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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package services | ||
|
|
||
| import ( | ||
| "image" | ||
| "image/color" | ||
| "image/draw" | ||
| "log" | ||
| "os" | ||
|
|
||
| "github.com/golang/freetype" | ||
| "github.com/golang/freetype/truetype" | ||
| "github.com/spf13/viper" | ||
| ) | ||
|
|
||
| const ( | ||
| fontSize = 400 | ||
| imageW = 640 | ||
| imageH = 480 | ||
| ) | ||
|
|
||
| type AvatarService interface { | ||
| GenerateAvatar(word string) (image.Image, error) | ||
| } | ||
|
|
||
| type avatarService struct { | ||
| font *truetype.Font | ||
| } | ||
|
|
||
| func NewAvatarService() AvatarService { | ||
| // Read the font data. | ||
| fontBytes, err := os.ReadFile(viper.GetString("font")) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| font, err := freetype.ParseFont(fontBytes) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| return &avatarService{ | ||
| font: font, | ||
| } | ||
| } | ||
|
|
||
| func randomColor(k int16) color.Color { | ||
| loc := uint8(k & 0x03) | ||
| switch loc { | ||
| case 0: | ||
| return color.RGBA{ | ||
| R: uint8(k & 0xff), | ||
| G: 0, | ||
| B: 0, | ||
| A: 255, | ||
| } | ||
| case 1: | ||
| return color.RGBA{ | ||
| R: 0, | ||
| G: uint8(k & 0xff), | ||
| B: 0, | ||
| A: 255, | ||
| } | ||
| default: | ||
| return color.RGBA{ | ||
| R: 0, | ||
| G: 0, | ||
| B: uint8(k & 0xff), | ||
| A: 255, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (s *avatarService) GenerateAvatar(word string) (image.Image, error) { | ||
| wordB := []byte(word) | ||
| rand := int16(wordB[0]) | ||
| if len(wordB) > 1 { | ||
| rand += int16(wordB[1]) | ||
| } | ||
| m := image.NewRGBA(image.Rect(0, 0, imageW, imageH)) | ||
| draw.Draw(m, m.Bounds(), &image.Uniform{randomColor(rand)}, image.Point{}, draw.Src) | ||
|
|
||
| c := freetype.NewContext() | ||
| c.SetDPI(72) | ||
| c.SetFont(s.font) | ||
| c.SetFontSize(fontSize) | ||
| c.SetClip(m.Bounds()) | ||
| c.SetDst(m) | ||
| c.SetSrc(image.White) | ||
|
|
||
| pt := freetype.Pt(int(c.PointToFixed((imageW-fontSize)/2)>>6)+10, int(c.PointToFixed(fontSize)>>6)-20) | ||
| _, err := c.DrawString(word, pt) | ||
| if err != nil { | ||
| log.Printf("GenerateAvatar error: %v", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| return m, nil | ||
| } |
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