Loading of multiple fonts for bold and italic

backends/x/draw.go

@@ -86,9 +86,51 @@ func (backend *Backend) drawRune (
 	// application background color as the background. that way, we won't
 	// need to redraw the characters *or* composite them.
 
+	face := backend.font.normal
+
+	highlight := runeStyle & stone.StyleHighlight > 0
+	bold      := runeStyle & stone.StyleBold      > 0
+	italic    := runeStyle & stone.StyleItalic    > 0
+
+	boldTransform   := false
+	italicTransform := false
+
+	switch {
+	case bold && italic:
+		if backend.font.boldItalic == nil {
+			switch {
+			case
+				backend.font.bold == nil && backend.font.italic != nil,
+				backend.font.bold != nil && backend.font.italic != nil:
+				
+				boldTransform = true
+				face = backend.font.italic
+			case backend.font.italic == nil && backend.font.bold != nil:
+				italicTransform = true
+				face = backend.font.bold
+			default:
+				boldTransform   = true
+				italicTransform = true
+			}
+		} else {
+			face = backend.font.boldItalic
+		}
+	case bold:
+		if backend.font.bold == nil {
+			boldTransform = true
+		} else {
+			face = backend.font.bold
+		}
+	case italic:
+		if backend.font.italic == nil {
+			italicTransform = true
+		} else {
+			face = backend.font.italic
+		}
+	}
+	
 	var background xgraphics.BGRA
 	var foreground xgraphics.BGRA
-	highlight := runeStyle & stone.StyleHighlight > 0
 
 	if highlight {
 		background = backend.colors[runeColor]
@@ -108,7 +150,7 @@ func (backend *Backend) drawRune (
 	origin := backend.originOfCell(x, y + 1)
 
 	if character >= 32 {
-		destinationRectangle, mask, maskPoint, _, ok := backend.font.face.Glyph (
+		destinationRectangle, mask, maskPoint, _, ok := face.Glyph (
 			fixed.Point26_6 {
 				X: fixed.I(origin.X),
 				Y: fixed.I(origin.Y),
@@ -139,8 +181,7 @@ func (backend *Backend) drawRune (
 			backend.sprayRuneMask (
 				mask, destinationRectangle,
 				maskPoint, foreground, background,
-				runeStyle & stone.StyleItalic > 0,
-				runeStyle & stone.StyleBold   > 0)
+				italicTransform, boldTransform)
 		// }
 	}
 

backends/x/factory.go

@@ -32,11 +32,20 @@ func factory (
 	}
 
 	// load font
-	backend.font.face = findAndLoadFont (
-		backend.config.FontName(),
+	backend.font.normal = findAndLoadFont (
+		backend.config.FontNameNormal(),
 		float64(backend.config.FontSize()))
-	if backend.font.face == nil {
-		backend.font.face = basicfont.Face7x13
+	backend.font.bold = findAndLoadFont (
+		backend.config.FontNameBold(),
+		float64(backend.config.FontSize()))
+	backend.font.italic = findAndLoadFont (
+		backend.config.FontNameItalic(),
+		float64(backend.config.FontSize()))
+	backend.font.boldItalic = findAndLoadFont (
+		backend.config.FontNameBoldItalic(),
+		float64(backend.config.FontSize()))
+	if backend.font.normal == nil {
+		backend.font.normal = basicfont.Face7x13
 	}
 
 	// pre-calculate colors
@@ -56,8 +65,8 @@ func factory (
 	}
 
 	// calculate metrics
-	metrics := backend.font.face.Metrics()
-	glyphAdvance, _ := backend.font.face.GlyphAdvance('M')
+	metrics := backend.font.normal.Metrics()
+	glyphAdvance, _ := backend.font.normal.GlyphAdvance('M')
 	backend.metrics.cellWidth  = glyphAdvance.Round()
 	backend.metrics.cellHeight = metrics.Height.Round()
 	backend.metrics.descent    = metrics.Descent.Round()

backends/x/x.go

@@ -27,7 +27,10 @@ type Backend struct {
 	lock sync.Mutex
 
 	font struct {
-		face font.Face
+		normal     font.Face
+		bold       font.Face
+		italic     font.Face
+		boldItalic font.Face
 	}
 
 	colors [8]xgraphics.BGRA