vendor dependencies, make some changes to how input is done

vendor/github.com/hajimehoshi/ebiten/v2/internal/atlas/set.go

@@ -0,0 +1,69 @@
+// 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]
+}