1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
//
// Adaptation for high precision colors has been sponsored by
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
//----------------------------------------------------------------------------
#ifndef AGG_SPAN_GOURAUD_RGBA_INCLUDED
#define AGG_SPAN_GOURAUD_RGBA_INCLUDED
#include "agg_basics.h"
#include "agg_color_rgba.h"
#include "agg_dda_line.h"
#include "agg_span_gouraud.h"
namespace agg
{
//=======================================================span_gouraud_rgba
template<class ColorT, class Allocator = span_allocator<ColorT> >
class span_gouraud_rgba : public span_gouraud<ColorT, Allocator>
{
public:
typedef Allocator alloc_type;
typedef ColorT color_type;
typedef typename ColorT::value_type value_type;
typedef span_gouraud<color_type, alloc_type> base_type;
typedef typename base_type::coord_type coord_type;
private:
//--------------------------------------------------------------------
struct rgba_calc
{
void init(const coord_type& c1, const coord_type& c2)
{
m_x1 = c1.x;
m_y1 = c1.y;
m_dx = c2.x - c1.x;
m_dy = 1.0 / (c2.y - c1.y);
m_r1 = c1.color.r;
m_g1 = c1.color.g;
m_b1 = c1.color.b;
m_a1 = c1.color.a;
m_dr = c2.color.r - m_r1;
m_dg = c2.color.g - m_g1;
m_db = c2.color.b - m_b1;
m_da = c2.color.a - m_a1;
}
void calc(int y)
{
double k = 0.0;
if(y > m_y1) k = (y - m_y1) * m_dy;
color_type rgba;
m_r = m_r1 + int(m_dr * k);
m_g = m_g1 + int(m_dg * k);
m_b = m_b1 + int(m_db * k);
m_a = m_a1 + int(m_da * k);
m_x = int(m_x1 + m_dx * k);
}
double m_x1;
double m_y1;
double m_dx;
double m_dy;
int m_r1;
int m_g1;
int m_b1;
int m_a1;
int m_dr;
int m_dg;
int m_db;
int m_da;
int m_r;
int m_g;
int m_b;
int m_a;
int m_x;
};
public:
//--------------------------------------------------------------------
span_gouraud_rgba(alloc_type& alloc) : base_type(alloc) {}
//--------------------------------------------------------------------
span_gouraud_rgba(alloc_type& alloc,
const color_type& c1,
const color_type& c2,
const color_type& c3,
double x1, double y1,
double x2, double y2,
double x3, double y3,
double d = 0) :
base_type(alloc, c1, c2, c3, x1, y1, x2, y2, x3, y3, d)
{}
//--------------------------------------------------------------------
void prepare(unsigned max_span_len)
{
base_type::prepare(max_span_len);
coord_type coord[3];
arrange_vertices(coord);
m_y2 = int(coord[1].y);
m_swap = calc_point_location(coord[0].x, coord[0].y,
coord[2].x, coord[2].y,
coord[1].x, coord[1].y) < 0.0;
m_rgba1.init(coord[0], coord[2]);
m_rgba2.init(coord[0], coord[1]);
m_rgba3.init(coord[1], coord[2]);
}
//--------------------------------------------------------------------
color_type* generate(int x, int y, unsigned len)
{
m_rgba1.calc(y);
const rgba_calc* pc1 = &m_rgba1;
const rgba_calc* pc2 = &m_rgba2;
if(y < m_y2)
{
m_rgba2.calc(y+1);
}
else
{
m_rgba3.calc(y);
pc2 = &m_rgba3;
}
if(m_swap)
{
const rgba_calc* t = pc2;
pc2 = pc1;
pc1 = t;
}
int nx = pc1->m_x;
unsigned nlen = pc2->m_x - pc1->m_x + 1;
if(nlen < len) nlen = len;
dda_line_interpolator<14> r(pc1->m_r, pc2->m_r, nlen);
dda_line_interpolator<14> g(pc1->m_g, pc2->m_g, nlen);
dda_line_interpolator<14> b(pc1->m_b, pc2->m_b, nlen);
dda_line_interpolator<14> a(pc1->m_a, pc2->m_a, nlen);
if(nx < x)
{
unsigned d = unsigned(x - nx);
r += d;
g += d;
b += d;
a += d;
}
color_type* span = base_type::allocator().span();
do
{
span->r = (value_type)r.y();
span->g = (value_type)g.y();
span->b = (value_type)b.y();
span->a = (value_type)a.y();
++r;
++g;
++b;
++a;
++span;
}
while(--len);
return base_type::allocator().span();
}
private:
bool m_swap;
int m_y2;
rgba_calc m_rgba1;
rgba_calc m_rgba2;
rgba_calc m_rgba3;
};
}
#endif
|
