don't deref null
[blackbox.git] / lib / Pen.hh
blobe5811aef32a3b6fa450c34f6a2f0a0972d923b7d
1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
2 // Pen.hh 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:
14 // The above copyright notice and this permission notice shall be included in
15 // all copies or substantial portions of the Software.
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.
25 #ifndef __Pen_hh
26 #define __Pen_hh
28 #include "Util.hh"
30 typedef struct _XftDraw XftDraw;
32 namespace bt {
34 // forward declarations
35 class Color;
36 class Display;
37 class PenCacheItem;
38 class XftCacheItem;
40 class Pen : public NoCopy {
41 public:
42 static void clearCache(void);
44 Pen(unsigned int screen_, const Color &color_);
45 ~Pen(void);
47 inline unsigned int screen(void) const
48 { return _screen; }
49 inline const Color &color(void) const
50 { return _color; }
52 void setGCFunction(int function);
53 void setLineWidth(int linewidth);
54 void setSubWindowMode(int subwindow);
56 ::Display *XDisplay(void) const;
57 const Display &display(void) const;
58 const GC &gc(void) const;
60 XftDraw *xftDraw(Drawable drawable) const;
62 private:
63 unsigned int _screen;
65 const Color &_color;
66 int _function;
67 int _linewidth;
68 int _subwindow;
70 mutable PenCacheItem *_item;
71 mutable XftCacheItem *_xftitem;
74 } // namespace bt
76 #endif // __Pen_hh