# HG changeset patch
# User David Boddie <david@boddie.org.uk>
# Date 1345933130 -7200
# Node ID b74ffb65fb883a002977305bade435da192837f6
# Parent  8862c859a18a6b1296d893197cfaf1b6932c1dec
Added more sprites for the Atom and a script to convert them to screen data.

diff -r 8862c859a18a -r b74ffb65fb88 images/atom/demise1.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/demise2.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/demise3.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/demise4.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/down1.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/down2.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/left1.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/left2.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/right1.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/right2.png
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diff -r 8862c859a18a -r b74ffb65fb88 images/atom/up1.png
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diff -r 8862c859a18a -r b74ffb65fb88 tools/atom/makesprites.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/atom/makesprites.py	Sun Aug 26 00:18:50 2012 +0200
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+
+"""
+Copyright (C) 2012 David Boddie <david@boddie.org.uk>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+""" Information provided by Kees van Oss:
+
+                 BBC            ATOM
+TILES          16 x 24   ->   12 x 16
+PLAYER          8 x 24   ->    8 x 16
+PROJECTILE      8 x  8   ->    8 x  8
+ENEMIES        16 x 16   ->   12 x 12
+WEAPONS        16 x 16   ->   12 x 12
+TREASURE       16 x 16   ->   12 x 12
+EXIT           16 x 24   ->   12 x 16
+
+Hex:    $a0     ,     $80     ,     $aa 
+Bin:%10 10 00 00, %10 00 00 00, %10 10 10 10
+Col: BL BL GR GR   BL GR GR GR   BL BL BL BL
+
+00 = GR = GREEN, 01 = YE = YELLOW, 10 = BL = BLUE, 11 = RE = RED
+"""
+
+import os, sys
+import Image
+
+# Map RGB values to the appropriate values for the Atom palette.
+palette = {"\x00\x00\x00": 2, "\xff\x00\x00": 3,
+           "\x00\x80\x00": 0, "\xff\xff\x00": 2}
+
+if __name__ == "__main__":
+
+    this_dir = os.path.split(os.path.abspath(__file__))[0]
+    image_dir = os.path.join(this_dir, os.path.pardir, os.path.pardir, "images", "atom")
+    
+    sprites = ""
+    
+    for file_name in os.listdir(image_dir):
+    
+        if file_name.endswith(".png"):
+        
+            im = Image.open(os.path.join(image_dir, file_name))
+            im = im.convert("RGB")
+            data = im.tostring()
+            k = 0
+            
+            sprite = ""
+            
+            for i in range(im.size[1]):
+            
+                # Initialise the byte value for insertion into the sprite data.
+                byte = 0
+                # The offset into the byte for each pixel starts at the highest
+                # two bits.
+                offset = 6
+                
+                for j in range(im.size[0]):
+                
+                    rgb = data[k:k+3]
+                    v = palette[rgb]
+                    byte = byte | (v << offset)
+                    
+                    if offset == 0:
+                        # For the last pixel in a byte, insert it into the sprite
+                        # data, and reset the offset and byte values.
+                        sprite += chr(byte)
+                        offset = 6
+                    else:
+                        # Otherwise, decrease the offset into the byte to accept
+                        # data for the next pixel.
+                        offset -= 2
+                    
+                    k += 3
+                
+                if offset != 6:
+                    # If the current byte has not been added to the sprite data,
+                    # add it now.
+                    sprite += chr(byte)
+            
+            # Add the sprite data to the collection.
+            sprites += sprite
+    
+    # Write the sprite data to a file.
+    open("sprites.data", "w").write(sprites)
+    
+    sys.exit()