| 1 | /* Copyright (c) 2001, Stanford University
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| 2 | * All rights reserved
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| 3 | *
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| 4 | * See the file LICENSE.txt for information on redistributing this software.
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| 5 | */
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| 6 |
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| 7 | #include "cr_error.h"
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| 8 | #include "cr_warp.h"
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| 9 |
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| 10 | void
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| 11 | crWarpPoint(const float *align, const float *point, float *result)
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| 12 | {
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| 13 | float w, x, y;
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| 14 |
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| 15 | x = align[0] * point[0] + align[1] * point[1] + align[2];
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| 16 | y = align[3] * point[0] + align[4] * point[1] + align[5];
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| 17 | w = align[6] * point[0] + align[7] * point[1] + align[8];
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| 18 |
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| 19 | if (w == 0)
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| 20 | crError("Crud in alignment matrix --> w == 0. bleh!");
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| 21 |
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| 22 | result[0] = x / w;
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| 23 | result[1] = y / w;
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| 24 | }
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