rxvt-unicode/src/rxvttoolkit.C

/*----------------------------------------------------------------------*
 * File:        rxvttoolkit.C
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 2003-2007 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>

#include <sys/utsname.h>
#include <sys/socket.h>
#include <sys/un.h>

#if XFT
# include <X11/extensions/Xrender.h>
#endif

const char *const xa_names[] =
{
  "TEXT",
  "COMPOUND_TEXT",
  "UTF8_STRING",
  "MULTIPLE",
  "TARGETS",
  "TIMESTAMP",
  "VT_SELECTION",
  "INCR",
  "WM_PROTOCOLS",
  "WM_DELETE_WINDOW",
  "CLIPBOARD",
  "AVERAGE_WIDTH",
  "WEIGHT_NAME",
  "SLANT",
  "CHARSET_REGISTRY",
  "CHARSET_ENCODING",
#if ENABLE_FRILLS
  "_MOTIF_WM_HINTS",
#endif
#if ENABLE_EWMH
  "_NET_WM_PID",
  "_NET_WM_NAME",
  "_NET_WM_ICON_NAME",
  "_NET_WM_PING",
#endif
#if USE_XIM
  "WM_LOCALE_NAME",
  "XIM_SERVERS",
#endif
#ifdef ENABLE_TRANSPARENCY
  "_XROOTPMAP_ID",
  "ESETROOT_PMAP_ID",
#endif
#if ENABLE_XEMBED
  "_XEMBED",
  "_XEMBED_INFO",
#endif
#if !ENABLE_MINIMAL
  "SCREEN_RESOURCES",
  "XDCCC_LINEAR_RGB_CORRECTION",
  "XDCCC_LINEAR_RGB_MATRICES",
  "WM_COLORMAP_WINDOWS",
  "WM_STATE",
  "cursor",
# if USE_XIM
  "TRANSPORT",
  "LOCALES",
  "_XIM_PROTOCOL",
  "_XIM_XCONNECT",
  "_XIM_MOREDATA",
# endif
#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;
          (*i)->ref_next ();
          return *i;
        }
    }

  T *obj = new T (id);

  if (obj && obj->ref_init ())
    {
      obj->referenced = 1;
      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::ref_init ()
{
  display = GET_R->display; //HACK: TODO

  xim = XOpenIM (display->dpy, 0, 0, 0);

  if (!xim)
    return false;

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

  XSetIMValues (xim, XNDestroyCallback, &ximcallback, (char *)0);

  return true;
}

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

#endif

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

#if XFT
rxvt_drawable::~rxvt_drawable ()
{
  if (xftdrawable)
    XftDrawDestroy (xftdrawable);
}

rxvt_drawable::operator XftDraw *()
{
  if (!xftdrawable)
    xftdrawable = XftDrawCreate (screen->dpy, drawable, screen->visual, screen->cmap);

  return xftdrawable;
}
#endif

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

#if XFT

// not strictly necessary as it is only used with superclass of zero_initialised
rxvt_screen::rxvt_screen ()
: scratch_area (0)
{
}

rxvt_drawable &rxvt_screen::scratch_drawable (int w, int h)
{
  // it's actually faster to re-allocate every time. don't ask me
  // why, but its likely no big deal there are no roundtrips
  // (I think/hope).
  if (!scratch_area || w > scratch_w || h > scratch_h || 1/*D*/)
    {
      if (scratch_area)
        {
          XFreePixmap (dpy, scratch_area->drawable);
          delete scratch_area;
        }

      Pixmap pm = XCreatePixmap (dpy, RootWindowOfScreen (ScreenOfDisplay (dpy, display->screen)),
                                 scratch_w = w, scratch_h = h, depth);

      scratch_area = new rxvt_drawable (this, pm);
    }

  return *scratch_area;
}

#endif

void
rxvt_screen::set (rxvt_display *disp)
{
  display = disp;
  dpy     = disp->dpy;

  Screen *screen = ScreenOfDisplay (dpy, disp->screen);

  depth   = DefaultDepthOfScreen    (screen);
  visual  = DefaultVisualOfScreen   (screen);
  cmap    = DefaultColormapOfScreen (screen);
}

void
rxvt_screen::select_visual (int bitdepth)
{
#if XFT
  XVisualInfo vinfo;

  if (XMatchVisualInfo (dpy, display->screen, bitdepth, TrueColor, &vinfo))
    {
      depth  = bitdepth;
      visual = vinfo.visual;
      cmap   = XCreateColormap (dpy, display->root, visual, AllocNone);
    }
#endif
}

void
rxvt_screen::clear ()
{
#if XFT
  if (scratch_area)
    {
      XFreePixmap (dpy, scratch_area->drawable);
      delete scratch_area;
    }
#endif

  if (cmap != DefaultColormapOfScreen (ScreenOfDisplay (dpy, display->screen)))
    XFreeColormap (dpy, cmap);
}

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

rxvt_display::rxvt_display (const char *id)
: refcounted (id)
, selection_owner (0)
{
  x_ev    .set<rxvt_display, &rxvt_display::x_cb    > (this);
  flush_ev.set<rxvt_display, &rxvt_display::flush_cb> (this);
}

XrmDatabase
rxvt_display::get_resources (bool refresh)
{
  char *homedir = getenv ("HOME");
  char fname[1024];

  /*
   * get resources using the X library function
   */
  char *displayResource, *xe;
  XrmDatabase rdb1, database = 0;

  // for ordering, see for example http://www.faqs.org/faqs/Xt-FAQ/ Subject: 20
  // as opposed to "standard practise", we always read in ~/.Xdefaults

  // 6. System wide per application default file.

