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annotate Resources/TestIIIFTiles.py @ 274:2805246064aa iiif

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added SetIIIFForcePowersOfTwoScaleFactors()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 Jul 2023 11:24:56 +0200
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274
2805246064aa added SetIIIFForcePowersOfTwoScaleFactors()
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1 #!/usr/bin/env python3
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2
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3 import requests
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4 import sys
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5
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6 if len(sys.argv) != 2:
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7 print('Usage: %s <URL to info.json>' % sys.argv[0])
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8 exit(-1)
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9
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10 r = requests.get(sys.argv[1])
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11 r.raise_for_status()
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12
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13 info = r.json()
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14
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15 assert(len(info['tiles']) == 1)
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16 assert(len(info['tiles'][0]['scaleFactors']) == len(info['sizes']))
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17
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18 width = None
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19 height = None
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20 for size in info['sizes']:
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21 if (width == None or
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22 size['width'] > width):
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23 width = size['width']
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24 height = size['height']
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25
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26 tw = info['tiles'][0]['width']
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27 th = info['tiles'][0]['height']
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28
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29 assert(isinstance(width, int))
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30 assert(isinstance(height, int))
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31 assert(isinstance(tw, int))
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32 assert(isinstance(th, int))
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33
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34 def CeilingDivision(a, b):
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35 if a % b == 0:
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36 return a // b
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37 else:
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38 return a // b + 1
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39
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40 for s in info['tiles'][0]['scaleFactors']:
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41 assert(isinstance(s, int))
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42
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43 countTilesX = CeilingDivision(width, tw * s)
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44 countTilesY = CeilingDivision(height, th * s)
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45 print(tw * s, th * s, countTilesX, countTilesY)
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46
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47 for m in range(countTilesY):
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48 for n in range(countTilesX):
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49
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50 # Reference:
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51 # https://iiif.io/api/image/3.0/implementation/#3-tile-region-parameter-calculation
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52
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53 # Calculate region parameters /xr,yr,wr,hr/
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54 xr = n * tw * s
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55 yr = m * th * s
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56 wr = tw * s
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57 if (xr + wr > width):
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58 wr = width - xr
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59 hr = th * s
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60 if (yr + hr > height):
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61 hr = height - yr
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62
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63 # Calculate size parameters /ws,hs/
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64 ws = tw
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65 if (xr + tw*s > width):
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66 ws = (width - xr + s - 1) / s # +s-1 in numerator to round up
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67 hs = th
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68 if (yr + th*s > height):
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69 hs = (height - yr + s - 1) / s
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70
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71 url = '%s/%d,%d,%d,%d/%d,%d/0/default.jpg' % (info['id'], xr, yr, wr, hr, ws, hs)
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72 r = requests.get(url)
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73
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74 if r.status_code == 200:
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75 print('SUCCESS: %s' % url)
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76 else:
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77 print('ERROR: %s' % url)