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""" Miscellaneous utilities. """ |
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import os |
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import io |
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import tempfile |
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import pathlib |
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from collections import defaultdict |
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from flask import request, Response, send_file |
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from PIL import Image |
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# --------------------------------------------------------------------- |
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class MsgStore: |
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@ -75,6 +79,60 @@ class TempFile: |
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# --------------------------------------------------------------------- |
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def resize_image_response( resp, default_width=None, default_height=None, default_scaling=None ): |
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"""Resize an image that will be returned as a Flask response.""" |
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assert isinstance( resp, Response ) |
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def get_image(): |
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"""Get the the image from the Flask response that was passed in.""" |
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resp.direct_passthrough = False |
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buf = io.BytesIO() |
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buf.write( resp.get_data() ) |
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buf.seek( 0 ) |
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return Image.open( buf ) |
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# check if the caller specified a width and/or height |
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width = request.args.get( "width", default_width ) |
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height = request.args.get( "height", default_height ) |
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if width and height: |
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# width and height were specified, just use them as-is |
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img = get_image() |
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width = int( width ) |
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height = int( height ) |
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elif width and not height: |
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# width only, calculate the height |
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img = get_image() |
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aspect_ratio = float(img.size[0]) / float(img.size[1]) |
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height = int(width) / aspect_ratio |
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elif not width and height: |
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# height only, calculate the width |
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img = get_image() |
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aspect_ratio = float(img.size[0]) / float(img.size[1]) |
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width = int(height) * aspect_ratio |
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elif not width and not height: |
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# check if the caller specified a scaling factor |
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scaling = request.args.get( "scaling", default_scaling ) |
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if scaling and scaling != 100: |
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img = get_image() |
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width = img.size[0] * float(scaling)/100 |
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height = img.size[1] * float(scaling)/100 |
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# check if we need to resize the image |
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if width or height: |
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assert width and height |
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# yup - make it so |
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img = img.resize( (int(width),int(height)), Image.ANTIALIAS ) |
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buf = io.BytesIO() |
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img.save( buf, format="PNG" ) |
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buf.seek( 0 ) |
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return send_file( buf, mimetype="image/png" ) |
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else: |
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# nope - return the image as-is |
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return resp |
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# --------------------------------------------------------------------- |
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def change_extn( fname, extn ): |
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"""Change a filename's extension.""" |
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return pathlib.Path( fname ).with_suffix( extn ) |
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