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jpegio_decompress.py

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import io

from displayio import Bitmap

import binascii

import jpegio

import bitmaptools

content = binascii.a2b_base64(

b"""

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AhEBAxEB/8QAGgABAAMBAQEAAAAAAAAAAAAAAAIDBAEFBv/EACsQAAICAQMDAwMEAwAAAAAAAAAB

AgMREiExBEFREyJhMkJSBTNxgRRikf/EABgBAQEBAQEAAAAAAAAAAAAAAAACAQME/8QAIxEBAQAC

AgICAgMBAAAAAAAAAAECEQMSITFBURMiMmFxof/aAAwDAQACEQMRAD8A8oAAAAAAAAAAAAAB2MXJ

7FsafLNktbpSC/0oh0rsb0pqqATlU1xuQJs0wAAAAAAAAAAAAAAAAAAAAAAAAAAADDfY6oSfYDh2

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VHGzVRQAGMAAAAAAAAAAAAAAAAAAAC5AA0rSltgOcU8ZK61GSw+STqWcnWW68LWAAtqdE9F0ZeGV

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pfSzKc805AAISAAAAAAAAAAAAAAAAAAAAABZCU2ttytLLwXWPRFQj/Zs8KxnzXVOX4ndUvxM+X5Z

JWSXcqZG161PnY6lgpVsu5ZCxS/kqZStlTABbQAARseIMzF9zxAoOWftGQACGAAAAAAAAAAAAAAA

AAAAAACyiOZanwiE3qk2S9RqGldyAVbNSQAASHYvDTOCKy0BrXAC4B3dAAGim97pFRKx5myJwyu6

igAMYAAAAAAAAAAAAAAAAAAAAAAAAAAAWUxzLPgrNtENMF5ZuPt048O9RBKfJE7NymroIzeItkim

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kUVSULnHOzM4G3S81uv6elhnCqjqm0oz5L9fwi5qu2PJnlNyf9VOuTeUiBpVj8FEovLZe443HPdt

nhEjKKksMkAlXCfpvTNbeTTXpypLcpaTWGV4lU8xlt4J8xUykmrPDbalJor0IqXVZfvRZG2EuJGd

tuvDMOki6rCTWCtxTfBODWHuiOTbfBhhj3yrmleC1vNZXleTrsiq95ISt5ccf1/1w6uUUy6iC43K

pdTL7VgncVny4ya212NJ7vBms6hLaH/SiU5TeZPJEy5beb8tmMxjrbk8t5OAEuQAAAAAAAAAAAAA

E4XThw9iADZbPTTHqvKJf5EPkyA3ddZzZxqd1bIO6PZMoBvapvJasdrfGxW23ywDLbXPYADB1Sa4

bGuXlnADbup+WcAAAAAAAAAAAAD/2Q=="""

)

decoder = jpegio.JpegDecoder()

def dump_bitmap(b):

w = b.width

h = b.height

for y in range(min(30, h)):

for x in range(min(72, w)):

print(end="#" if (b[x, y] & 0x7E0) < 0x400 else " ")

print("..." if w > 72 else "")

print("...\n" if h > 24 else "")

def test(jpeg_input, scale, fill=0xFFFF, **position_and_crop):

w, h = decoder.open(jpeg_input)

w >>= scale

h >>= scale

print(f"{w}x{h}")

b = Bitmap(w, h, 65535)

b.fill(fill)

decoder.decode(b, scale=scale, **position_and_crop)

if position_and_crop:

position_and_crop.setdefault("x", 0)

position_and_crop.setdefault("y", 0)

full = Bitmap(w, h, 65535)

decoder.open(jpeg_input)

decoder.decode(full, scale=scale)

refb = Bitmap(w, h, 65535)

refb.fill(fill)

bitmaptools.blit(refb, full, **position_and_crop)

print(f"{memoryview(refb) == memoryview(b)=}")

if not memoryview(refb) == memoryview(b):

dump_bitmap(b)

else:

dump_bitmap(b)

class IOAdapter(io.IOBase):

def __init__(self, content):

self._content = memoryview(content).cast("b")

self._pos = 0

def readinto(self, buf):

pos = self._pos

data = self._content[pos : pos + len(buf)]

len_data = len(data)

buf[:len_data] = data

self._pos = pos + len_data

return len_data

print("bytes")

test(content, scale=0)

test(content, scale=1)

test(content, scale=2)

test(content, scale=3)

bytesio = io.BytesIO(content)

print("BytesIO")

test(io.BytesIO(content), scale=3)

ioadapter = IOAdapter(content)

print("IOAdapter")

test(io.BytesIO(content), scale=3)

print("crop & move")

test(content, scale=3, x=8, y=12)

test(content, scale=3, x1=8, y1=12)

test(content, scale=3, x2=16, y2=16)

test(content, scale=3, x=12, y=16, x1=8, y1=12, x2=16, y2=16)

print("color key")

test(content, scale=0, skip_source_index=0x4529, fill=0)