feat(misc): support vietnamese wheel beta text

internal/modules/misc/fonts/dejavu-sans-license.txt

@@ -0,0 +1,47 @@
+DejaVu Sans font license
+
+Source: https://dejavu-fonts.github.io/
+
+Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved.
+Bitstream Vera is a trademark of Bitstream, Inc.
+DejaVu changes are in public domain.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of the fonts accompanying this license ("Fonts") and associated
+documentation files (the "Font Software"), to reproduce and distribute the
+Font Software, including without limitation the rights to use, copy, merge,
+publish, distribute, and/or sell copies of the Font Software, and to permit
+persons to whom the Font Software is furnished to do so, subject to the
+following conditions:
+
+The above copyright and trademark notices and this permission notice shall
+be included in all copies of one or more of the Font Software typefaces.
+
+The Font Software may be modified, altered, or added to, and in particular
+the designs of glyphs or characters in the Fonts may be modified and
+additional glyphs or characters may be added to the Fonts, only if the fonts
+are renamed to names not containing either the words "Bitstream" or the word
+"Vera".
+
+This License becomes null and void to the extent applicable to Fonts or Font
+Software that has been modified and distributed under the "Bitstream Vera"
+names.
+
+The Font Software may be sold as part of a larger software package but no
+copy of one or more of the Font Software typefaces may be sold by itself.
+
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,
+TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL BITSTREAM OR THE GNOME
+FOUNDATION BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING
+ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE
+FONT SOFTWARE.
+
+Except as contained in this notice, the names of Gnome, the Gnome
+Foundation, and Bitstream Inc., shall not be used in advertising or
+otherwise to promote the sale, use or other dealings in this Font Software
+without prior written authorization from the Gnome Foundation or Bitstream
+Inc., respectively.

internal/modules/misc/handlers_test.go

@@ -425,6 +425,32 @@ func TestWheelOfNamesBeta_RotatesOptionLabelsWithSlices(t *testing.T) {
 	}
 }
 
+func TestWheelOfNamesBeta_DisplayTextPreservesVietnamese(t *testing.T) {
+	input := "Tiếng Việt Đặng"
+	got := wheelBetaDisplayText(input, 32)
+	if got != input {
+		t.Fatalf("wheelBetaDisplayText() = %q, want %q", got, input)
+	}
+	if strings.Contains(got, "?") {
+		t.Fatalf("wheelBetaDisplayText() replaced Vietnamese with ?: %q", got)
+	}
+}
+
+func TestWheelOfNamesBeta_FontSupportsVietnameseGlyphs(t *testing.T) {
+	for _, r := range "Tiếng Việt Đặng Ơ Ư ấ ệ" {
+		if r == ' ' {
+			continue
+		}
+		glyphIndex, err := wheelBetaTextFont.GlyphIndex(nil, r)
+		if err != nil {
+			t.Fatalf("GlyphIndex(%q): %v", r, err)
+		}
+		if glyphIndex == 0 {
+			t.Fatalf("GlyphIndex(%q) = 0, want Vietnamese glyph support", r)
+		}
+	}
+}
+
 func countColorIndex(img *image.Paletted, bounds image.Rectangle, colorIndex byte) int {
 	bounds = bounds.Intersect(img.Bounds())
 	count := 0

internal/modules/misc/wheelofnames_beta.go

@@ -140,10 +140,10 @@ func renderWheelBetaFrameWithCelebration(options []string, winner int, rotation
 	if label == "" {
 		label = "CURRENT"
 	}
-	value := asciiWheelText(options[currentIndex], 28)
+	value := wheelBetaDisplayText(options[currentIndex], 28)
 	if reveal {
 		label = "RESULT"
-		value = asciiWheelText(options[winner], 28)
+		value = wheelBetaDisplayText(options[winner], 28)
 	}
 	drawStatusBand(img, label, value)
 	return img

internal/modules/misc/wheelofnames_beta_drawing.go

@@ -1,20 +1,49 @@
 package misc
 
 import (
+	_ "embed"
 	"image"
 	"image/color"
 	"math"
 	"strings"
+	"unicode"
 
