A tools/make-dotcode.py

@@ -0,0 +1,64 @@
+import numpy as np
+import PIL.Image
+import PIL.ImageChops
+import sys
+
+with open(sys.argv[1], 'rb') as f:
+    data = f.read()
+size = len(data)
+
+blocksize = 104
+blocks = size // blocksize
+height = 36
+width = 35
+margin = 2
+
+dots = np.zeros((width * blocks + margin * 2 + 1, height + margin * 2), dtype=np.bool)
+anchor = np.array([[0, 1, 1, 1, 0],
+                   [1, 1, 1, 1, 1],
+                   [1, 1, 1, 1, 1],
+                   [1, 1, 1, 1, 1],
+                   [0, 1, 1, 1, 0]], dtype=np.bool)
+alignment = np.array([1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0], dtype=np.bool)
+nybbles = [[0, 0, 0, 0, 0], [0, 0, 0, 0, 1], [0, 0, 0, 1, 0], [1, 0, 0, 1, 0],
+           [0, 0, 1, 0, 0], [0, 0, 1, 0, 1], [0, 0, 1, 1, 0], [1, 0, 1, 1, 0],
+           [0, 1, 0, 0, 0], [0, 1, 0, 0, 1], [0, 1, 0, 1, 0], [1, 0, 1, 0, 0],
+           [0, 1, 1, 0, 0], [0, 1, 1, 0, 1], [1, 0, 0, 0, 1], [1, 0, 0, 0, 0]]
+addr = [0x03FF]
+for i in range(1, 54):
+    addr.append(addr[i - 1] ^ ((i & -i) * 0x769))
+    if (i & 0x07) == 0:
+        addr[i] ^= 0x769
+    if (i & 0x0F) == 0:
+        addr[i] ^= 0x769 << 1
+    if (i & 0x1F) == 0:
+        addr[i] ^= (0x769 << 2) ^ 0x769
+
+base = 1 if blocks == 18 else 25
+for i in range(blocks + 1):
+    dots[i * width:i * width + 5, 0:5] = anchor
+    dots[i * width:i * width + 5, height + margin * 2 - 5:height + margin * 2] = anchor
+    dots[i * width + margin, margin + 5] = 1
+    a = addr[base + i]
+    for j in range(16):
+        dots[i * width + margin, margin + 14 + j] = a & (1 << (15 - j))
+for i in range(blocks):
+    dots[i * width:(i + 1) * width, margin] = alignment
+    dots[i * width:(i + 1) * width, height + margin - 1] = alignment
+    block = []
+    for byte in data[i * blocksize:(i + 1) * blocksize]:
+        block.extend(nybbles[byte >> 4])
+        block.extend(nybbles[byte & 0xF])
+    j = 0
+    for y in range(3):
+        dots[i * width + margin + 5:i * width + margin + 31, margin + 2 + y] = block[j:j + 26]
+        j += 26
+    for y in range(26):
+        dots[i * width + margin + 1:i * width + margin + 35, margin + 5 + y] = block[j:j + 34]
+        j += 34
+    for y in range(3):
+        dots[i * width + margin + 5:i * width + margin + 31, margin + 31 + y] = block[j:j + 26]
+        j += 26
+im = PIL.Image.fromarray(dots.T)
+im = PIL.ImageChops.invert(im)
+im.save('dotcode.png')