package main import ( "errors" "image" "io/ioutil" "os" "github.com/golang/freetype" "github.com/nfnt/resize" "image/color" "image/draw" _ "image/gif" _ "image/jpeg" "image/png" _ "image/png" "b612.me/starainrt" ) func OpenImage(name string) (image.Image, error) { if !starainrt.Exists(name) { return nil, errors.New("File Not Exists") } fso, err := os.Open(name) if err != nil { return nil, err } img, _, err := image.Decode(fso) if err != nil { return nil, err } return img, nil } func MergePhoto(big, small image.Image, bigsize, smallsize uint, x, y int) image.Image { big = resize.Resize(bigsize, bigsize, big, resize.Lanczos3) small = resize.Resize(smallsize, smallsize, small, resize.Lanczos3) offset := image.Pt(x, y) b := big.Bounds() nimg := image.NewRGBA(b) draw.Draw(nimg, b, big, image.ZP, draw.Src) draw.Draw(nimg, small.Bounds(), small, offset, draw.Over) return nimg } func SavePhoto(path string, img image.Image) error { imgf, err := os.Create(path) if err != nil { return err } defer imgf.Close() return png.Encode(imgf, img) } func SetAlpha(img image.Image, alpha uint8) image.Image { size := img.Bounds() nimg := image.NewRGBA(size) for x := 0; x < size.Dx(); x++ { for y := 0; y < size.Dy(); y++ { r, g, b, a := img.At(x, y).RGBA() r = r >> 8 g = g >> 8 b = b >> 8 a = a >> 8 nimg.Set(x, y, color.NRGBA{uint8(r), uint8(g), uint8(b), alpha}) //nimg.Set(x, y, color.Alpha{alpha}) //nimg.Set(x, y, img.At(x, y)) } } return nimg } func AddText(text string, img image.Image, x, y int, dpi, size float64, colors color.RGBA, ttf string) (image.Image, error) { if !starainrt.Exists(ttf) { return nil, errors.New("File Not Exists") } fontbyte, err := ioutil.ReadFile(ttf) if err != nil { return nil, err } font, err := freetype.ParseFont(fontbyte) if err != nil { return nil, err } nimg, ok := img.(draw.Image) if !ok { size := img.Bounds() nimg = image.NewRGBA(img.Bounds()) for x := 0; x < size.Dx(); x++ { for y := 0; y < size.Dy(); y++ { r, g, b, a := img.At(x, y).RGBA() nimg.Set(x, y, color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}) } } } f := freetype.NewContext() f.SetDPI(dpi) f.SetFontSize(size) f.SetFont(font) f.SetClip(nimg.Bounds()) f.SetDst(nimg) f.SetSrc(image.NewUniform(colors)) _, err = f.DrawString(text, freetype.Pt(x, y)) if err != nil { return nil, err } return nimg, nil } type TextImg struct { Text string X int Y int Dpi float64 Size float64 Color color.NRGBA } type TextList struct { List []TextImg TTF []byte } func AddListTests(list TextList, img image.Image) (image.Image, error) { font, err := freetype.ParseFont(list.TTF) if err != nil { return nil, err } nimg, ok := img.(draw.Image) if !ok { size := img.Bounds() nimg = image.NewRGBA(img.Bounds()) for x := 0; x < size.Dx(); x++ { for y := 0; y < size.Dy(); y++ { r, g, b, a := img.At(x, y).RGBA() nimg.Set(x, y, color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}) } } } for _, v := range list.List { f := freetype.NewContext() f.SetDPI(v.Dpi) f.SetFontSize(v.Size) f.SetFont(font) f.SetClip(nimg.Bounds()) f.SetDst(nimg) f.SetSrc(image.NewUniform(v.Color)) _, err = f.DrawString(v.Text, freetype.Pt(v.X, v.Y)) if err != nil { return nil, err } } return nimg, nil } func AddTexts(text string, img image.Image, x, y int, dpi, size float64, colors color.NRGBA, ttf string) (image.Image, error) { if !starainrt.Exists(ttf) { return nil, errors.New("File Not Exists") } fontbyte, err := ioutil.ReadFile(ttf) if err != nil { return nil, err } font, err := freetype.ParseFont(fontbyte) if err != nil { return nil, err } nimg, ok := img.(draw.Image) if !ok { size := img.Bounds() nimg = image.NewRGBA(img.Bounds()) for x := 0; x < size.Dx(); x++ { for y := 0; y < size.Dy(); y++ { r, g, b, a := img.At(x, y).RGBA() nimg.Set(x, y, color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}) } } } f := freetype.NewContext() f.SetDPI(dpi) f.SetFontSize(size) f.SetFont(font) f.SetClip(nimg.Bounds()) f.SetDst(nimg) f.SetSrc(image.NewUniform(colors)) _, err = f.DrawString(text, freetype.Pt(x, y)) if err != nil { return nil, err } return nimg, nil }