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messure.go
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/
messure.go
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package sahar
import (
"fmt"
"os"
"sync"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
)
var cacheFontFaceLock sync.Mutex
var cacheFontFace = make(map[string]font.Face)
func loadFont(filename string, size float64) (font.Face, error) {
cacheFontFaceLock.Lock()
defer cacheFontFaceLock.Unlock()
key := fmt.Sprintf("%s-%f", filename, size)
if fnt, ok := cacheFontFace[key]; ok {
return fnt, nil
}
// Read the font file
fontBytes, err := os.ReadFile(filename)
if err != nil {
return nil, err
}
// Parse the font
parsedFont, err := opentype.Parse(fontBytes)
if err != nil {
return nil, err
}
// Create a font face
fontFace, err := opentype.NewFace(parsedFont, &opentype.FaceOptions{
Size: size,
DPI: 72,
Hinting: font.HintingFull,
})
if err != nil {
return nil, err
}
cacheFontFace[key] = fontFace
return fontFace, nil
}
func measureString(s string, fnt font.Face) (int, int) {
d := &font.Drawer{
Dst: nil, // Destination image, not needed for measurement
Src: nil, // Source image, not needed for measurement
Face: fnt,
}
// Calculate the width
width := d.MeasureString(s).Ceil()
// Calculate the height
height := (fnt.Metrics().Ascent + fnt.Metrics().Descent).Ceil()
return width, height
}