 	"golang.org/x/image/font"
-	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/font/opentype"
 	"golang.org/x/image/math/fixed"
 )
 
 const (
 	wheelBetaSliceLabelRadius = 64
+	wheelBetaFontSize         = 10
+	wheelBetaFontDPI          = 72
 )
 
+//go:embed fonts/dejavu-sans.ttf
+var wheelBetaTextFontBytes []byte
+
+var wheelBetaTextFont = mustWheelBetaTextFont()
+
+func mustWheelBetaTextFont() *opentype.Font {
+	parsed, err := opentype.Parse(wheelBetaTextFontBytes)
+	if err != nil {
+		panic(err)
+	}
+	return parsed
+}
+
+func newWheelBetaTextFace() font.Face {
+	face, err := opentype.NewFace(wheelBetaTextFont, &opentype.FaceOptions{
+		Size:    wheelBetaFontSize,
+		DPI:     wheelBetaFontDPI,
+		Hinting: font.HintingFull,
+	})
+	if err != nil {
+		panic(err)
+	}
+	return face
+}
+
 func drawWheelSliceLabels(img *image.Paletted, options []string, rotation float64) {
 	if len(options) == 0 {
 		return
@@ -26,7 +55,7 @@ func drawWheelSliceLabels(img *image.Paletted, options []string, rotation float6
 		angle := rotation + (float64(idx)+0.5)*segment
 		centerX := cx + int(math.Round(math.Cos(angle)*float64(wheelBetaSliceLabelRadius)))
 		centerY := cy + int(math.Round(math.Sin(angle)*float64(wheelBetaSliceLabelRadius)))
-		text := asciiWheelText(option, limit)
+		text := wheelBetaDisplayText(option, limit)
 		drawRotatedCenteredTextAt(img, text, centerX+1, centerY+1, angle, wheelBetaPaperColorIndex)
 		drawRotatedCenteredTextAt(img, text, centerX, centerY, angle, wheelBetaInkColorIndex)
 	}
@@ -203,7 +232,10 @@ func drawCenteredText(img *image.Paletted, text string, baselineY int, colorInde
 }
 
 func drawCenteredTextAt(img *image.Paletted, text string, centerX, baselineY int, colorIndex byte) {
-	face := basicfont.Face7x13
+	face := newWheelBetaTextFace()
+	defer func() {
+		_ = face.Close()
+	}()
 	width := font.MeasureString(face, text).Ceil()
 	x := centerX - width/2
 	drawer := font.Drawer{
@@ -216,7 +248,10 @@ func drawCenteredTextAt(img *image.Paletted, text string, centerX, baselineY int
 }
 
 func drawRotatedCenteredTextAt(img *image.Paletted, text string, centerX, centerY int, angle float64, colorIndex byte) {
-	face := basicfont.Face7x13
+	face := newWheelBetaTextFace()
+	defer func() {
+		_ = face.Close()
+	}()
 	padding := 2
 	metrics := face.Metrics()
 	textWidth := font.MeasureString(face, text).Ceil()
@@ -247,17 +282,20 @@ func drawRotatedCenteredTextAt(img *image.Paletted, text string, centerX, center
 	}
 }
 
-func asciiWheelText(s string, limit int) string {
+func wheelBetaDisplayText(s string, limit int) string {
 	var b strings.Builder
+	count := 0
 	for _, r := range s {
-		if b.Len() >= limit {
+		if count >= limit {
 			break
 		}
-		if r < 32 || r > 126 {
+		if unicode.IsControl(r) {
 			b.WriteByte('?')
+			count++
 			continue
 		}
 		b.WriteRune(r)
+		count++
 	}
 	out := strings.TrimSpace(b.String())
 	if out == "" {