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|
#! /usr/bin/env python3
##
## gbimg - turn PC image files into Game Boy tilesets
## Copyright (C) 2016 Delwink, LLC
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU Affero General Public License as published by
## the Free Software Foundation, version 3 only.
##
## 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 Affero General Public License for more details.
##
## You should have received a copy of the GNU Affero General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
##
from wand.image import Image
_PALETTE = {
0: 3,
85: 2,
170: 1,
255: 0
}
def map_palette(color):
if color not in _PALETTE:
raise ValueError('{} is not a valid color level'.format(color))
return _PALETTE[color]
class Tileset:
def __init__(self, img, data, bank=None):
self._img = img
self._data = None
self._data_var = data
if type(bank) is str:
self._bank_var = bank
self._bank_num = None
elif type(bank) is int:
self._bank_var = None
self._bank_num = bank
elif bank is None:
self._bank_var = None
self._bank_num = None
else:
raise TypeError('bank must be str, int, or None')
def set_bank_num(self, num):
self._bank_num = num
def _convert(self):
with Image(filename=self._img) as img:
width, height = img.size
if height != 8:
raise ValueError('{} height is {}'.format(self, height))
num_tiles = width / 8
if num_tiles % 1 != 0:
raise ValueError('Irregular tile width in {}'.format(self))
num_tiles = int(num_tiles)
img.depth = 8
blob = img.make_blob(format='RGB')
encoded = []
for tile in range(num_tiles):
encoded_tile = []
for i in range(0, width * 8 * 3, width * 3):
byte1 = 0
byte2 = 0
bit = 0x80
for j in range(0, 8 * 3, 3):
color = map_palette(blob[(i + j) + ((8 * 3) * tile)])
if color & 0x01:
byte1 |= bit
if color & 0x02:
byte2 |= bit
bit >>= 1
encoded_tile.append(byte1)
encoded_tile.append(byte2)
encoded += encoded_tile
return bytes(encoded)
@property
def data(self):
if not self._data:
self._data = self._convert()
return self._data
@property
def image_file(self):
return self._img
@property
def data_var(self):
return self._data_var
@property
def bank_var(self):
return self._bank_var
@property
def bank_num(self):
return self._bank_num
def __len__(self):
return len(self.data)
def __str__(self):
return 'Tileset ' + self.image_file
|
