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Update gdgifexporter (#299)

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Martin Novák 2020-08-08 23:16:03 +02:00 • committed by GitHub
parent da656df5b7
commit e171e2ee65
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 55 additions and 24 deletions
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29
addons/gdgifexporter/gif-lzw/lsbbitpacker.gd
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@ -3,29 +3,22 @@ extends Node
class LSB_LZWBitPacker:
var bit_index: int = 0
var byte: int = 0
var stream: int = 0
var chunks: PoolByteArray = PoolByteArray([])
func get_bit(value: int, index: int) -> int:
return (value >> index) & 1
func set_bit(value: int, index: int) -> int:
return value | (1 << index)
func put_byte():
chunks.append(byte)
bit_index = 0
byte = 0
chunks.append(stream & 0xff)
bit_index -= 8
stream >>= 8
func write_bits(value: int, bits_count: int) -> void:
for i in range(bits_count):
if self.get_bit(value, i) == 1:
byte = self.set_bit(byte, bit_index)
bit_index += 1
if bit_index == 8:
self.put_byte()
value &= (1 << bits_count) - 1
value <<= bit_index
stream |= value
bit_index += bits_count
while bit_index >= 8:
self.put_byte()
func pack() -> PoolByteArray:
if bit_index != 0:
@ -34,5 +27,5 @@ class LSB_LZWBitPacker:
func reset() -> void:
bit_index = 0
byte = 0
stream = 0
chunks = PoolByteArray([])