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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "agg_ellipse.h"
#include "agg_trans_affine.h"
#include "agg_conv_transform.h"
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgb.h"
#include "agg_span_allocator.h"
#include "agg_span_image_filter_rgb.h"
#include "agg_image_accessors.h"
#include "agg_span_interpolator_linear.h"
#include "agg_span_converter.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_rasterizer_scanline_aa.h"
#include "ctrl/agg_spline_ctrl.h"
#include "platform/agg_platform_support.h"
enum flip_y_e { flip_y = true };
namespace agg
{
//--------------------------------------------------------------------
class span_conv_brightness_alpha_rgb8
{
public:
typedef rgba8 color_type;
typedef int8u alpha_type;
enum array_size_e
{
array_size = 256 * 3
};
span_conv_brightness_alpha_rgb8(const alpha_type* alpha_array) :
m_alpha_array(alpha_array)
{
}
void prepare() {}
void generate(color_type* span, int x, int y, unsigned len) const
{
do
{
span->a = m_alpha_array[span->r + span->g + span->b];
++span;
}
while(--len);
}
private:
const alpha_type* m_alpha_array;
};
}
class the_application : public agg::platform_support
{
agg::spline_ctrl<agg::rgba8> m_alpha;
double m_x[50];
double m_y[50];
double m_rx[50];
double m_ry[50];
agg::rgba8 m_colors[50];
public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_alpha(2, 2, 200, 30, 6, !flip_y)
{
m_alpha.value(0, 1.0);
m_alpha.value(1, 1.0);
m_alpha.value(2, 1.0);
m_alpha.value(3, 0.5);
m_alpha.value(4, 0.5);
m_alpha.value(5, 1.0);
m_alpha.update_spline();
add_ctrl(m_alpha);
}
virtual ~the_application()
{
}
virtual void on_init()
{
unsigned i;
for(i = 0; i < 50; i++)
{
m_x[i] = rand() % int(width());
m_y[i] = rand() % int(height());
m_rx[i] = rand() % 60 + 10;
m_ry[i] = rand() % 60 + 10;
m_colors[i] = agg::rgba8(rand() & 0xFF,
rand() & 0xFF,
rand() & 0xFF,
rand() & 0xFF);
}
}
virtual void on_draw()
{
typedef agg::pixfmt_bgr24 pixfmt;
typedef agg::renderer_base<pixfmt> renderer_base;
pixfmt pixf(rbuf_window());
renderer_base rb(pixf);
rb.clear(agg::rgba(1.0, 1.0, 1.0));
agg::trans_affine src_mtx;
src_mtx *= agg::trans_affine_translation(-initial_width()/2, -initial_height()/2);
src_mtx *= agg::trans_affine_rotation(10.0 * agg::pi / 180.0);
src_mtx *= agg::trans_affine_translation(initial_width()/2, initial_height()/2);
src_mtx *= trans_affine_resizing();
agg::trans_affine img_mtx = src_mtx;
img_mtx.invert();
typedef agg::span_allocator<agg::rgba8> span_alloc;
unsigned i;
unsigned char brightness_alpha_array[agg::span_conv_brightness_alpha_rgb8::array_size];
for(i = 0; i < agg::span_conv_brightness_alpha_rgb8::array_size; i++)
{
brightness_alpha_array[i] =
agg::int8u(m_alpha.value(double(i) /
double(agg::span_conv_brightness_alpha_rgb8::array_size)) * 255.0);
}
agg::span_conv_brightness_alpha_rgb8 color_alpha(brightness_alpha_array);
typedef agg::image_accessor_clip<pixfmt> img_source_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_image_filter_rgb_bilinear<img_source_type,
interpolator_type> span_gen;
typedef agg::span_converter<span_gen,
agg::span_conv_brightness_alpha_rgb8> span_conv;
span_alloc sa;
interpolator_type interpolator(img_mtx);
pixfmt img_pixf(rbuf_img(0));
img_source_type img_src(img_pixf, agg::rgba(0,0,0,0));
span_gen sg(img_src, interpolator);
span_conv sc(sg, color_alpha);
agg::ellipse ell;
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
for(i = 0; i < 50; i++)
{
ell.init(m_x[i], m_y[i], m_rx[i], m_ry[i], 50);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, rb, m_colors[i]);
}
ell.init(initial_width() / 2.0,
initial_height() / 2.0,
initial_width() / 1.9,
initial_height() / 1.9, 200);
agg::conv_transform<agg::ellipse> tr(ell, src_mtx);
ras.add_path(tr);
agg::render_scanlines_aa(ras, sl, rb, sa, sc);
agg::render_ctrl(ras, sl, rb, m_alpha);
}
virtual void on_key(int x, int y, unsigned key, unsigned flags)
{
if(key == ' ')
{
FILE* fd = fopen(full_file_name("alpha"), "w");
int i;
for(i = 0; i < agg::span_conv_brightness_alpha_rgb8::array_size; i++)
{
int alpha =
agg::int8u(m_alpha.value(double(i) /
double(agg::span_conv_brightness_alpha_rgb8::array_size)) * 255.0);
if(i % 32 == 0) fprintf(fd, "\n");
fprintf(fd, "%3d, ", alpha);
}
fclose(fd);
}
}
};
int agg_main(int argc, char* argv[])
{
the_application app(agg::pix_format_bgr24, flip_y);
app.caption("Image Affine Transformations with Alpha-function");
const char* img_name = "spheres";
if(argc >= 2) img_name = argv[1];
if(!app.load_img(0, img_name))
{
char buf[256];
if(strcmp(img_name, "spheres") == 0)
{
sprintf(buf, "File not found: %s%s. Download http://www.antigrain.com/%s%s\n"
"or copy it from another directory if available.",
img_name, app.img_ext(), img_name, app.img_ext());
}
else
{
sprintf(buf, "File not found: %s%s", img_name, app.img_ext());
}
app.message(buf);
return 1;
}
if(app.init(app.rbuf_img(0).width(), app.rbuf_img(0).height(), agg::window_resize))
{
return app.run();
}
return 0;
}
|
