ViewBase.h
1 /* Copyright (C) 2015 Marc Boris Duerner
2 
3  This library is free software; you can redistribute it and/or
4  modify it under the terms of the GNU Lesser General Public
5  License as published by the Free Software Foundation; either
6  version 2.1 of the License, or (at your option) any later version.
7 
8  As a special exception, you may use this file as part of a free
9  software library without restriction. Specifically, if other files
10  instantiate templates or use macros or inline functions from this
11  file, or you compile this file and link it with other files to
12  produce an executable, this file does not by itself cause the
13  resulting executable to be covered by the GNU General Public
14  License. This exception does not however invalidate any other
15  reasons why the executable file might be covered by the GNU Library
16  General Public License.
17 
18  This library is distributed in the hope that it will be useful,
19  but WITHOUT ANY WARRANTY; without even the implied warranty of
20  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  Lesser General Public License for more details.
22 
23  You should have received a copy of the GNU Lesser General Public
24  License along with this library; if not, write to the Free Software
25  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
26  MA 02110-1301 USA
27 */
28 
29 #ifndef PT_GFX_VIEWBASE_H
30 #define PT_GFX_VIEWBASE_H
31 
32 #include <Pt/Gfx/Api.h>
33 #include <Pt/Types.h>
34 
35 namespace Pt {
36 
37 namespace Gfx {
38 
39 class ViewBase
40 {
41  public:
42  typedef Pt::ssize_t pos_t;
43  typedef Pt::ssize_t length_t;
44 
45  public:
46  ViewBase()
47  : _width(0)
48  , _height(0)
49  , _stride(0)
50  { }
51 
52  ViewBase(Pt::ssize_t width, Pt::ssize_t height,
53  Pt::ssize_t stride)
54  : _width(width)
55  , _height(height)
56  , _stride(stride)
57  { }
58 
59  Pt::ssize_t width() const
60  { return _width; }
61 
62  Pt::ssize_t height() const
63  { return _height; }
64 
65  bool empty() const
66  { return _width == 0 || _height == 0; }
67 
68  Pt::ssize_t stride() const
69  { return _stride; }
70 
71  protected:
72  ~ViewBase()
73  { }
74 
75  protected:
76  void setDimensions(Pt::ssize_t w, Pt::ssize_t h,
77  Pt::ssize_t s)
78  {
79  _width = w;
80  _height = h;
81  _stride = s;
82  }
83 
84  private:
85  Pt::ssize_t _width;
86  Pt::ssize_t _height;
87  Pt::ssize_t _stride;
88 };
89 
90 } // namespace
91 
92 } // namespace
93 
94 #endif