-
-
Notifications
You must be signed in to change notification settings - Fork 647
/
set.go
69 lines (60 loc) · 1.64 KB
/
set.go
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
// Copyright 2023 The Ebitengine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package atlas
// smallImageSet is a set for images.
// smallImageSet uses a slice assuming the number of items is not so big (smaller than 100 or so).
// If the number of items is big, a map might be better than a slice.
type smallImageSet struct {
s []*Image
tmp []*Image
}
func (s *smallImageSet) add(image *Image) {
if image == nil {
panic("atlas: nil image cannot be added")
}
for _, img := range s.s {
if img == image {
return
}
}
s.s = append(s.s, image)
}
func (s *smallImageSet) remove(image *Image) {
for i, img := range s.s {
if img == image {
copy(s.s[i:], s.s[i+1:])
s.s[len(s.s)-1] = nil
s.s = s.s[:len(s.s)-1]
return
}
}
}
func (s *smallImageSet) forEach(f func(*Image)) {
// Copy images to a temporary buffer since f might modify the original slice s.s (#2729).
s.tmp = append(s.tmp, s.s...)
for _, img := range s.tmp {
f(img)
}
// Clear the temporary buffer.
for i := range s.tmp {
s.tmp[i] = nil
}
s.tmp = s.tmp[:0]
}
func (s *smallImageSet) clear() {
for i := range s.s {
s.s[i] = nil
}
s.s = s.s[:0]
}