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annotate pytouhou/ui/sdl/sprite.pyx @ 525:43ecf0f98f4d

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Precalculate the inverse of the texture size at ANM load, to not recalculate at every sprite change.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 18 Dec 2013 18:15:45 +0100
parents 3d4410de78e1
children db28538cd399
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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
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16 from libc.math cimport M_PI as pi
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18
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3d4410de78e1 Remove some useless optimisations now that cython does them for us.
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19 cpdef tuple get_sprite_rendering_data(Sprite sprite):
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20 cdef double x, y, tx, ty, tw, th, sx, sy, rz, tox, toy
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21
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22 if not sprite.changed:
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23 return sprite._rendering_data
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24
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25 x = 0
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26 y = 0
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27
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28 tx, ty, tw, th = sprite.texcoords
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29 sx, sy = sprite.rescale
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30 width = sprite.width_override or (tw * sx)
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31 height = sprite.height_override or (th * sy)
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32
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33 rz = sprite.rotations_3d[2]
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34 if sprite.automatic_orientation:
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35 rz += pi/2. - sprite.angle
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36 elif sprite.force_rotation:
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37 rz += sprite.angle
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38
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39 if sprite.allow_dest_offset:
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40 x += sprite.dest_offset[0]
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41 y += sprite.dest_offset[1]
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42 if not sprite.corner_relative_placement: # Reposition
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43 x -= width / 2
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44 y -= height / 2
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45
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46 x_1 = sprite.anm.size_inv[0]
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47 y_1 = sprite.anm.size_inv[1]
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48 tox, toy = sprite.texoffsets
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49 uvs = (tx * x_1 + tox,
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50 (tx + tw) * x_1 + tox,
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51 ty * y_1 + toy,
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52 (ty + th) * y_1 + toy)
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53
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54 key = sprite.blendfunc
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55 r, g, b = sprite.color
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56 values = (x, y, width, height), uvs, (r, g, b, sprite.alpha), -rz * 180 / pi, sprite.mirrored
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57 sprite._rendering_data = key, values
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58 sprite.changed = False
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59
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60 return sprite._rendering_data