root	1.1	// assume unix domains socket == local, everything else not
178			// TODO: might want to check for inet/127.0.0.1
179			is_local = 0;
180			sockaddr_un sa;
181			socklen_t sl = sizeof (sa);
182
183			if (!getsockname (fd, (sockaddr *)&sa, &sl))
184			is_local = sa.sun_family == AF_LOCAL;
185			#endif
186
187	root	1.12	#ifdef POINTER_BLANK
188			XColor blackcolour;
189			blackcolour.red = 0;
190			blackcolour.green = 0;
191			blackcolour.blue = 0;
192			Font f = XLoadFont (display, "fixed");
193			blank_cursor = XCreateGlyphCursor (display, f, f, ' ', ' ',
194			&blackcolour, &blackcolour);
195			XUnloadFont (display, f);
196			#endif
197
198	root	1.1	#ifdef PREFER_24BIT
199			/*
200			* If depth is not 24, look for a 24bit visual.
201			*/
202			if (depth != 24)
203			{
204			XVisualInfo vinfo;
205
206			if (XMatchVisualInfo (display, screen, 24, TrueColor, &vinfo))
207			{
208			depth = 24;
209			visual = vinfo.visual;
210			cmap = XCreateColormap (display,
211			RootWindow (display, screen),
212			visual, AllocNone);
213			}
214			}
215			#endif
216
217			x_ev.start (fd, EVENT_READ);
218			fcntl (fd, F_SETFD, FD_CLOEXEC);
219
220			XSelectInput (display, root, PropertyChangeMask);
221			#ifdef USE_XIM
222			xa_xim_servers = XInternAtom (display, "XIM_SERVERS", 0);
223			#endif
224
225			flush ();
226
227			return true;
228			}
229
230			rxvt_display::~rxvt_display ()
231			{
232	root	1.22	if (!display)
233			return;
234
235	root	1.21	#ifdef POINTER_BLANK
236			XFreeCursor (display, blank_cursor);
237			#endif
238	root	1.1	x_ev.stop ();
239	root	1.12	#ifdef USE_XIM
240			xims.clear ();
241			#endif
242	root	1.22	XCloseDisplay (display);
243	root	1.1	}
244
245			#ifdef USE_XIM
246			void rxvt_display::im_change_cb ()
247			{
248			for (im_watcher **i = imw.begin (); i != imw.end (); ++i)
249			(*i)->call ();
250			}
251	root	1.5
252			void rxvt_display::im_change_check ()
253			{
254	root	1.13	// try to only call im_change_cb when a new input method
255	root	1.5	// registers, as xlib crashes due to a race otherwise.
256			Atom actual_type, *atoms;
257			int actual_format;
258			unsigned long nitems, bytes_after;
259
260			if (XGetWindowProperty (display, root, xa_xim_servers, 0L, 1000000L,
261			False, XA_ATOM, &actual_type, &actual_format,
262			&nitems, &bytes_after, (unsigned char **)&atoms)
263			!= Success )
264			return;
265
266			if (actual_type == XA_ATOM && actual_format == 32)
267			for (int i = 0; i < nitems; i++)
268			if (XGetSelectionOwner (display, atoms[i]))
269			{
270			im_change_cb ();
271			break;
272			}
273
274			XFree (atoms);
275			}
276	root	1.1	#endif
277
278			void rxvt_display::x_cb (io_watcher &w, short revents)
279			{
280			do
281			{
282			XEvent xev;
283			XNextEvent (display, &xev);
284
285	root	1.5	#ifdef USE_XIM
286			if (!XFilterEvent (&xev, None))
287			{
288			if (xev.type == PropertyNotify
289			&& xev.xany.window == root
290			&& xev.xproperty.atom == xa_xim_servers)
291			im_change_check ();
292			#endif
293			for (int i = xw.size (); i--; )
294			{
295			if (!xw[i])
296			xw.erase_unordered (i);
297			else if (xw[i]->window == xev.xany.window)
298			xw[i]->call (xev);
299			}
300	root	1.1	#ifdef USE_XIM
301	root	1.5	}
302	root	1.1	#endif
303			}
304	root	1.6	while (XEventsQueued (display, QueuedAlready));
305	root	1.1
306	root	1.10	XFlush (display);
307	root	1.1	}
308
309			void rxvt_display::flush ()
310			{
311	root	1.10	if (XEventsQueued (display, QueuedAlready))
312			x_cb (x_ev, EVENT_READ);
313
314	root	1.8	XFlush (display);
315	root	1.1	}
316
317			void rxvt_display::reg (xevent_watcher *w)
318			{
319			xw.push_back (w);
320			w->active = xw.size ();
321			}
322
323			void rxvt_display::unreg (xevent_watcher *w)
324			{
325			if (w->active)
326			xw[w->active - 1] = 0;
327			}
328
329			void rxvt_display::set_selection_owner (rxvt_term *owner)
330			{
331			if (selection_owner && selection_owner != owner)
332			selection_owner->selection_clear ();
333
334			selection_owner = owner;
335			}
336
337			#ifdef USE_XIM
338			void rxvt_display::reg (im_watcher *w)
339			{
340			imw.push_back (w);
