package d2asset import ( "encoding/binary" "errors" "image/color" "strings" "github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface" "github.com/OpenDiablo2/OpenDiablo2/d2common" ) type fontGlyph struct { frame int width int height int } // Font represents a displayable font type Font struct { sheet d2interface.Animation glyphs map[rune]fontGlyph color color.Color } func loadFont(tablePath, spritePath, palettePath string) (d2interface.Font, error) { sheet, err := LoadAnimation(spritePath, palettePath) if err != nil { return nil, err } data, err := LoadFile(tablePath) if err != nil { return nil, err } if string(data[:5]) != "Woo!\x01" { return nil, errors.New("invalid font table format") } _, maxCharHeight := sheet.GetFrameBounds() glyphs := make(map[rune]fontGlyph) for i := 12; i < len(data); i += 14 { code := rune(binary.LittleEndian.Uint16(data[i : i+2])) var glyph fontGlyph glyph.frame = int(binary.LittleEndian.Uint16(data[i+8 : i+10])) glyph.width = int(data[i+3]) glyph.height = maxCharHeight glyphs[code] = glyph } font := &Font{ sheet: sheet, glyphs: glyphs, color: color.White, } return font, nil } // SetColor sets the fonts color func (f *Font) SetColor(c color.Color) { f.color = c } // GetTextMetrics returns the dimensions of the Font element in pixels func (f *Font) GetTextMetrics(text string) (width, height int) { var ( lineWidth int lineHeight int totalWidth int totalHeight int ) for _, c := range text { if c == '\n' { totalWidth = d2common.MaxInt(totalWidth, lineWidth) totalHeight += lineHeight lineWidth = 0 lineHeight = 0 } else if glyph, ok := f.glyphs[c]; ok { lineWidth += glyph.width lineHeight = d2common.MaxInt(lineHeight, glyph.height) } } totalWidth = d2common.MaxInt(totalWidth, lineWidth) totalHeight += lineHeight return totalWidth, totalHeight } // Clone creates a shallow copy of the Font func (f *Font) Clone() d2interface.Font { return &Font{ sheet: f.sheet, glyphs: f.glyphs, color: f.color, } } // RenderText prints a text using its configured style on a Surface (multi-lines are left-aligned, use label otherwise) func (f *Font) RenderText(text string, target d2interface.Surface) error { f.sheet.SetColorMod(f.color) f.sheet.SetBlend(false) lines := strings.Split(text, "\n") for _, line := range lines { var ( lineHeight int lineLength int ) for _, c := range line { glyph, ok := f.glyphs[c] if !ok { continue } if err := f.sheet.SetCurrentFrame(glyph.frame); err != nil { return err } if err := f.sheet.Render(target); err != nil { return err } lineHeight = d2common.MaxInt(lineHeight, glyph.height) lineLength++ target.PushTranslation(glyph.width, 0) } target.PopN(lineLength) target.PushTranslation(0, lineHeight) } target.PopN(len(lines)) return nil }