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    13.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
    13.2 +++ b/tools/atom/makesprites.py	Sun Aug 26 00:18:50 2012 +0200
    13.3 @@ -0,0 +1,100 @@
    13.4 +#!/usr/bin/env python
    13.5 +
    13.6 +"""
    13.7 +Copyright (C) 2012 David Boddie <david@boddie.org.uk>
    13.8 +
    13.9 +This program is free software: you can redistribute it and/or modify
   13.10 +it under the terms of the GNU General Public License as published by
   13.11 +the Free Software Foundation, either version 3 of the License, or
   13.12 +(at your option) any later version.
   13.13 +
   13.14 +This program is distributed in the hope that it will be useful,
   13.15 +but WITHOUT ANY WARRANTY; without even the implied warranty of
   13.16 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13.17 +GNU General Public License for more details.
   13.18 +
   13.19 +You should have received a copy of the GNU General Public License
   13.20 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
   13.21 +"""
   13.22 +
   13.23 +""" Information provided by Kees van Oss:
   13.24 +
   13.25 +                 BBC            ATOM
   13.26 +TILES          16 x 24   ->   12 x 16
   13.27 +PLAYER          8 x 24   ->    8 x 16
   13.28 +PROJECTILE      8 x  8   ->    8 x  8
   13.29 +ENEMIES        16 x 16   ->   12 x 12
   13.30 +WEAPONS        16 x 16   ->   12 x 12
   13.31 +TREASURE       16 x 16   ->   12 x 12
   13.32 +EXIT           16 x 24   ->   12 x 16
   13.33 +
   13.34 +Hex:    $a0     ,     $80     ,     $aa 
   13.35 +Bin:%10 10 00 00, %10 00 00 00, %10 10 10 10
   13.36 +Col: BL BL GR GR   BL GR GR GR   BL BL BL BL
   13.37 +
   13.38 +00 = GR = GREEN, 01 = YE = YELLOW, 10 = BL = BLUE, 11 = RE = RED
   13.39 +"""
   13.40 +
   13.41 +import os, sys
   13.42 +import Image
   13.43 +
   13.44 +# Map RGB values to the appropriate values for the Atom palette.
   13.45 +palette = {"\x00\x00\x00": 2, "\xff\x00\x00": 3,
   13.46 +           "\x00\x80\x00": 0, "\xff\xff\x00": 2}
   13.47 +
   13.48 +if __name__ == "__main__":
   13.49 +
   13.50 +    this_dir = os.path.split(os.path.abspath(__file__))[0]
   13.51 +    image_dir = os.path.join(this_dir, os.path.pardir, os.path.pardir, "images", "atom")
   13.52 +    
   13.53 +    sprites = ""
   13.54 +    
   13.55 +    for file_name in os.listdir(image_dir):
   13.56 +    
   13.57 +        if file_name.endswith(".png"):
   13.58 +        
   13.59 +            im = Image.open(os.path.join(image_dir, file_name))
   13.60 +            im = im.convert("RGB")
   13.61 +            data = im.tostring()
   13.62 +            k = 0
   13.63 +            
   13.64 +            sprite = ""
   13.65 +            
   13.66 +            for i in range(im.size[1]):
   13.67 +            
   13.68 +                # Initialise the byte value for insertion into the sprite data.
   13.69 +                byte = 0
   13.70 +                # The offset into the byte for each pixel starts at the highest
   13.71 +                # two bits.
   13.72 +                offset = 6
   13.73 +                
   13.74 +                for j in range(im.size[0]):
   13.75 +                
   13.76 +                    rgb = data[k:k+3]
   13.77 +                    v = palette[rgb]
   13.78 +                    byte = byte | (v << offset)
   13.79 +                    
   13.80 +                    if offset == 0:
   13.81 +                        # For the last pixel in a byte, insert it into the sprite
   13.82 +                        # data, and reset the offset and byte values.
   13.83 +                        sprite += chr(byte)
   13.84 +                        offset = 6
   13.85 +                    else:
   13.86 +                        # Otherwise, decrease the offset into the byte to accept
   13.87 +                        # data for the next pixel.
   13.88 +                        offset -= 2
   13.89 +                    
   13.90 +                    k += 3
   13.91 +                
   13.92 +                if offset != 6:
   13.93 +                    # If the current byte has not been added to the sprite data,
   13.94 +                    # add it now.
   13.95 +                    sprite += chr(byte)
   13.96 +            
   13.97 +            # Add the sprite data to the collection.
   13.98 +            sprites += sprite
   13.99 +    
  13.100 +    # Write the sprite data to a file.
  13.101 +    open("sprites.data", "w").write(sprites)
  13.102 +    
  13.103 +    sys.exit()