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142 lines
3.9 KiB
142 lines
3.9 KiB
import struct
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import zlib
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from dataclasses import dataclass
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from typing import Sequence, Tuple
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from . import firmware
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try:
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from PIL import Image
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except ImportError:
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Image = None
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RGBPixel = Tuple[int, int, int]
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def _compress(data: bytes) -> bytes:
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z = zlib.compressobj(level=9, wbits=-10)
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return z.compress(data) + z.flush()
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def _decompress(data: bytes) -> bytes:
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return zlib.decompress(data, wbits=-10)
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def _from_pil_rgb(pixels: Sequence[RGBPixel]) -> bytes:
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data = bytearray()
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for r, g, b in pixels:
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c = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3)
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data += struct.pack(">H", c)
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return bytes(data)
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def _to_rgb(data: bytes) -> bytes:
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res = bytearray()
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for i in range(0, len(data), 2):
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(c,) = struct.unpack(">H", data[i : i + 2])
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r = (c & 0xF800) >> 8
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g = (c & 0x07C0) >> 3
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b = (c & 0x001F) << 3
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res += bytes((r, g, b))
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return bytes(res)
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def _from_pil_grayscale(pixels: Sequence[int]) -> bytes:
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data = bytearray()
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for i in range(0, len(pixels), 2):
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left, right = pixels[i], pixels[i + 1]
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c = (left & 0xF0) | ((right & 0xF0) >> 4)
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data += struct.pack(">B", c)
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return bytes(data)
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def _to_grayscale(data: bytes) -> bytes:
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res = bytearray()
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for pixel in data:
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left = pixel & 0xF0
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right = (pixel & 0x0F) << 4
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res += bytes((left, right))
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return bytes(res)
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@dataclass
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class Toif:
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mode: firmware.ToifMode
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size: Tuple[int, int]
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data: bytes
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def __post_init__(self) -> None:
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# checking the data size
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width, height = self.size
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if self.mode is firmware.ToifMode.grayscale:
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expected_size = width * height // 2
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else:
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expected_size = width * height * 2
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uncompressed = _decompress(self.data)
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if len(uncompressed) != expected_size:
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raise ValueError(
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f"Uncompressed data is {len(uncompressed)} bytes, expected {expected_size}"
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)
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def to_image(self) -> "Image":
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if Image is None:
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raise RuntimeError(
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"PIL is not available. Please install via 'pip install Pillow'"
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)
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uncompressed = _decompress(self.data)
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if self.mode is firmware.ToifMode.grayscale:
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pil_mode = "L"
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raw_data = _to_grayscale(uncompressed)
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else:
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pil_mode = "RGB"
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raw_data = _to_rgb(uncompressed)
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return Image.frombuffer(pil_mode, self.size, raw_data, "raw", pil_mode, 0, 1)
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def to_bytes(self) -> bytes:
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width, height = self.size
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return firmware.Toif.build(
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dict(format=self.mode, width=width, height=height, data=self.data)
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)
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def save(self, filename: str) -> None:
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with open(filename, "wb") as out:
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out.write(self.to_bytes())
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def from_bytes(data: bytes) -> Toif:
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parsed = firmware.Toif.parse(data)
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return Toif(parsed.format, (parsed.width, parsed.height), parsed.data)
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def load(filename: str) -> Toif:
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with open(filename, "rb") as f:
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return from_bytes(f.read())
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def from_image(image: "Image", background=(0, 0, 0, 255)) -> Toif:
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if Image is None:
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raise RuntimeError(
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"PIL is not available. Please install via 'pip install Pillow'"
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)
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if image.mode == "RGBA":
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background = Image.new("RGBA", image.size, background)
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blend = Image.alpha_composite(background, image)
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image = blend.convert("RGB")
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if image.mode == "L":
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toif_mode = firmware.ToifMode.grayscale
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toif_data = _from_pil_grayscale(image.getdata())
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elif image.mode == "RGB":
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toif_mode = firmware.ToifMode.full_color
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toif_data = _from_pil_rgb(image.getdata())
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else:
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raise ValueError(f"Unsupported image mode: {image.mode}")
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data = _compress(toif_data)
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return Toif(toif_mode, image.size, data)
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