51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
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package main
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import (
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"image"
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"math"
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)
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// creates a new rectangle with the min height and width from both images
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func getMaxDimensions(img1 image.Image, img2 image.Image) image.Rectangle {
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// get dimensions for both images
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size1 := img1.Bounds().Size()
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size2 := img2.Bounds().Size()
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// final image sized from lowest width and height
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width := int(math.Min(float64(size1.X), float64(size2.X)))
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height := int(math.Min(float64(size1.Y), float64(size2.Y)))
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// the dimensions, as Points, of the output image
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upLeft := image.Point{0, 0}
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lowRight := image.Point{width, height}
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return image.Rectangle{upLeft, lowRight}
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}
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// resizes image using dimensions from config register (nearest neighbour interpolation)
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func resize(img image.Image) (resized *image.RGBA) {
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imgSize := img.Bounds().Size()
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dimensions := dimensionsToRectangle(ConfigRegister.OutputWidth, ConfigRegister.OutputHeight)
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xscale := float64(imgSize.X) / float64(dimensions.Max.X)
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yscale := float64(imgSize.Y) / float64(dimensions.Max.Y)
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// creates new rescaled image based on a given image dimensions
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resized = image.NewRGBA(dimensions)
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// get pixels from the original image
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for x := 0; x < dimensions.Max.X; x++ {
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for y := 0; y < dimensions.Max.Y; y++ {
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xp := int(math.Floor(float64(x) * xscale))
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yp := int(math.Floor(float64(y) * yscale))
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pixel := img.At(xp, yp)
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resized.Set(x, y, pixel)
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}
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}
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return
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}
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// returns a Rectangle of dimensions <width>x<height>
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func dimensionsToRectangle(width int, height int) image.Rectangle {
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upLeft := image.Point{0, 0}
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lowRight := image.Point{width, height}
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return image.Rectangle{upLeft, lowRight}
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}
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