mirror of
https://github.com/Dadido3/noita-mapcap.git
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58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
// Copyright (c) 2019 David Vogel
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//
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// This software is released under the MIT License.
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// https://opensource.org/licenses/MIT
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package main
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import (
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"fmt"
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"image"
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_ "image/png"
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"os"
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)
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type imageTile struct {
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fileName string
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originalRect image.Rectangle // Rectangle of the original position. Determined by the file name, the real coordinates may differ a few pixels.
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image image.Image // Either a rectangle or an RGBA image. The bounds of this image represent the real and corrected coordinates.
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}
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func (it *imageTile) loadImage() error {
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// Check if the image is already loaded
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if _, ok := it.image.(*image.RGBA); ok {
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return nil
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}
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// Store rectangle of the old image
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oldRect := it.image.Bounds()
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file, err := os.Open(it.fileName)
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if err != nil {
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return err
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}
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defer file.Close()
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img, _, err := image.Decode(file)
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if err != nil {
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return err
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}
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imgRGBA, ok := img.(*image.RGBA)
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if !ok {
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return fmt.Errorf("Expected an RGBA image, got %T instead", img)
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}
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// Restore the position of the image rectangle
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imgRGBA.Rect = imgRGBA.Rect.Add(oldRect.Min)
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it.image = imgRGBA
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return nil
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}
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func (it *imageTile) unloadImage() {
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it.image = it.image.Bounds()
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}
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