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