lib/Pen.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // Pen.cc for Blackbox - an X11 Window manager
   3 // Copyright (c) 2001 - 2005 Sean 'Shaleh' Perry <shaleh@debian.org>
   4 // Copyright (c) 1997 - 2000, 2002 - 2005
   5 //         Bradley T Hughes <bhughes at trolltech.com>
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining a
   8 // copy of this software and associated documentation files (the "Software"),
   9 // to deal in the Software without restriction, including without limitation
  10 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11 // and/or sell copies of the Software, and to permit persons to whom the
  12 // Software is furnished to do so, subject to the following conditions:
  13 //
  14 // The above copyright notice and this permission notice shall be included in
  15 // all copies or substantial portions of the Software.
  16 //
  17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23 // DEALINGS IN THE SOFTWARE.
  24
  25 #include "Pen.hh"
  26 #include "Display.hh"
  27 #include "Color.hh"
  28 #include "Util.hh"
  29
  30 #include <algorithm>
  31
  32 #include <X11/Xlib.h>
  33 #ifdef XFT
  34 #  include <X11/Xft/Xft.h>
  35 #endif
  36
  37 #include <assert.h>
  38 #include <stdio.h>
  39
  40 namespace bt {
  41
  42   class PenLoader
  43   {
  44     const Display &_display;
  45   public:
  46     PenLoader(const Display &display_)
  47       : _display(display_)
  48     { }
  49     const Display &display(void) const
  50     { return _display; }
  51     ::Display *XDisplay(void) const
  52     { return _display.XDisplay(); }
  53   };
  54
  55   static PenLoader *penloader = 0;
  56
  57   void createPenLoader(const Display &display)
  58   {
  59     assert(penloader == 0);
  60     penloader = new PenLoader(display);
  61   }
  62   void destroyPenLoader(void)
  63   {
  64     delete penloader;
  65     penloader = 0;
  66   }
  67
  68 } // namespace bt
  69
  70 bt::Pen::Pen(unsigned int screen_)
  71   : _screen(screen_), _function(GXcopy),  _linewidth(0),
  72     _subwindow(ClipByChildren), _dirty(false), _gc(0), _xftdraw(0)
  73 { }
  74
  75 bt::Pen::Pen(unsigned int screen_, const Color &color_)
  76   : _screen(screen_), _color(color_), _function(GXcopy), _linewidth(0),
  77     _subwindow(ClipByChildren), _dirty(false), _gc(0), _xftdraw(0)
  78 { }
  79
  80 bt::Pen::~Pen(void)
  81 {
  82   if (_gc)
  83     XFreeGC(penloader->XDisplay(), _gc);
  84   _gc = 0;
  85
  86 #ifdef XFT
  87   if (_xftdraw)
  88     XftDrawDestroy(_xftdraw);
  89   _xftdraw = 0;
  90 #endif
  91 }
  92
  93 void bt::Pen::setColor(const Color &color_)
  94 {
  95   _color = color_;
  96   _dirty = true;
  97 }
  98
  99 void bt::Pen::setGCFunction(int function)
 100 {
 101   _function = function;
 102   _dirty = true;
 103 }
 104
 105 void bt::Pen::setLineWidth(int linewidth)
 106 {
 107   _linewidth = linewidth;
 108   _dirty = true;
 109 }
 110
 111 void bt::Pen::setSubWindowMode(int subwindow)
 112 {
 113   _subwindow = subwindow;
 114   _dirty = true;
 115 }
 116
 117 ::Display *bt::Pen::XDisplay(void) const
 118 { return penloader->XDisplay(); }
 119
 120 const bt::Display &bt::Pen::display(void) const
 121 { return penloader->display(); }
 122
 123 const GC &bt::Pen::gc(void) const
 124 {
 125   if (!_gc || _dirty) {
 126     XGCValues gcv;
 127     gcv.foreground = _color.pixel(_screen);
 128     gcv.function = _function;
 129     gcv.line_width = _linewidth;
 130     gcv.subwindow_mode = _subwindow;
 131     if (!_gc) {
 132       _gc = XCreateGC(penloader->XDisplay(),
 133                       penloader->display().screenInfo(_screen).rootWindow(),
 134                       (GCForeground
 135                        | GCFunction
 136                        | GCLineWidth
 137                        | GCSubwindowMode),
 138                       &gcv);
 139
 140     } else {
 141       XChangeGC(penloader->XDisplay(),
 142                 _gc,
 143                 (GCForeground
 144                  | GCFunction
 145                  | GCLineWidth
 146                  | GCSubwindowMode),
 147                 &gcv);
 148     }
 149     _dirty = false;
 150   }
 151   assert(_gc != 0);
 152   return _gc;
 153 }
 154
 155 XftDraw *bt::Pen::xftDraw(Drawable drawable) const
 156 {
 157 #ifdef XFT
 158   if (!_xftdraw) {
 159     const ScreenInfo &screeninfo = penloader->display().screenInfo(_screen);
 160     _xftdraw = XftDrawCreate(penloader->XDisplay(),
 161                              drawable,
 162                              screeninfo.visual(),
 163                              screeninfo.colormap());
 164   } else if (XftDrawDrawable(_xftdraw) != drawable) {
 165     XftDrawChange(_xftdraw, drawable);
 166   }
 167   assert(_xftdraw != 0);
 168   return _xftdraw;
 169 #else
 170   return 0;
 171 #endif
 172 }
 173