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
// 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/.
use std::f64;
use super::prelude::*;
pub fn fix_gradient_stops(doc: &mut Document) {
let gradients: Vec<_> = doc.root().descendants().filter(|n| n.is_gradient()).collect();
// Remove any non-`stop` children, so we can skip tag name checks in the code below.
for grad in &gradients {
let mut stop_opt = grad.first_child();
while let Some(stop) = stop_opt {
stop_opt = stop.next_sibling();
if !stop.is_tag_name(EId::Stop) {
doc.remove_node(stop);
}
}
}
// Clamp offsets.
for grad in &gradients {
for mut stop in grad.children() {
let mut attrs = stop.attributes_mut();
let av = attrs.get_value_mut(AId::Offset);
if let Some(&mut AValue::Number(ref mut offset)) = av {
*offset = f64_bound(0.0, *offset, 1.0);
}
}
}
// Remove stops with equal offset.
//
// Example:
// offset="0.5"
// offset="0.7"
// offset="0.7" <-- this one should be removed
// offset="0.7"
// offset="0.9"
let mut stops = Vec::new();
for grad in &gradients {
stops.clear();
for stop in grad.children() {
stops.push(stop);
}
if stops.len() < 3 {
continue;
}
let mut i = 0;
while i < stops.len() - 2 {
let offset1 = stops[i + 0].attributes().get_number_or(AId::Offset, 0.0);
let offset2 = stops[i + 1].attributes().get_number_or(AId::Offset, 0.0);
let offset3 = stops[i + 2].attributes().get_number_or(AId::Offset, 0.0);
if offset1.fuzzy_eq(&offset2) && offset2.fuzzy_eq(&offset3) {
// Remove offset in the middle.
doc.remove_node(stops[i + 1].clone());
stops.remove(1);
} else {
i += 1;
}
}
}
// Shift equal offsets.
//
// From:
// offset="0.5"
// offset="0.7"
// offset="0.7"
//
// To:
// offset="0.5"
// offset="0.699999999"
// offset="0.7"
for grad in &gradients {
let mut prev_offset = 0.0;
for mut stop in grad.children() {
let mut offset = stop.attributes().get_number_or(AId::Offset, 0.0);
if offset.is_fuzzy_zero() {
prev_offset = 0.0;
continue;
}
// Next offset must be smaller then previous.
if offset < prev_offset || offset.fuzzy_eq(&prev_offset) {
if let Some(mut prev_stop) = stop.previous_sibling() {
// Make previous offset a bit smaller.
let new_offset = prev_offset - f64::EPSILON;
prev_stop.set_attribute((AId::Offset, new_offset));
}
offset = prev_offset;
}
stop.set_attribute((AId::Offset, offset));
prev_offset = offset;
}
}
// Remove zeros.
//
// From:
// offset="0.0"
// offset="0.0"
// offset="0.7"
//
// To:
// offset="0.0"
// offset="0.00000001"
// offset="0.7"
for grad in &gradients {
stops.clear();
for stop in grad.children() {
stops.push(stop);
}
while stops.len() >= 2 {
let offset1 = stops[0].attributes().get_number_or(AId::Offset, 0.0);
let offset2 = stops[1].attributes().get_number_or(AId::Offset, 0.0);
if offset1.is_fuzzy_zero() && offset2.is_fuzzy_zero() {
stops[1].set_attribute((AId::Offset, offset1 + f64::EPSILON));
} else {
break;
}
}
}
}