  /* Add in $XAPPLRESDIR/Rxvt only; not bothering with XUSERFILESEARCHPATH */
  if ((xe = getenv ("XAPPLRESDIR")))
    {
      snprintf (fname, sizeof (fname), "%s/%s", xe, RESCLASS);

      if ((rdb1 = XrmGetFileDatabase (fname)))
        XrmMergeDatabases (rdb1, &database);
    }

  // 5. User's per application default file.
  // none

  // 4. User's defaults file.
  if (homedir)
    {
      snprintf (fname, sizeof (fname), "%s/.Xdefaults", homedir);

      if ((rdb1 = XrmGetFileDatabase (fname)))
        XrmMergeDatabases (rdb1, &database);
    }

  /* Get any Xserver defaults */
  if (refresh)
    {
      // fucking xlib keeps a copy of the rm string
      Atom actual_type;
      int actual_format;
      unsigned long nitems, nremaining;
      char *val = 0;

#if XLIB_ILLEGAL_ACCESS
      if (dpy->xdefaults)
        XFree (dpy->xdefaults);
#endif

      if (XGetWindowProperty (dpy, RootWindow (dpy, 0), XA_RESOURCE_MANAGER,
                              0L, 100000000L, False,
                              XA_STRING, &actual_type, &actual_format,
                              &nitems, &nremaining,
                              (unsigned char **)&val) == Success
          && actual_type == XA_STRING
          && actual_format == 8)
         displayResource = val;
       else
         {
           displayResource = 0;

           if (val)
             XFree(val);
         }

#if XLIB_ILLEGAL_ACCESS
      dpy->xdefaults = displayResource;
#endif
    }
  else
    displayResource = XResourceManagerString (dpy);

  if (displayResource)
    {
      if ((rdb1 = XrmGetStringDatabase (displayResource)))
        XrmMergeDatabases (rdb1, &database);
    }

#if !XLIB_ILLEGAL_ACCESS
  if (refresh && displayResource)
    XFree (displayResource);
#endif

  /* Get screen specific resources */
  displayResource = XScreenResourceString (ScreenOfDisplay (dpy, screen));

  if (displayResource)
    {
      if ((rdb1 = XrmGetStringDatabase (displayResource)))
        /* Merge with screen-independent resources */
        XrmMergeDatabases (rdb1, &database);

      XFree (displayResource);
    }

  // 3. User's per host defaults file
  /* Add in XENVIRONMENT file */
  if ((xe = getenv ("XENVIRONMENT"))
      && (rdb1 = XrmGetFileDatabase (xe)))
    XrmMergeDatabases (rdb1, &database);
  else if (homedir)
    {
      struct utsname un;

      if (!uname (&un))
        {
          snprintf (fname, sizeof (fname), "%s/.Xdefaults-%s", homedir, un.nodename);

          if ((rdb1 = XrmGetFileDatabase (fname)))
            XrmMergeDatabases (rdb1, &database);
        }
    }

  return database;
}

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

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

  if (!dpy)
    return false;

  screen = DefaultScreen     (dpy);
  root   = DefaultRootWindow (dpy);

  assert (sizeof (xa_names) / sizeof (char *) == NUM_XA);
  XInternAtoms (dpy, (char **)xa_names, NUM_XA, False, xa);

  XrmSetDatabase (dpy, get_resources (false));

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

  int fd = XConnectionNumber (dpy);

  // try to detect wether we have a local connection.
  // assume unix domain 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_UNIX;

  flush_ev.start ();
  x_ev.start (fd, ev::READ);
  fcntl (fd, F_SETFD, FD_CLOEXEC);

  XSelectInput (dpy, root, PropertyChangeMask);

  flush ();

  return true;
}

void
rxvt_display::ref_next ()
{
  // TODO: somehow check wether the database files/resources changed
  // before affording re-loading/parsing
  XrmDestroyDatabase (XrmGetDatabase (dpy));
  XrmSetDatabase (dpy, get_resources (true));
}

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

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

#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 (dpy, root, xa[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 (dpy, atoms[i]))
        {
          im_change_cb ();
          break;
        }

  XFree (atoms);
}
#endif

void rxvt_display::x_cb (ev::io &w, int revents)
{
  while (XEventsQueued (dpy, QueuedAfterReading))
    {
      XEvent xev;
      XNextEvent (dpy, &xev);

      flush_ev.start ();

#ifdef USE_XIM
      if (!XFilterEvent (&xev, None))
#endif
        {
          if (xev.type == PropertyNotify
              && xev.xany.window == root
              && xev.xproperty.atom == xa[XA_XIM_SERVERS])
            im_change_check ();
          if (xev.type == MappingNotify)
            XRefreshKeyboardMapping (&xev.xmapping);

          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);
            }
        }
    }

  XFlush (dpy);
}

void rxvt_display::flush_cb (ev::idle &w, int revents)
{
  XFlush (dpy);
}

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

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

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

      owner->selection_clear ();
      owner->flush ();
    }

  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 (dpy, name, False);
}

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

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

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

static unsigned int
insert_component (unsigned int value, unsigned int mask, unsigned int shift)
{
  return (value * (mask + 1) >> 16) << shift;
}

bool
rxvt_color::alloc (rxvt_screen *screen, const rgba &color)
{
  //TODO: only supports 24 bit
  int alpha = color.a >= 0xff00 ? 0xffff : color.a;

#if XFT
  XRenderPictFormat *format;

