Function scaleImage

pkg/chat/image.go:252–256

scaleImage resizes img to the given dimensions using CatmullRom (bicubic) interpolation.

(img image.Image, w, h int)

// scaleImage resizes img to the given dimensions using CatmullRom (bicubic) interpolation.
func scaleImage(img image.Image, w, h int) image.Image {
	dst := image.NewRGBA(image.Rect(0, 0, w, h))
	draw.CatmullRom.Scale(dst, dst.Bounds(), img, img.Bounds(), draw.Over, nil)
	return dst
}

// pickSmallestEncoding encodes the image as both PNG and JPEG and returns whichever is smaller.
func pickSmallestEncoding(img image.Image) ([]byte, string, error) {