mirror of
https://github.com/MarioSpore/Grinch-AP.git
synced 2025-10-21 20:21:32 -06:00
70 lines
2.9 KiB
Python
70 lines
2.9 KiB
Python
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class BackgroundEditor:
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def __init__(self, rom, index, *, attributes=False):
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self.__index = index
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self.__is_attributes = attributes
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self.tiles = {}
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if attributes:
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data = rom.background_attributes[index]
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else:
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data = rom.background_tiles[index]
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idx = 0
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while data[idx] != 0x00:
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addr = data[idx] << 8 | data[idx + 1]
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amount = (data[idx + 2] & 0x3F) + 1
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repeat = (data[idx + 2] & 0x40) == 0x40
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vertical = (data[idx + 2] & 0x80) == 0x80
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idx += 3
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for n in range(amount):
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self.tiles[addr] = data[idx]
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if not repeat:
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idx += 1
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addr += 0x20 if vertical else 0x01
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if repeat:
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idx += 1
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def dump(self):
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if not self.tiles:
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return
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low = min(self.tiles.keys()) & 0xFFE0
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high = (max(self.tiles.keys()) | 0x001F) + 1
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print("0x%02x " % (self.__index) + "".join(map(lambda n: "%2X" % (n), range(0x20))))
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for addr in range(low, high, 0x20):
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print("%04x " % (addr) + "".join(map(lambda n: ("%02X" % (self.tiles[addr + n])) if addr + n in self.tiles else " ", range(0x20))))
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def store(self, rom):
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# NOTE: This is not a very good encoder, but the background back has so much free space that we really don't care.
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# Improvements can be done to find long sequences of bytes and store those as repeated.
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result = bytearray()
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low = min(self.tiles.keys())
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high = max(self.tiles.keys()) + 1
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while low < high:
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if low not in self.tiles:
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low += 1
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continue
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different_count = 1
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while low + different_count in self.tiles and different_count < 0x40:
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different_count += 1
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same_count = 1
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while low + same_count in self.tiles and self.tiles[low] == self.tiles[low + same_count] and same_count < 0x40:
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same_count += 1
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if same_count > different_count - 4 and same_count > 2:
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result.append(low >> 8)
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result.append(low & 0xFF)
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result.append((same_count - 1) | 0x40)
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result.append(self.tiles[low])
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low += same_count
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else:
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result.append(low >> 8)
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result.append(low & 0xFF)
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result.append(different_count - 1)
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for n in range(different_count):
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result.append(self.tiles[low + n])
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low += different_count
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result.append(0x00)
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if self.__is_attributes:
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rom.background_attributes[self.__index] = result
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else:
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rom.background_tiles[self.__index] = result
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