  // FUCKING Xft gets it wrong, of course, so work around it.
  // Transparency users should eat shit and die, and then
  // XRenderQueryPictIndexValues themselves plenty.
  if ((screen->visual->c_class == TrueColor)
      && (format = XRenderFindVisualFormat (screen->dpy, screen->visual)))
    {
      // the fun lies in doing everything manually...
      c.color.red   = color.r;
      c.color.green = color.g;
      c.color.blue  = color.b;
      c.color.alpha = alpha;

      c.pixel = insert_component (color.r, format->direct.redMask  , format->direct.red  )
              | insert_component (color.g, format->direct.greenMask, format->direct.green)
              | insert_component (color.b, format->direct.blueMask , format->direct.blue )
              | insert_component (alpha  , format->direct.alphaMask, format->direct.alpha);

      return true;
    }
  else
    {
      XRenderColor d;

      d.red   = color.r;
      d.green = color.g;
      d.blue  = color.b;
      d.alpha = alpha;

      return XftColorAllocValue (screen->dpy, screen->visual, screen->cmap, &d, &c);
    }
#else
  c.red   = color.r;
  c.green = color.g;
  c.blue  = color.b;

  if (screen->visual->c_class == TrueColor)
    {
      c.pixel = (color.r >> (16 - popcount (screen->visual->red_mask  )) << ctz (screen->visual->red_mask  ))
              | (color.g >> (16 - popcount (screen->visual->green_mask)) << ctz (screen->visual->green_mask))
              | (color.b >> (16 - popcount (screen->visual->blue_mask )) << ctz (screen->visual->blue_mask ));

      return true;
    }
  else if (XAllocColor (screen->dpy, screen->cmap, &c))
    return true;
  else
    c.pixel = (color.r + color.g + color.b) > 128*3
            ? WhitePixelOfScreen (DefaultScreenOfDisplay (screen->dpy))
            : BlackPixelOfScreen (DefaultScreenOfDisplay (screen->dpy));
#endif

  return false;
}

bool
rxvt_color::set (rxvt_screen *screen, const char *name)
{
  rgba c;
  char eos;
  int skip;

  c.a = rgba::MAX_CC;

  // parse the nonstandard "[alphapercent]" prefix
  if (1 <= sscanf (name, "[%hd]%n", &c.a, &skip))
    {
      c.a = lerp<int, int, int> (0, rgba::MAX_CC, c.a);
      name += skip;
    }

  // parse the non-standard "rgba:rrrr/gggg/bbbb/aaaa" format
  if (strlen (name) != 4+5*4 || 4 != sscanf (name, "rgba:%4hx/%4hx/%4hx/%4hx%c", &c.r, &c.g, &c.b, &c.a, &eos))
    {
      XColor xc;

      if (XParseColor (screen->dpy, screen->cmap, name, &xc))
        {
          c.r = xc.red;
          c.g = xc.green;
          c.b = xc.blue;
        }
      else
        {
          c.r = 0xffff;
          c.g = 0x6969;
          c.b = 0xb4b4;

          rxvt_warn ("unable to parse color '%s', using pink instead.\n", name);
        }
    }

  return set (screen, c);
}

bool
rxvt_color::set (rxvt_screen *screen, const rgba &color)
{
  bool got = alloc (screen, color);

#if !ENABLE_MINIMAL
  int cmap_size = screen->visual->map_entries;

  if (!got
      && screen->visual->c_class == PseudoColor
      && cmap_size < 4096)
    {
      XColor *colors = new XColor [screen->visual->map_entries];

      for (int i = 0; i < cmap_size; i++)
        colors [i].pixel = i;

      // many kilobytes transfer per colour, but pseudocolor isn't worth
      // many extra optimisations.
      XQueryColors (screen->dpy, screen->cmap, colors, cmap_size);

      int diff = 0x7fffffffUL;
      XColor *best = colors;

      for (int i = 0; i < cmap_size; i++)
        {
          int d = (squared_diff<int> (color.r >> 2, colors [i].red   >> 2))
                + (squared_diff<int> (color.g >> 2, colors [i].green >> 2))
                + (squared_diff<int> (color.b >> 2, colors [i].blue  >> 2));

          if (d < diff)
            {
              diff = d;
              best = colors + i;
            }
        }

      //rxvt_warn ("could not allocate %04x %04x %04x, getting %04x %04x %04x instead (%d)\n",
      //    color.r, color.g, color.b, best->red, best->green, best->blue, diff);

      got = alloc (screen, rgba (best->red, best->green, best->blue));

      delete [] colors;
    }
#endif

  return got;
}

void
rxvt_color::get (rgba &color)
{
#if XFT
  color.r = c.color.red;
  color.g = c.color.green;
  color.b = c.color.blue;
  color.a = c.color.alpha;
#else
  color.r = c.red;
  color.g = c.green;
  color.b = c.blue;
  color.a = rgba::MAX_CC;
#endif
}

void
rxvt_color::get (XColor &color)
{
  rgba c;
  get (c);

  color.red   = c.r;
  color.green = c.g;
  color.blue  = c.b;
  color.pixel = (Pixel)*this;
}

void
rxvt_color::free (rxvt_screen *screen)
{
  if (screen->visual->c_class == TrueColor)
    return; // nothing to do

#if XFT
  XftColorFree (screen->dpy, screen->visual, screen->cmap, &c);
#else
  XFreeColors (screen->dpy, screen->cmap, &c.pixel, 1, AllPlanes);
#endif
}

void
rxvt_color::fade (rxvt_screen *screen, int percent, rxvt_color &result, const rgba &to)
{
  rgba c;
  get (c);

  result.set (
    screen,
    rgba (
      lerp (c.r, to.r, percent),
      lerp (c.g, to.g, percent),
      lerp (c.b, to.b, percent),
      lerp (c.a, to.a, percent)
    )
  );
}