341			}
342
343			void rxvt_display::unreg (im_watcher *w)
344			{
345			imw.erase (find (imw.begin (), imw.end (), w));
346			}
347
348			rxvt_xim rxvt_display::get_xim (const char locale, const char *modifiers)
349			{
350			char *id;
351			int l, m;
352
353			l = strlen (locale);
354			m = strlen (modifiers);
355
356			if (!(id = (char *)malloc (l + m + 2)))
357			return 0;
358
359			memcpy (id, locale, l); id[l] = '\n';
360			memcpy (id + l + 1, modifiers, m); id[l + m + 1] = 0;
361
362			rxvt_xim *xim = xims.get (id);
363
364			free (id);
365
366			return xim;
367			}
368
369			void rxvt_display::put_xim (rxvt_xim *xim)
370			{
371	root	1.10	#if XLIB_IS_RACEFREE
372	root	1.1	xims.put (xim);
373	root	1.10	#endif
374	root	1.1	}
375			#endif
376
377			Atom rxvt_display::atom (const char *name)
378			{
379			return XInternAtom (display, name, False);
380			}
381
382			/////////////////////////////////////////////////////////////////////////////
383
384			template class refcache<rxvt_display>;
385			refcache<rxvt_display> displays;
386
387			/////////////////////////////////////////////////////////////////////////////
388
389			bool
390			rxvt_color::set (rxvt_display *display, Pixel p)
391			{
392			#if XFT
393			XColor xc;
394
395			xc.pixel = p;
396			if (!XQueryColor (display->display, display->cmap, &xc))
397			return false;
398
399			XRenderColor d;
400
401			d.red = xc.red;
402			d.green = xc.green;
403			d.blue = xc.blue;
404			d.alpha = 0xffff;
405
406			return
407			XftColorAllocValue (display->display,
408			display->visual,
409			display->cmap,
410			&d, &c);
411			#else
412			this->p = p;
413			#endif
414
415			return true;
416			}
417
418			bool
419			rxvt_color::set (rxvt_display display, const char name)
420			{
421	root	1.7	#if XFT
422			return XftColorAllocName (display->display, display->visual, display->cmap,
423			name, &c);
424			#else
425	root	1.1	XColor xc;
426
427			if (XParseColor (display->display, display->cmap, name, &xc))
428			return set (display, xc.red, xc.green, xc.blue);
429
430			return false;
431	root	1.7	#endif
432	root	1.1	}
433
434			bool
435			rxvt_color::set (rxvt_display *display, unsigned short cr, unsigned short cg, unsigned short cb)
436			{
437			XColor xc;
438
439			xc.red = cr;
440			xc.green = cg;
441			xc.blue = cb;
442			xc.flags = DoRed \| DoGreen \| DoBlue;
443
444			if (XAllocColor (display->display, display->cmap, &xc))
445			return set (display, xc.pixel);
446
447			return false;
448			}
449
450			void
451			rxvt_color::get (rxvt_display *display, unsigned short &cr, unsigned short &cg, unsigned short &cb)
452			{
453			#if XFT
454			cr = c.color.red;
455			cg = c.color.green;
456			cb = c.color.blue;
457			#else
458			XColor c;
459
460			c.pixel = p;
461			XQueryColor (display->display, display->cmap, &c);
462
463			cr = c.red;
464			cg = c.green;
465			cb = c.blue;
466			#endif
467			}
468
469			void
470			rxvt_color::free (rxvt_display *display)
471			{
472			#if XFT
473			XftColorFree (display->display, display->visual, display->cmap, &c);
474			#else
475			XFreeColors (display->display, display->cmap, &p, 1, AllPlanes);
476			#endif
477			}
478
479			rxvt_color
480			rxvt_color::fade (rxvt_display *display, int percent)
481			{
482	root	1.18	percent = 100 - percent;
483
484	root	1.1	unsigned short cr, cg, cb;
485			rxvt_color faded;
486
487			get (display, cr, cg, cb);
488	root	1.18
489			faded.set (
490			display,
491			cr * percent / 100,
492			cg * percent / 100,
493			cb * percent / 100
494			);
495
496			return faded;
497			}
498
499	root	1.19	#define LERP(a,b,p) (a * p + b * (100 - p)) / 100
500	root	1.18
501			rxvt_color
502			rxvt_color::fade (rxvt_display *display, int percent, rxvt_color &fadeto)
503			{
504			percent = 100 - percent;
505
506			unsigned short cr, cg, cb;
507			unsigned short fcr, fcg, fcb;
508			rxvt_color faded;
509
510			get (display, cr, cg, cb);
511			fadeto.get(display, fcr, fcg, fcb);
512
513			faded.set (
514			display,
515			LERP (cr, fcr, percent),
516			LERP (cg, fcg, percent),
517			LERP (cb, fcb, percent)
518			);
519	root	1.1
520			return faded;
521			}
522