Add Chinese text rendering support

Extend the bitmap font pipeline with the Chinese Joker glyph subset and encode supported UTF-8 text for Tonc TTE. Move the affine map clear of the expanded font, add a compile-time VRAM overlap guard, and cover every custom glyph with host tests.

scripts/generate_font.py

@@ -5,7 +5,6 @@ import argparse
 
 CHAR_WIDTH = 8
 CHAR_HEIGHT = 8
-NUM_VERT_CHARS = 6
 NUM_HORZ_CHARS = 16
 WORD_SIZE = 32
 
@@ -48,8 +47,14 @@ img = img.convert("P")
 img = img.convert('1')
 img = ImageOps.invert(img)
 
+if img.width != NUM_HORZ_CHARS * CHAR_WIDTH or img.height % CHAR_HEIGHT != 0:
+    raise ValueError("font image must be 128px wide and a multiple of 8px high")
+
+num_vert_chars = img.height // CHAR_HEIGHT
+num_chars = num_vert_chars * NUM_HORZ_CHARS
+
 glyphs = []
-for char_y in range(NUM_VERT_CHARS):
+for char_y in range(num_vert_chars):
     for char_x in range(NUM_HORZ_CHARS):
         # Get the 8x8 crop area at our current character in the image
         pix_x = char_x * CHAR_WIDTH
@@ -86,7 +91,7 @@ with open(out_path, "w") as out:
     .global	gbalatro_sys8Font
 gbalatro_sys8Font:
     .word	gbalatro_sys8Glyphs, 0, 0
-    .hword	32, 96
+    .hword	32, %d
     .byte	8, 8
     .byte	8, 8
     .hword	8
@@ -94,9 +99,9 @@ gbalatro_sys8Font:
 
     .section .rodata
     .align	2
-    .global gbalatro_sys8Glyphs		@ 768 bytes (192 unsigned ints)
+    .global gbalatro_sys8Glyphs
 gbalatro_sys8Glyphs:
-""")
+""" % num_chars)
     
     for i, glyph in enumerate(glyphs):
         if first: