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78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
"""
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Tests of band mask creation, both .msk sidecar and internal.
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"""
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import pytest
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import rasterio
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from rasterio.enums import MaskFlags
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def test_create_internal_mask(data):
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"""Write an internal mask to the fixture's RGB.byte.tif."""
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with rasterio.Env(GDAL_TIFF_INTERNAL_MASK=True):
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with rasterio.open(str(data.join('RGB.byte.tif')), 'r+') as dst:
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blue = dst.read(1, masked=False)
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mask = 255 * (blue == 0).astype('uint8')
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dst.write_mask(mask)
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# There should be no .msk file
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assert data.join('RGB.byte.tif').exists()
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assert not data.join('RGB.byte.tif.msk').exists()
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# Check that the mask was saved correctly.
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with rasterio.open(str(data.join('RGB.byte.tif'))) as src:
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assert (mask == src.read_masks()).all()
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for flags in src.mask_flags:
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assert flags & MaskFlags.per_dataset
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assert not flags & MaskFlags.alpha
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assert not flags & MaskFlags.nodata
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def test_create_sidecar_mask(data):
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"""Write a .msk sidecar mask."""
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with rasterio.open(str(data.join('RGB.byte.tif')), 'r+') as dst:
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blue = dst.read(1, masked=False)
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mask = 255 * (blue == 0).astype('uint8')
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dst.write_mask(mask)
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# There should be a .msk file in this case.
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assert data.join('RGB.byte.tif').exists()
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assert data.join('RGB.byte.tif.msk').exists()
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# Check that the mask was saved correctly.
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with rasterio.open(str(data.join('RGB.byte.tif'))) as src:
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assert (mask == src.read_masks()).all()
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for flags in src.mask_flags:
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assert flags & MaskFlags.per_dataset
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assert not flags & MaskFlags.alpha
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assert not flags & MaskFlags.nodata
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# Check the .msk file, too.
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with rasterio.open(str(data.join('RGB.byte.tif.msk'))) as msk:
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assert (mask == msk.read(1, masked=False)).all()
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def test_create_mask_windowed_sidecar(data):
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"""Writing masks by window succeeds with sidecar mask
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"""
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with rasterio.Env(GDAL_TIFF_INTERNAL_MASK=False):
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with rasterio.open(str(data.join('RGB.byte.tif')), 'r+') as dst:
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for ij, window in dst.block_windows():
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blue = dst.read(1, window=window, masked=False)
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mask = 255 * (blue == 0).astype('uint8')
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dst.write_mask(mask, window=window)
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@pytest.mark.xfail(reason="https://github.com/mapbox/rasterio/issues/781")
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def test_create_mask_windowed_internal(data):
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"""Writing masks by window with internal mask
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Currently fails with
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rasterio.errors.RasterioIOError: Failed to get mask.
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"""
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with rasterio.Env(GDAL_TIFF_INTERNAL_MASK=True):
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with rasterio.open(str(data.join('RGB.byte.tif')), 'r+') as dst:
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for ij, window in dst.block_windows():
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blue = dst.read(1, window=window, masked=False)
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mask = 255 * (blue == 0).astype('uint8')
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dst.write_mask(mask, window=window)
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