#if TRACE_PIXMAPS
# undef XCreatePixmap
# undef XFreePixmap
Pixmap trace_XCreatePixmap (const char *file, int line, Display *dpy, Window r, unsigned int w, unsigned int h, unsigned int d)
{
  Pixmap res = XCreatePixmap (dpy, r, w, h, d);
  fprintf (stderr, "%s:%d: XCreatePixmap (%p,%lX,%u,%u,%u) returned %lX\n", file, line, dpy, r, w, h, d, res);
  return res;
}

void trace_XFreePixmap (const char *file, int line, Display *dpy, Pixmap p)
{
  fprintf (stderr, "%s:%d: XFreePixmap (%p,%lX)\n", file, line, dpy, p);
  XFreePixmap (dpy,p);
}
#endif
Revision:	1.93
Committed:	Sat Jan 26 10:24:47 2008 UTC (16 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.92:	+0 -1 lines
Log Message:	* empty log message *
#	Content
1	/----------------------------------------------------------------------
2	* File: rxvttoolkit.C
3	----------------------------------------------------------------------
4	*
5	* All portions of code are copyright by their respective author/s.
6	* Copyright (c) 2003-2007 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	#include <sys/utsname.h>
31	#include <sys/socket.h>
32	#include <sys/un.h>
33
34	#if XFT
35	# include <X11/extensions/Xrender.h>
36	#endif
37
38	const char *const xa_names[] =
39	{
40	"TEXT",
41	"COMPOUND_TEXT",
42	"UTF8_STRING",
43	"MULTIPLE",
44	"TARGETS",
45	"TIMESTAMP",
46	"VT_SELECTION",
47	"INCR",
48	"WM_PROTOCOLS",
49	"WM_DELETE_WINDOW",
50	"CLIPBOARD",
51	"AVERAGE_WIDTH",
52	"WEIGHT_NAME",
53	"SLANT",
54	"CHARSET_REGISTRY",
55	"CHARSET_ENCODING",
56	#if ENABLE_FRILLS
57	"_MOTIF_WM_HINTS",
58	#endif
59	#if ENABLE_EWMH
60	"_NET_WM_PID",
61	"_NET_WM_NAME",
62	"_NET_WM_ICON_NAME",
63	"_NET_WM_PING",
64	#endif
65	#if USE_XIM
66	"WM_LOCALE_NAME",
67	"XIM_SERVERS",
68	#endif
69	#ifdef ENABLE_TRANSPARENCY
70	"_XROOTPMAP_ID",
71	"ESETROOT_PMAP_ID",
72	#endif
73	#if ENABLE_XEMBED
74	"_XEMBED",
75	"_XEMBED_INFO",
76	#endif
77	#if !ENABLE_MINIMAL
78	"SCREEN_RESOURCES",
79	"XDCCC_LINEAR_RGB_CORRECTION",
80	"XDCCC_LINEAR_RGB_MATRICES",
81	"WM_COLORMAP_WINDOWS",
82	"WM_STATE",
83	"cursor",
84	# if USE_XIM
85	"TRANSPORT",
86	"LOCALES",
87	"_XIM_PROTOCOL",
88	"_XIM_XCONNECT",
89	"_XIM_MOREDATA",
90	# endif
91	#endif
92	};
93
94	/////////////////////////////////////////////////////////////////////////////
95
96	refcounted::refcounted (const char *id)
97	{
98	this->id = strdup (id);
99	}
100
101	refcounted::~refcounted ()
102	{
103	free (id);
104	}
105
106	template<class T>
107	T refcache<T>::get (const char id)
108	{
109	for (T **i = this->begin (); i < this->end (); ++i)
110	{
111	if (!strcmp (id, (*i)->id))
112	{
113	++(*i)->referenced;
114	(*i)->ref_next ();
115	return *i;
116	}
117	}
118
119	T *obj = new T (id);
120
121	if (obj && obj->ref_init ())
122	{
123	obj->referenced = 1;
124	this->push_back (obj);
125	return obj;
126	}
127	else
128	{
129	delete obj;
130	return 0;
131	}
132	}
133
134	template<class T>
135	void refcache<T>::put (T *obj)
136	{
137	if (!obj)
138	return;
139
140	if (!--obj->referenced)
141	{
142	this->erase (find (this->begin (), this->end (), obj));
143	delete obj;
144	}
145	}
146
147	template<class T>
148	void refcache<T>::clear ()
149	{
150	while (this->size ())
151	put (*this->begin ());
152	}
153
154	/////////////////////////////////////////////////////////////////////////////
155
156	#ifdef USE_XIM
157
158	static void
159	#if XIMCB_PROTO_BROKEN
160	im_destroy_cb (XIC unused1, XPointer client_data, XPointer unused3)
161	#else
162	im_destroy_cb (XIM unused1, XPointer client_data, XPointer unused3)
163	#endif
164	{
165	rxvt_xim xim = (rxvt_xim )client_data;
166	rxvt_display *display = xim->display;
167
168	xim->xim = 0;
169
170	display->xims.erase (find (display->xims.begin (), display->xims.end (), xim));
171	display->im_change_cb ();
172	}
173
174	bool
175	rxvt_xim::ref_init ()
176	{
177	display = GET_R->display; //HACK: TODO
178
179	xim = XOpenIM (display->dpy, 0, 0, 0);
180
181	if (!xim)
182	return false;
183
184	XIMCallback ximcallback;
185	ximcallback.client_data = (XPointer)this;
186	ximcallback.callback = im_destroy_cb;
187
188	XSetIMValues (xim, XNDestroyCallback, &ximcallback, (char *)0);
189
190	return true;
191	}
192
193	rxvt_xim::~rxvt_xim ()
194	{
195	if (xim)
196	XCloseIM (xim);
197	}
198
199	#endif
200
