Mercurial > hgrepos > Python2 > PyMuPDF

annotate tests/gentle_compare.py @ 39:a6bc019ac0b2 upstream

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ADD: PyMuPDF v1.26.5: the original sdist.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:19:58 +0200
parents 1d09e1dec1d9
children
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1d09e1dec1d9 ADD: PyMuPDF v1.26.4: the original sdist.
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1 import math
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2
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3 import pymupdf
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4
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5
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6 def gentle_compare(w0, w1):
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7 """Check lists of "words" extractions for approximate equality.
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8
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9 * both lists must have same length
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10 * word items must contain same word strings
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11 * word rectangles must be approximately equal
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12 """
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13 tolerance = 1e-3 # maximum (Euclidean) norm of difference rectangle
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14 word_count = len(w0) # number of words
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15 if word_count != len(w1):
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16 print(f"different number of words: {word_count}/{len(w1)}")
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17 return False
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18 for i in range(word_count):
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19 if w0[i][4] != w1[i][4]: # word strings must be the same
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20 print(f"word {i} mismatch")
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21 return False
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22 r0 = pymupdf.Rect(w0[i][:4]) # rect of first word
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23 r1 = pymupdf.Rect(w1[i][:4]) # rect of second word
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24 delta = (r1 - r0).norm() # norm of difference rectangle
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25 if delta > tolerance:
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26 print(f"word {i}: rectangle mismatch {delta}")
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27 return False
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28 return True
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29
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30
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31 def rms(a, b, verbose=None, out_prefix=''):
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32 '''
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33 Returns RMS diff of raw bytes of two sequences.
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34 '''
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35 assert len(a) == len(b)
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36 e = 0
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37 for i, (aa, bb) in enumerate(zip(a, b)):
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38 if verbose and (i % verbose == 0):
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39 print(f'{out_prefix}rms(): {i=} {e=} {aa=} {aa=}.')
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40 e += (aa - bb) ** 2
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41 rms = math.sqrt(e / len(a))
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42 return rms
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43
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44
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45 def pixmaps_rms(a, b, out_prefix=''):
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46 '''
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47 Returns RMS diff of raw bytes of two pixmaps.
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48
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49 We assert that the pixmaps/sequences are the same size.
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50
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51 <a> and <b> can each be a pymupdf.Pixmap or path of a bitmap file.
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52 '''
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53 if isinstance(a, str):
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54 print(f'{out_prefix}pixmaps_rms(): reading pixmap from {a=}.')
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55 a = pymupdf.Pixmap(a)
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56 if isinstance(b, str):
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57 print(f'{out_prefix}pixmaps_rms(): reading pixmap from {b=}.')
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58 b = pymupdf.Pixmap(b)
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59 assert a.irect == b.irect, f'Differing rects: {a.irect=} {b.irect=}.'
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60 a_mv = a.samples_mv
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61 b_mv = b.samples_mv
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62 assert len(a_mv) == len(b_mv)
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63 ret = rms(a_mv, b_mv, out_prefix=out_prefix)
1
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64 print(f'{out_prefix}pixmaps_rms(): {ret=}.')
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65 return ret
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66
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67
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68 def pixmaps_diff(a, b, out_prefix=''):
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69 '''
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70 Returns a pymupdf.Pixmap that represents the difference between pixmaps <a>
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71 and <b>.
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72
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73 Each byte in the returned pixmap is `128 + (b_byte - a_byte) // 2`.
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74 '''
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75 if isinstance(a, str):
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76 print(f'{out_prefix}pixmaps_rms(): reading pixmap from {a=}.')
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77 a = pymupdf.Pixmap(a)
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78 if isinstance(b, str):
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79 print(f'{out_prefix}pixmaps_rms(): reading pixmap from {b=}.')
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80 b = pymupdf.Pixmap(b)
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81 assert a.irect == b.irect, f'Differing rects: {a.irect=} {b.irect=}.'
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82 a_mv = a.samples_mv
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83 b_mv = b.samples_mv
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84 c = pymupdf.Pixmap(a.tobytes())
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85 c_mv = c.samples_mv
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86 assert len(a_mv) == len(b_mv) == len(c_mv)
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87 if 1:
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88 print(f'{len(a_mv)=}')
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89 for i, (a_byte, b_byte, c_byte) in enumerate(zip(a_mv, b_mv, c_mv)):
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90 assert 0 <= a_byte < 256
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91 assert 0 <= b_byte < 256
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92 assert 0 <= c_byte < 256
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93 # Set byte to 128 plus half the diff so we represent the full
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94 # -255..+255 range.
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95 c_mv[i] = 128 + (b_byte - a_byte) // 2
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96 return c