Optimize OnDiskBitMap a bit

[hackapet/Adafruit_Blinka_Displayio.git] / displayio / _helpers.py

diff --git a/displayio/_helpers.py b/displayio/_helpers.py
index 39e1c11c3a7c1bcf1d9c881aa6f82eac73a35df6..2d777303245d7c2672d2058856152d718bf63003 100644 (file)
--- a/displayio/_helpers.py
+++ b/displayio/_helpers.py
@@ -29,3 +29,8 @@ def clamp(value, min_value, max_value):
 def bswap16(value):
     """Swap the bytes in a 16 bit value"""
     return (value & 0xFF00) >> 8 | (value & 0x00FF) << 8
+
+
+def read_word(header: memoryview, index: int) -> int:
+    """Read a 32-bit value from a memoryview cast as 16-bit values"""
+    return header[index] | header[index + 1] << 16