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(svn r27138) -Fix: [NewGRF] Negative positions in industry layouts were interpreted incorrectly; however since the wrong behaviour is saner, define as the correct behaviour for GRFv8.

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frosch 2015-02-06 21:56:50 +00:00
parent 4846c7ed6b
commit c655847235
1 changed files with 9 additions and 0 deletions
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9
src/newgrf.cpp
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@ -3471,6 +3471,15 @@ static ChangeInfoResult IndustriesChangeInfo(uint indid, int numinfo, int prop,
} else if (itt[k].gfx == 0xFF) {
itt[k].ti.x = (int8)GB(itt[k].ti.x, 0, 8);
itt[k].ti.y = (int8)GB(itt[k].ti.y, 0, 8);
/* When there were only 256x256 maps, TileIndex was a uint16 and
* itt[k].ti was just a TileIndexDiff that was added to it.
* As such negative "x" values were shifted into the "y" position.
* x = -1, y = 1 -> x = 255, y = 0
* Since GRF version 8 the position is interpreted as pair of independent int8.
* For GRF version < 8 we need to emulate the old shifting behaviour.
*/
if (_cur.grffile->grf_version < 8 && itt[k].ti.x < 0) itt[k].ti.y += 1;
}
}