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         //--------------------------------------------------------------------
span_pattern_gray()43         span_pattern_gray() {}
span_pattern_gray(source_type & src,unsigned offset_x,unsigned offset_y)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         //--------------------------------------------------------------------
attach(source_type & v)53         void   attach(source_type& v)      { m_src = &v; }
source()54                source_type& source()       { return *m_src; }
source()55         const  source_type& source() const { return *m_src; }
56 
57         //--------------------------------------------------------------------
offset_x(unsigned v)58         void       offset_x(unsigned v) { m_offset_x = v; }
offset_y(unsigned v)59         void       offset_y(unsigned v) { m_offset_y = v; }
offset_x()60         unsigned   offset_x() const { return m_offset_x; }
offset_y()61         unsigned   offset_y() const { return m_offset_y; }
alpha(value_type v)62         void       alpha(value_type v) { m_alpha = v; }
alpha()63         value_type alpha() const { return m_alpha; }
64 
65         //--------------------------------------------------------------------
prepare()66         void prepare() {}
generate(color_type * span,int x,int y,unsigned len)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 
94