1 files changed, 31 insertions, 0 deletions
diff --git a/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitpacker.gd b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitpacker.gd
new file mode 100644
index 0000000..3141d09
--- /dev/null
+++ b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/gif-lzw/lsbbitpacker.gd
@@ -0,0 +1,31 @@
+extends Reference
+
+
+class LSBLZWBitPacker:
+	var bit_index: int = 0
+	var stream: int = 0
+
+	var chunks: PoolByteArray = PoolByteArray([])
+
+	func put_byte():
+		chunks.append(stream & 0xff)
+		bit_index -= 8
+		stream >>= 8
+
+	func write_bits(value: int, bits_count: int) -> void:
+		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:
+			self.put_byte()
+		return chunks
+
+	func reset() -> void:
+		bit_index = 0
+		stream = 0
+		chunks = PoolByteArray([])