90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
from logging import getLogger
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from typing import List, Protocol, Tuple
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from PIL import Image
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logger = getLogger(__name__)
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class TileCallback(Protocol):
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def __call__(self, image: Image.Image, dims: Tuple[int, int, int]) -> Image.Image:
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pass
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def process_tile_grid(
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source: Image.Image,
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tile: int,
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scale: int,
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filters: List[TileCallback],
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) -> Image.Image:
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width, height = source.size
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image = Image.new("RGB", (width * scale, height * scale))
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tiles_x = width // tile
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tiles_y = height // tile
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total = tiles_x * tiles_y
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for y in range(tiles_y):
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for x in range(tiles_x):
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idx = (y * tiles_x) + x
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left = x * tile
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top = y * tile
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logger.info("processing tile %s of %s, %s.%s", idx + 1, total, y, x)
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tile_image = source.crop((left, top, left + tile, top + tile))
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for filter in filters:
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tile_image = filter(tile_image, (left, top, tile))
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image.paste(tile_image, (left * scale, top * scale))
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return image
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def process_tile_spiral(
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source: Image.Image,
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tile: int,
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scale: int,
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filters: List[TileCallback],
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overlap: float = 0.5,
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) -> Image.Image:
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if scale != 1:
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raise Exception("unsupported scale")
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width, height = source.size
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image = Image.new("RGB", (width * scale, height * scale))
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image.paste(source, (0, 0, width, height))
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center_x = (width // 2) - (tile // 2)
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center_y = (height // 2) - (tile // 2)
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# TODO: should add/remove tiles when overlap != 0.5
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tiles = [
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(0, tile * -overlap),
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(tile * overlap, tile * -overlap),
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(tile * overlap, 0),
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(tile * overlap, tile * overlap),
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(0, tile * overlap),
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(tile * -overlap, tile * overlap),
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(tile * -overlap, 0),
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(tile * -overlap, tile * -overlap),
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]
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# tile tuples is source, multiply by scale for dest
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counter = 0
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for left, top in tiles:
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left = center_x + int(left)
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top = center_y + int(top)
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counter += 1
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logger.info("processing tile %s of %s, %sx%s", counter, len(tiles), left, top)
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# TODO: only valid for scale == 1, resize source for others
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tile_image = image.crop((left, top, left + tile, top + tile))
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for filter in filters:
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tile_image = filter(tile_image, (left, top, tile))
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image.paste(tile_image, (left * scale, top * scale))
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return image
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