Initial commit

engine/graphics/font/tilefont.go

@@ -0,0 +1,41 @@
+package font
+
+import (
+	"tetris/engine/graphics"
+)
+
+// TileFont represents a tile-based font where each character maps
+// to a tile location (X, Y) in a tileset or texture atlas.
+//
+// The character-to-tile mapping is defined in the Charmap.
+// If CaseInsensitive is true, uppercase characters ('A'–'Z')
+// are automatically converted to lowercase before lookup.
+type TileFont struct {
+	Charmap map[rune]byte
+
+	// CaseInsensitive forces all characters to lowercase before lookup.
+	CaseInsensitive bool
+}
+
+// GetTile returns the Tile corresponding to the given character.
+//
+// If CaseInsensitive is enabled, uppercase ASCII characters are converted
+// to lowercase before lookup. If the character is not found in the Charmap,
+// GetTile returns nil.
+//
+// The resulting Tile assumes a fixed tile size of 8x8 pixels
+func (f TileFont) GetTile(char rune) *graphics.Tile {
+	// convert to lowercase
+	if f.CaseInsensitive && char >= 'A' && char <= 'Z' {
+		char = char + 0x20
+	}
+
+	if offset, found := f.Charmap[char]; found {
+		return &graphics.Tile{
+			Size: 8,
+			X:    offset & 0xF,
+			Y:    offset >> 4,
+		}
+	}
+	return nil
+}