noita-mapcap/bin/stitch/image-tiles.go

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// Copyright (c) 2019-2023 David Vogel
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT
package main
import (
"fmt"
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"image"
"path/filepath"
)
type ImageTiles []ImageTile
// LoadImageTiles "loads" all images in the directory at the given path.
func LoadImageTiles(path string, scaleDivider int) (ImageTiles, error) {
if scaleDivider < 1 {
return nil, fmt.Errorf("invalid scale of %v", scaleDivider)
}
var imageTiles ImageTiles
files, err := filepath.Glob(filepath.Join(path, "*.png"))
if err != nil {
return nil, err
}
for _, file := range files {
imageTile, err := NewImageTile(file, scaleDivider)
if err != nil {
return nil, err
}
imageTiles = append(imageTiles, imageTile)
}
return imageTiles, nil
}
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// InvalidateAboveY invalidates all cached images that have no pixel at the given y coordinate or below.
func (it ImageTiles) Bounds() image.Rectangle {
totalBounds := image.Rectangle{}
for i, tile := range it {
if i == 0 {
totalBounds = tile.Bounds()
} else {
totalBounds = totalBounds.Union(tile.Bounds())
}
}
return totalBounds
}
// InvalidateAboveY invalidates all cached images that have no pixel at the given y coordinate or below.
func (it ImageTiles) InvalidateAboveY(y int) {
for i := range it {
tile := &it[i] // Need to copy a reference.
if tile.Bounds().Max.Y <= y {
tile.Invalidate()
}
}
}