201	/////////////////////////////////////////////////////////////////////////////
202
203	#if XFT
204	rxvt_drawable::~rxvt_drawable ()
205	{
206	if (xftdrawable)
207	XftDrawDestroy (xftdrawable);
208	}
209
210	rxvt_drawable::operator XftDraw *()
211	{
212	if (!xftdrawable)
213	xftdrawable = XftDrawCreate (screen->dpy, drawable, screen->visual, screen->cmap);
214
215	return xftdrawable;
216	}
217	#endif
218
219	/////////////////////////////////////////////////////////////////////////////
220
221	#if XFT
222
223	// not strictly necessary as it is only used with superclass of zero_initialised
224	rxvt_screen::rxvt_screen ()
225	: scratch_area (0)
226	{
227	}
228
229	rxvt_drawable &rxvt_screen::scratch_drawable (int w, int h)
230	{
231	// it's actually faster to re-allocate every time. don't ask me
232	// why, but its likely no big deal there are no roundtrips
233	// (I think/hope).
234	if (!scratch_area \|\| w > scratch_w \|\| h > scratch_h \|\| 1/D/)
235	{
236	if (scratch_area)
237	{
238	XFreePixmap (dpy, scratch_area->drawable);
239	delete scratch_area;
240	}
241
242	Pixmap pm = XCreatePixmap (dpy, RootWindowOfScreen (ScreenOfDisplay (dpy, display->screen)),
243	scratch_w = w, scratch_h = h, depth);
244
245	scratch_area = new rxvt_drawable (this, pm);
246	}
247
248	return *scratch_area;
249	}
250
251	#endif
252
253	void
254	rxvt_screen::set (rxvt_display *disp)
255	{
256	display = disp;
257	dpy = disp->dpy;
258
259	Screen *screen = ScreenOfDisplay (dpy, disp->screen);
260
261	depth = DefaultDepthOfScreen (screen);
262	visual = DefaultVisualOfScreen (screen);
263	cmap = DefaultColormapOfScreen (screen);
264	}
265
266	void
267	rxvt_screen::select_visual (int bitdepth)
268	{
269	#if XFT
270	XVisualInfo vinfo;
271
272	if (XMatchVisualInfo (dpy, display->screen, bitdepth, TrueColor, &vinfo))
273	{
274	depth = bitdepth;
275	visual = vinfo.visual;
276	cmap = XCreateColormap (dpy, display->root, visual, AllocNone);
277	}
278	#endif
279	}
280
281	void
282	rxvt_screen::clear ()
283	{
284	#if XFT
285	if (scratch_area)
286	{
287	XFreePixmap (dpy, scratch_area->drawable);
288	delete scratch_area;
289	}
290	#endif
291
292	if (cmap != DefaultColormapOfScreen (ScreenOfDisplay (dpy, display->screen)))
293	XFreeColormap (dpy, cmap);
294	}
295
296	/////////////////////////////////////////////////////////////////////////////
297
298	rxvt_display::rxvt_display (const char *id)
299	: refcounted (id)
300	, selection_owner (0)
301	{
302	x_ev .set<rxvt_display, &rxvt_display::x_cb > (this);
303	flush_ev.set<rxvt_display, &rxvt_display::flush_cb> (this);
304	}
305
306	XrmDatabase
307	rxvt_display::get_resources (bool refresh)
308	{
309	char *homedir = getenv ("HOME");
310	char fname[1024];
311
312	/*
313	* get resources using the X library function
314	*/
315	char displayResource, xe;
316	XrmDatabase rdb1, database = 0;
317
318	// for ordering, see for example http://www.faqs.org/faqs/Xt-FAQ/ Subject: 20
319	// as opposed to "standard practise", we always read in ~/.Xdefaults
320
321	// 6. System wide per application default file.
322
323	/* Add in $XAPPLRESDIR/Rxvt only; not bothering with XUSERFILESEARCHPATH */
324	if ((xe = getenv ("XAPPLRESDIR")))
325	{
326	snprintf (fname, sizeof (fname), "%s/%s", xe, RESCLASS);
327
328	if ((rdb1 = XrmGetFileDatabase (fname)))
329	XrmMergeDatabases (rdb1, &database);
330	}
331
332	// 5. User's per application default file.
333	// none
334
335	// 4. User's defaults file.
336	if (homedir)
337	{
338	snprintf (fname, sizeof (fname), "%s/.Xdefaults", homedir);
339
340	if ((rdb1 = XrmGetFileDatabase (fname)))
341	XrmMergeDatabases (rdb1, &database);
342	}
343
344	/* Get any Xserver defaults */
345	if (refresh)
346	{
347	// fucking xlib keeps a copy of the rm string
348	Atom actual_type;
349	int actual_format;
350	unsigned long nitems, nremaining;
351	char *val = 0;
352
353	#if XLIB_ILLEGAL_ACCESS
354	if (dpy->xdefaults)
355	XFree (dpy->xdefaults);
356	#endif
357
358	if (XGetWindowProperty (dpy, RootWindow (dpy, 0), XA_RESOURCE_MANAGER,
359	0L, 100000000L, False,
360	XA_STRING, &actual_type, &actual_format,
361	&nitems, &nremaining,
362	(unsigned char **)&val) == Success
363	&& actual_type == XA_STRING
364	&& actual_format == 8)
365	displayResource = val;
366	else
367	{
