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feat: Initial dynamic icon implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package dynamic_icon | ||
|
|
||
| import ( | ||
| "bytes" | ||
| _ "embed" | ||
| "errors" | ||
| "fmt" | ||
| "image" | ||
| "os" | ||
|
|
||
| "github.com/gabe565/nightscout-menu-bar/internal/config" | ||
| "github.com/gabe565/nightscout-menu-bar/internal/nightscout" | ||
| "github.com/golang/freetype" | ||
| "github.com/golang/freetype/truetype" | ||
| ) | ||
|
|
||
| var ( | ||
| //go:embed Roboto-Bold.ttf | ||
| embeddedFont []byte | ||
|
|
||
| face *truetype.Font | ||
|
|
||
| ErrInvalidColor = errors.New("invalid color") | ||
| ) | ||
|
|
||
| func Generate(p *nightscout.Properties) ([]byte, error) { | ||
| if face == nil { | ||
| var b []byte | ||
| if config.Default.DynamicIcon.FontFile == "" { | ||
| b = embeddedFont | ||
| } else { | ||
| var err error | ||
| if b, err = os.ReadFile(config.Default.DynamicIcon.FontFile); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| var err error | ||
| if face, err = freetype.ParseFont(b); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| img := image.NewRGBA(image.Rectangle{Max: image.Point{X: 32, Y: 32}}) | ||
| c := freetype.NewContext() | ||
| c.SetFont(face) | ||
| c.SetFontSize(config.Default.DynamicIcon.FontSize) | ||
| c.SetClip(img.Bounds()) | ||
| c.SetDst(img) | ||
| switch config.Default.DynamicIcon.FontColor { | ||
| case "white": | ||
| c.SetSrc(image.White) | ||
| case "black": | ||
| c.SetSrc(image.Black) | ||
| default: | ||
| return nil, fmt.Errorf("%w: %s", ErrInvalidColor, config.Default.DynamicIcon.FontColor) | ||
| } | ||
|
|
||
| pt := freetype.Pt(0, config.Default.DynamicIcon.YOffset+int(c.PointToFixed(config.Default.DynamicIcon.FontSize)>>6)) | ||
| if _, err := c.DrawString(p.Bgnow.DisplayBg(), pt); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var buf bytes.Buffer | ||
| if err := encode(&buf, img); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return buf.Bytes(), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| //go:build !windows | ||
|
|
||
| package dynamic_icon | ||
|
|
||
| import ( | ||
| "image" | ||
| "image/png" | ||
| "io" | ||
| ) | ||
|
|
||
| func encode(w io.Writer, img image.Image) error { | ||
| return png.Encode(w, img) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package dynamic_icon | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "image" | ||
| "image/png" | ||
| "io" | ||
| ) | ||
|
|
||
| type iconDir struct { | ||
| reserved uint16 | ||
| imageType uint16 | ||
| numImages uint16 | ||
| } | ||
|
|
||
| type iconDirEntry struct { | ||
| imageWidth uint8 | ||
| imageHeight uint8 | ||
| numColors uint8 | ||
| reserved uint8 | ||
| colorPlanes uint16 | ||
| bitsPerPixel uint16 | ||
| sizeInBytes uint32 | ||
| offset uint32 | ||
| } | ||
|
|
||
| func newIcondir() iconDir { | ||
| return iconDir{ | ||
| imageType: 1, | ||
| numImages: 1, | ||
| } | ||
| } | ||
|
|
||
| func newIcondirentry() iconDirEntry { | ||
| return iconDirEntry{ | ||
| colorPlanes: 1, // windows is supposed to not mind 0 or 1, but other icon files seem to have 1 here | ||
| bitsPerPixel: 32, // can be 24 for bitmap or 24/32 for png. Set to 32 for now | ||
| offset: 22, // 6 iconDir + 16 iconDirEntry, next image will be this image size + 16 iconDirEntry, etc | ||
| } | ||
| } | ||
|
|
||
| func encode(w io.Writer, img image.Image) error { | ||
| dir := newIcondir() | ||
| entry := newIcondirentry() | ||
|
|
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| var buf bytes.Buffer | ||
| if err := png.Encode(&buf, img); err != nil { | ||
| return err | ||
| } | ||
| entry.sizeInBytes = uint32(buf.Len()) | ||
|
|
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| bounds := img.Bounds() | ||
| entry.imageWidth = uint8(bounds.Dx()) | ||
| entry.imageHeight = uint8(bounds.Dy()) | ||
|
|
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| if err := binary.Write(w, binary.LittleEndian, dir); err != nil { | ||
| return err | ||
| } | ||
| if err := binary.Write(w, binary.LittleEndian, entry); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if _, err := buf.WriteTo(w); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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