mirror of
https://github.com/Dadido3/noita-mapcap.git
synced 2024-11-22 21:17:33 +00:00
114 lines
2.6 KiB
Go
114 lines
2.6 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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"sync"
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"time"
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"github.com/nfnt/resize"
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)
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type imageTile struct {
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fileName string
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scaleDivider int // Downscales the coordinates and images on the fly.
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offset image.Point // Correction offset of the image, so that it aligns pixel perfect with other images. Determined by image matching.
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image image.Image // Either a rectangle or an RGBA image. The bounds of this image are determined by the filename.
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imageMutex *sync.RWMutex //
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imageUsedFlag bool // Flag signalling, that the image was used recently
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pixelErrorSum uint64 // Sum of the difference between the (sub)pixels of all overlapping images. 0 Means that all overlapping images are identical.
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}
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func (it *imageTile) GetImage() (*image.RGBA, error) {
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it.imageMutex.RLock()
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it.imageUsedFlag = true // Race condition may happen on this flag, but doesn't matter here.
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// Check if the image is already loaded
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if img, ok := it.image.(*image.RGBA); ok {
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it.imageMutex.RUnlock()
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return img, nil
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}
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it.imageMutex.RUnlock()
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// It's possible that the image got changed in between here
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it.imageMutex.Lock()
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defer it.imageMutex.Unlock()
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// Check again if the image is already loaded
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if img, ok := it.image.(*image.RGBA); ok {
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return img, 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 &image.RGBA{}, 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 &image.RGBA{}, err
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}
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if it.scaleDivider > 1 {
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img = resize.Resize(uint(oldRect.Dx()), uint(oldRect.Dy()), img, resize.NearestNeighbor)
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}
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imgRGBA, ok := img.(*image.RGBA)
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if !ok {
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return &image.RGBA{}, 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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// Free the image after some time
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go func() {
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for it.imageUsedFlag {
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time.Sleep(1 * time.Second)
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it.imageUsedFlag = false
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}
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it.imageMutex.Lock()
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defer it.imageMutex.Unlock()
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it.image = it.image.Bounds()
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}()
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return imgRGBA, nil
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}
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func (it *imageTile) OffsetBounds() image.Rectangle {
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it.imageMutex.RLock()
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defer it.imageMutex.RUnlock()
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return it.image.Bounds().Add(it.offset)
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}
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func (it *imageTile) Bounds() image.Rectangle {
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it.imageMutex.RLock()
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defer it.imageMutex.RUnlock()
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return it.image.Bounds()
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}
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func (it *imageTile) String() string {
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return fmt.Sprintf("<ImageTile \"%v\">", it.fileName)
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}
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