adminoo/pixelweaver
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resize picture based on specified dimensions

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adminoo
2022-05-01 15:33:55 +02:00
parent b0e7cbbd2f
commit 1138d11923
3 changed files with 59 additions and 7 deletions
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40
blend.go
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@ -85,12 +85,19 @@ func (p *blendWorkerPool) SetImageWorker(newImage *image.RGBA) {
func (p *blendWorkerPool) BlendImages(img1 image.Image, img2 image.Image) {
log.Println("Blending the images...")
dimensions := getDimensions(img1, img2)
// dimensions := getMaxDimensions(img1, img2)
// output image, ready to receive pixel values
dimensions := dimensionsToRectangle(ConfigRegister.OutputWidth, ConfigRegister.OutputHeight)
outImg := image.NewRGBA(dimensions)
// TODO: use a worker pool for those operations ?
// resize image
img1Resized := resize(img1)
img2Resized := resize(img2)
p.RunWorkers(outImg)
p.SendBlendJobs(dimensions, img1, img2)
p.SendBlendJobs(dimensions, img1Resized, img2Resized)
// first waitgroup to wait for the results to be ready before closing the channel
p.WorkerWG.Wait()
@ -166,7 +173,7 @@ func blendColor(color1 color.Color, color2 color.Color) color.Color {
}
// creates a new rectangle with the min height and width from both images
func getDimensions(img1 image.Image, img2 image.Image) image.Rectangle {
func getMaxDimensions(img1 image.Image, img2 image.Image) image.Rectangle {
// get dimensions for both images
size1 := img1.Bounds().Size()
size2 := img2.Bounds().Size()
@ -181,3 +188,30 @@ func getDimensions(img1 image.Image, img2 image.Image) image.Rectangle {
return image.Rectangle{upLeft, lowRight}
}
// resizes image using dimensions from config register (nearest neighbour interpolation)
func resize(img image.Image) (resized *image.RGBA) {
imgSize := img.Bounds().Size()
dimensions := dimensionsToRectangle(ConfigRegister.OutputWidth, ConfigRegister.OutputHeight)
xscale := float64(imgSize.X) / float64(dimensions.Max.X)
yscale := float64(imgSize.Y) / float64(dimensions.Max.Y)
// creates new rescaled image based on a given image dimensions
resized = image.NewRGBA(dimensions)
// get pixels from the original image
for x := 0; x < dimensions.Max.X; x++ {
for y := 0; y < dimensions.Max.Y; y++ {
xp := int(math.Floor(float64(x) * xscale))
yp := int(math.Floor(float64(y) * yscale))
pixel := img.At(xp, yp)
resized.Set(x, y, pixel)
}
}
return
}
// returns a Rectangle of dimensions <width>x<height>
func dimensionsToRectangle(width int, height int) image.Rectangle {
upLeft := image.Point{0, 0}
lowRight := image.Point{width, height}
return image.Rectangle{upLeft, lowRight}
}