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 rendering_buffer
18 //
19 //----------------------------------------------------------------------------
20 #ifndef AGG_RENDERING_BUFFER_INCLUDED
21 #define AGG_RENDERING_BUFFER_INCLUDED
22 #include "agg_basics.h"
23 namespace agg
24 {
25 class rendering_buffer
26 {
27 public:
28     struct row_data  {
29         int x1, x2;
30         const int8u* ptr;
row_datarow_data31         row_data() {}
row_datarow_data32         row_data(int x1_, int x2_, const int8u* ptr_) :
33             x1(x1_), x2(x2_), ptr(ptr_) {}
34     };
35     struct span_data  {
36         int x;
37         unsigned len;
38         int8u* ptr;
span_dataspan_data39         span_data() {}
span_dataspan_data40         span_data(int) : x(0), len(0), ptr(0) {}
span_dataspan_data41         span_data(int x_, unsigned len_, int8u* ptr_) :
42             x(x_), len(len_), ptr(ptr_) {}
43     };
~rendering_buffer()44     ~rendering_buffer()
45     {
46         FX_Free(m_rows);
47     }
rendering_buffer()48     rendering_buffer() :
49         m_buf(0),
50         m_rows(0),
51         m_width(0),
52         m_height(0),
53         m_stride(0),
54         m_max_height(0)
55     {
56     }
rendering_buffer(int8u * buf,unsigned width,unsigned height,int stride)57     rendering_buffer(int8u* buf, unsigned width, unsigned height, int stride) :
58         m_buf(0),
59         m_rows(0),
60         m_width(0),
61         m_height(0),
62         m_stride(0),
63         m_max_height(0)
64     {
65         attach(buf, width, height, stride);
66     }
attach(int8u * buf,unsigned width,unsigned height,int stride)67     void attach(int8u* buf, unsigned width, unsigned height, int stride)
68     {
69         m_buf = buf;
70         m_width = width;
71         m_height = height;
72         m_stride = stride;
73         if(height > m_max_height) {
74             FX_Free(m_rows);
75             m_rows = FX_Alloc(int8u*, m_max_height = height);
76         }
77         int8u* row_ptr = m_buf;
78         if(stride < 0) {
79             row_ptr = m_buf - int(height - 1) * stride;
80         }
81         int8u** rows = m_rows;
82         while(height--) {
83             *rows++ = row_ptr;
84             row_ptr += stride;
85         }
86     }
buf()87     int8u* buf()
88     {
89         return m_buf;
90     }
buf()91     const int8u* buf()    const
92     {
93         return m_buf;
94     }
width()95     unsigned width()  const
96     {
97         return m_width;
98     }
height()99     unsigned height() const
100     {
101         return m_height;
102     }
stride()103     int      stride() const
104     {
105         return m_stride;
106     }
stride_abs()107     unsigned stride_abs() const
108     {
109         return (m_stride < 0) ?
110                unsigned(-m_stride) :
111                unsigned(m_stride);
112     }
row(unsigned y)113     int8u* row(unsigned y)
114     {
115         return m_rows[y];
116     }
row(unsigned y)117     const int8u* row(unsigned y) const
118     {
119         return m_rows[y];
120     }
next_row(void * p)121     int8u* next_row(void* p)
122     {
123         return (int8u*)p + m_stride;
124     }
next_row(const void * p)125     const int8u* next_row(const void* p) const
126     {
127         return (int8u*)p + m_stride;
128     }
rows()129     int8u const* const* rows() const
130     {
131         return m_rows;
132     }
133 private:
134     rendering_buffer(const rendering_buffer&);
135     const rendering_buffer& operator = (const rendering_buffer&);
136 private:
137     int8u*       m_buf;
138     int8u**      m_rows;
139     unsigned m_width;
140     unsigned m_height;
141     int      m_stride;
142     unsigned m_max_height;
143 };
144 }
145 #endif
146