Add bitmap font rendering via PNG tilesheet

Replace egui text rendering with a BitmapFont system:
- Glyph.tile: u32 replaces ch: char; top-left pixel of PNG is background sentinel
- BitmapFont loads/preprocesses PNG to opaque-white + transparent, tinted at render time
- Default font: assets/vga-font-8x16.png (CP437, 8×16 tiles); placeholder generated if missing
- Boards can specify a per-board font via [font] in their .toml file
- Editor Board tab: "Font…" button opens font dialog (rfd file picker, tile dims, tilesheet preview)
- Glyph picker: tile grid from active font replaces hardcoded ASCII char grid
- map_file: TileIndex untagged enum accepts char or integer in palette entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

This commit is contained in:

Ross Andrews

2026-05-19 00:07:04 -05:00

parent 12ebe77932

commit 212297ecf9

14 changed files with 1174 additions and 260 deletions

									
										Cargo.toml
									
		+2
		
												View File
												
				@@ -8,3 +8,5 @@ eframe = "0.33.3"

				rhai = "1"

				serde = { version = "1", features = ["derive"] }

				toml = "0.8"

				image = { version = "0.25", default-features = false, features = ["png"] }

				rfd = "0.15"