noita-mapcap/bin/stitch/imagetile.go

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2019-10-21 00:07:39 +00:00
// Copyright (c) 2019 David Vogel
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT
package main
import (
"fmt"
"image"
_ "image/png"
"os"
)
type imageTile struct {
fileName string
offset image.Point // Correction offset of the image, so that it aligns pixel perfect with other images. Determined by image matching.
image image.Image // Either a rectangle or an RGBA image. The bounds of this image are determined by the filename.
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}
func (it *imageTile) loadImage() error {
// Check if the image is already loaded
if _, ok := it.image.(*image.RGBA); ok {
return nil
}
// Store rectangle of the old image
oldRect := it.image.Bounds()
file, err := os.Open(it.fileName)
if err != nil {
return err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return err
}
imgRGBA, ok := img.(*image.RGBA)
if !ok {
return fmt.Errorf("Expected an RGBA image, got %T instead", img)
}
// Restore the position of the image rectangle
imgRGBA.Rect = imgRGBA.Rect.Add(oldRect.Min)
it.image = imgRGBA
return nil
}
func (it *imageTile) unloadImage() {
it.image = it.image.Bounds()
}
func (it *imageTile) String() string {
return fmt.Sprintf("<ImageTile \"%v\">", it.fileName)
}