368	displayResource = 0;
369
370	if (val)
371	XFree(val);
372	}
373
374	#if XLIB_ILLEGAL_ACCESS
375	dpy->xdefaults = displayResource;
376	#endif
377	}
378	else
379	displayResource = XResourceManagerString (dpy);
380
381	if (displayResource)
382	{
383	if ((rdb1 = XrmGetStringDatabase (displayResource)))
384	XrmMergeDatabases (rdb1, &database);
385	}
386
387	#if !XLIB_ILLEGAL_ACCESS
388	if (refresh && displayResource)
389	XFree (displayResource);
390	#endif
391
392	/* Get screen specific resources */
393	displayResource = XScreenResourceString (ScreenOfDisplay (dpy, screen));
394
395	if (displayResource)
396	{
397	if ((rdb1 = XrmGetStringDatabase (displayResource)))
398	/* Merge with screen-independent resources */
399	XrmMergeDatabases (rdb1, &database);
400
401	XFree (displayResource);
402	}
403
404	// 3. User's per host defaults file
405	/* Add in XENVIRONMENT file */
406	if ((xe = getenv ("XENVIRONMENT"))
407	&& (rdb1 = XrmGetFileDatabase (xe)))
408	XrmMergeDatabases (rdb1, &database);
409	else if (homedir)
410	{
411	struct utsname un;
412
413	if (!uname (&un))
414	{
415	snprintf (fname, sizeof (fname), "%s/.Xdefaults-%s", homedir, un.nodename);
416
417	if ((rdb1 = XrmGetFileDatabase (fname)))
418	XrmMergeDatabases (rdb1, &database);
419	}
420	}
421
422	return database;
423	}
424
425	bool rxvt_display::ref_init ()
426	{
427	#ifdef LOCAL_X_IS_UNIX
428	if (id[0] == ':')
429	{
430	val = rxvt_malloc (5 + strlen (id) + 1);
431	strcpy (val, "unix/");
432	strcat (val, id);
433	dpy = XOpenDisplay (val);
434	free (val);
435	}
436	else
437	#endif
438	dpy = 0;
439
440	if (!dpy)
441	dpy = XOpenDisplay (id);
442
443	if (!dpy)
444	return false;
445
446	screen = DefaultScreen (dpy);
447	root = DefaultRootWindow (dpy);
448
449	assert (sizeof (xa_names) / sizeof (char *) == NUM_XA);
450	XInternAtoms (dpy, (char **)xa_names, NUM_XA, False, xa);
451
452	XrmSetDatabase (dpy, get_resources (false));
453
454	#ifdef POINTER_BLANK
455	XColor blackcolour;
456	blackcolour.red = 0;
457	blackcolour.green = 0;
458	blackcolour.blue = 0;
459	Font f = XLoadFont (dpy, "fixed");
460	blank_cursor = XCreateGlyphCursor (dpy, f, f, ' ', ' ',
461	&blackcolour, &blackcolour);
462	XUnloadFont (dpy, f);
463	#endif
464
465	int fd = XConnectionNumber (dpy);
466
467	// try to detect wether we have a local connection.
468	// assume unix domain socket == local, everything else not
469	// TODO: might want to check for inet/127.0.0.1
470	is_local = 0;
471	sockaddr_un sa;
472	socklen_t sl = sizeof (sa);
473
474	if (!getsockname (fd, (sockaddr *)&sa, &sl))
475	is_local = sa.sun_family == AF_UNIX;
476
477	flush_ev.start ();
478	x_ev.start (fd, ev::READ);
479	fcntl (fd, F_SETFD, FD_CLOEXEC);
480
481	XSelectInput (dpy, root, PropertyChangeMask);
482
483	flush ();
484
485	return true;
486	}
487
488	void
489	rxvt_display::ref_next ()
490	{
491	// TODO: somehow check wether the database files/resources changed
492	// before affording re-loading/parsing
493	XrmDestroyDatabase (XrmGetDatabase (dpy));
494	XrmSetDatabase (dpy, get_resources (true));
495	}
496
497	rxvt_display::~rxvt_display ()
498	{
499	if (!dpy)
500	return;
501
502	#ifdef POINTER_BLANK
503	XFreeCursor (dpy, blank_cursor);
504	#endif
505	x_ev.stop ();
506	flush_ev.stop ();
507	#ifdef USE_XIM
508	xims.clear ();
509	#endif
510	XCloseDisplay (dpy);
511	}
512
513	#ifdef USE_XIM
514	void rxvt_display::im_change_cb ()
515	{
516	for (im_watcher **i = imw.begin (); i != imw.end (); ++i)
517	(*i)->call ();
518	}
519
520	void rxvt_display::im_change_check ()
521	{
522	// try to only call im_change_cb when a new input method
523	// registers, as xlib crashes due to a race otherwise.
524	Atom actual_type, *atoms;
525	int actual_format;
526	unsigned long nitems, bytes_after;
527
528	if (XGetWindowProperty (dpy, root, xa[XA_XIM_SERVERS], 0L, 1000000L,
529	False, XA_ATOM, &actual_type, &actual_format,
530	&nitems, &bytes_after, (unsigned char **)&atoms)
531	!= Success )
532	return;
533
534	if (actual_type == XA_ATOM && actual_format == 32)
535	for (int i = 0; i < nitems; i++)
536	if (XGetSelectionOwner (dpy, atoms[i]))
537	{
538	im_change_cb ();
539	break;
540	}
541
542	XFree (atoms);
543	}
544	#endif
545
546	void rxvt_display::x_cb (ev::io &w, int revents)
547	{
548	while (XEventsQueued (dpy, QueuedAfterReading))
