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annotate pytouhou/utils/interpolator.pyx @ 792:11bc22bad1bf

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python: Replace the image crate with png We weren’t using any of its features anyway, so the png crate is exactly what we need, without the many heavy dependencies of image. https://github.com/image-rs/image-png/pull/670 will eventually make it even faster to build.
author Link Mauve <linkmauve@linkmauve.fr>
date Sat, 17 Jan 2026 22:22:25 +0100
parents e15672733c93
children
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15 from libc.stdlib cimport malloc, free
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17
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18 cdef class Interpolator:
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19 def __init__(self, tuple values, unsigned long start_frame=0, tuple end_values=None,
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20 unsigned long end_frame=0, formula=None):
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21 self._length = len(values)
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22 self._values = <double*>malloc(self._length * sizeof(double))
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23 self.start_values = <double*>malloc(self._length * sizeof(double))
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24 self.end_values = <double*>malloc(self._length * sizeof(double))
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25 for i in range(self._length):
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26 self._values[i] = values[i]
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27 self.start_values[i] = self._values[i]
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28 if end_values is not None:
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29 for i in range(self._length):
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30 self.end_values[i] = end_values[i]
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31 self.start_frame = start_frame
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32 self.end_frame = end_frame
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33 self._frame = 0
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34 self._formula = formula
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35
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36
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37 def __dealloc__(self):
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38 free(self.end_values)
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39 free(self.start_values)
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40 free(self._values)
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41
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42
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43 property values:
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44 def __get__(self):
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45 return tuple([self._values[i] for i in range(self._length)])
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48 def __nonzero__(self):
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49 return self._frame < self.end_frame
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52 cpdef set_interpolation_start(self, unsigned long frame, tuple values):
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53 for i in range(self._length):
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54 self.start_values[i] = values[i]
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55 self.start_frame = frame
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58 cpdef set_interpolation_end(self, unsigned long frame, tuple values):
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59 for i in range(self._length):
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60 self.end_values[i] = values[i]
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61 self.end_frame = frame
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64 cpdef set_interpolation_end_frame(self, unsigned long end_frame):
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65 self.end_frame = end_frame
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68 cpdef set_interpolation_end_values(self, tuple values):
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69 for i in range(self._length):
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70 self.end_values[i] = values[i]
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73 cpdef update(self, unsigned long frame):
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74 cdef double coeff
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75
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76 self._frame = frame
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77 if frame + 1 >= self.end_frame: #XXX: skip the last interpolation step
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78 # This bug is replicated from the original game
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79 for i in range(self._length):
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80 self._values[i] = self.end_values[i]
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81 self.start_values[i] = self.end_values[i]
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82 self.start_frame = frame
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83 else:
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84 coeff = float(frame - self.start_frame) / float(self.end_frame - self.start_frame)
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85 if self._formula is not None:
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86 coeff = self._formula(coeff)
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87 for i in range(self._length):
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88 start_value = self.start_values[i]
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89 end_value = self.end_values[i]
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90 self._values[i] = start_value + coeff * (end_value - start_value)