Anti-Grain Geometry Tutorial
agg_span_pattern_gray.h
1 //----------------------------------------------------------------------------
2 // Anti-Grain Geometry - Version 2.4
3 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
4 //
5 // Permission to copy, use, modify, sell and distribute this software
6 // is granted provided this copyright notice appears in all copies.
7 // This software is provided "as is" without express or implied
8 // warranty, and with no claim as to its suitability for any purpose.
9 //
10 //----------------------------------------------------------------------------
11 // Contact: mcseem@antigrain.com
12 // mcseemagg@yahoo.com
13 // http://www.antigrain.com
14 //----------------------------------------------------------------------------
15 //
16 // Adaptation for high precision colors has been sponsored by
17 // Liberty Technology Systems, Inc., visit http://lib-sys.com
18 //
19 // Liberty Technology Systems, Inc. is the provider of
20 // PostScript and PDF technology for software developers.
21 //
22 //----------------------------------------------------------------------------
23 
24 
25 #ifndef AGG_SPAN_PATTERN_GRAY_INCLUDED
26 #define AGG_SPAN_PATTERN_GRAY_INCLUDED
27 
28 #include "agg_basics.h"
29 
30 namespace agg
31 {
32 
33  //=======================================================span_pattern_gray
34  template<class Source> class span_pattern_gray
35  {
36  public:
37  typedef Source source_type;
38  typedef typename source_type::color_type color_type;
39  typedef typename color_type::value_type value_type;
40  typedef typename color_type::calc_type calc_type;
41 
42  //--------------------------------------------------------------------
43  span_pattern_gray() {}
44  span_pattern_gray(source_type& src,
45  unsigned offset_x, unsigned offset_y) :
46  m_src(&src),
47  m_offset_x(offset_x),
48  m_offset_y(offset_y),
49  m_alpha(color_type::base_mask)
50  {}
51 
52  //--------------------------------------------------------------------
53  void attach(source_type& v) { m_src = &v; }
54  source_type& source() { return *m_src; }
55  const source_type& source() const { return *m_src; }
56 
57  //--------------------------------------------------------------------
58  void offset_x(unsigned v) { m_offset_x = v; }
59  void offset_y(unsigned v) { m_offset_y = v; }
60  unsigned offset_x() const { return m_offset_x; }
61  unsigned offset_y() const { return m_offset_y; }
62  void alpha(value_type v) { m_alpha = v; }
63  value_type alpha() const { return m_alpha; }
64 
65  //--------------------------------------------------------------------
66  void prepare() {}
67  void generate(color_type* span, int x, int y, unsigned len)
68  {
69  x += m_offset_x;
70  y += m_offset_y;
71  const value_type* p = (const value_type*)m_src->span(x, y, len);
72  do
73  {
74  span->v = *p;
75  span->a = m_alpha;
76  p = m_src->next_x();
77  ++span;
78  }
79  while(--len);
80  }
81 
82  private:
83  source_type* m_src;
84  unsigned m_offset_x;
85  unsigned m_offset_y;
86  value_type m_alpha;
87 
88  };
89 
90 }
91 
92 #endif
93 
agg::span_pattern_gray
Definition: agg_span_pattern_gray.h:34
agg
Definition: agg_arc.cpp:24