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utility.go
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/
utility.go
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package extractor
import (
"image"
"io"
)
type pixel struct {
R int
G int
B int
A int
}
func getPixels(file io.Reader, quality int) ([]pixel, error) {
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
bounds := img.Bounds()
width, height := bounds.Max.X, bounds.Max.Y
var pixels []pixel
for i := 0; i < width*height; i += quality {
pixel := rgbaToPixel(img.At(i%width, i/width).RGBA())
if pixel.A >= 125 {
if !(pixel.R > 250 && pixel.G > 250 && pixel.B > 250) {
pixels = append(pixels, pixel)
}
}
}
return pixels, nil
}
func rgbaToPixel(r uint32, g uint32, b uint32, a uint32) pixel {
return pixel{int(r / 257), int(g / 257), int(b / 257), int(a / 257)}
}
func min(x, y int) int {
if x < y {
return x
}
return y
}
func max(x, y int) int {
if x > y {
return x
}
return y
}