From 7a5e2cd5f5003e8ca9a0fc3dac14a74b81287881 Mon Sep 17 00:00:00 2001 From: junyanz Date: Mon, 15 Jan 2018 20:36:47 -0500 Subject: remove unused code --- util/png.py | 34 ---------------------------------- 1 file changed, 34 deletions(-) delete mode 100644 util/png.py (limited to 'util/png.py') diff --git a/util/png.py b/util/png.py deleted file mode 100644 index 3a750c0..0000000 --- a/util/png.py +++ /dev/null @@ -1,34 +0,0 @@ -import struct -import zlib - - -def encode(buf, width, height): - """ buf: must be bytes or a bytearray in py3, a regular string in py2. formatted RGBRGB... """ - assert (width * height * 3 == len(buf)) - bpp = 3 - - def raw_data(): - # reverse the vertical line order and add null bytes at the start - row_bytes = width * bpp - for row_start in range((height - 1) * width * bpp, -1, -row_bytes): - yield b'\x00' - yield buf[row_start:row_start + row_bytes] - - def chunk(tag, data): - return [ - struct.pack("!I", len(data)), - tag, - data, - struct.pack("!I", 0xFFFFFFFF & zlib.crc32(data, zlib.crc32(tag))) - ] - - SIGNATURE = b'\x89PNG\r\n\x1a\n' - COLOR_TYPE_RGB = 2 - COLOR_TYPE_RGBA = 6 - bit_depth = 8 - return b''.join( - [SIGNATURE] + - chunk(b'IHDR', struct.pack("!2I5B", width, height, bit_depth, COLOR_TYPE_RGB, 0, 0, 0)) + - chunk(b'IDAT', zlib.compress(b''.join(raw_data()), 9)) + - chunk(b'IEND', b'') - ) -- cgit v1.2.3-70-g09d2