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conftest.py
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conftest.py
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"""``pytest`` configuration."""
from io import BytesIO
from typing import Sequence
import numpy
import pytest
import rasterio
from rasterio.crs import CRS
from rasterio.enums import ColorInterp
from rasterio.io import MemoryFile
from rasterio.transform import from_bounds
with rasterio.Env() as env:
drivers = env.drivers()
requires_webp = pytest.mark.skipif(
"WEBP" not in drivers.keys(), reason="Only relevant if WEBP drivers is supported"
)
@pytest.fixture
def dataset_fixture():
"""raster fixture."""
def _dataset(
crs: CRS,
bounds: Sequence[float],
dtype: str,
nodata_type: str,
nband: int = 3,
width: int = 256,
height: int = 256,
):
# Data
arr = numpy.zeros((nband, height, width), dtype=dtype) + 1
arr[:, 0:128, 0:128] = 0
# Mask/Alpha
if dtype == "int8":
mask = numpy.zeros((1, height, width), dtype=dtype) + 127
else:
mask = numpy.zeros((1, height, width), dtype=dtype) + 255
mask[:, 0:128, 0:128] = 0
# Input Profile
src_profile = {
"driver": "GTiff",
"count": nband,
"dtype": dtype,
"height": height,
"width": width,
"crs": crs,
"transform": from_bounds(*bounds, width, height),
}
if nodata_type == "nodata":
src_profile["nodata"] = 0
elif nodata_type == "alpha":
src_profile["count"] = nband + 1
with rasterio.Env(GDAL_TIFF_INTERNAL_MASK=True):
with MemoryFile() as memfile:
with memfile.open(**src_profile) as mem:
if nband == 3:
ci = [ColorInterp.red, ColorInterp.green, ColorInterp.blue]
else:
ci = [ColorInterp.gray]
if nband > 1:
ci += [ColorInterp.undefined] * (nband - 1)
if nodata_type == "alpha":
data = numpy.concatenate([arr, mask])
ci += [ColorInterp.alpha]
else:
data = arr
mem.colorinterp = ci
# Write Data
mem.write(data)
# Write Mask
if nodata_type == "mask":
mem.write_mask(mask[0])
return BytesIO(memfile.read())
return _dataset