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
|
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//! Some useful utilities.
use std::f64;
// external
use usvg;
use usvg::prelude::*;
pub use usvg::utils::*;
// self
use geom::*;
use FitTo;
/// Returns `size` preprocessed according to `FitTo`.
pub fn fit_to(size: ScreenSize, fit: FitTo) -> ScreenSize {
let sizef = size.to_size();
match fit {
FitTo::Original => {
size
}
FitTo::Width(w) => {
let h = (w as f64 * sizef.height / sizef.width).ceil();
ScreenSize::new(w, h as u32)
}
FitTo::Height(h) => {
let w = (h as f64 * sizef.width / sizef.height).ceil();
ScreenSize::new(w as u32, h)
}
FitTo::Zoom(z) => {
Size::new(sizef.width * z as f64, sizef.height * z as f64).to_screen_size()
}
}
}
pub(crate) fn apply_view_box(vb: &usvg::ViewBox, img_size: ScreenSize) -> ScreenSize {
if vb.aspect.align == usvg::Align::None {
vb.rect.to_screen_size()
} else {
if vb.aspect.slice {
img_size.expand_to(vb.rect.to_screen_size())
} else {
img_size.scale_to(vb.rect.to_screen_size())
}
}
}
/// Returns node's absolute transform.
///
/// Does not include the node's transform itself.
pub fn abs_transform(
node: &usvg::Node,
) -> usvg::Transform {
let mut ts_list = Vec::new();
for p in node.ancestors().skip(1) {
ts_list.push(p.transform());
}
let mut root_ts = usvg::Transform::default();
for ts in ts_list.iter().rev() {
root_ts.append(ts);
}
root_ts
}
/// Calculates path's bounding box.
///
/// Minimum size is 1x1.
pub fn path_bbox(
segments: &[usvg::PathSegment],
stroke: Option<&usvg::Stroke>,
ts: &usvg::Transform,
) -> Rect {
debug_assert!(!segments.is_empty());
use lyon_geom;
let mut path_buf;
let new_path = if !ts.is_default() {
// Clone only when transform is required.
path_buf = segments.to_vec();
transform_path(&mut path_buf, ts);
&path_buf
} else {
segments
};
let (mut prev_x, mut prev_y, mut minx, mut miny, mut maxx, mut maxy) = {
if let usvg::PathSegment::MoveTo { x, y } = new_path[0] {
(x as f32, y as f32, x as f32, y as f32, x as f32, y as f32)
} else {
unreachable!();
}
};
for seg in new_path {
match *seg {
usvg::PathSegment::MoveTo { x, y }
| usvg::PathSegment::LineTo { x, y } => {
let x = x as f32;
let y = y as f32;
prev_x = x;
prev_y = y;
if x > maxx { maxx = x; }
else if x < minx { minx = x; }
if y > maxy { maxy = y; }
else if y < miny { miny = y; }
}
usvg::PathSegment::CurveTo { x1, y1, x2, y2, x, y } => {
let x = x as f32;
let y = y as f32;
let curve = lyon_geom::CubicBezierSegment {
from: lyon_geom::math::Point::new(prev_x, prev_y),
ctrl1: lyon_geom::math::Point::new(x1 as f32, y1 as f32),
ctrl2: lyon_geom::math::Point::new(x2 as f32, y2 as f32),
to: lyon_geom::math::Point::new(x, y),
};
prev_x = x;
prev_y = y;
let r = curve.bounding_rect();
let right = r.max_x();
let bottom = r.max_y();
if r.min_x() < minx { minx = r.min_x(); }
if right > maxx { maxx = right; }
if r.min_y() < miny { miny = r.min_y(); }
if bottom > maxy { maxy = bottom; }
}
usvg::PathSegment::ClosePath => {}
}
}
// TODO: find a better way
// It's an approximation, but it's better than nothing.
if let Some(ref stroke) = stroke {
let w = (stroke.width.value() / 2.0) as f32;
minx -= w;
miny -= w;
maxx += w;
maxy += w;
}
let mut width = maxx - minx;
if width < 1.0 { width = 1.0; }
let mut height = maxy - miny;
if height < 1.0 { height = 1.0; }
(minx as f64, miny as f64, width as f64, height as f64).into()
}
/// Applies the transform to the path segments.
pub fn transform_path(segments: &mut [usvg::PathSegment], ts: &usvg::Transform) {
for seg in segments {
match *seg {
usvg::PathSegment::MoveTo { ref mut x, ref mut y } => {
ts.apply_to(x, y);
}
usvg::PathSegment::LineTo { ref mut x, ref mut y } => {
ts.apply_to(x, y);
}
usvg::PathSegment::CurveTo { ref mut x1, ref mut y1, ref mut x2,
ref mut y2, ref mut x, ref mut y } => {
ts.apply_to(x1, y1);
ts.apply_to(x2, y2);
ts.apply_to(x, y);
}
usvg::PathSegment::ClosePath => {}
}
}
}
/// Converts `rect` to path segments.
pub fn rect_to_path(rect: Rect) -> Vec<usvg::PathSegment> {
vec![
usvg::PathSegment::MoveTo {
x: rect.x, y: rect.y
},
usvg::PathSegment::LineTo {
x: rect.x + rect.width, y: rect.y
},
usvg::PathSegment::LineTo {
x: rect.x + rect.width, y: rect.y + rect.height
},
usvg::PathSegment::LineTo {
x: rect.x, y: rect.y + rect.height
},
usvg::PathSegment::ClosePath,
]
}
|
