From 227095a4f710ac6afd43f0a7e8b296f188cf20be Mon Sep 17 00:00:00 2001
From: David Luevano Alvarado <david@luevano.xyz>
Date: Tue, 31 May 2022 21:11:46 -0600
Subject: add working gif maker

---
 .../gdgifexporter/gif-lzw/lsbbitunpacker.gd        | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitunpacker.gd

(limited to 'src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitunpacker.gd')

diff --git a/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitunpacker.gd b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitunpacker.gd
new file mode 100644
index 0000000..9f8507f
--- /dev/null
+++ b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitunpacker.gd
@@ -0,0 +1,41 @@
+extends Reference
+
+
+class LSBLZWBitUnpacker:
+	var chunk_stream: PoolByteArray
+	var bit_index: int = 0
+	var byte: int
+	var byte_index: int = 0
+
+	func _init(_chunk_stream: PoolByteArray):
+		chunk_stream = _chunk_stream
+		self.get_byte()
+
+	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 get_byte():
+		byte = chunk_stream[byte_index]
+		byte_index += 1
+		bit_index = 0
+
+	func read_bits(bits_count: int) -> int:
+		var result: int = 0
+		var result_bit_index: int = 0
+
+		for _i in range(bits_count):
+			if self.get_bit(byte, bit_index) == 1:
+				result = self.set_bit(result, result_bit_index)
+			result_bit_index += 1
+			bit_index += 1
+
+			if bit_index == 8:
+				self.get_byte()
+
+		return result
+
+	func remove_bits(bits_count: int) -> void:
+		self.read_bits(bits_count)
-- 
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