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Empty frame marker

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This commit is contained in:
Ben V. Brown
2022-03-06 21:32:50 +11:00
parent 806e6a266d
commit 29c63fc6f8
1 changed files with 4 additions and 1 deletions
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5
Bootup Logos/img2logo.py
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@@ -22,6 +22,7 @@ LCD_PAGE_SIZE = 1024
DATA_PROGRAMMED_MARKER = 0xAA
FULL_FRAME_MARKER = 0xFF
EMPTY_FRAME_MARKER = 0xFE # If this marker is used to start a frame, the frame is a 0-length delta frame
class MiniwareSettings:
@@ -103,7 +104,9 @@ def get_screen_blob(previous_frame: bytearray, this_frame: bytearray):
"""
outputData = []
delta = calculate_frame_delta_encode(previous_frame, this_frame)
if len(delta) < (len(this_frame)):
if len(delta) == 0:
outputData.append(EMPTY_FRAME_MARKER)
elif len(delta) < (len(this_frame)):
outputData.append(len(delta))
outputData.extend(delta)
# print("delta encoded frame")