organizing + useless instructions

dimensions.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"image"
+	"math"
+)
+
+// creates a new rectangle with the min height and width from both images
+func getMaxDimensions(img1 image.Image, img2 image.Image) image.Rectangle {
+	// get dimensions for both images
+	size1 := img1.Bounds().Size()
+	size2 := img2.Bounds().Size()
+
+	// final image sized from lowest width and height
+	width := int(math.Min(float64(size1.X), float64(size2.X)))
+	height := int(math.Min(float64(size1.Y), float64(size2.Y)))
+
+	// the dimensions, as Points, of the output image
+	upLeft := image.Point{0, 0}
+	lowRight := image.Point{width, height}
+
+	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}
+}