7.2 Font Fallback

When a character is not found in the current font, D3-TUI will: 1. Try the next font in the fallback chain 2. Use a default replacement character (□) 3. Skip the character (last resort)

/* Set font fallback chain */
void d3tui_font_set_fallback(d3tui_font_t *primary, 
                            d3tui_font_t **fallbacks, size_t count);

8. Performance Considerations

8.1 Texture Upload Optimization

• Upload font textures once at load time
• Keep textures in VRAM for the lifetime of the font
• Use DMA transfers for texture uploads

8.2 Memory Optimization

• Share texture atlases between fonts when possible
• Use paletted textures for monochrome fonts
• Compress texture data if memory is constrained