549	{
550	XEvent xev;
551	XNextEvent (dpy, &xev);
552
553	flush_ev.start ();
554
555	#ifdef USE_XIM
556	if (!XFilterEvent (&xev, None))
557	#endif
558	{
559	if (xev.type == PropertyNotify
560	&& xev.xany.window == root
561	&& xev.xproperty.atom == xa[XA_XIM_SERVERS])
562	im_change_check ();
563	if (xev.type == MappingNotify)
564	XRefreshKeyboardMapping (&xev.xmapping);
565
566	for (int i = xw.size (); i--; )
567	{
568	if (!xw[i])
569	xw.erase_unordered (i);
570	else if (xw[i]->window == xev.xany.window)
571	xw[i]->call (xev);
572	}
573	}
574	}
575
576	XFlush (dpy);
577	}
578
579	void rxvt_display::flush_cb (ev::idle &w, int revents)
580	{
581	XFlush (dpy);
582	}
583
584	void rxvt_display::reg (xevent_watcher *w)
585	{
586	if (!w->active)
587	{
588	xw.push_back (w);
589	w->active = xw.size ();
590	}
591	}
592
593	void rxvt_display::unreg (xevent_watcher *w)
594	{
595	if (w->active)
596	{
597	xw[w->active - 1] = 0;
598	w->active = 0;
599	}
600	}
601
602	void rxvt_display::set_selection_owner (rxvt_term *owner)
603	{
604	if (selection_owner && selection_owner != owner)
605	{
606	rxvt_term *owner = selection_owner;
607
608	owner->selection_clear ();
609	owner->flush ();
610	}
611
612	selection_owner = owner;
613	}
614
615	#ifdef USE_XIM
616
617	void rxvt_display::reg (im_watcher *w)
618	{
619	imw.push_back (w);
620	}
621
622	void rxvt_display::unreg (im_watcher *w)
623	{
624	imw.erase (find (imw.begin (), imw.end (), w));
625	}
626
627	rxvt_xim rxvt_display::get_xim (const char locale, const char *modifiers)
628	{
629	char *id;
630	int l, m;
631
632	l = strlen (locale);
633	m = strlen (modifiers);
634
635	if (!(id = (char *)malloc (l + m + 2)))
636	return 0;
637
638	memcpy (id, locale, l); id[l] = '\n';
639	memcpy (id + l + 1, modifiers, m); id[l + m + 1] = 0;
640
641	rxvt_xim *xim = xims.get (id);
642
643	free (id);
644
645	return xim;
646	}
647
648	void rxvt_display::put_xim (rxvt_xim *xim)
649	{
650	# if XLIB_IS_RACEFREE
651	xims.put (xim);
652	# endif
653	}
654
655	#endif
656
657	Atom rxvt_display::atom (const char *name)
658	{
659	return XInternAtom (dpy, name, False);
660	}
661
662	/////////////////////////////////////////////////////////////////////////////
663
664	template class refcache<rxvt_display>;
665	refcache<rxvt_display> displays;
666
667	/////////////////////////////////////////////////////////////////////////////
668	//
669
670	static unsigned int
671	insert_component (unsigned int value, unsigned int mask, unsigned int shift)
672	{
673	return (value * (mask + 1) >> 16) << shift;
674	}
675
676	bool
677	rxvt_color::alloc (rxvt_screen *screen, const rgba &color)
678	{
679	//TODO: only supports 24 bit
680	int alpha = color.a >= 0xff00 ? 0xffff : color.a;
681
682	#if XFT
683	XRenderPictFormat *format;
684
685	// FUCKING Xft gets it wrong, of course, so work around it.
686	// Transparency users should eat shit and die, and then
687	// XRenderQueryPictIndexValues themselves plenty.
688	if ((screen->visual->c_class == TrueColor)
689	&& (format = XRenderFindVisualFormat (screen->dpy, screen->visual)))
690	{
691	// the fun lies in doing everything manually...
692	c.color.red = color.r;
693	c.color.green = color.g;
694	c.color.blue = color.b;
695	c.color.alpha = alpha;
696
697	c.pixel = insert_component (color.r, format->direct.redMask , format->direct.red )
698	\| insert_component (color.g, format->direct.greenMask, format->direct.green)
699	\| insert_component (color.b, format->direct.blueMask , format->direct.blue )
700	\| insert_component (alpha , format->direct.alphaMask, format->direct.alpha);
701
702	return true;
703	}
704	else
705	{
706	XRenderColor d;
707
708	d.red = color.r;
709	d.green = color.g;
710	d.blue = color.b;
711	d.alpha = alpha;
712
713	return XftColorAllocValue (screen->dpy, screen->visual, screen->cmap, &d, &c);
714	}
715	#else
716	c.red = color.r;
717	c.green = color.g;
718	c.blue = color.b;
719
720	if (screen->visual->c_class == TrueColor)
721	{
722	c.pixel = (color.r >> (16 - popcount (screen->visual->red_mask )) << ctz (screen->visual->red_mask ))
723	\| (color.g >> (16 - popcount (screen->visual->green_mask)) << ctz (screen->visual->green_mask))
724	\| (color.b >> (16 - popcount (screen->visual->blue_mask )) << ctz (screen->visual->blue_mask ));
