mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-30 21:58:53 +01:00
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
// 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]
|
|
}
|