package d2asset import ( "encoding/binary" "image/color" "strings" "github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface" "github.com/OpenDiablo2/OpenDiablo2/d2common/d2math" ) type fontGlyph struct { frame int width int height int } // Font represents a displayable font type Font struct { sheet d2interface.Animation table []byte glyphs map[rune]fontGlyph color color.Color } // 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) { if f.glyphs == nil { f.initGlyphs() } var ( lineWidth int lineHeight int ) for _, c := range text { if c == '\n' { width = d2math.MaxInt(width, lineWidth) height += lineHeight lineWidth = 0 lineHeight = 0 } else if glyph, ok := f.glyphs[c]; ok { lineWidth += glyph.width lineHeight = d2math.MaxInt(lineHeight, glyph.height) } } width = d2math.MaxInt(width, lineWidth) height += lineHeight return width, height } // 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 { if f.glyphs == nil { f.sheet.BindRenderer(target.Renderer()) f.initGlyphs() } f.sheet.SetColorMod(f.color) 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 } f.sheet.Render(target) lineHeight = d2math.MaxInt(lineHeight, glyph.height) lineLength++ target.PushTranslation(glyph.width, 0) } target.PopN(lineLength) target.PushTranslation(0, lineHeight) } target.PopN(len(lines)) return nil } func (f *Font) initGlyphs() { _, maxCharHeight := f.sheet.GetFrameBounds() glyphs := make(map[rune]fontGlyph) for i := 12; i < len(f.table); i += 14 { code := rune(binary.LittleEndian.Uint16(f.table[i : i+2])) var glyph fontGlyph glyph.frame = int(binary.LittleEndian.Uint16(f.table[i+8 : i+10])) glyph.width = int(f.table[i+3]) glyph.height = maxCharHeight glyphs[code] = glyph } f.glyphs = glyphs }