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fonticon.go
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fonticon.go
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package main
import (
"bytes"
"image"
"image/color"
"fyne.io/fyne"
"fyne.io/fyne/canvas"
"github.com/icza/bitio"
"osdapp/frskyosd"
)
// FontIcon is a convenience type wrapping a canvas.Image
// that allows setting font character data directly.
type FontIcon struct {
canvas.Image
}
// SetFontData updates the icon to display the given font
// data, which must be 54 bytes.
func (i *FontIcon) SetFontData(data []byte) {
bg := color.Gray{
Y: (255 * 3) / 4,
}
img := image.NewRGBA(image.Rect(0, 0, 12, 18))
for ii := 0; ii < img.Rect.Dx(); ii++ {
for jj := 0; jj < img.Rect.Dy(); jj++ {
img.Set(ii, jj, bg)
}
}
if len(data) > 0 {
r := bitio.NewReader(bytes.NewReader(data))
for jj := 0; jj < img.Rect.Dy(); jj++ {
for ii := 0; ii < img.Rect.Dx(); ii++ {
var c color.Color = nil
pix, err := r.ReadBits(2)
if err != nil {
panic(err)
}
switch pix {
case 0:
c = color.Black
case 1:
case 2:
c = color.White
case 3:
c = color.Gray{Y: 127}
}
if c != nil {
img.Set(ii, jj, c)
}
}
}
}
i.Image.Image = img
i.Image.Refresh()
}
// SetFont updates the displayed font image from a FontCharMessage
func (i *FontIcon) SetFont(msg *frskyosd.FontCharMessage) {
var data []byte
if msg != nil {
data = msg.Data[:]
}
i.SetFontData(data)
}
// NewFontIcon returns a *FontIcon ready to be used
func NewFontIcon() *FontIcon {
fi := &FontIcon{}
fi.Image.FillMode = canvas.ImageFillContain
fi.SetMinSize(fyne.NewSize(12, 18))
fi.SetFont(nil)
return fi
}