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Respect the exif orientation value stored with each image in the mss index #58

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Respect the exif orientation value stored with each image in the mss index #58

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16 changes: 16 additions & 0 deletions iiif/profiles/mss.py
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,15 @@ def __init__(self, source: 'MSSSourceFile', cause: Exception):
super().__init__(f'Failed to convert source image',
log=f'Failed to convert {source.file} ({source.emu_irn}) due to {cause}')

# a set of EXIF orientation values (both raw numbers and textual representations) which,
# if applied to an image, would cause the width and height to swap.
EXIF_ORIENTATION_SWAP_VALUES = {
"5", "Mirror horizontal and rotate 270 CW",
"6", "Rotate 90 CW",
"7", "Mirror horizontal and rotate 90 CW",
"8", "Rotate 270 CW",
}


class MSSImageInfo(ImageInfo):
"""
Expand All @@ -103,6 +112,13 @@ def __init__(self, profile_name: str, name: str, doc: dict):
# a list of the EMu generated derivatives of the original file. The list should already be
# in the ascending (width, height) order because the import process sorts it
self.derivatives = doc.get('derivatives', [])
# exif orientation tag value
self.orientation = doc.get("orientation", None)
if self.orientation in EXIF_ORIENTATION_SWAP_VALUES:
# swap all widths and heights
self.width, self.height = self.height, self.width
for der in self.derivatives:
der["width"], der["height"] = der["height"], der["width"]

def choose_file(self, target_size: Optional[Tuple[int, int]] = None) -> str:
"""
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