725
726	return true;
727	}
728	else if (XAllocColor (screen->dpy, screen->cmap, &c))
729	return true;
730	else
731	c.pixel = (color.r + color.g + color.b) > 128*3
732	? WhitePixelOfScreen (DefaultScreenOfDisplay (screen->dpy))
733	: BlackPixelOfScreen (DefaultScreenOfDisplay (screen->dpy));
734	#endif
735
736	return false;
737	}
738
739	bool
740	rxvt_color::set (rxvt_screen screen, const char name)
741	{
742	rgba c;
743	char eos;
744	int skip;
745
746	c.a = rgba::MAX_CC;
747
748	// parse the nonstandard "[alphapercent]" prefix
749	if (1 <= sscanf (name, "[%hd]%n", &c.a, &skip))
750	{
751	c.a = lerp<int, int, int> (0, rgba::MAX_CC, c.a);
752	name += skip;
753	}
754
755	// parse the non-standard "rgba:rrrr/gggg/bbbb/aaaa" format
756	if (strlen (name) != 4+5*4 \|\| 4 != sscanf (name, "rgba:%4hx/%4hx/%4hx/%4hx%c", &c.r, &c.g, &c.b, &c.a, &eos))
757	{
758	XColor xc;
759
760	if (XParseColor (screen->dpy, screen->cmap, name, &xc))
761	{
762	c.r = xc.red;
763	c.g = xc.green;
764	c.b = xc.blue;
765	}
766	else
767	{
768	c.r = 0xffff;
769	c.g = 0x6969;
770	c.b = 0xb4b4;
771
772	rxvt_warn ("unable to parse color '%s', using pink instead.\n", name);
773	}
774	}
775
776	return set (screen, c);
777	}
778
779	bool
780	rxvt_color::set (rxvt_screen *screen, const rgba &color)
781	{
782	bool got = alloc (screen, color);
783
784	#if !ENABLE_MINIMAL
785	int cmap_size = screen->visual->map_entries;
786
787	if (!got
788	&& screen->visual->c_class == PseudoColor
789	&& cmap_size < 4096)
790	{
791	XColor *colors = new XColor [screen->visual->map_entries];
792
793	for (int i = 0; i < cmap_size; i++)
794	colors [i].pixel = i;
795
796	// many kilobytes transfer per colour, but pseudocolor isn't worth
797	// many extra optimisations.
798	XQueryColors (screen->dpy, screen->cmap, colors, cmap_size);
799
800	int diff = 0x7fffffffUL;
801	XColor *best = colors;
802
803	for (int i = 0; i < cmap_size; i++)
804	{
805	int d = (squared_diff<int> (color.r >> 2, colors [i].red >> 2))
806	+ (squared_diff<int> (color.g >> 2, colors [i].green >> 2))
807	+ (squared_diff<int> (color.b >> 2, colors [i].blue >> 2));
808
809	if (d < diff)
810	{
811	diff = d;
812	best = colors + i;
813	}
814	}
815
816	//rxvt_warn ("could not allocate %04x %04x %04x, getting %04x %04x %04x instead (%d)\n",
817	// color.r, color.g, color.b, best->red, best->green, best->blue, diff);
818
819	got = alloc (screen, rgba (best->red, best->green, best->blue));
820
821	delete [] colors;
822	}
823	#endif
824
825	return got;
826	}
827
828	void
829	rxvt_color::get (rgba &color)
830	{
831	#if XFT
832	color.r = c.color.red;
833	color.g = c.color.green;
834	color.b = c.color.blue;
835	color.a = c.color.alpha;
836	#else
837	color.r = c.red;
838	color.g = c.green;
839	color.b = c.blue;
840	color.a = rgba::MAX_CC;
841	#endif
842	}
843
844	void
845	rxvt_color::get (XColor &color)
846	{
847	rgba c;
848	get (c);
849
850	color.red = c.r;
851	color.green = c.g;
852	color.blue = c.b;
853	color.pixel = (Pixel)*this;
854	}
855
856	void
857	rxvt_color::free (rxvt_screen *screen)
858	{
859	if (screen->visual->c_class == TrueColor)
860	return; // nothing to do
861
862	#if XFT
863	XftColorFree (screen->dpy, screen->visual, screen->cmap, &c);
864	#else
865	XFreeColors (screen->dpy, screen->cmap, &c.pixel, 1, AllPlanes);
866	#endif
867	}
868
869	void
870	rxvt_color::fade (rxvt_screen *screen, int percent, rxvt_color &result, const rgba &to)
871	{
872	rgba c;
873	get (c);
874
875	result.set (
876	screen,
877	rgba (
878	lerp (c.r, to.r, percent),
879	lerp (c.g, to.g, percent),
880	lerp (c.b, to.b, percent),
881	lerp (c.a, to.a, percent)
882	)
883	);
884	}
885
886	#if TRACE_PIXMAPS
887	# undef XCreatePixmap
888	# undef XFreePixmap
889	Pixmap trace_XCreatePixmap (const char file, int line, Display dpy, Window r, unsigned int w, unsigned int h, unsigned int d)
890	{
891	Pixmap res = XCreatePixmap (dpy, r, w, h, d);
892	fprintf (stderr, "%s:%d: XCreatePixmap (%p,%lX,%u,%u,%u) returned %lX\n", file, line, dpy, r, w, h, d, res);
893	return res;
894	}
895
896	void trace_XFreePixmap (const char file, int line, Display dpy, Pixmap p)
897	{
898	fprintf (stderr, "%s:%d: XFreePixmap (%p,%lX)\n", file, line, dpy, p);
899	XFreePixmap (dpy,p);
900	}
901	#endif