Fix character code mapping

2 files changed, 59 insertions, 5 deletions

diff --git a/src/charmem.py b/src/charmem.py
index 551ba85..aaac122 100644
--- a/src/charmem.py
+++ b/src/charmem.py
@@ -19,17 +19,19 @@ with open("charset.txt", "r") as f:
 header_chars = lines[0]
 
 charset: list[list[str]] = []
-CHAR_HEIGHT_BITS = 3
-CHAR_HEIGHT = 2 ** CHAR_HEIGHT_BITS
+
+CHAR_HEIGHT = 8
 CHAR_WIDTH = 8
 
-i = CHAR_HEIGHT
+i = 0
 while i < len(lines):
+  i += 1 # skip comment line
   char = lines[i:i+CHAR_HEIGHT]
   for row in char:
-    assert len(row) == CHAR_WIDTH
+    if len(row) != CHAR_WIDTH:
+      raise Exception(f"char row number {i} has width != {CHAR_WIDTH}: {len(row)}\n" + row + "\n" + "\n".join(char))
   charset.append(char)
-  i += CHAR_HEIGHT
+  i += CHAR_HEIGHT + 1
 
 CHAR_N = len(charset)
 
diff --git a/src/convert_ttf.py b/src/convert_ttf.py
new file mode 100644
index 0000000..c1135cb
--- /dev/null
+++ b/src/convert_ttf.py
@@ -0,0 +1,52 @@
+from PIL import Image, ImageFont, ImageDraw
+
+import sys
+
+if len(sys.argv) != 3:
+  print("usage: convert_ttf.py <infile.ttf> <outfile.txt>")
+  sys.exit(1)
+
+# Define the font file and size
+font_file = sys.argv[1]
+out_file = sys.argv[2]
+font_size = 8  # 8x8 pixels
+
+# Create a font object
+font = ImageFont.truetype(font_file, font_size)
+
+
+# backspace 0x8, tab 0x9, newline 0xA, space 0x20
+
+# Define the characters to render
+#characters = '                                 !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~                          ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ'
+
+def to_char_code(i: int) -> str:
+    if i == 10:
+        return " "
+    return chr(i)
+
+characters = [to_char_code(i) for i in range(0, 256)]
+
+
+# Open a file to write the bitmaps to
+with open(out_file, 'w') as bitmap_file:
+    for char_idx, char in enumerate(characters):
+        # Create a new image with a white background
+        image = Image.new('1', (8, 8), 1)
+
+        # Create a drawing context
+        draw = ImageDraw.Draw(image)
+
+        # Draw the character
+        draw.text((0, 0), char, font=font, fill=0)
+
+        # Convert the image to a list of 0's and 1's
+        pixels = image.getdata()
+        bitmap = [1 if pixel == 0 else 0 for pixel in pixels]
+
+        # Write the bitmap to the file
+        bitmap_file.write(f'Character {char_idx}: {char}\n')
+        for i in range(0, 64, 8):
+            row = bitmap[i:i+8]
+            bitmap_file.write(''.join(str(bit) for bit in row) + '\n')
+        bitmap_file.write('\n')