96 lines
2.7 KiB
Python
96 lines
2.7 KiB
Python
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from PIL import Image
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from os import path
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from typing import Any, List, Optional, Protocol, Tuple
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from .image import (
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process_tiles,
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)
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from .utils import (
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ImageParams,
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ServerContext,
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)
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class StageParams:
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'''
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Parameters for a pipeline stage, assuming they can be chained.
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'''
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def __init__(
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self,
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tile_size: int = 512,
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outscale: int = 1,
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) -> None:
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self.tile_size = tile_size
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self.outscale = outscale
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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[Any]]
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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_fn, stage_params, stage_kwargs in self.stages:
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print('running pipeline stage on result image with dimensions %sx%s' %
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image.size)
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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, 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_fn(ctx, stage_params, tile,
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params, **stage_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, run stage')
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image = stage_fn(ctx, stage_params, image,
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params, **stage_kwargs)
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print('finished running pipeline stage, result size: %sx%s' % image.size)
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print('finished running pipeline, result size: %sx%s' % image.size)
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return image
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