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annotate dmline.c @ 234:a2abd0b991b6

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Modularize line drawing related templates and functions, add clipping functions to dmlib.h.
author Matti Hamalainen <ccr@tnsp.org>
date Mon, 08 Oct 2012 15:21:59 +0300
parents 79dac918c81e
children 9d015d32841a
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1 /*
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2 * DMLib
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3 * -- Arbitrary line drawing functions
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2011 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmlib.h"
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8
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9 /* Clip line coordinates. Return value:
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10 * = 0 : No clipping needed.
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11 * > 0 : Clipped. Line partially inside the clipping area.
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12 * < 0 : Line completely outside the clipping area.
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13 */
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14 #define dmClipBits(Q, x, y) \
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15 do { \
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16 Q = 0; \
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17 if (x < clipX0) Q |= 1; \
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18 else \
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19 if (x > clipX1) Q |= 2; \
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20 if (y < clipY0) Q |= 4; \
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21 else \
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22 if (y > clipY1) Q |= 8; \
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23 } while (0)
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24
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25 #define xA (*x0)
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26 #define xB (*x1)
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27 #define yA (*y0)
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28 #define yB (*y1)
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29
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30 #define DM_CLIP_FUNC dmClipLineCoordsInt
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31 #define DM_COORD_TYPE int
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32 #include "dmlineclip.h"
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33
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34 #define DM_CLIP_FUNC dmClipLineCoordsFloat
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35 #define DM_COORD_TYPE DMFloat
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36 #include "dmlineclip.h"
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38
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39 #include "dmlinefunc.h"