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image.go
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image.go
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package main
import (
"fmt"
"image"
"image/color"
"image/draw"
"image/jpeg"
"io"
"log"
"os"
"time"
)
type editableImage struct {
draw.Image
}
// imageStruct with metadata and related rect
type img struct {
path string
fileType string
time time.Time
rect rectCoord
}
// coordinates where object is marked
type rectCoord struct {
idx int64
x0 int64
y0 int64
x1 int64
y1 int64
}
func readOs(path string) *os.File {
f, err := os.Open(path)
if err != nil {
panic(err)
}
defer f.Close()
return f
}
func exportEditImage(path string) editableImage {
f := readOs(path)
img_, err := drawableRGBImage(f)
if err != nil {
log.Fatal(err)
}
custImg := editableImage{
img_,
}
return custImg
}
// function exporting Color space from image
// to Add: direction of exporting X and Y space
// should be a method for struct?
func (img imgColor) exportImageColor(path string) imgColor {
var r []uint8
var g []uint8
var b []uint8
var a []uint8
f := readOs(path)
imgTemp, _, err := image.Decode(f)
if err != nil {
log.Fatalln(err)
}
size := imgTemp.Bounds().Size()
for x := 0; x < size.X; x++ {
for y := 0; y < size.Y; y++ {
pixel := imgTemp.At(x, y)
col := color.RGBAModel.Convert(pixel).(color.RGBA)
r = append(r, col.R)
g = append(g, col.G)
b = append(b, col.B)
a = append(a, col.A)
}
}
img.red = r
img.green = g
img.blue = b
img.alpha = a
return img
}
func writeImg(path string, img draw.Image) {
out, err := os.Create(path)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
e := jpeg.Encode(out, img, nil)
if e != nil {
fmt.Println(e)
os.Exit(1)
}
}
func addRectangle(img editableImage, coor rectCoord) draw.Image {
myRectangle := image.Rect(int(coor.x0), int(coor.y0), int(coor.x1), int(coor.y1))
myColor := color.RGBA{255, 0, 255, 255}
min := myRectangle.Min
max := myRectangle.Max
for i := min.X; i < max.X; i++ {
img.Set(i, min.Y, myColor)
img.Set(i, max.Y, myColor)
}
for i := min.Y; i <= max.Y; i++ {
img.Set(min.X, i, myColor)
img.Set(max.X, i, myColor)
}
return img
}
func drawableRGBImage(f io.Reader) (draw.Image, error) {
img, err := jpeg.Decode(f)
if err != nil {
return nil, err
}
b := img.Bounds()
output_rgb := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(output_rgb, output_rgb.Bounds(), img, b.Min, draw.Src)
return output_rgb, nil
}
// function reads file from disk and exports an image.Image object used for image manipulations
func imageToColorSpace(inputPath string) image.Image {
f, err := os.Open(inputPath)
if err != nil {
panic(err)
}
defer f.Close()
imgInputSobel, _, err := image.Decode(f)
if err != nil {
panic(err)
}
return imgInputSobel
}