53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
from __future__ import annotations
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import numpy as np
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from backend.node_registry import register_node
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from backend.data_types import DataField
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@register_node(display_name="Resample")
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class Resample:
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@classmethod
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def INPUT_TYPES(cls):
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return {
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"required": {
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"field": ("DATA_FIELD",),
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"width": ("INT", {"default": 256, "min": 2, "max": 16384, "step": 1}),
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"height": ("INT", {"default": 256, "min": 2, "max": 16384, "step": 1}),
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"interpolation": (["linear", "cubic", "nearest"], {"default": "linear"}),
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}
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}
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OUTPUTS = (
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('DATA_FIELD', 'resampled'),
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)
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FUNCTION = "process"
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DESCRIPTION = (
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"Resample a DATA_FIELD to a new pixel resolution while preserving physical dimensions. "
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"Physical size (xreal, yreal) is unchanged; pixel size dx/dy scales accordingly. "
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"Equivalent to gwy_data_field_new_resampled with GWY_INTERPOLATION_LINEAR / "
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"GWY_INTERPOLATION_CUBIC / GWY_INTERPOLATION_ROUND (scale.c)."
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)
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_ORDERS = {"nearest": 0, "linear": 1, "cubic": 3}
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def process(self, field: DataField, width: int, height: int, interpolation: str) -> tuple:
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from scipy.ndimage import zoom
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if interpolation not in self._ORDERS:
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raise ValueError(
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f"Unknown interpolation {interpolation!r}. "
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f"Choose from: {list(self._ORDERS)}"
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)
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old_yres, old_xres = field.data.shape
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zy = height / old_yres
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zx = width / old_xres
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result = zoom(field.data, (zy, zx), order=self._ORDERS[interpolation])
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# Physical dimensions stay the same; xres/yres are re-derived from data.shape.
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return (field.replace(data=result, xreal=field.xreal, yreal=field.yreal),)
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