From 1bb8b7eda56de815bcfc9c6f8b07df399cf400a0 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Wed, 22 Mar 2023 18:34:53 +0100
Subject: fix endianness in `tilepack` and add `tilemap2png` script for
 previewing finished tilemap

---
 scripts/tilemap2png | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 scripts/tilepack    |  4 ++--
 2 files changed, 49 insertions(+), 2 deletions(-)
 create mode 100755 scripts/tilemap2png

diff --git a/scripts/tilemap2png b/scripts/tilemap2png
new file mode 100755
index 0000000..e37bfab
--- /dev/null
+++ b/scripts/tilemap2png
@@ -0,0 +1,47 @@
+#!/bin/python3
+# read packed tilemap file from stdin and output png on stdout
+
+import sys
+import io
+import struct
+from PIL import Image
+
+color_map = (
+	(0x00, 0x00, 0x00),
+	(0x24, 0x24, 0x24),
+	(0x49, 0x49, 0x49),
+	(0x6d, 0x6d, 0x6d),
+	(0x92, 0x92, 0x92),
+	(0xb6, 0xb6, 0xb6),
+	(0xda, 0xda, 0xda),
+	(0xff, 0xff, 0xff),
+)
+
+buf = []
+for byte in sys.stdin.buffer.read():
+	buf.append(byte)
+
+size_horizontal = 16 * 16
+size_vertical = ((len(buf) // 104) // 16 + 1) * 16
+img = Image.new('RGB', (size_horizontal, size_vertical))
+
+i = 0
+sprite_idx = 0
+for x in range(0, len(buf), 2):
+	word = 0x0000
+	word |= buf[x]
+	word |= buf[x+1] << 8
+
+	for p in range(5):
+		img.putpixel(((i % 16) + (16 * (sprite_idx % 16)), (i // 16) + (16 * (sprite_idx // 16))), color_map[(word >> (p * 3)) & 0b111])
+		i += 1
+		if i > 0xff:
+			i = 0
+			sprite_idx += 1
+			break
+
+with io.BytesIO() as out:
+	img.save(out, format="PNG")
+	sys.stdout.buffer.write(out.getvalue())
+	sys.stdout.buffer.flush()
+
diff --git a/scripts/tilepack b/scripts/tilepack
index aff417d..a07cbb6 100755
--- a/scripts/tilepack
+++ b/scripts/tilepack
@@ -11,8 +11,8 @@ for byte in sys.stdin.buffer.read():
 	pixel_idx = i % 5
 	word |= (byte & 0b111) << 3 * pixel_idx
 
-	if i % 5 == 4 or i == 0xff:
-		sys.stdout.buffer.write(struct.pack('!H', word))
+	if pixel_idx == 4 or i == 0xff:
+		sys.stdout.buffer.write(struct.pack('<H', word))
 		word = 0x0000
 
 	i += 1
-- 
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