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resize.go
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resize.go
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package image
import (
"fmt"
"image"
"log"
"sync"
"golang.org/x/image/draw"
"github.com/kalogs-c/resizenator/semaphore"
)
type Algorithm string
const (
BiLinear Algorithm = "BiLinear"
ApproxBiLinear Algorithm = "ApproxBiLinear"
CatmullRom Algorithm = "CatmullRom"
NearestNeighbor Algorithm = "NearestNeighbor"
)
func resizeImage(
originalImage image.Image,
desiredSize ImageSize,
algorithm Algorithm,
) image.Image {
originalImageBounds := originalImage.Bounds()
scale := desiredSize.GetScales(originalImageBounds)
destinationImageWidth := int(float64(originalImageBounds.Dx()) / scale)
destinationImageHeight := int(float64(originalImageBounds.Dy()) / scale)
destinationRect := image.Rect(0, 0, destinationImageWidth, destinationImageHeight)
destinationImage := image.NewRGBA(destinationRect)
switch algorithm {
case "BiLinear":
draw.BiLinear.Scale(
destinationImage,
destinationImage.Bounds(),
originalImage,
originalImageBounds,
draw.Over,
nil,
)
case "ApproxBiLinear":
draw.ApproxBiLinear.Scale(
destinationImage,
destinationImage.Bounds(),
originalImage,
originalImageBounds,
draw.Over,
nil,
)
case "CatmullRom":
draw.CatmullRom.Scale(
destinationImage,
destinationImage.Bounds(),
originalImage,
originalImageBounds,
draw.Over,
nil,
)
case "NearestNeighbor":
draw.NearestNeighbor.Scale(
destinationImage,
destinationImage.Bounds(),
originalImage,
originalImageBounds,
draw.Over,
nil,
)
default:
log.Fatalln("Algorithm not supported")
}
return destinationImage
}
func ResizeImageToChan(
imageChan chan<- image.Image,
semaphore semaphore.Semaphore,
wg *sync.WaitGroup,
originalImage image.Image,
destinationImage ImageSize,
algorithm Algorithm,
) {
imageChan <- resizeImage(originalImage, destinationImage, algorithm)
semaphore.Release()
wg.Done()
}
func ResizeMonitor(imageChan chan image.Image, wg *sync.WaitGroup) {
wg.Wait()
close(imageChan)
fmt.Println("Done")
}