115 lines
3.4 KiB
Python
115 lines
3.4 KiB
Python
from PIL import Image
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from os import path
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from typing import Any, Callable, List, Optional, Protocol, Tuple
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from ..params import (
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ImageParams,
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StageParams,
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)
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from ..utils import (
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ServerContext,
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)
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class StageCallback(Protocol):
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def __call__(
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self,
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ctx: ServerContext,
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stage: StageParams,
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params: ImageParams,
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source: Image.Image,
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**kwargs: Any
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) -> Image.Image:
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pass
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PipelineStage = Tuple[StageCallback, StageParams, Optional[dict]]
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def process_tiles(
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source: Image,
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tile: int,
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scale: int,
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filters: List[Callable],
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) -> 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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print('processing tile %s of %s, %s.%s' % (idx, 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)
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image.paste(tile_image, (left * scale, top * scale))
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return image
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class ChainPipeline:
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'''
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Run many stages in series, passing the image results from each to the next, and processing
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tiles as needed.
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'''
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def __init__(
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self,
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stages: List[PipelineStage] = [],
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):
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'''
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Create a new pipeline that will run the given stages.
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'''
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self.stages = stages
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def append(self, stage: PipelineStage):
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'''
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Append an additional stage to this pipeline.
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'''
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self.stages.append(stage)
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def __call__(self, ctx: ServerContext, params: ImageParams, source: Image.Image) -> Image.Image:
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'''
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TODO: handle List[Image] outputs
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'''
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print('running pipeline on source image with dimensions %sx%s' %
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source.size)
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image = source
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for stage_pipe, stage_params, stage_kwargs in self.stages:
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name = stage_params.name or stage_pipe.__name__
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kwargs = stage_kwargs or {}
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print('running pipeline stage %s on result image with dimensions %sx%s' %
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(name, image.width, image.height))
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if image.width > stage_params.tile_size or image.height > stage_params.tile_size:
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print('source image larger than tile size of %s, tiling stage' % (
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stage_params.tile_size))
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def stage_tile(tile: Image.Image) -> Image.Image:
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tile = stage_pipe(ctx, stage_params, params, tile,
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**kwargs)
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tile.save(path.join(ctx.output_path, 'last-tile.png'))
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return tile
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image = process_tiles(
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image, stage_params.tile_size, stage_params.outscale, [stage_tile])
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else:
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print('source image within tile size, running stage')
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image = stage_pipe(ctx, stage_params, params, image,
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**kwargs)
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print('finished running pipeline stage %s, result size: %sx%s' %
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(name, image.width, image.height))
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print('finished running pipeline, result size: %sx%s' % image.size)
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return image
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