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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/*
* This code is based on Libart_LGPL - library of basic graphic primitives
*
* Copyright (c) 1998 Raph Levien
*
* Licensed under GNU LGPL v2
*
*/
/* Simple macros to set up storage allocation and basic types for libart
functions. */
#ifndef __ART_H__
#define __ART_H__
#include "common/scummsys.h"
namespace Sword25 {
/* These aren't, strictly speaking, configuration macros, but they're
damn handy to have around, and may be worth playing with for
debugging. */
#define art_new(type, n) ((type *)malloc ((n) * sizeof(type)))
#define art_renew(p, type, n) ((type *)realloc (p, (n) * sizeof(type)))
/* This one must be used carefully - in particular, p and max should
be variables. They can also be pstruct->el lvalues. */
#define art_expand(p, type, max) \
do { \
if (max) {\
type *tmp = art_renew(p, type, max <<= 1); \
if (!tmp) error("Cannot reallocate memory for art data"); \
p = tmp; \
} else { \
max = 1; \
p = art_new(type, 1); \
if (!p) error("Cannot allocate memory for art data"); \
} \
} while (0)
struct ArtDRect {
/*< public >*/
double x0, y0, x1, y1;
};
struct ArtPoint {
/*< public >*/
double x, y;
};
/* Basic data structures and constructors for sorted vector paths */
struct ArtSVPSeg {
int n_points;
int dir; /* == 0 for "up", 1 for "down" */
ArtDRect bbox;
ArtPoint *points;
};
struct ArtSVP {
int n_segs;
ArtSVPSeg segs[1];
};
void art_svp_free(ArtSVP *svp);
int art_svp_seg_compare(const void *s1, const void *s2);
/* Basic data structures and constructors for bezier paths */
enum ArtPathcode {
ART_MOVETO,
ART_MOVETO_OPEN,
ART_CURVETO,
ART_LINETO,
ART_END
};
struct ArtBpath {
/*< public >*/
ArtPathcode code;
double x1;
double y1;
double x2;
double y2;
double x3;
double y3;
};
/* Basic data structures and constructors for simple vector paths */
/* CURVETO is not allowed! */
struct ArtVpath {
ArtPathcode code;
double x;
double y;
};
/* Some of the functions need to go into their own modules */
void art_vpath_add_point(ArtVpath **p_vpath, int *pn_points, int *pn_points_max,
ArtPathcode code, double x, double y);
ArtVpath *art_bez_path_to_vec(const ArtBpath *bez, double flatness);
/* The funky new SVP intersector. */
#ifndef ART_WIND_RULE_DEFINED
#define ART_WIND_RULE_DEFINED
enum ArtWindRule {
ART_WIND_RULE_NONZERO,
ART_WIND_RULE_INTERSECT,
ART_WIND_RULE_ODDEVEN,
ART_WIND_RULE_POSITIVE
};
#endif
struct ArtSvpWriter {
int (*add_segment)(ArtSvpWriter *self, int wind_left, int delta_wind,
double x, double y);
void (*add_point)(ArtSvpWriter *self, int seg_id, double x, double y);
void (*close_segment)(ArtSvpWriter *self, int seg_id);
};
ArtSvpWriter *art_svp_writer_rewind_new(ArtWindRule rule);
ArtSVP *art_svp_writer_rewind_reap(ArtSvpWriter *self);
int art_svp_seg_compare(const void *s1, const void *s2);
void art_svp_intersector(const ArtSVP *in, ArtSvpWriter *out);
/* Sort vector paths into sorted vector paths. */
ArtSVP *art_svp_from_vpath(ArtVpath *vpath);
/* Sort vector paths into sorted vector paths. */
enum ArtPathStrokeJoinType {
ART_PATH_STROKE_JOIN_MITER,
ART_PATH_STROKE_JOIN_ROUND,
ART_PATH_STROKE_JOIN_BEVEL
};
enum ArtPathStrokeCapType {
ART_PATH_STROKE_CAP_BUTT,
ART_PATH_STROKE_CAP_ROUND,
ART_PATH_STROKE_CAP_SQUARE
};
ArtSVP *art_svp_vpath_stroke(ArtVpath *vpath,
ArtPathStrokeJoinType join,
ArtPathStrokeCapType cap,
double line_width,
double miter_limit,
double flatness);
/* This version may have winding numbers exceeding 1. */
ArtVpath *art_svp_vpath_stroke_raw(ArtVpath *vpath,
ArtPathStrokeJoinType join,
ArtPathStrokeCapType cap,
double line_width,
double miter_limit,
double flatness);
/* The spiffy antialiased renderer for sorted vector paths. */
struct ArtSVPRenderAAStep {
int x;
int delta; /* stored with 16 fractional bits */
};
struct ArtSVPRenderAAIter;
ArtSVPRenderAAIter *art_svp_render_aa_iter(const ArtSVP *svp,
int x0, int y0, int x1, int y1);
void art_svp_render_aa_iter_step(ArtSVPRenderAAIter *iter, int *p_start,
ArtSVPRenderAAStep **p_steps, int *p_n_steps);
void art_svp_render_aa_iter_done(ArtSVPRenderAAIter *iter);
void art_svp_render_aa(const ArtSVP *svp,
int x0, int y0, int x1, int y1,
void (*callback)(void *callback_data,
int y,
int start,
ArtSVPRenderAAStep *steps, int n_steps),
void *callback_data);
} // End of namespace Sword25
#endif /* __ART_H__ */
|
