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1 
2 //----------------------------------------------------------------------------
3 // Anti-Grain Geometry - Version 2.3
4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
5 //
6 // Permission to copy, use, modify, sell and distribute this software
7 // is granted provided this copyright notice appears in all copies.
8 // This software is provided "as is" without express or implied
9 // warranty, and with no claim as to its suitability for any purpose.
10 //
11 //----------------------------------------------------------------------------
12 // Contact: mcseem@antigrain.com
13 //          mcseemagg@yahoo.com
14 //          http://www.antigrain.com
15 //----------------------------------------------------------------------------
16 //
17 // class renderer_base
18 //
19 //----------------------------------------------------------------------------
20 #ifndef AGG_RENDERER_BASE_INCLUDED
21 #define AGG_RENDERER_BASE_INCLUDED
22 #include "agg_basics.h"
23 #include "agg_rendering_buffer.h"
24 namespace agg
25 {
26 template<class PixelFormat> class renderer_base
27 {
28 public:
29     typedef PixelFormat pixfmt_type;
30     typedef typename pixfmt_type::color_type color_type;
31     typedef typename pixfmt_type::row_data row_data;
32     typedef typename pixfmt_type::span_data span_data;
renderer_base()33     renderer_base() : m_ren(0), m_clip_box(1, 1, 0, 0) {}
renderer_base(pixfmt_type & ren)34     renderer_base(pixfmt_type& ren) :
35         m_ren(&ren),
36         m_clip_box(0, 0, ren.width() - 1, ren.height() - 1)
37     {}
attach(pixfmt_type & ren)38     void attach(pixfmt_type& ren)
39     {
40         m_ren = &ren;
41         m_clip_box = rect(0, 0, ren.width() - 1, ren.height() - 1);
42     }
ren()43     const pixfmt_type& ren() const
44     {
45         return *m_ren;
46     }
ren()47     pixfmt_type& ren()
48     {
49         return *m_ren;
50     }
width()51     unsigned width()  const
52     {
53         return m_ren->width();
54     }
height()55     unsigned height() const
56     {
57         return m_ren->height();
58     }
first_clip_box()59     void first_clip_box() {}
next_clip_box()60     bool next_clip_box()
61     {
62         return false;
63     }
clip_box()64     const rect& clip_box() const
65     {
66         return m_clip_box;
67     }
xmin()68     int         xmin()     const
69     {
70         return m_clip_box.x1;
71     }
ymin()72     int         ymin()     const
73     {
74         return m_clip_box.y1;
75     }
xmax()76     int         xmax()     const
77     {
78         return m_clip_box.x2;
79     }
ymax()80     int         ymax()     const
81     {
82         return m_clip_box.y2;
83     }
bounding_clip_box()84     const rect& bounding_clip_box() const
85     {
86         return m_clip_box;
87     }
bounding_xmin()88     int         bounding_xmin()     const
89     {
90         return m_clip_box.x1;
91     }
bounding_ymin()92     int         bounding_ymin()     const
93     {
94         return m_clip_box.y1;
95     }
bounding_xmax()96     int         bounding_xmax()     const
97     {
98         return m_clip_box.x2;
99     }
bounding_ymax()100     int         bounding_ymax()     const
101     {
102         return m_clip_box.y2;
103     }
blend_hline(int x1,int y,int x2,const color_type & c,cover_type cover)104     void blend_hline(int x1, int y, int x2,
105                      const color_type& c, cover_type cover)
106     {
107         if(x1 > x2) {
108             int t = x2;
109             x2 = x1;
110             x1 = t;
111         }
112         if(y  > ymax()) {
113             return;
114         }
115         if(y  < ymin()) {
116             return;
117         }
118         if(x1 > xmax()) {
119             return;
120         }
121         if(x2 < xmin()) {
122             return;
123         }
124         if(x1 < xmin()) {
125             x1 = xmin();
126         }
127         if(x2 > xmax()) {
128             x2 = xmax();
129         }
130         m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover);
131     }
blend_solid_hspan(int x,int y,int len,const color_type & c,const cover_type * covers)132     void blend_solid_hspan(int x, int y, int len,
133                            const color_type& c,
134                            const cover_type* covers)
135     {
136         if(y > ymax()) {
137             return;
138         }
139         if(y < ymin()) {
140             return;
141         }
142         if(x < xmin()) {
143             len -= xmin() - x;
144             if(len <= 0) {
145                 return;
146             }
147             covers += xmin() - x;
148             x = xmin();
149         }
150         if(x + len > xmax()) {
151             len = xmax() - x + 1;
152             if(len <= 0) {
153                 return;
154             }
155         }
156         m_ren->blend_solid_hspan(x, y, len, c, covers);
157     }
158 private:
159     pixfmt_type* m_ren;
160     rect         m_clip_box;
161 };
162 }
163 #endif
164