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resize: added upscaling params for h & w #100

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Aug 26, 2024
Merged

resize: added upscaling params for h & w #100

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26 changes: 20 additions & 6 deletions flask_iiif/api.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,9 +152,14 @@ def resize(self, dimensions, resample=None):
width = max(1, int(real_width * percent))
height = max(1, int(real_height * percent))

# Check if it is `,h`
elif dimensions.startswith(","):
height = int(dimensions[1:])
# Check if it is `,h` or `^,h`,
# the '^' case is handled the same way as just height being present
elif dimensions.startswith((",", "^,")):
if dimensions.startswith(","): # Handle `,h`
height = int(dimensions[1:])
else: # Handle `^,h`
height = int(dimensions[2:])

# find the ratio
ratio = self.reduce_by(height, real_height)
# calculate width (minimum 1)
Expand All @@ -172,9 +177,18 @@ def resize(self, dimensions, resample=None):
width = max(1, int(real_width * ratio))
height = max(1, int(real_height * ratio))

# Check if it is `w,`
elif dimensions.endswith(","):
width = int(dimensions[:-1])
# Check if it is `w,` or `^w,`
# the '^' case is handled the same way as just width being present
elif dimensions.endswith(",") or (
(dimensions.startswith("^") and dimensions.endswith(","))
):
if dimensions.endswith(",") and not dimensions.startswith(
"^"
): # Handle `w,`
width = int(dimensions[:-1])
else: # Handle `^w,`
width = int(dimensions[1:-1])

# find the ratio
ratio = self.reduce_by(width, real_width)
# calculate the height
Expand Down